Skunkware 98/Skunkware 98.iso/src/mail/sendmail.8.8.4.tar.gz/sendmail.8.8.4.tar/sendmail-8.8.4/RELEASE_NOTES

Text File | 1996-12-02 | 247KB | 4,982 lines

            SENDMAIL RELEASE NOTES
         @(#)RELEASE_NOTES    8.8.4.4 (Berkeley) 12/2/96


This listing shows the version of the sendmail binary, the version
of the sendmail configuration files, the date of release, and a
summary of the changes in that release.

8.8.4/8.8.4    96/12/02
    SECURITY: under some circumstances, an attacker could get additional
        permissions by hard linking to files that were group
        writable by the attacker.  The solution is to disallow any
        files that have hard links -- this will affect .forward,
        :include:, and output files.  Problem noted by Terry
        Kyriacopoulos of Interlog Internet Services.  As a
        workaround, set UnsafeGroupWrites -- always a good idea.
    SECURITY: the TryNullMXList (w) option should not be safe -- if it
        is, it is possible to do a denial-of-service attack on
        MX hosts that rely on the use of the null MX list.  There
        is no danger if you have this option turned off (the default).
        Problem noted by Dan Bernstein.  Also, make the DontInitGroups
        unsafe.  I know of no specific attack against this, although
        a denial-of-service attack is probably possible, but in theory
        you should not be able to safely tweak anything that affects
        the permissions that are used when mail is delivered.
    Purgestat could go into an infinite loop if one of the host status
        directories somehow became empty.  Problem noted by Roy
        Mongiovi of Georgia Tech.
    Processes got "lost" when counting children due to a race condition.
        This caused "proc_list_probe: lost pid" messages to be logged.
        Problem noted by several people.
    On systems with System V SIGCLD child signal semantics (notably AIX
        and HP-UX), mail transactions would print the message "451
        SMTP-MAIL: lost child: No child processes".  Problem noted
        by several people.
    Miscellaneous compiler warnings on picky compilers (or when setting
        gcc to high warning levels).  From Tom Moore of NCR Corp.
    SMTP protocol errors, and most errors on MAIL FROM: lines should
        not be persistent between runs, since they are based on the
        message rather than the host.  Problem noted by Matt Dillon
        of Best Internet Communications.
    The F=7 flag was ignored on SMTP mailers.  Problem noted by Tom Moore
        of NCR (a.k.a., AT&T Global Information Solutions).
    Avoid the possibility of having a child daemon run to completion
        (including closing the SMTP socket) before the parent has
        had a chance to close the socket; this can cause the parent
        to hang for a long time waiting for the socket to drain.
        Patch from Don Lewis of TDK Semiconductor.
    If the fork() failed in a queue run, the queue runners would not be
        rescheduled (so queue runs would stop).  Patch from Don Lewis.
    Some error conditions in ETRN could cause output without an SMTP
        status code.  Problem noted by Don Lewis.
    Multiple :maildrop addresses in the user database didn't work properly.
        Patch from Roy Mongiovi of Georgia Tech.
    Add ".db" automatically onto any user database spec that does not
        already have it; this is for consistency with makemap, the
        K line, and the documentation.  Inconsistency pointed out
        by Roy Mongiovi.
    Allow sendmail to be properly called in nohup mode.  Patch from
        Kyle Jones of UUNET.
    Change ETRN to ignore but still update host status files; previously
        it would ignore them and not save the updated status, which
        caused stale information to be maintained.  Based on a patch
        from Christopher Davis of Kapor Enterprises Inc.  Also, have
        ETRN ignore the MinQueueAge option.
    Patch long term host status to recover more gracefully from an empty
        host status file condition.  Patch from NAKAMURA Motonori
        of Kyoto University.
    Several patches to signal handling code to fix potential race
        conditions from Don Lewis.
    Make it possible to compile with -DDAEMON=0 (previously it had some
        compile errors).  This turns DAEMON, QUEUE, and SMTP into
        0/1 compilation flags.  Note that DAEMON is an obsolete
        compile flag; use NETINET instead.  Solution based on a
        patch from Bryan Costales.
    PORTABILITY FIXES:
        AIX4: getpwnam() and getpwuid() do a sequential scan of the
            /etc/security/passwd file when called as root.  This
            is very slow on some systems.  To speed it up, use the
            (undocumented) _getpw{nam,uid}_shadow() routines.
            Patch from Chris Thomas of UCLA/OAC Systems Group.
        SCO 5.x: include -lprot in the Makefile.  Patch from Bill
            Glicker of Burrelle's Information Service.
        NEWS-OS 4.x: need a definition for MODE_T to compile.  Patch
            from Makoto MATSUSHITA of Osaka University.
        SunOS 4.0.3: compile problems.  Patches from Andrew Cole of
            Leeds University and SASABE Tetsuro of the University
            of Tokyo.
        DG/UX 5.4.4.11 from Brian J. Murrell of InterLinx Support
            Services, Inc.
        Domain/OS from Don (Truck) Lewis of TDK Semiconductor Corp.
            I believe this to have only been a problem if you
            compiled with -DUSE_VENDOR_CF_PATH -- another reason
            to stick with /etc/sendmail.cf as your One True Path.
        Digital UNIX (OSF/1 on Alpha) load average computation from
            Martin Laubach of the Technischen UniversitΣt Wien.
    CONFIG: change default Received: line to be multiple lines rather
        than one long one.  By popular demand.
    MAIL.LOCAL: warnings weren't being logged on some systems.  Patch
        from Jerome Berkman of U.C. Berkeley.
    MAKEMAP: be sure to zero hinfo to avoid cruft that can cause runs
        to take a very long time.  Problem noted by Yoshiro YONEYA
        of NTT Software Corporation.
    CONTRIB: add etrn.pl, contributed by John Beck.
    NEW FILES:
        contrib/etrn.pl

8.8.3/8.8.3    96/11/17
    SECURITY: it was possible to get a root shell by lying to sendmail
        about argv[0] and then sending it a signal.  Problem noted
        by Leshka Zakharoff <[e-mail]> on the
        best-of-security list.
    Log sendmail binary version number in "Warning: .cf version level
        (%d) exceeds program functionality (%d) message" -- this
        should make it clearer to people that they are running
        the wrong binary.
    Fix a problem that occurs when you open an SMTP connection and then
        do one or more ETRN commands followed by a MAIL command; at
        the end of the DATA phase sendmail would incorrectly report
        "451 SMTP-MAIL: lost child: No child processes".  Problem
        noted by Eric Bishop of Virginia Tech.
    When doing text-based host canonification (typically /etc/hosts
        lookup), a null host name would match any /etc/hosts entry
        with space at the end of the line.  Problem noted by Steve
        Hubert of the University of Washington, Seattle.
    7 to 8 bit BASE64 MIME conversions could duplicate bits of text.
        Problem reported by Tom Smith of Digital Equipment Corp.
    Increase the size of the DNS answer buffer -- the standard UDP packet
        size PACKETSZ (512) is not sufficient for some nameserver
        answers containing very many resource records.  The resolver
        may also switch to TCP and retry if it detects UDP packet
        overflow.  Also, allow for the fact that the resolver
        routines res_query and res_search return the size of the
        *un*truncated answer in case the supplied answer buffer it
        not big enough to accommodate the entire answer.  Patch from
        Eric Wassenaar.
    Improvements to MaxDaemonChildren code.  If you think you have too
        many children, probe the ones you have to verify that they
        are still around.  Suggested by Jared Mauch of CICnet, Inc.
        Also, do this probe before growing the vector of children
        pids; this previously caused the vector to grow indefinitely
        due to a race condition.  Problem reported by Kyle Jones of
        UUNET.
    On some architectures, <db.h> (from the Berkeley DB library) defines
        O_EXLOCK to zero; this fools the map compilation code into
        thinking that it can avoid race conditions by locking on open.
        Change it to check for O_EXLOCK non-zero.  Problem noted by
        Leif Erlingsson of Data Lege.
    Always call res_init() on startup (if compiled in, of course) to
        allow the sendmail.cf file to tweak resolver flags; without
        it, flag tweaks in ResolverOptions are ignored.  Patch from
        Andrew Sun of Merrill Lynch.
    Improvements to host status printing code.  Suggested by Steve Hubert
        of the University of Washington, Seattle.
    Change MinQueueAge option processing to do the check for the job age
        when reading the queue file, rather than at the end; this
        avoids parsing the addresses, which can do DNS lookups.
        Problem noted by John Beck of InReference, Inc.
    When MIME was being 7->8 bit decoded, "From " lines weren't being
        properly escaped.  Problem noted by Peter Nilsson of the
        University of Linkoping.
    In some cases, sendmail would retain root permissions during queue
        runs even if RunAsUser was set.  Problem noted by Mark
        Thomas of Mark G. Thomas Consulting.
    If the F=l flag was set on an SMTP mailer to indicate that it is
        actually local delivery, and NOTIFY=SUCCESS is specified in
        the envelope, and the receiving SMTP server speaks DSN, then
        the DSN would be both generated locally and propogated to the
        other end.
    The U= mailer field didn't correctly extract the group id if the
        user id was numeric.  Problem noted by Kenneth Herron of
        MCI Telecommunications Communications.
    If a message exceeded the fixed maximum size on input, the body of
        the message was included in the bounce.  Note that this did
        not occur if it exceeded the maximum _output_ size.  Problem
        reported by Kyle Jones of UUNET.
    PORTABILITY FIXES:
        AIX4: 4.1 does't have a working setreuid(2); change the
            AIX4 defines to use seteuid(2) instead, which
            works on 4.1 as well as 4.2.  Problem noted by
            Hσkan Lindholm of interAF, Sweden.
        AIX4: use tzname[] vector to determine time zone name.
            Patch from NAKAMURA Motonori of Kyoto University.
        MkLinux: add Makefile.Linux.ppc and OSTYPE(mklinux) support.
            Contributed by Paul DuBois <[e-mail]>.
        Solaris: kstat(3k) support for retrieving the load average.
            This adds the LA_KSTAT definition for LA_TYPE.
            The outline of the implementation was contributed
            by Michael Tokarev of Telecom Service, JSC, Moscow.
        HP-UX 10.0 gripes about the (perfectly legal!) forward
            declaration of struct rusage at the top of conf.h;
            change it to only be included if you are using gcc,
            which is apparently the only compiler that requires
            it in the first place.  Problem noted by Jeff
            Earickson of Colby College.
        IRIX: don't default to using gcc.  IRIX is a civilized
            operating system that comes with a decent compiler
            by default.  Problem noted by Barry Bouwsma and
            Kari Hurtta.
    CONFIG: specify F=9 as default in FEATURE(local_procmail) for
        consistency with other local mailers.  Inconsistency
        pointed out by Teddy Hogeborn <[e-mail]>.
    CONFIG: if the "limited best mx" feature is used (to reduce DNS
        overhead) as part of the bestmx_is_local feature, the
        domain part was dropped from the name.  Patch from Steve
        Hubert of the University of Washington, Seattle.
    CONFIG: catch addresses of the form "user@.dom.ain"; these could
        end up being translated to the null host name, which would
        return any entry in /etc/hosts that had a space at the end
        of the line.  Problem noted by Steve Hubert of the
        University of Washington, Seattle.
    CONFIG: add OSTYPE(aix4).  From Michael Sofka of Rensselaer
        Polytechnic Institute.
    MAKEMAP: tweak hash and btree parameters for better performance.
        Patch from Matt Dillon of Best Internet Communications.
    NEW FILES:
        src/Makefiles/Makefile.Linux.ppc
        cf/ostype/aix4.m4
        cf/ostype/mklinux.m4

8.8.2/8.8.2    96/10/18
    SECURITY: fix a botch in the 7-bit MIME patch; the previous patch
        changed the code but didn't fix the problem.
    PORTABILITY FIXES:
        Solaris: Don't use the system getusershell(3); it can
            apparently corrupt the heap in some circumstances.
            Problem found by Ken Pizzini of Spry, Inc.
    OP.ME: document several mailer flags that were accidently omitted
        from this document.  These flags were F=d, F=j, F=R, and F=9.
    CONFIG: no changes.

8.8.1/8.8.1    96/10/17
    SECURITY: unset all environment variables that the resolver will
        examine during queue runs and daemon mode.  Problem noted
        by Dan Bernstein of the University of Illinois at Chicago.
    SECURITY: in some cases an illegal 7-bit MIME-encoded text/plain
        message could overflow a buffer if it was converted back
        to 8 bits.  This caused core dumps and has the potential
        for a remote attack.  Problem first noted by Gregory Shapiro
        of WPI.
    Avoid duplicate deliveries of error messages on systems that don't
        have flock(2) support.  Patch from Motonori Nakamura of
        Kyoto University.
    Ignore null FallBackMX (V) options.  If this option is null (as
        opposed to undefined) it can cause "null signature" syserrs
        on illegal host names.
    If a Base64 encoded text/plain message has no trailing newline in
        the encoded text, conversion back to 8 bits will drop the
        final line.  Problem noted by Pierre David.
    If running with a RunAsUser, sendmail would give bogus "cannot
        setuid" (or seteuid, or setreuid) messages on some systems.
        Problem pointed out by Jordan Mendelson of Web Services, Inc.
    Always print error messages in -bv mode -- previously, -bv would
        be absolutely silent on errors if the error mode was sent
        to (say) mail-back.  Problem noted by Kyle Jones of UUNET.
    If -qI/R/S is set (or the ETRN command is used), ignore all long
        term host status.  This is necessary because it is common
        to do this when you know a host has just come back up.
    Disallow duplicate HELO/EHLO commands as required by RFC 1651 section
        4.2.  Excessive permissiveness noted by Lee Flight of the
        University of Leicester.
    If a service (such as NIS) is specified as the last entry in the
        service switch, but that service is not compiled in, sendmail
        would return a temporary failure when an entry was not found
        in the map.  This caused the message to be queued instead of
        bouncing immediately.  Problem noted by Harry Edmon of the
        University of Washington.
    PORTABILITY FIXES:
        Solaris 2.3 had compilation problems in conf.c.  Several
            people pointed this out.
        NetBSD from Charles Hannum of MIT.
        AIX4 improvements based on info from Steve Bauer of South
            Dakota School of Mines & Technology.
    CONFIG: ``error:code message'' syntax was broken in virtusertable.
        Patch from Gil Kloepfer Jr.
    CONFIG: if FEATURE(nocanonify) was specified, hosts in $=M (set
        using MASQUERADE_DOMAIN) were not masqueraded unless they
        were also in $=w.  Problem noted by Zoltan Basti of
        Softec.
    MAIL.LOCAL: patches to compile and link cleanly on AIX.  Based
        on a patch from Eric Hagberg of Morgan Stanley.
    MAIL.LOCAL: patches to compile on NEXTSTEP.  From Patrick Nolan
        of Stanford via Robert La Ferla.

8.8.0/8.8.0    96/09/26
    Under some circumstances, Bcc: headers would not be properly
        deleted.  Pointed out by Jonathan Kamens of OpenVision.
    Log a warning if the sendmail daemon is invoked without a full
        pathname, which prevents "kill -1" from working.  I was
        urged to put this in by Andrey A. Chernov of DEMOS (Russia).
    Fix small buffer overflow.  Since the data in this buffer was not
        read externally, there was no security problem (and in fact
        probably wouldn't really overflow on most compilers).  Pointed
        out by KIZU takashi of Osaka University.
    Fix problem causing domain literals such as [1.2.3.4] to be ignored
        if a FallbackMXHost was specified in the configuration file
        -- all mail would be sent to the fallback even if the original
        host was accessible.  Pointed out by Munenari Hirayama of
        NSC (Japan).
    A message that didn't terminate with a newline would (sometimes) not
        have the trailing "." added properly in the SMTP dialogue,
        causing SMTP to hang.  Patch from Per Hedeland of Ericsson.
    The DaemonPortOptions suboption to bind to a particular address was
        incorrect and nonfunctional due to a misunderstanding of the
        semantics of binding on a passive socket.  Patch from
        NIIBE Yutaka of Mitsubishi Research Institute.
    Increase the number of MX hosts for a single name to 100 to better
        handle the truly huge service providers such as AOL, which
        has 13 at the moment (and climbing).  In order to avoid
        trashing memory, the buffer for all names has only been
        slightly increased in size, to 12.8K from 10.2K -- this means
        that if a single name had 100 MX records, the average size
        of those records could not exceed 128 bytes.  Requested by
        Brad Knowles of America On Line.
    Restore use of IDENT returns where the OSTYPE field equals "OTHER".
        Urged by Dan Bernstein of U.C. Berkeley.
    Print q_statdate and q_specificity in address structure debugging
        printout.
    Expand MCI structure flag bits for debugging output.
    Support IPv6-style domain literals, which can have colons between
        square braces.
    Log open file descriptors for the "cannot dup" messages in deliver();
        this is an attempt to track down a bug that one person seems
        to be having (it may be a Solaris bug!).
    DSN NOTIFY parameters were not properly propogated across queue runs;
        this caused the NOTIFY info to sometimes be lost.  Problem
        pointed out by Claus Assmann of the
        Christian-Albrechts-University of Kiel.
    The statistics gathered in the sendmail.st file were too high; in
        some cases failures (e.g., user unknown or temporary failure)
        would count as a delivery as far as the statistics were
        concerned.  Problem noted by Tom Moore of AT&T GIS.
    Systems that don't have flock() would not send split envelopes in
        the initial run.  Problem pointed out by Leonard Zubkoff of
        Dandelion Digital.
    Move buffer overflow checking -- these primarily involve distrusting
        results that may come from NIS and DNS.
    4.4-BSD-derived systems, including FreeBSD, NetBSD, and BSD/OS didn't
        include <paths.h> and hence had the wrong pathnames for a few
        things like /var/tmp.  Reported by Matthew Green.
    Conditions were reversed for the Priority: header, resulting in all
        values being interpreted as non-urgent except for non-urgent,
        which was interpreted as normal.  Patch from Bryan Costales.
    The -o (optional) flag was being ignored on hash and btree maps
        since 8.7.2.  Fix from Bryan Costales.
    Content-Types listed in class "q" will always be encoded as
        Quoted-Printable (or more accurately, will never be encoded
        as base64).  The class can have primary types (e.g., "text")
        or full types (e.g., "text/plain").  Based on a suggestion by
        Marius Olafsson of the University of Iceland.
    Define ${envid} to be the original envelope id (from the ESMTP DSN
        dialogue) so it can be passed to programs in mailers.
    Define ${bodytype} to be the body type (from the -B flag or the
        BODY= ESMTP parameter) so it can be passed to programs in
        mailers.
    Cause the VRFY command to return 252 instead of 250 unless the F=q
        flag is set in the mailer descriptor.  Suggested by John
        Myers of CMU.
    Implement ESMTP ETRN command to flush the queue for a specific host.
        The command takes a host name; data for that host is
        immediately (and asynchronously) flushed.  Because this shares
        the -qR implementation, other hosts may be attempted, but
        there should be no security implications.  Implementation
        from John Beck of InReference, Inc.  See RFC 1985 for details.
    Add three new command line flags to pass in DSN parameters: -V envid
        (equivalent to ENVID=envid on the MAIL command), -R ret
        (equivalent to RET=ret on the MAIL command), and -Nnotify
        (equivalent to NOTIFY=notify on the RCPT command).  Note
        that the -N flag applies to all recipients; there is no way
        to specify per-address notifications on the command line,
        nor is there an equivalent for the ORCPT= per-address
        parameter.
    Restore LogLevel option to be safe (it can only be increased);
        apparently I went into paranoid mode between 8.6 and 8.7
        and made it unsafe.  Pointed out by Dabe Murphy of the
        University of Maryland.
    New logging on log level 15:  all SMTP traffic.  Patches from
        Andrew Gross of San Diego Supercomputer Center.
    NetInfo property value searching code wasn't stopping when it found
        a match.  This was causing the wrong values to be found (and
        had a memory leak).  Found by Bastian Schleuter of TU-Berlin.
    Add new F=0 (zero) mailer flag to turn off MX lookups.  It was pointed
        out by Bill Wisner of Electronics for Imaging that you can't
        use the bracket address form for the MAIL_HUB macro, since
        that causes the brackets to remain in the envelope recipient
        address used for delivery.  The simple fix (stripping off the
        brackets in the config file) breaks the use of IP literal
        addresses.  This flag will solve that problem.
    Add MustQuoteChars option.  This is a list of characters that must
        be quoted if they are found in the phrase part of an address
        (that is, the full name part).  The characters @,;:\()[] are
        always in this list and cannot be removed.  The default is
        this list plus . and ' to match RFC 822.
    Add AllowBogusHELO option; if set, sendmail will allow HELO commands
        that do not include a host name for back compatibility with
        some stupid SMTP clients.  Setting this violates RFC 1123
        section 5.2.5.
    Add MaxDaemonChildren option; if this is set, sendmail will start
        rejecting connections if it has more than this many
        outstanding children accepting mail.  Note that you may
        see more processes than this because of outgoing mail; this
        is for incoming connections only.
    Add ConnectionRateThrottle option.  If set to a positive value, the
        number of incoming SMTP connections that will be permitted
        in a single second is limited to this number.  Connections are
        not refused during this time, just deferred.  The intent is to
        flatten out demand so that load average limiting can kick in.
        It is less radical than MaxDaemonChildren, which will stop
        accepting connections even if all the connections are idle
        (e.g., due to connection caching).
    Add Timeout.hoststatus option.  This interval (defaulting to 30m)
        specifies how long cached information about the state of a
        host will be kept before they are considered stale and the
        host is retried.  If you are using persistent host status
        (i.e., the HostStatusDirectory option is set) this will apply
        between runs; otherwise, it applies only within a single queue
        run and hence is useful only for hosts that have large queues
        that take a very long time to run.
    Add SingleLineFromHeader option.  If set, From: headers are coerced
        into being a single line even if they had newlines in them
        when read.  This is to get around a botch in Lotus Notes.
    Text class maps were totally broken -- if you ever retrieved the last
        item in a table it would be truncated.  Problem noted by
        Gregory Neil Shapiro of WPI.
    Extend the lines printed by the mailq command (== the -bp flag) when
        -v is given to 120 characters; this allows more information
        to be displayed.  Suggested by Gregory Neil Shapiro of WPI.
    Allow macro definitions (`D' lines) with unquoted commas; previously
        this was treated as end-of-input.  Problem noted by Bryan
        Costales.
    The RET= envelope parameter (used for DSNs) wasn't properly written
        to the queue file.  Fix from John Hughes of Atlantic
        Technologies, Inc.
    Close /var/tmp/dead.letter after a successful write -- otherwise
        if this happens in a queue run it can cause nasty delays.
        Problem noted by Mark Horton of AT&T.
    If userdb entries pointed to userdb entries, and there were multiple
        values for a given key, the database cursor would get
        trashed by the recursive call.  Problem noted by Roy Mongiovi
        of Georgia Tech.  Fixed by reading all the values and creating
        a comma-separated list; thus, the -v output will be somewhat
        different for this case.
    Fix buffer allocation problem with Hesiod-based userdb maps when
        HES_GETMAILHOST is defined.  Based on a patch by Betty Lee
        of Stanford University.
    When envelopes were split due to aliases with owner- aliases, and
        there was some error on one of the lists, more than one of
        the owners would get the message.  Problem pointed out by
        Roy Mongiovi of Georgia Tech.
    Detect excessive recursion in macro expansions, e.g., $X defined
        in terms of $Y which is defined in terms of $X.  Problem
        noted by Bryan Costales; patch from Eric Wassenaar.
    When using F=U to get "ugly UUCP" From_ lines, a buffer could in
        some cases get trashed causing bogus From_ lines.  Fix from
        Kyle Jones of UUNET.
    When doing load average initialization, if the nlist call for avenrun
        failed, the second and subsequent lookups wouldn't notice
        that fact causing bogus load averages to be returned.  Noted
        by Casper Dik of Sun Holland.
    Fix problem with incompatibility with some versions of inet_aton that
        have changed the return value to unsigned, so a check for an
        error return of -1 doesn't work.  Use INADDR_NONE instead.
        This could cause mail to addresses such as [foo.com] to bounce
        or get dropped.  Problem noted by Christophe Wolfhugel of the
        Pasteur Institute.
    DSNs were inconsistent if a failure occured during the DATA phase
        rather than the RCPT phase: the Action: would be correct, but
        the detailed status information would be wrong.  Problem noted
        by Bob Snyder of General Electric Company.
    Add -U command line flag and the XUSR ESMTP extension, both indicating
        that this is the initial MUA->MTA submission.  The flag current
        does nothing, but in future releases (when MUAs start using
        these flags) it will probably turn on things like DNS
        canonification.
    Default end-of-line string (E= specification on mailer [M] lines)
        to \r\n on SMTP mailers.  Default remains \n on non-SMTP
        mailers.
    Change the internal definition for the *file* and *include* mailers
        to have $u in the argument vectors so that they aren't
        misinterpreted as SMTP mailers and thus use \r\n line
        termination.  This will affect anyone who has redefined
        either of these in their configuration file.
    Don't assume that IDENT servers close the connection after a query;
        responses can be newline terminated.  From Terry Kennedy of
        St. Peter's College.
    Avoid core dumps on erroneous configuration files that have
        $#mailer with nothing following.  From Bryan Costales.
    Avoid null pointer dereference with high debug values in unlockqueue.
        Fix from Randy Martin of Clemson University.
    Fix possible buffer overrun when expanding very large macros.  Fix
        from Kyle Jones of UUNET.
    After 25 EXPN or VRFY commands, start pausing for a second before
        processing each one.  This avoids a certain form of denial
        of service attack.  Potential attack pointed out by Bryan
        Costales.
    Allow new named (not numbered!) config file rules to do validity
        checking on SMTP arguments: check_mail for MAIL commands and
        check_rcpt for RCPT commands.  These rulesets can do anything
        they want; their result is ignored unless they resolve to the
        $#error mailer, in which case the indicated message is printed
        and the command is rejected.  Similarly, the check_compat
        ruleset is called before delivery with "from_addr $| to_addr"
        (the $| is a meta-symbol used to separate the two addresses);
        it can give a "this sender can't send to this recipient"
        notification.  Note that this patch allows $| to stand alone
        in rulesets.
    Define new macros ${client_name}, ${client_addr}, and ${client_port}
        that have the name, IP address, and port number (respectively)
        of the SMTP client (that is, the entity at the other end of
        the connection.  These can be used in (e.g.) check_rcpt to
        verify that someone isn't trying to relay mail through your
        host inappropriately.  Be sure to use the deferred evaluation
        form, for example $&{client_name}, to avoid having these bound
        when sendmail reads the configuration file.
    Add new config file rule check_relay to check the incoming connection
        information.  Like check_compat, it is passed the host name
        and host address separated by $| and can reject connections
        on that basis.
    Allow IDA-style recursive function calls.  Code contributed by Mark
        Lovell and Paul Vixie.
    Eliminate the "No ! in UUCP From address!" message" -- instead, create
        a virtual UUCP address using either a domain address or the $k
        macro.  Based on code contributed by Mark Lovell and Paul
        Vixie.
    Add Stanford LDAP map.  Requires special libraries that are not
        included with sendmail.  Contributed by Booker C. Bense
        <[e-mail]>; contact him for support.
        See also the src/READ_ME file.
    Allow -dANSI to turn on ANSI escape sequences in debug output; this
        puts metasymbols (e.g., $+) in reverse video.  Really useful
        only for debugging deep bits of code where it is important to
        distinguish between the single-character metasymbol $+ and the
        two characters $, +.
    Changed ruleset 89 (executed in dumpstate()) to a named ruleset,
        debug_dumpstate.
    Add new UnsafeGroupWrites option; if set, .forward and :include:
        files that are group writable are considered "unsafe" -- that
        is, programs and files referenced from such files are not
        valid recipients.
    Delete bogosity test for FallBackMX host; this prevented it to be a
        name that was not in DNS or was a domain-literal.  Problem
        noted by Tom May.
    Change the introduction to error messages to more clearly delineate
        permanent from temporary failures; if both existed in a
        single message it could be confusing.  Suggested by John
        Beck of InReference, Inc.
    The IngoreDot (i) option didn't work for lines that were terminated
        with CRLF.  Problem noted by Ted Stockwell of Secure
        Computing Corporation.
    Add a heuristic to improve the handling of unbalanced `<' signs in
        message headers.  Problem reported by Matt Dillon of Best
        Internet Communications.
    Check for bogus characters in the 0200-0237 range; since these are
        used internally, very strange errors can occur if those
        characters appear in headers.  Problem noted by Anders Gertz
        of Lysator.
    Implement 7 -> 8 bit MIME conversions.  This only takes place if the
        recipient mailer has the F=9 flag set, and only works on
        text/plain body types.  Code contributed by Marius Olafsson
        of the University of Iceland.
    Special case "postmaster" name so that it is always treated as lower
        case in alias files regardless of configuration settings;
        this prevents some potential problems where "Postmaster" or
        "POSTMASTER" might not match "postmaster".  In most cases
        this change is a no-op.
    The -o map flag was ignored for text maps.  Problem noted by Bryan
        Costales.
    The -a map flag was ignored for dequote maps.  Problem noted by
        Bryan Costales.
    Fix core dump when a lookup of a class "prog" map returns no
        response.  Patch from Bryan Costales.
    Log instances where sendmail is deferring or rejecting connections
        on LogLevel 14.  Suggested by Kyle Jones of UUNET.
    Include port number in process title for network daemons.  Suggested
        by Kyle Jones of UUNET.
    Send ``double bounces'' (errors that occur when sending an error
        message) to the address indicated in the DoubleBounceAddress
        option (default: postmaster).  Previously they were always
        sent to postmaster.  Suggested by Kyle Jones of UUNET.
    Add new mode, -bD, that acts like -bd in all respects except that
        it runs in foreground.  This is useful for using with a
        wrapper that "watches" system services.  Suggested by Kyle
        Jones of UUNET.
    Fix botch in spacing around (parenthesized) comments in addresses
        when the comment comes before the address.  Patch from
        Motonori Nakamura of Kyoto University.
    Use the prefix "Postmaster notify" on the Subject: lines of messages
        that are being bounced to postmaster, rather than "Returned
        mail".  This permits the person who is postmaster more
        easily determine what messages are to their role as
        postmaster versus bounces to mail they actually sent.  Based
        on a suggestion by Motonori Nakamura.
    Add new value "time" for QueueSortOrder option; this causes the queue
        to be sorted strictly by the time of submission.  Note that
        this can cause very bad behaviour over slow lines (because
        large jobs will tend to delay small jobs) and on nodes with
        heavy traffic (because old things in the queue for hosts that
        are down delay processing of new jobs).  Also, this does not
        guarantee that jobs will be delivered in submission order
        unless you also set DeliveryMode=queue.  In general, it should
        probably only be used on the command line, and only in
        conjunction with -qRhost.domain.  In fact, there are very few
        cases where it should be used at all.  Based on an
        implementation by Motonori Nakamura.
    If a map lookup in ruleset 5 returns tempfail, queue the message in
        the same manner as other rulesets.  Previously a temporary
        failure in ruleset 5 was ignored.  Patch from Booker Bense
        of Stanford University.
    Don't proceed to the next MX host if an SMTP MAIL command returns a
        5yz (permanent failure) code.  The next MX host will still be
        tried if the connection cannot be opened in the first place
        or if the MAIL command returns a 4yz (temporary failure) code.
        (It's hard to know what to do here, since neither RFC 974 nor
        RFC 1123 specify when to proceed to the next MX host.)
        Suggested by Jonathan Kamens of OpenVision, Inc.
    Add new "-t" flag for map definitions (the "K" line in the .cf file).
        This causes map lookups that get a temporary failure (e.g.,
        name server failure) to _not_ defer the delivery of the
        message.  This should only be used if your configuration file
        is prepared to do something sensible in this case.  Based on
        an idea by Gregory Shapiro of WPI.
    Fix problem finding network interface addresses.  Patch from
        Motonori Nakamura.
    Don't reject qf entries that are not owned by your effective uid if
        you are not running setuid; this makes management of certain
        kinds of firewall setups difficult.  Patch suggested by
        Eamonn Coleman of Qualcomm.
    Add persistent host status.  This keeps the information normally
        maintained within a single queue run in disk files that are
        shared between sendmail instances.  The HostStatusDirectory
        is the directory in which the information is maintained.  If
        not set, persistent host status is turned off.  If not a full
        pathname, it is relative to the queue directory.  A common
        value is ".hoststat".
        There are also two new operation modes:
          * -bh prints the status of hosts that have had recent
            connections.
          * -bH purges the host statuses.  No attempt is made to save
            recent status information.
        This feature was originally written by Paul Vixie of Vixie
        Enterprises for KJS and adapted for V8 by Mark Lovell of
        Bigrock Consulting.  Paul's funding of Mark and Mark's patience
        with my insistence that things fit cleanly into the V8
        framework is gratefully appreciated.
    New SingleThreadDelivery option (requires HostStatusDirectory to
        operate).  Avoids letting two sendmails on the local machine
        open connections to the same remote host at the same time.
        This reduces load on the other machine, but can cause mail to
        be delayed (for example, if one sendmail is delivering a huge
        message, other sendmails won't be able to send even small
        messages).  Also, it requires another file descriptor (for the
        lock file) per connection, so you may have to reduce
        ConnectionCacheSize to avoid running out of per-process
        file descriptors.  Based on the persistent host status code
        contributed by Paul Vixie and Mark Lovell.
    Allow sending to non-simple files (e.g., /dev/null) even if the
        SafeFileEnvironment option is set.  Problem noted by Bryan
        Costales.
    The -qR flag mistakenly matched flags in the "R" line of the queue
        file.  Problem noted by Bryan Costales.
    If a job was aborted using the interrupt signal (e.g., control-C from
        the keyboard), on some occasions an empty df file would be
        left around; these would collect in the queue directory.
        Problem noted by Bryan Costales.
    Change the makesendmail script to enhance the search for Makefiles
        based on release number.  For example, on SunOS 5.5.1, it will
        search for Makefile.SunOS.5.5.1, Makefile.SunOS.5.5, and then
        Makefile.SunOS.5.x (in addition to the other rules, e.g.,
        adding $arch).  Problem noted by Jason Mastaler of Atlanta
        Webmasters.
    When creating maps using "newaliases", always map the keys to lower
        case when creating the map unless the -f flag is specified on
        the map itself.  Previously this was done based on the F=u
        flag in the local mailer, which meant you could create aliases
        that you could never access.  Problem noted by Bob Wu of DEC.
    When a job was read from the queue, the bits causing notification on
        failure or delay were always set.  This caused those
        notifications to be sent even if NOTIFY=NEVER had been
        specified.  Problem noted by Steve Hubert of the University
        of Washington, Seattle.
    Add new configurable routine validate_connection (in conf.c).  This
        lets you decide if you are willing to accept traffic from
        this host.  If it returns FALSE, all SMTP commands will return
        "550 Access denied".  -DTCPWRAPPERS will include support for
        TCP wrappers; you will need to add -lwrap to the link line.
        (See src/READ_ME for details.)
    Don't include the "THIS IS A WARNING MESSAGE ONLY" banner on postmaster
        bounces.  Some people seemed to think that this could be
        confusing (even though it is true).  Suggested by Motonori
        Nakamura.
    Add new RunAsUser option; this causes sendmail to do a setuid to that
        user early in processing to avoid potential security problems.
        However, this means that all .forward and :include: files must
        be readable by that user, and on systems that don't support the
        saved uid bit properly, all files to be written must be
        writable by that user and all programs will be executed by that
        user.  It is also incompatible with the SafeFileEnvironment
        option.  In other words, it may not actually add much to
        security.  However, it should be useful on firewalls and other
        places where users don't have accounts and the aliases file is
        well constrained.
    Add Timeout.iconnect.  This is like Timeout.connect except it is used
        only on the first attempt to delivery to an address.  It could
        be set to be lower than Timeout.connect on the principle that
        the mail should go through quickly to responsive hosts; less
        responsive hosts get to wait for the next queue run.
    Fix a problem on Solaris that occassionally causes programs
        (such as vacation) to hang with their standard input connected
        to a UDP port.  It also created some signal handling problems.
        The problems turned out to be an interaction between vfork(2)
        and some of the libraries, particularly NIS/NIS+.  I am
        indebted to Tor Egge <[e-mail]> for this fix.
    Change user class map to do the same matching that actual delivery
        will do instead of just a /etc/passwd lookup.  This adds
        fuzzy matching to the user map.  Patch from Dan Oscarsson.
    The Timeout.* options are not safe -- they can be used to create a
        denial-of-service attack.  Problem noted by Christophe
        Wolfhugel.
    Don't send PostMasterCopy messages in the event of a "delayed"
        notification.  Suggested by Barry Bouwsma.
    Don't advertise "VERB" ESMTP extension if the "noexpn" privacy
        option is set, since this disables VERB mode.  Suggested
        by John Hawkinson of MIT.
    Complain if the QueueDirectory (Q) option is not set.  Problem noted
        by Motonori Nakamura of Kyoto University.
    Only queue messages on transient .forward open failures if there
        were no successful opens.  The previous behaviour caused it
        to queue even if a "fall back" .forward was found.  Problem
        noted by Ann-Kian Yeo of the Dept. of Information Systems
        and Computer Science (DISCS), NUS, Singapore.
    Don't do 8->7 bit conversions when bouncing a MIME message that
        is bouncing because of a MIME error during 8->7 bit conversion;
        the encapsulated message will bounce again, causing a loop.
        Problem noted by Steve Hubert of the University of Washington.
    Create xf (transcript) files using the TempFileMode option value
        instead of 0644.  Suggested by Ann-Kian Yeo of the
        National University of Singapore.
    Print errors if setgid/setuid/etc. fail during delivery.  This helps
        detect cases where DefaultUid is set to something that the
        system can't cope with.
    PORTABILITY FIXES:
        Support for AIX/RS 2.2.1 from Mark Whetzel of Western
            Atlas International.
        Patches for Intel Paragon OSF/1 1.3 from Leo Bicknell
            <[e-mail]>.
        On DEC OSF/1 3.2 and earlier, the MatchGECOS code would only
            work on the first recipient of a message due to a
            bug in the getpwent family.  If this is something you
            use, you can define DEC_OSF_BROKEN_GETPWENT=1 for a
            workaround.  From Maximum Entropy of Sanford C.
            Bernstein and Associates.
        FreeBSD 1.1.5.1 uname -r returns a string containing
            parentheses, which breaks makesendmail.  Reported
            by Piero Serini <[e-mail]>.
        Sequent DYNIX/ptx 4.0.2 patches from Jack Woolley of
            Systems and Computer Technology Corporation.
        Solaris 2.x: omit the UUCP grade parameter (-g flag) because
            it is system-dependent.  Problem noted by J.J. Bailey
            of Bailey Computer Consulting.
        Pyramid NILE running DC/OSx support from Earle F. Ake of
            Hassler Communication Systems Technology, Inc.
        HP-UX 10.x compile glitches, reported by Anne Brink of the
            U.S. Army and James Byrne of Harte & Lyne Limited.
        NetBSD from Matthew Green of the NetBSD crew.
        SCO 5.x from Keith Reynolds of SCO.
        IRIX 6.2 from Robert Tarrall of the University of
            Colorado and Kari Hurtta of the Finnish Meteorological
            Institute.
        UXP/DS (Fujitsu/ICL DS/90 series) support from Diego R.
            Lopez, CICA (Seville).
        NCR SVR4 MP-RAS 3.x support from Tom Moore of NCR.
        PTX 3.2.0 from Kenneth Stailey of the US Department of Labor
            Employment Standards Administration.
        Altos System V (5.3.1) from Tim Rice of Multitalents.
        Concurrent Systems Corporation Maxion from Donald R. Laster
            Jr.
        NetInfo maps (improved debugging and multi-valued aliases)
            from Adrian Steinmann of Steinmann Consulting.
        ConvexOS 11.5 (including SecureWare C2 and the Share Scheduler)
            from Eric Schnoebelen of Convex.
        Linux 2.0 mail.local patches from Horst von Brand.
        NEXTSTEP 3.x compilation from Robert La Ferla.
        NEXTSTEP 3.x code changes from Allan J. Nathanson of NeXT.
        Solaris 2.5 configuration fixes for mail.local by Jim Davis
            of the University of Arizona.
        Solaris 2.5 has a working setreuid.  Noted by David Linn of
            Vanderbilt University.
        Solaris changes for praliases, makemap, mailstats, and smrsh.
            Previously you had to add -DSOLARIS in Makefile.dist;
            this auto-detects.  Based on a patch from Randall
            Winchester of the University of Maryland.
    CONFIG: add generic-nextstep3.3.mc file.  Contributed by
        Robert La Ferla of Hot Software.
    CONFIG: allow mailertables to resolve to ``error:code message''
        (where "code" is an exit status) on domains (previously
        worked only on hosts).  Patch from Cor Bosman of Xs4all
        Foundation.
    CONFIG: hooks for IPv6-style domain literals.
    CONFIG: predefine ALIAS_FILE and change the prototype file so that
        if it is undefined the AliasFile option is never set; this
        should be transparent for most everyone.  Suggested by John
        Myers of CMU.
    CONFIG: add FEATURE(limited_masquerade).  Without this feature, any
        domain listed in $=w is masqueraded.  With it, only those
        domains listed in a MASQUERADE_DOMAIN macro are masqueraded.
    CONFIG: add FEATURE(masquerade_entire_domain).  This causes
        masquerading specified by MASQUERADE_DOMAIN to apply to all
        hosts under those domains as well as the domain headers
        themselves.  For example, if a configuration had
        MASQUERADE_DOMAIN(foo.com), then without this feature only
        foo.com would be masqueraded; with it, *.foo.com would be
        masqueraded as well.  Based on an implementation by Richard
        (Pug) Bainter of U. Texas.
    CONFIG: add FEATURE(genericstable) to do a more general rewriting of
        outgoing addresses.  Defaults to ``hash -o /etc/genericstable''.
        Keys are user names; values are outgoing mail addresses.  Yes,
        this does overlap with the user database, and figuring out
        just when to use which one may be tricky.  Based on code
        contributed by Richard (Pug) Bainter of U. Texas with updates
        from Per Hedeland of Ericsson.
    CONFIG: add FEATURE(virtusertable) to do generalized rewriting of
        incoming addresses.  Defaults to ``hash -o /etc/virtusertable''.
        Keys are either fully qualified addresses or just the host
        part (with the @ sign).  For example, a table containing:
            [e-mail]    foo-info
            [e-mail]    bar-info
            @baz.org    [e-mail]
        would send all mail destined for [e-mail] to foo-info
        (which is presumably an alias), mail addressed to [e-mail]
        to bar-info, and anything addressed to anyone at baz.org will
        be sent to [e-mail].  The names foo.com, bar.com,
        and baz.org must all be in $=w.  Based on discussions with
        a great many people.
    CONFIG: add nullclient configurations to define SMTP_MAILER_FLAGS.
        Suggested by Richard Bainter.
    CONFIG: add FAX_MAILER_ARGS to tweak the arguments passed to the
        "fax" mailer.
    CONFIG: allow mailertable entries to resolve to local:user; this
        passes the original user@host in to procmail-style local
        mailers as the "detail" information to allow them to do
        additional clever processing.  From Joe Pruett of
        Teleport Corporation.  Delivery to the original user can
        be done by specifying "local:" (with nothing after the colon).
    CONFIG: allow any context that takes "mailer:domain" to also take
        "mailer:user@domain" to force mailing to the given user;
        "local:user" can also be used to do local delivery.  This
        applies on *_RELAY and in the mailertable entries.  Based
        on a suggestion by Ribert Kiessling of Easynet.
    CONFIG: Allow FEATURE(bestmx_is_local) to take an argument that
        limits the possible domains; this reduces the number of DNS
        lookups required to support this feature.  For example,
        FEATURE(bestmx_is_local, my.site.com) limits the lookups
        to domains under my.site.com.  Code contributed by Anthony
        Thyssen <[e-mail]>.
    CONFIG: LOCAL_RULESETS introduces any locally defined rulesets,
        such as the check_rcpt ruleset.  Suggested by Gregory Shapiro
        of WPI.
    CONFIG: MAILER_DEFINITIONS introduces any mailer definitions, in the
        event you have to define local mailers.  Suggested by
        Gregory Shapiro of WPI.
    CONFIG: fix cases where a three- (or more-) stage route-addr could
        be misinterpreted as a list:...; syntax.  Based on a patch by
        Vlado Potisk <[e-mail]>.
    CONFIG: Fix masquerading of UUCP addresses when the UUCP relay is
        remotely connected.  The address host!user was being
        converted to host!user@thishost instead of host!user@uurelay.
        Problem noted by William Gianopoulos of Raytheon Company.
    CONFIG: add confTO_ICONNECT to set Timeout.iconnect.
    CONFIG: change FEATURE(redirect) message from "User not local" to
        "User has moved"; the former wording was confusing if the
        new address is still on the local host.  Based on a suggestion
        by Andreas Luik.
    CONFIG: add support in FEATURE(nullclient) for $=E (exposed users).
        However, the class is not pre-initialized to contain root.
        Suggested by Gregory Neil Shapiro.
    CONTRIB: Remove XLA code at the request of the author, Christophe
        Wolfhugel.
    CONTRIB: Add re-mqueue.pl, contributed by Paul Pomes of Qualcomm.
    MAIL.LOCAL: make it possible to compile mail.local on Solaris.  Note
        well: this produces a slightly different mailbox format (no
        Content-Length: headers), file ownerships and modes are
        different (not owned by group mail; mode 600 instead of 660),
        and the local mailer flags will have to be tweaked (make them
        match bsd4.4) in order to use this mailer.  Patches from Paul
        Hammann of the Missouri Research and Education Network.
    MAIL.LOCAL: in some cases it could return EX_OK even though there
        was a delivery error, such as if the ownership on the file
        was wrong or the mode changed between the initial stat and
        the open.  Problem reported by William Colburn of the New
        Mexico Institute of Mining and Technology.
    MAILSTATS: handle zero length files more reliably.  Patch from Bryan
        Costales.
    MAILSTATS: add man page contributed by Keith Bostic of BSDI.
    MAKEMAP: The -d flag (to allow duplicate keys) to a btree map wasn't
        honored.  Fix from Michael Scott Shappe.
    PRALIASES: add man page contributed by Keith Bostic of BSDI.
    NEW FILES:
        src/Makefiles/Makefile.AIX.2
        src/Makefiles/Makefile.IRIX.6.2
        src/Makefiles/Makefile.maxion
        src/Makefiles/Makefile.NCR.MP-RAS.3.x
        src/Makefiles/Makefile.SCO.5.x
        src/Makefiles/Makefile.UXPDSV20
        mailstats/mailstats.8
        praliases/praliases.8
        cf/cf/generic-nextstep3.3.mc
        cf/feature/genericstable.m4
        cf/feature/limited_masquerade.m4
        cf/feature/masquerade_entire_domain.m4
        cf/feature/virtusertable.m4
        cf/ostype/aix2.m4
        cf/ostype/altos.m4
        cf/ostype/maxion.m4
        cf/ostype/solaris2.ml.m4
        cf/ostype/uxpds.m4
        contrib/re-mqueue.pl
    DELETED FILES:
        src/Makefiles/Makefile.Solaris
        contrib/xla/README
        contrib/xla/xla.c
    RENAMED FILES:
        src/Makefiles/Makefile.NCR3000 =>    Makefile.NCR.MP-RAS.2.x
        src/Makefiles/Makefile.SCO.3.2v4.2 =>    Makefile.SCO.4.2
        src/Makefiles/Makefile.UXPDS =>        Makefile.UXPDSV10
        src/Makefiles/Makefile.NeXT =>        Makefile.NeXT.2.x
        src/Makefiles/Makefile.NEXTSTEP =>    Makefile.NeXT.3.x

8.7.6/8.7.3    96/09/17
    SECURITY: It is possible to force getpwuid to fail when writing the
        queue file, causing sendmail to fall back to running programs
        as the default user.  This is not exploitable from off-site.
        Workarounds include using a unique user for the DefaultUser
        (old u & g options) and using smrsh as the local shell.
    SECURITY: fix some buffer overruns; in at least one case this allows
        a local user to get root.  This is not known to be exploitable
        from off-site.  The workaround is to disable chfn(1) commands.

8.7.5/8.7.3    96/03/04
    Fix glitch in 8.7.4 when putting certain internal lines; this can
        in some case cause connections to hang or messages to have
        extra spaces in odd places.  Patch from Eric Wassenaar;
        reports from Eric Hall of Chiron Corporation, Stephen
        Hansen of Stanford University, Dean Gaudet of HotWired,
        and others.

8.7.4/8.7.3    96/02/18
    SECURITY: In some cases it was still possible for an attacker to
        insert newlines into a queue file, thus allowing access to
        any user (except root).
    CONFIG: no changes -- it is not a bug that the configuration
        version number is unchanged.

8.7.3/8.7.3    95/12/03
    Fix botch in name server timeout in RCPT code; this problem caused
        two responses in SMTP, which breaks things horribly.  Fix
        from Gregory Neil Shapiro of WPI.
    Verify that L= value on M lines cannot be negative, which could cause
        negative array subscripting.  Not a security problem since
        this has to be in the config file, but it could have caused
        core dumps.  Pointed out by Bryan Costales.
    Fix -d21 debug output for long macro names.  Pointed out by Bryan
        Costales.
    PORTABILITY FIXES:
        SCO doesn't have ftruncate.  From Bill Aten of Computerizers.
        IBM's version of arpa/nameser.h defaults to the wrong byte
            order.  Tweak it to work properly.  Based on fixes
            from Fletcher Mattox of UTexas and Betty Lee of
            Stanford University.
    CONFIG: add confHOSTS_FILE m4 variable to set HostsFile option.
        Deficiency pointed out by Bryan Costales of ICSI.

8.7.2/8.7.2    95/11/19
    REALLY fix the backslash escapes in SmtpGreetingMessage,
        OperatorChars, and UnixFromLine options.  They were not
        properly repaired in 8.7.1.
    Completely delete the Bcc: header if and only if there are other
        valid recipient headers (To:, Cc: or Apparently-To:, the
        last being a historic botch, of course).  If Bcc: is the
        only recipient header in the message, it's value is tossed,
        but the header name is kept.  The old behaviour (always keep
        the header name and toss the value) allowed primary recipients
        to see that a Bcc: went to _someone_.
    Include queue id on ``Authentication-Warning: <host>: <user> set
        sender to <addresss> using -f'' syslog messages.  Suggested
        by Kari Hurtta.
    If a sequence or switch map lookup entry gets a tempfail but then
        continues on to another map type, but the name is not found,
        return a temporary failure from the sequence or switch map.
        For example, if hosts search ``dns files'' and DNS fails
        with a tempfail, the hosts map will go on and search files,
        but if it fails the whole thing should be a tempfail, not
        a permanent (host unknown) failure, even though that is the
        failure in the hosts.files map.  This error caused hard
        bounces when it should have requeued.
    Aliases to files such as /users/bar/foo/inbox, with /users/bar/foo
        owned by bar mode 700 and inbox being setuid bar stopped
        working properly due to excessive paranoia.  Pointed out by
        John Hawkinson of Panix.
    An SMTP RCPT command referencing a host that gave a nameserver
        timeout would return a 451 command (8.6 accepted it and
        queued it locally).  Revert to the 8.6 behaviour in order
        to simplify queue management for clustered systems.  Suggested
        by Gregory Neil Shapiro of WPI.  The same problem could break
        MH, which assumes that the SMTP session will succeed (tsk, tsk
        -- mail gets lost!); this was pointed out by Stuart Pook of
        Infobiogen.
    Fix possible buffer overflow in munchstring().  This was not a security
        problem because you couldn't specify any argument to this
        without first giving up root privileges, but it is still a
        good idea to avoid future problems.  Problem noted by John
        Hawkinson and Sam Hartman of MIT.
    ``452 Out of disk space for temp file'' messages weren't being
        printed.  Fix from David Perlin of Nanosoft.
    Don't advertise the ESMTP DSN extension if the SendMIMEErrors option
        is not set, since this is required to get the actual DSNs
        created.  Problem pointed out by John Gardiner Myers of CMU.
    Log permission problems that cause .forward and :include: files to
        be untrusted or ignored on log level 12 and higher.  Suggestted
        by Randy Martin of Clemson University.
    Allow user ids in U= clauses of M lines to have hyphens and
        underscores.
    Fix overcounting of recipients -- only happened when sending to an
        alias.  Pointed out by Mark Andrews of SGI and Jack Woolley
        of Systems and Computer Technology Corporation.
    If a message is sent to an address that fails, the error message that
        is returned could show some extraneous "success" information
        included even if the user did not request success notification,
        which was confusing.  Pointed out by Allan Johannesen of WPI.
    Config files that had no AliasFile definition were defaulting to
        using /etc/aliases; this caused problems with nullclient
        configurations.  Change it back to the 8.6 semantics of
        having no local alias file unless it is declared.  Problem
        noted by Charles Karney of Princeton University.
    Fix compile problem if NOTUNIX is defined.  Pointed out by Bryan
        Costales of ICSI.
    Map lookups of class "userdb" maps were always case sensitive; they
        should be controlled by the -f flag like other maps.  Pointed
        out by Bjart Kvarme <[e-mail]>.
    Fix problem that caused some addresses to be passed through ruleset 5
        even when they were tagged as "sticky" by prefixing the
        address with an "@".  Patch from Thomas Dwyer III of Michigan
        Technological University.
    When converting a message to Quoted-Printable, prevent any lines with
        dots alone on a line by themselves.  This is because of the
        preponderence of broken mailers that still get this wrong.
        Code contributed by Per Hedeland of Ericsson.
    Fix F{macro}/file construct -- it previously did nothing.  Pointed
        out by Bjart Kvarme of USIT/UiO (Norway).
    Announce whether a cached connection is SMTP or ESMTP (in -v mode).
        Requested by Allan Johannesen.
    Delete check for text format of alias files -- it should be legal
        to have the database format of the alias files without the
        text version.  Problem pointed out by Joe Rhett of Navigist,
        Inc.
    If "Ot" was specified with no value, the TZ variable was not properly
        imported from the environment.  Pointed out by Frank Crawford
        <[e-mail]>.
    Some architectures core dumped on "program" maps that didn't have
        extra arguments.  Patch from Booker C. Bense of Stanford
        University.
    Queue run processes would re-spawn daemons when given a SIGHUP; only
        the parent should do this.  Fix from Brian Coan of the
        Association for Progressive Communications.
    If MinQueueAge was set and a message was considered but not run
        during a queue run and the Timeout.queuereturn interval was
        reached, a "timed out" error message would be returned that
        didn't include the failed address (and claimed to be a warning
        even though it was fatal).  The fix is to not return such
        messages until they are actually tried, i.e., in the next
        MinQueueAge interval.  Problem noted by Rein Tollevik of
        SINTEF RUNIT, Oslo.
    Add HES_GETMAILHOST compile flag to support MIT Hesiod distributions
        that have the hes_getmailhost() routine.  DEC Hesiod
        distributions do not have this routine.  Based on a patch
        from Betty Lee of Stanford University.
    Extensive cleanups to map open code to handle a locking race condition
        in ndbm, hash, and btree format database files on some (most
        non-4.4-BSD based) OS architectures.  This should solve the
        occassional "user unknown" problem during alias rebuilds that
        has plagued me for quite some time.  Based on a patch from
        Thomas Dwyer III of Michigan Technological University.
    PORTABILITY FIXES:
        Solaris: Change location of newaliases and mailq from
            /usr/ucb to /usr/bin to match Sun settings.  From
            James B. Davis of TCI.
        DomainOS: Makefile.DomainOS doesn't require -ldbm.  From
            Don Lewis of Silicon Systems.
        HP-UX 10: rename Makefile.HP-UX.10 => Makefile.HP-UX.10.x
            so that the makesendmail script will find it.  Pointed
            out by Richard Allen of the University of Iceland.
            Also, use -Aa -D_HPUX_SOURCE instead of -Ae, which
            isn't supported on all compilers.
        UXPDS: compilation fixes from Diego R. Lopez.
    CONFIG: FAX mailer wasn't setting .FAX as a pseudo-domain unless
        you also had a FAX_RELAY.  From [e-mail].
    CONFIG: Minor glitch in S21 -- attachment of local domain name
        didn't have trailing dot.  From Jim Hickstein of Teradyne.
    CONFIG: Fix best_mx_is_local feature to allow nested addresses such as
        user%host@thishost.  From Claude Scarpelli of Infobiogen
        (France).
    CONFIG: OSTYPE(hpux10) failed to define the location of the help file.
        Pointed out by Hannu Martikka of Nokia Telecommunications.
    CONFIG: Diagnose some inappropriate ordering in configuration files,
        such as FEATURE(smrsh) listed after MAILER(local).  Based on
        a bug report submitted by Paul Hoffman of Proper Publishing.
    CONFIG: Make OSTYPE files consistently not override settings that
        have already been set.  Previously it worked differently
        for different files.
    CONFIG: Change relay mailer to do masquerading like 8.6 did.  My take
        is that this is wrong, but the change was causing problems
        for some people.  From Per Hedeland of Ericsson.
    CONTRIB: bitdomain.c patch from John Gardiner Myers <[e-mail]>;
        portability changes for Posix environments (no functional
        changes).

8.7.1/8.7.1    95/10/01
    Old macros that have become options (SmtpGreetingMessage,
        OperatorChars, and UnixFromLine) didn't allow backslash
        escapes in the options, where they previously had.  Bug
        pointed out by John Hawkinson of MIT.
    Fix strange case of an executable called by a program map that
        returns a value but also a non-zero exit status; this
        would give contradictory results in the higher level; in
        particular, the default clause in the map lookup would be
        ignored.  Change to ignore the value if the program returns
        non-zero exit status.  From Tom Moore of AT&T GIS.
    Shorten parameters passed to syslog() in some contexts to avoid a
        bug in many vendors' implementations of that routine.  Although
        this isn't really a bug in sendmail per se, and my solution
        has to assume that syslog() has at least a 1K buffer size
        internally (I know some vendors have shortened this
        dramatically -- they're on their own), sendmail is a popular
        target.  Also, limit the size of %s arguments in sprintf.
        These both have possible security implications.  Solutions
        suggested by Casper Dik of Sun's Network Security Group
        (Holland), Mark Seiden, and others.
    Fix a problem that might cause a non-standard -B (body type)
        parameter to be passed to the next server with undefined
        results.  This could have security implications.
    If a filesystem was at > 100% utilization, the freediskspace()
        routine incorrectly returned an error rather than zero.
        Problem noted by G. Paul Ziemba of Alantec.
    Change MX sort order so that local hostnames (those in $=w) always
        sort first within a given preference.  This forces the bestmx
        map to always return the local host first, if it is included
        in the list of highest priority MX records.  From K. Robert
        Elz.
    Avoid some possible null pointer dereferences.  Fixes from Randy
        Martin <[e-mail]>
    When sendmail starts up on systems that have no fully qualified
        domain name (FQDN) anywhere in the first matching host map
        (e.g., /etc/hosts if the hosts service searches "files dns"),
        sendmail would sleep to try to find a FQDN, which it really
        really needs.  This has been changed to fall through to the
        next map type if it can't find a FQDN -- i.e., if the hosts
        file doesn't have a FQDN, it will try dns even though the
        short name was found in /etc/hosts.  This is probably a crock,
        but many people have hosts files without FQDNs.  Remember:
        domain names are your friends.
    Log a high-priority message if you can't find your FQDN during startup.
        Suggested by Simon Barnes of Schlumberger Limited.
    When using Hesiod, initialize it early to improve error reporting.
        Patch from Don Lewis of Silicon Systems, Inc.
    Apparently at least some versions of Linux have a 90 !minute! TCP
        connection timeout in the kernel.  Add a new "connect" timeout
        to limit this time.  Defaults to zero (use whatever the
        kernel provides).  Based on code contributed by J.R. Oldroyd
        of TerraNet.
    Under some circumstances, a failed message would not be properly
        removed from the queue, causing tons of bogus error messages.
        (This fix eliminates the problematic EF_KEEPQUEUE flag.)
        Problem noted by Allan E Johannesen and Gregory Neil Shapiro
        of WPI.
    PORTABILITY FIXES:
        On IRIX 5.x, there was an inconsistency in the setting
            of sendmail.st location.  Change the Makefile to
            install it in /var/sendmail.st to match the OSTYPE
            file and SGI standards.  From Andre
            <[e-mail]>.
        Support for Fujitsu/ICL UXP/DS (For the DS/90 Series)
            from Diego R. Lopez <[e-mail]>.
        Linux compilation patches from J.R. Oldroyd of TerraNet, Inc.
        LUNA 2 Mach patches from Motonori Nakamura.
        SunOS Makefile was including -ldbm, which is for the old
            dbm library.  The ndbm library is part of libc.
    CONFIG: avoid bouncing ``user@host.'' (note trailing dot) with
        ``local configuration error'' in nullclient configuration.
        Patch from Gregory Neil Shapiro of WPI.
    CONFIG: don't allow an alias file in nullclient configurations --
        since all addresses are relayed, they give errors during
        rebuild.  Suggested by Per Hedeland of Ericsson.
    CONFIG: local mailer on Solaris 2 should always get a -f flag because
        otherwise the F=S causes the From_ line to imply that root is
        the sender.  Problem pointed out by Claude Scarpelli of
        Infobiogen (France).
    NEW FILES:
        cf/feature/use_ct_file.m4 (omitted from 8.7 by mistake)
        src/Makefiles/Makefile.KSR (omitted from 8.7 by mistake)
        src/Makefiles/Makefile.UXPDS

8.7/8.7        95/09/16
    Fix a problem that could cause sendmail to run out of file
        descriptors due to a trashed data structure after a
        vfork.  Fix from Brian Coan of the Institute for
        Global Communications.
    Change the VRFY response if you have disabled VRFY -- some
        people seemed to think that it was too rude.
    Avoid reference to uninitialized file descriptor if HASFLOCK
        was not defined.  This was used "safely" in the sense
        that it only did a stat, but it would have set the
        map modification time improperly.  Problem pointed out
        by Roy Mongiovi of Georgia Tech.
    Clean up the Subject: line on warning messages and return
        receipts so that they don't say "Returned mail:"; this
        can be confusing.
    Move ruleset entry/exit debugging from 21.2 to 21.1 -- this is
        useful enough to make it worthwhile printing on "-d".
    Avoid logging alias statistics every time you read the alias
        file on systems with no database method compiled in.
    If you have a name with a trailing dot, and you try looking it
        up using gethostbyname without the dot (for /etc/hosts
        compatibility), be sure to turn off RES_DEFNAMES and
        RES_DNSRCH to avoid finding the wrong name accidently.
        Problem noted by Charles Amos of the University of
        Maryland.
    Don't do timeouts in collect if you are not running SMTP.
        There is nothing that says you can't have a long
        running program piped into sendmail (possibly via
        /bin/mail, which just execs sendmail).  Problem reported
        by Don "Truck" Lewis of Silicon Systems.
    Try gethostbyname() even if the DNS lookup fails iff option I
        is not set.  This allows you to have hosts listed in
        NIS or /etc/hosts that are not known to DNS.  It's normally
        a bad idea, but can be useful on firewall machines.  This
        should really be broken out on a separate flag, I suppose.
    Avoid compile warnings against BIND 4.9.3, which uses function
        prototypes.  From Don Lewis of Silicon Systems.
    Avoid possible incorrect diagnosis of DNS-related errors caused
        by things like attempts to resolve uucp names using
        $[ ... $] -- the fix is to clear h_errno at appropriate
        times.  From Kyle Jones of UUNET.
    SECURITY: avoid denial-of-service attacks possible by destroying
        the alias database file by setting resource limits low.
        This involves adding two new compile-time options:
        HASSETRLIMIT (indicating that setrlimit(2) support is
        available) and HASULIMIT (indicating that ulimit(2) support
        is available -- the Release 3 form is used).  The former
        is assumed on BSD-based systems, the latter on System
        V-based systems.  Attack noted by Phil Brandenberger of
        Swarthmore University.
    New syntaxes in test (-bt) mode:
        ``.Dmvalue'' will define macro "m" to "value".
        ``.Ccvalue'' will add "value" to class "c".
        ``=Sruleset'' will dump the contents of the indicated
            ruleset.
        ``=M'' will display the known mailers.
        ``-ddebug-spec'' is equivalent to the command-line
            -d debug flag.
        ``$m'' will print the value of macro $m.
        ``$=c'' will print the contents of class $=c.
        ``/mx host'' returns the MX records for ``host''.
        ``/parse address'' will parse address, returning the value of
            crackaddr (essentially, the comment information)
            and the parsed address (the same as -bv).
        ``/try mailer address'' will rewrite address into the form
            it will have when presented to the indicated mailer.
        ``/tryflags flags'' will set flags used by parsing.  The
            flags can be `H' for header or `E' for envelope,
            and `S' for sender or `R' for recipient.  These
            can be combined, so `HR' sets flags for header
            recipients.
        ``/canon hostname'' will try to canonify hostname and
            return the result.
        ``/map mapname key'' will look up `key' in the indicated
            `mapname' and return the result.
    Somewhat better handling of UNIX-domain socket addresses -- it
        should show the pathname rather than hex bytes.
    Restore ``-ba'' mode -- this reads a file from stdin and parses
        the header for envelope sender information and uses
        CR-LF as message terminators.  It was thought to be
        obsolete (used only for Arpanet NCP protocols), but it
        turns out that the UK ``Grey Book'' protocols require
        that functionality.
    Fix a fix in previous release -- if gethostname and gethostbyname
        return a name without dots, and if an attempt to canonify
        that name fails, wait one minute and try again.  This can
        result in an extra 60 second delay on startup if your system
        hostname (as returned by hostname(1)) has no dot and no names
        listed in /etc/hosts or your NIS map have a dot.
    Check for proper domain name on HELO and EHLO commands per
        RFC 1123 section 5.2.5.  Problem noted by Thomas Dwyer III
        of Michigan Technological University.
    Relax chownsafe rules slightly -- old version said that if you
        can't tell if _POSIX_CHOWN_RESTRICTED is set (that is,
        if fpathconf returned EINVAL or ENOSYS), assume that
        chown is not safe.  The new version falls back to whether
        you are on a BSD system or not.  This is important for
        SunOS, which apparently always returns one of those
        error codes.  This impacts whether you can mail to files
        or not.
    Syntax errors such as unbalanced parentheses in the configuration
        file could be omitted if you had "Oem" prior to the
        syntax error in the config file.  Change to always print
        the error message.  It was especially weird because it
        would cause a "warning" message to be sent to the Postmaster
        for every message sent (but with no transcript).  Problem
        noted by Gregory Paris of Motorola.
    Rewrite collect and putbody to handle full 8-bit data, including
        zero bytes.  These changes are internally extensive, but
        should have minimal impact on external function.
    Allow full words for option names -- if the option letter is
        (apparently) a space, then take the word following -- e.g.,
            O MatchGECOS=TRUE
        The full list of old and new names is as follows:
            7    SevenBitInput
            8    EightBitMode
            A    AliasFile
            a    AliasWait
            B    BlankSub
            b    MinFreeBlocks/MaxMessageSize
            C    CheckpointInterval
            c    HoldExpensive
            D    AutoRebuildAliases
            d    DeliveryMode
            E    ErrorHeader
            e    ErrorMode
            f    SaveFromLine
            F    TempFileMode
            G    MatchGECOS
            H    HelpFile
            h    MaxHopCount
            i    IgnoreDots
            I    ResolverOptions
            J    ForwardPath
            j    SendMimeErrors
            k    ConnectionCacheSize
            K    ConnectionCacheTimeout
            L    LogLevel
            l    UseErrorsTo
            m    MeToo
            n    CheckAliases
            O    DaemonPortOptions
            o    OldStyleHeaders
            P    PostmasterCopy
            p    PrivacyOptions
            Q    QueueDirectory
            q    QueueFactor
            R    DontPruneRoutes
            r, T    Timeout
            S    StatusFile
            s    SuperSafe
            t    TimeZoneSpec
            u    DefaultUser
            U    UserDatabaseSpec
            V    FallbackMXhost
            v    Verbose
            w    TryNullMXList
            x    QueueLA
            X    RefuseLA
            Y    ForkEachJob
            y    RecipientFactor
            z    ClassFactor
            Z    RetryFactor
        The old macros that passed information into sendmail have
        been changed to options; those correspondences are:
            $e    SmtpGreetingMessage
            $l    UnixFromLine
            $o    OperatorChars
            $q    (deleted -- not necessary)
        To avoid possible problems with an older sendmail,
        configuration level 6 is accepted by this version of
        sendmail; any config file using the new names should
        specify "V6" in the configuration.
    Change address parsing to properly note that a phrase before a
        colon and a trailing semicolon are essentially the same
        as text outside of angle brackets (i.e., sendmail should
        treat them as comments).  This is to handle the
        ``group name: addr1, addr2, ..., addrN;'' syntax (it will
        assume that ``group name:'' is a comment on the first
        address and the ``;'' is a comment on the last address).
        This requires config file support to get right.  It does
        understand that :: is NOT this syntax, and can be turned
        off completely by setting the ColonOkInAddresses option.
    Level 6 config files added with new mailer flags:
            A    Addresses are aliasable.
            i    Do udb rewriting on envelope as well as header
            sender lines.  Applies to the from address mailer
            flags rather than the recipient mailer flags.
            j    Do udb rewriting on header recipient addresses.
            Applies to the sender mailer flags rather than the
            recipient mailer flags.
            k    Disable check for loops when doing HELO command.
            o    Always run as the mail recipient, even on local
            delivery.
            w    Check for an /etc/passwd entry for this user.
            5    Pass addresses through ruleset 5.
            :    Check for :include: on this address.
            |    Check for |program on this address.
            /    Check for /file on this address.
            @    Look up sender header addresses in the user
            database.  Applies to the mailer flags for the
            mailer corresponding to the envelope sender
            address, rather than to recipient mailer flags.
        Pre-level 6 configuration files set A, w, 5, :, |, /, and @
        on the "local" mailer, the o flag on the "prog" and "*file*"
        mailers, and the ColonOkInAddresses option.
    Eight-to-seven bit MIME conversions.  This borrows ideas from
        John Beck of Hewlett-Packard, who generously contributed
        their implementation to me, which I then didn't use (see
        mime.c for an explanation of why).  This adds the
        EightBitMode option (a.k.a. `8') and an F=8 mailer flag
        to control handling of 8-bit data.  These have to cope with
        two types of 8-bit data: unlabelled 8-bit data (that is,
        8-bit data that is entered without declaring it as 8-bit
        MIME -- technically this is illegal according to the
        specs) and labelled 8-bit data (that is, it was declared
        as 8BITMIME in the ESMTP session or by using the
        -B8BITMIME command line flag).  If the F=8 mailer flag is
        set then 8-bit data is sent to non-8BITMIME machines
        instead of converting to 7 bit (essentially using
        just-send-8 semantics).  The values for EightBitMode are:
            m    convert unlabelled 8-bit input to 8BITMIME, and do
            any necessary conversion of 8BITMIME to 7BIT
            (essentially, the full MIME option).
            p    pass unlabelled 8-bit input, but convert labelled
            8BITMIME input to 7BIT as required (default).
            s    strict adherence: reject unlabelled 8-bit input,
            convert 8BITMIME to 7BIT as required.  The F=8
            flag is ignored.
        Unlabelled 8-bit data is rejected in mode `s' regardless of
            the setting of F=8.
    Add new internal class 'n', which is the set of MIME Content-Types
        which can not be 8 to 7 bit encoded because of other
        considerations.  Types "multipart/*" and "message/*" are
        never directly encoded (although their components can be).
    Add new internal class 's', which is the set of subtypes of the
        MIME message/* content type that can be treated as though
        they are an RFC822 message.  It is predefined to have
        "rfc822".  Suggested By Kari Hurtta.
    Add new internal class 'e'.  This is the set of MIME
        Content-Transfer-Encodings that can be converted to
        a seven bit format (Quoted-Printable or Base64).  It is
        preinitialized to contain "7bit", "8bit", and "binary".
    Add C=charset mailer parameter and the the DefaultCharSet option (no
        short name) to set the default character set to use in the
        Content-Type: header when doing encoding of an 8-bit message
        which isn't marked as MIME into MIME format.  If the C=
        parameter is set on the Envelope From address, use that as
        the default encoding; else use the DefaultCharSet option.
        If neither is set, it defaults to "unknown-8bit" as
        suggested by RFC 1428 section 3.
    Allow ``U=user:group'' field in mailer definition to set a default
        user and group that a mailer will be executed as.  This
        overrides the 'u' and 'g' options, and if the `F=S' flag is
        also set, it is the uid/gid that will always be used (that
        is, the controlling address is ignored).  The values may be
        numeric or symbolic; if only a symbolic user is given (no
        group) that user's default group in the passwd file is used
        as the group.  Based on code donated by Chip Rosenthal of
        Unicom.
    Allow `u' option to also accept user:group as a value, in the same
        fashion as the U= mailer option.
    Add the symbolic time zone name in the Arpanet format dates (as
        a comment).  This adds a new compile-time configuration
        flag: TZ_TYPE can be set to TZ_TM_NAME (use the value
        of (struct tm *)->tm_name), TZ_TM_ZONE (use the value
        of (struct tm *)->tm_zone), TZ_TZNAME (use extern char
        *tzname[(struct tm *)->tm_isdst]), TZ_TIMEZONE (use
        timezone()), or TZ_NONE (don't include the comment).  Code
        from Chip Rosenthal.
    The "Timeout" option (formerly "r") is extended to allow suboptions.
        For example,
            O Timeout.helo = 2m
        There are also two new suboptions "queuereturn" and
        "queuewarn"; these subsume the old T option.  Thus, to
        set them both the preferred new syntax is
            O Timeout.queuereturn = 5d
            O Timeout.queuewarn = 4h
    Sort queue by host name instead of by message priority if the
        QueueSortOrder option (no short name) is set is set to
        ``host''.  This makes better use of the connection cache,
        but may delay more ``interactive'' messages behind large
        backlogs under some circumstances.  This is probably a
        good option if you have high speed links or don't do lots
        of ``batch'' messages, but less good if you are using
        something like PPP on a 14.4 modem.  Based on code
        contributed by Roy Mongiovi of Georgia Tech (my main
        contribution was to make it configurable).
    Save i-number of df file in qf file to simplify rebuilding of queue
        after disasterous disk crash.  Suggested by Kyle Jones of
        UUNET; closely based on code from KJS DECWRL code written
        by Paul Vixie.  NOTA BENE: The qf files produced by 8.7
        are NOT back compatible with 8.6 -- that is, you can convert
        from 8.6 to 8.7, but not the other direction.
    Add ``F=d'' mailer flag to disable all use of angle brackets in
        route-addrs in envelopes; this is because in some cases
        they can be sent to the shell, which interprets them as
        I/O redirection.
    Don't include error file (option E) with return-receipts; this
        can be confusing.
    Don't send "Warning: cannot send" messages to owner-* or
        *-request addresses.  Suggested by Christophe Wolfhugel
        of the Institut Pasteur, Paris.
    Allow -O command line flag to set long form options.
    Add "MinQueueAge" option to set the minimum time between attempts
        to run the queue.  For example, if the queue interval
        (-q value) is five minutes, but the minimum queue age
        is fifteen minutes, jobs won't be tried more often than
        once every fifteen minutes.  This can be used to give
        you more responsiveness if your delivery mode is set to
        queue-only.
    Allow "fileopen" timeout (default: 60 seconds) for opening
        :include: and .forward files.
    Add "-k", "-v", and "-z" flags to map definitions; these set the
        key field name, the value field name, and the field
        delimiter.  The field delimiter can be a single character
        or the sequence "\t" or "\n" for tab or newline.
        These are for use by NIS+ and similar access methods.
    Change maps to always strip quotes before lookups; the -q flag
        turns off this behaviour.  Suggested by Motonori Nakamura.
    Add "nisplus" map class.  Takes -k and -v flags to choose the
        key and value field names respectively.  Code donated by
        Sun Microsystems.
    Add "hesiod" map class.  The "file name" is used as the
        "HesiodNameType" parameter to hes_resolve(3).  Returns the
        first value found for the match.  Code donated by Scott
        Hutton of Indiana University.
    Add "netinfo" (NeXT NetInfo) map class.  Maps can have a -k flag to
        specify the name of the property that is searched as the
        key and a -v flag to specify the name of the property that
        is returned as the value (defaults to "members").  The
        default map is "/aliases".  Some code based on code
        contributed by Robert La Ferla of Hot Software.
    Add "text" map class.  This does slow, linear searches through
        text files.  The -z flag specifies a column delimiter
        (defaults to any sequence of white space), the -k flag
        sets the key column number, and the -v flag sets the
        value column number.  Lines beginning with `#' are treated
        as comments.
    Add "program" map class to execute arbitrary programs.  The search
        key is presented as the last argument; the output is one
        line read from the programs standard output.  Exit statuses
        are from sysexits.h.
    Add "sequence" map class -- searches maps in sequence until it
        finds a match.  For example, the declarations:
            Kmap1 ...
            Kmap2 ...
            Kmapseq sequence map1 map2
        defines a map "mapseq" that first searches map1; if the
        value is found it is returned immediately, otherwise
        map2 is searched and the value returned.
    Add "switch" map class.  This is much like "sequence" except that
        the ordering is fetched from an external file, usually
        the system service switch.  The parameter is the name of
        the service to switch on, and the maps that it will use
        are the name of the switch map followed by ".service_type".
        For example, if the declaration of the map is
            Ksample switch hosts
        and the system service switch specifies that hosts are
        looked up using dns and nis in that order, then this is
        equivalent to
            Ksample sequence sample.dns sample.nis
        The subordinate maps (sample.*) must already be defined.
    Add "user" map class -- looks up users using getpwnam.  Takes a
        "-v field" flag on the definition that tells what passwd
        entry to return -- legal values are name, passwd, uid, gid,
        gecos, dir, and shell.  Generally expected to be used with
        the -m (matchonly) flag.
    Add "bestmx" map class -- returns the best MX value for the host
        listed as the value.  If there are several "best" MX records
        for this host, one will be chosen at random.
    Add "userdb" map class -- looks up entries in the user database.
        The "file name" is actually the tag that will be used,
        typically "mailname".  If there are multiple entries
        matching the name, the one chosen is undefined.
    Add multiple queue timeouts (both return and warning).  These are
        set by the Precedence: or Priority: header fields to one of
        three values.  If a Priority: is set and has value "normal",
        "urgent", or "non-urgent" the corresponding timeouts are
        used.  If no priority is set, the Precedence: is consulted;
        if negative, non-urgent timeouts are used; if greater than
        zero, urgent timeouts are used.  Otherwise, normal timeouts
        are used.  The timeouts are set by setting the six timeouts
        queue{warn,return}.{urgent,normal,non-urgent}.
    Fix problem when a mail address is resolved to a $#error mailer
        with a temporary failure indication; it works in SMTP,
        but when delivering locally the mail is silently discarded.
        This patch, from Kyle Jones of UUNET, bounces it instead
        of queueing it (queueing is very hard).
    When using /etc/hosts or NIS-style lookups, don't assume that
        the first name in the list is the best one -- instead,
        search for the first one with a dot.  For example, if
        an /etc/hosts entry reads
            128.32.149.68    mammoth mammoth.CS.Berkeley.EDU
        this change will use the second name as the canonical
        machine name instead of the initial, unqualified name.
    Change dequote map to replace spaces in quoted text with a value
        indicated by the -s flag on the dequote map definition.
        For example, ``Mdequote dequote -s_'' will change
        "Foo Bar" into an unquoted Foo_Bar instead of leaving it
        quoted (because of the space character).  Suggested by Dan
        Oscarsson for use in X.400 addresses.
    Implement long macro names as ${name}; long class names can
        be similarly referenced as $={name} and $~{name}.
        Definitions are (e.g.) ``D{name}value''.  Names that have
        a leading lower case letter or punctuation characters are
        reserved for internal use by sendmail; i.e., config files
        should use names that begin with a capital letter.  Based
        on code contributed by Dan Oscarsson.
    Fix core dump if getgrgid returns a null group list (as opposed
        to an empty group list, that is, a pointer to a list
        with no members).  Fix from Andrew Chang of Sun Microsystems.
    Fix possible core dump if malloc fails -- if the malloc in xalloc
        failed, it called syserr which called newstr which called
        xalloc....  The newstr is now avoided for "panic" messages.
        Reported by Stuart Kemp of James Cook University.
    Improve connection cache timeouts; previously, they were not even
        checked if you were delivering to anything other than an
        IPC-connected host, so a series of (say) local mail
        deliveries could cause cached connections to be open
        much longer than the specified timeout.
    If an incoming message exceeds the maximum message size, stop
        writing the incoming bytes to the queue data file, since
        this can fill your mqueue partition -- this is a possible
        denial-of-service attack.
    Don't reject all numeric local user names unless HESIOD is
        defined.  It turns out that Posix allows all-numeric
        user names.  Fix from Tony Sanders of BSDI.
    Add service switch support.  If the local OS has a service
        switch (e.g., /etc/nsswitch.conf on Solaris or /etc/svc.conf
        on DEC systems) that will be used; otherwise, it falls back
        to using a local mechanism based on the ServiceSwitchFile
        option (default: /etc/service.switch).  For example, if the
        service switch lists "files" and "nis" for the aliases
        service, that will be the default lookup order.  the "files"
        ("local" on DEC) service type expands to any alias files
        you listed in the configuration file, even if they aren't
        actually file lookups.
    Option I (NameServerOptions) no longer sets the "UseNameServer"
        variable which tells whether or not DNS should be considered
        canonical.  This is now determined based on whether or not
        "dns" is in the service list for "hosts".
    Add preliminary support for the ESMTP "DSN" extension (Delivery
        Status Notifications).  DSN notifications override
        Return-Receipt-To: headers, which are bogus anyhow --
        support for them has been removed.
    Add T=mts-name-type/address-type/diagnostic-type keyletter to mailer
        definitions to define the types used in DSN returns for
        MTA names, addresses, and diagnostics respectively.
    Extend heuristic to force running in ESMTP mode to look for the
        five-character string "ESMTP" anywhere in the 220 greeting
        message (not just the second line).  This is to provide
        better compatibility with other ESMTP servers.
    Print sequence number of job when running the queue so you can
        easily see how much progress you have made.  Suggested
        by Peter Wemm of DIALix.
    Map newlines to spaces in logged message-ids; some versions of
        syslog truncate the rest of the line after newlines.
        Suggested by Fletcher Mattox of U. Texas.
    Move up forking for job runs so that if a message is split into
        multiple envelopes you don't get "fork storms" -- this
        also improves the connection cache utilization.
    Accept "<<>>", "<<<>>>", and so forth as equivalent to "<>" for
        the purposes of refusing to send error returns.  Suggested
        by Motonori Nakamura of Ritsumeikan University.
    Relax rules on when a file can be written when referenced from
        the aliases file: use the default uid/gid instead of the
        real uid/gid.  This allows you to create a file owned by
        and writable only by the default uid/gid that will work
        all the time (without having the setuid bit set).  Change
        suggested by Shau-Ping Lo and Andrew Cheng of Sun
        Microsystems.
    Add "DialDelay" option (no short name) to provide an "extra"
        delay for dial on demand systems.  If this is non-zero
        and a connect fails, sendmail will wait this long and
        then try again.  If it takes longer than the kernel
        timeout interval to establish the connection, this
        option can give the network software time to establish
        the link.  The default units are seconds.
    Move logging of sender information to be as early as possible;
        previously, it could be delayed a while for SMTP mail
        sent to aliases.  Suggested by Brad Knowles of the
        Defense Information Systems Agency.
    Call res_init() before setting RES_DEBUG; this is required by
        BIND 4.9.3, or so I'm told.  From Douglas Anderson of
        the National Computer Security Center.
    Add xdelay= field in logs -- this is a transaction delay, telling
        you how long it took to deliver to this address on the
        last try.  It is intended to be used for sorting mailing
        lists to favor "quick" addresses.  Provided for use by
        the mailprio scripts (see below).
    If a map cannot be opened, and that map is non-optional, and
        an address requires that map for resolution, queue the
        map instead of bouncing it.  This involves creating a
        pseudo-class of maps called "bogus-map" -- if a required
        map cannot be opened, the class is changed to bogus-map;
        all queries against bogus-map return "tempfail".  The
        bogus-map class is not directly accessible.  A sample
        implementation was donated by Jem Taylor of Glasgow
        University Computing Service.
    Fix a possible core dump when mailing to a program that talks
        SMTP on its standard input.  Fix from Keith Moore of
        the University of Kentucky.
    Make it possible to resolve filenames to $#local $: @ /filename;
        previously, the "@" would cause it to not be recognized
        as a file.  Problem noted by Brian Hill of U.C. Davis.
    Accept a -1 signal to re-exec the daemon.  This only works if
        argv[0] is a full path to sendmail.
    Fix bug in "addr=..." field in O option on little-endian machines
        -- the network number wasn't being converted to network
        byte order.  Patch from Kurt Lidl of Pix Technologies
        Corporation.
    Pre-initialize the resolver early on; this is to avoid a bug with
        BIND 4.9.3 that can cause the _res.retry field to get
        reset to zero, causing all name server lookups to time
        out.  Fix from Matt Day of Artisoft.
    Restore T line (trusted users) in config file -- but instead of
        locking out the -f flag, they just tell whether or not
        an X-Authentication-Warning: will be added.  This really
        just creates new entries in class 't', so "Ft/file/name"
        can be used to read trusted user names from a file.
        Trusted users are also allowed to execute programs even
        if they have a shell that isn't in /etc/shells.
    Improve NEWDB alias file rebuilding so it will create them
        properly if they do not already exist.  This had been
        a MAYBENEXTRELEASE feature in 8.6.9.
    Check for @:@ entry in NIS maps before starting up to avoid
        (but not prevent, sigh) race conditions.  This ought to
        be handled properly in ypserv, but isn't.  Suggested by
        Michael Beirne of Motorola.
    Refuse connections if there isn't enough space on the filesystem
        holding the queue.  Contributed by Robert Dana of Wolf
        Communications.
    Skip checking for directory permissions in the path to a file
        when checking for file permissions iff setreuid()
        succeeded -- it is unnecessary in that case.  This avoids
        significant performance problems when looking for .forward
        files.  Based on a suggestion by Win Bent of USC.
    Allow symbolic ruleset names.  Syntax can be "Sname" to get an
        arbitrary ruleset number assigned or "Sname = integer"
        to assign a specific ruleset number.  Reference is
        $>name_or_number.  Names can be composed of alphas, digits,
        underscore, or hyphen (first character must be non-numeric).
    Allow -o flag on AliasFile lines to make the alias file optional.
        From Bryan Costales of ICSI.
    Add NoRecipientAction option to handle the case where there is
        no legal recipient header in the message.  It can take
        on values:
          None            Leave the message as is.  The
                    message will be passed on even
                    though it is in technically
                    illegal syntax.
          Add-To        Add a To: header with any
                    recipients that it can find from
                    the envelope.  This risks exposing
                    Bcc: recipients.
          Add-Apparently-To    Add an Apparently-To: header.  This
                    has almost no redeeming social value,
                    and is provided only for back
                    compatibility.
          Add-To-Undisclosed    Add a header reading
                    To: undisclosed-recipients:;
                    which will have the effect of
                    making the message legal without
                    exposing Bcc: recipients.
          Add-Bcc        To add an empty Bcc: header.
                    There is a chance that mailers down
                    the line will delete this header,
                    which could cause exposure of Bcc:
                    recipients.
        The default is NoRecipientAction=None.
    Truncate (rather than delete) Bcc: lines in the header.  This
        should prevent later sendmails (at least, those that don't
        themselves delete Bcc:) from considering this message to
        be non-conforming -- although it does imply that non-blind
        recipients can see that a Bcc: was sent, albeit not to whom.
    Add SafeFileEnvironment option.  If declared, files named as delivery
        targets must be regular files in addition to the regular
        checks.  Also, if the option is non-null then it is used as
        the name of a directory that is used as a chroot(2)
        environment for the delivery; the file names listed in an
        alias or forward should include the name of this root.
        For example, if you run with
            O SafeFileEnvironment=/arch
        then aliases should reference "/arch/rest/of/path".  If a
        value is given, sendmail also won't try to save to
        /usr/tmp/dead.letter (instead it just leaves the job in the
        queue as Qfxxxxxx).  Inspired by *Hobbit*'s sendmail patch kit.
    Support -A flag for alias files; this will comma concatenate like
        entries.  For example, given the aliases:
            list: member1
            list: member2
        and an alias file declared as:
            OAhash:-A /etc/aliases
        the final alias inserted will be "list: member1,member2";
        without -A you will get an error on the second and subsequent
        alias for "list".  Contributed by Bryan Costales of ICSI.
    Line-buffer transcript file.  Suggested by Liudvikas Bukys.
    Fix a problem that could cause very long addresses to core dump in
        some special circumstances.  Problem pointed out by Allan
        Johannesen.
    (Internal change.)  Change interface to expand() (macro expansion)
        to be simpler and more consistent.
    Delete check for funny qf file names.  This didn't really give
        any extra security and caused some people some problems.
        (If you -really- want this, define PICKY_QF_NAME_CHECK
        at compile time.)  Suggested by Kyle Jones of UUNET.
    (Internal change.)  Change EF_NORETURN to EF_NO_BODY_RETN and
        merge with DSN code; this is simpler and more consistent.
        This may affect some people who have written their own
        checkcompat() routine.
    (Internal change.)  Eliminate `D' line in qf file.  The df file
        is now assumed to be the same name as the qf file (with
        the `q' changed to a `d', of course).
    Avoid forking for delivery if all recipient mailers are marked as
        "expensive" -- this can be a major cost on some systems.
        Essentially, this forces sendmail into "queue only" mode
        if all it is going to do is queue anyway.
    Avoid sending a null message in some rather unusual circumstances
        (specifically, the RCPT command returns a temporary
        failure but the connection is lost before the DATA
        command).  Fix from Scott Hammond of Secure Computing
        Corporation.
    Change makesendmail to use a somewhat more rational naming scheme:
        Makefiles and obj directories are named $os.$rel.$arch,
        where $os is the operating system (e.g., SunOS), $rel is
        the release number (e.g., 5.3), and $arch is the machine
        architecture (e.g., sun4).  Any of these can be omitted,
        and anything after the first dot in a release number can
        be replaced with "x" (e.g., SunOS.4.x.sun4).  The previous
        version used $os.$arch.$rel and was rather less general.
    Change makesendmail to do a "make depend" in the target directory
        when it is being created.  This involves adding an empty
        "depend:" entry in most Makefiles.
    Ignore IDENT return value if the OSTYPE field returns "OTHER",
        as indicated by RFC 1413.  Pointed out by Kari Hurtta
        of the Finnish Meteorological Institute.
    Fix problem that could cause multiple responses to DATA command
        on header syntax errors (e.g., lines beginning with colons).
        Problem noted by Jens Thomassen of the University of Oslo.
    Don't let null bytes in headers cause truncation of the rest of
        the header.
    Log Authentication-Warning:s.  Suggested by Motonori Nakamura.
    Increase timeouts on message data puts to allow time for receivers
        to canonify addresses in headers on the fly.  This is still
        a rather ugly heuristic.  From Motonori Nakamura.
    Add "HasWildcardMX" suboption to ResolverOptions; if set, MX
        records are not used when canonifying names, and when MX
        lookups are done for addressing they must be fully
        qualified.  This is useful if you have a wildcard MX record,
        although it may cause other problems.  In general, don't use
        wildcard MX records.  Patch from Motonori Nakamura.
    Eliminate default two-line SMTP greeting message.  Instead of
        adding an extra "ESMTP spoken here" line, the word "ESMTP"
        is added between the first and second word of the first
        line of the greeting message (i.e., immediately after the
        host name).  This eliminates the need for the BROKEN_SMTP_PEERS
        compile flag.  Old sendmails won't see the ESMTP, but that's
        acceptable because SIZE was the only useful extension that
        old sendmails understand.
    Avoid gethostbyname calls on UNIX domain sockets during SIGUSR1
        invoked state dumps.  From Masaharu Onishi.
    Allow on-line comments in .forward and :include: files; they are
        introduced by the string "<LWSP>#@#<LWSP>", where <LWSP>
        is a space or a tab.  This is intended for native
        representation of non-ASCII sets such as Japanese, where
        existing encodings would be unreadable or would lose
        data -- for example,
         <[e-mail]> NAKAMURA Motonori
                    (romanized/less information)
         <[e-mail]> =?ISO-2022-JP?B?GyRCQ2ZCPBsoQg==?=
                          =?ISO-2022-JP?B?GyRCQUdFNRsoQg==?=
                    (with MIME encoding, not human readable)
         <[e-mail]> #@# ^[$BCfB<^[(B ^[$BAGE5^[(B
                    (native encoding with ISO-2022-JP)
        The last form is human readable in the Japanese environment.
        Based on a fix from (surprise!) Motonori Nakamura.
    Don't make SMTP error returns on MAIL FROM: line be "sticky" for all
        messages to that host; these are most frequently associated
        with addresses rather than the host, with the exception of
        421 (service shutting down).  The effect was to cause queues
        to sometimes take an excessive time to flush.  Reported by
        Robert Sargent of Southern Geographics Technologies and
        Eric Prestemon of American University.
    Add Nice=N mailer option to set the niceness at which a mailer will
        run.  This is actually a relative niceness (that is, an
        increment on the background value).
    Log queue runs that are skipped due to high loads.  They are logged
        at LOG_INFO priority iff the log level is > 8.  Contributed
        by Bruce Nagel of Data General.
    Allow the error mailer to accept a DSN-style error status code
        instead of an sysexits status code in the host part.
        Anything with a dot will be interpreted as a DSN-style code.
    Add new mailer flag: F=3 will tell translations to Quoted-Printable
        to encode characters that might be munged by an EBCDIC system
        in addition to the set required by RFC 1521.  The additional
        characters are !, ", #, $, @, [, \, ], ^, `, {, |, }, and ~.
        (Think of "IBM 360" as the mnemonic for this flag.)
    Change check for mailing to files to look for a pathname of [FILE]
        rather than looking for the mailer named *file*.  The mapping
        of leading slashes still goes to the *file* mailer.  This
        allows you to implement the *file* mailer as a separate
        program, for example, to insert a Content-Length: header
        or do special security policy.  However, note that the usual
        initial checking for the file permissions is still done, and
        the program in question needs to be very careful about how
        it does the file write to avoid security problems.
    Be able to read ~root/.forward even if the path isn't accessible to
        regular users.  This is disrecommended because sendmail
        sometimes does not run as root (e.g., when an unsafe option
        is specified on the command line), but should otherwise be
        safe because .forward files must be owned by the user for
        whom mail is being forwarded, and cannot be a symbolic link.
        Suggested by Forrest Aldrich of Wang Laboratories.
    Add new "HostsFile" option that is the pathname to the /etc/hosts
        file.  This is used for canonifying hostnames when the
        service type is "files".
    Implement programs on F (read class from file) line.  The syntax is
        Fc|/path/to/program to read the output from the program
        into class "c".
    Probe the network interfaces to find alternate names for this
        host.  Requires the SIOCGIFCONF ioctl call.  Code
        contributed by SunSoft.
    Add "E" configuration line to set or propogate environment
        variables into children.  "E<envar>" will propogate
        the named variable from the environment when sendmail
        was invoked into any children it calls; "E<envar>=<value>"
        sets the named variable to the indicated value.  Any
        variables not explicitly named will not be in the child
        environment.  However, sendmail still forces an
        "AGENT=sendmail" environment variable, in part to enforce
        at least one environment variable, since many programs and
        libraries die horribly if this is not guaranteed.
    Change heuristic for rebuilding both NEWDB and NDBM versions of
        alias databases -- new algorithm looks for the substring
        "/yp/" in the file name.  This is more portable and involves
        less overhead.  Suggested by Motonori Nakamura.
    Dynamically allocate the queue work list so that you don't lose
        jobs in large queue runs.  The old QUEUESIZE compile parameter
        is replaced by QUEUESEGSIZE (the unit of allocation, which
        should not need to be changed) and the MaxQueueRunSize option,
        which is the absolute maximum number of jobs that will ever
        be handled in a single queue run.  Based on code contributed
        by Brian Coan of the Institute for Global Communications.
    Log message when a message is dropped because it exceeds the maximum
        message size.  Suggested by Leo Bicknell of Virginia Tech.
    Allow trusted users (those on a T line or in $=t) to use -bs without
        an X-Authentication-Warning: added.  Suggested by Mark Thomas
        of Mark G. Thomas Consulting.
    Announce state of compile flags on -d0.1 (-d0.10 throws in the
        OS-dependent defines).  The old semantic of -d0.1 to not
        run the daemon in background has been moved to -d99.100,
        and the old 52.5 flag (to avoid disconnect() from closing
        all output files) has been moved to 52.100.  This makes
        things more consistent (flags below .100 don't change
        semantics) and separates out the backgrounding so that
        it doesn't happen automatically on other unrelated debugging
        flags.
    If -t is used but no addresses are found in the header, give an
        error message rather than just doing nothing.  Fix from
        Motonori Nakamura.
    On systems (like SunOS) where the effective gid is not necessarily
        included in the group list returned by getgroups(), the
        `restrictmailq' option could sometimes cause an authorized
        user to not be able to use `mailq'.  Fix from Charles Hannum
        of MIT.
    Allow symbolic service names for [IPC] mailers.  Suggested by
        Gerry Magennis of Logica International.
    Add DontExpandCnames option to prevent $[ ... $] from expanding CNAMEs
        when running DNS.  For example, if the name FTP.Foo.ORG is
        a CNAME for Cruft.Foo.ORG, then when sitting on a machine in
        the Foo.ORG domain a lookup of "FTP" returns "Cruft.Foo.ORG"
        if this option is not set, or "FTP.Foo.ORG" if it is set.
        This is technically illegal under RFC 822 and 1123, but the
        IETF is moving toward legalizing it.  Note that turning on
        this option is not sufficient to guarantee that a downstream
        neighbor won't rewrite the address for you.
    Add "-m" flag to makesendmail script -- this tells you what object
        directory and Makefile it will use, but doesn't actually do
        the make.
    Do some additional checking on the contents of the qf file to try
        to detect attacks against the qf file.  In particular,
        abort on any line beginning "From ", and add an "end of
        file" line -- any data after that line is prohibited.
    Always use /etc/sendmail.cf, regardless of the arbitrary vendor
        choices.  This can be overridden in the Makefile by using
        either -DUSE_VENDOR_CF_PATH to get the vendor location
        (to the extent that we know it) or by defining
        _PATH_SENDMAILCF (which is a "hard override").  This allows
        sendmail 8 to have more consistent installation instructions.
    Allow macros on `K' line in config file.  Suggested by Andrew Chang
        of Sun Microsystems.
    Improved symbol table hash function from Eric Wassenaar.  This one
        is at least 50% faster.
    Fix problem that didn't notice that timeout on file open was a
        transient error.  Fix from Larry Parmelee of Cornell
        University.
    Allow comments (lines beginning with a `#') in files read for
        classes.  Suggested by Motonori Nakamura.
    Make SIGINT (usually ^C) in test mode return to the prompt instead
        of dropping out entirely.  This makes testing some of the
        name server lookups easier to deal with when there are
        hung servers.  From Motonori Nakamura.
    Add new ${opMode} macro that is set to the current operation mode
        (e.g., `s' for -bs, `t' for -bt, etc.).  Suggested by
        Claude Marinier <[e-mail]>.
    Add new delivery mode (Odd) that defers all map lookups to queue runs.
        Kind of like queue-only mode (Odq) except it tries to avoid
        any external service requests; for dial-on-demand hosts that
        want to minimize DNS lookups when mail is being queued.  For
        this to work you will also have to make sure that gethostbyname
        of your local host name does not do a DNS lookup.
    Improved handling of "out of space" conditions from John Myers of
        Carnegie Mellon.
    Improved security for mailing to files on systems that have fchmod(2)
        support.
    Improve "cannot send message for N days" message -- now says "could
        not send for past N days".  Suggested by Tom Moore of AT&T
        Global Information Solutions.
    Less misleading Subject: line on messages sent to postmaster only.
        From Motonori Nakamura.
    Avoid duplicate error messages on bad command line flags.  From
        Motonori Nakamura.
    Better error message for case where ruleset 0 falls off the end
        or otherwise does not resolve to a canonical triple.
    Fix a problem that could cause multiple bounce messages if a bad
        address was sent along with a good address to an SMTP
        site where that SMTP site returned a 4yz code in response
        to the final dot of the data.  Problem reported by David
        James of British Telecom.
    Add "volatile" declarations so that gcc -O2 will work.  Patches
        from Alexander Dupuy of System Management ARTS.
    Delete duplicates in MX lists -- believe it or not, there are sites
        that list the same host twice in an MX list.  This deletion
        only works on adjacent preferences, so an MX list that
        had A=5, B=10, A=15 would leave both As, but one that had
        A=5, A=10, B=15 would reduce to A, B.  This is intentional,
        just in case there is something weird I haven't thought of.
        Suggested by Barry Shein of Software Tool & Die.
    SECURITY: .forward files cannot be symbolic links.  If they are,
        a bad guy can read your private files.
    PORTABILITY FIXES:
        Solaris 2 from Rob McMahon <[e-mail]>.
        System V Release 4 from Motonori Nakamura of Ritsumeikan
            University.  This expands the disk size
            checking to include all (?) SVR4 configurations.
        System V Release 4 from Kimmo Suominen -- initgroups(3)
            and setrlimit(2) are both available.
        System V Release 4 from [e-mail] -- some versions
            apparently "have EX_OK defined in other headerfiles."
        Linux Makefile typo.
        Linux getusershell(3) is broken in Slackware 2.0 --
            from Andrew Pam of Xanadu Australia.
        More Linux tweaking from John Kennedy of California State
            University, Chico.
        Cray changes from Eric Wassenaar:  ``On Cray, shorts,
            ints, and longs are all 64 bits, and all structs
            are multiples of 64 bits.  This means that the
            sizeof operator returns only multiples of 8.
            This requires adaptation of code that really
            deals with 32 bit or 16 bit fields, such as IP
            addresses or nameserver fields.''
        DG/UX 5.4.3 from Mark T. Robinson <[e-mail]>.  To
            get the old behaviour, use -DDGUX_5_4_2.
        DG/UX hack: add _FORCE_MAIL_LOCAL_=yes environment
            variable to fix bogus /bin/mail behaviour.
        Tandem NonStop-UX from Rick McCarty <[e-mail]>.
            This also cleans up some System V Release 4 compile
            problems.
        Solaris 2: sendmail.cw file should be in /etc/mail to
            match all the other configuration files.  Fix
            from Glenn Barry of Emory University.
        Solaris 2.3: compile problem in conf.c.  Fix from Alain
            Nissen of the University of Liege, Belgium.
        Ultrix: freespace calculation was incorrect.  Fix from
            Takashi Kizu of Osaka University.
        SVR4: running in background gets a SIGTTOU because the
            emulation code doesn't realize that "getpeername"
            doesn't require reading the file.  Fix from Peter
            Wemm of DIALix.
        Solaris 2.3: due to an apparent bug in the socket emulation
            library, sockets can get into a "wedged" state where
            they just return EPROTO; closing and re-opening the
            socket clears the problem.  Fix from Bob Manson
            of Ohio State University.
        Hitachi 3050R & 3050RX running HI-UX/WE2: portability
            fixes from Akihiro Hashimoto ("Hash") of Chiba
            University.
        AIX changes to allow setproctitle to work from Rainer Sch÷pf
            of Zentrum fⁿr Datenverarbeitung der UniversitΣt
            Mainz.
        AIX changes for load average from Ed Ravin of NASA/Goddard.
        SCO Unix from Chip Rosenthal of Unicom (code was using the
            wrong statfs call).
        ANSI C fixes from Adam Glass (NetBSD project).
        Stardent Titan/ANSI C fixes from Kate Hedstrom of Rutgers
            University.
        DG-UX fixes from Bruce Nagel of Data General.
        IRIX64 updates from Mark Levinson of the University of
            Rochester Medical Center.
        Altos System V (``the first UNIX/XENIX merge the Altos
            did for their Series 1000 & Series 2000 line;
            their merged code was licenced back to AT&T and
            Microsoft and became System V release 3.2'') from
            Tim Rice <[e-mail]>.
        OSF/1 running on Intel Paragon from Jeff A. Earickson
            <[e-mail]> of Intel Scalable Systems
            Divison.
        Amdahl UTS System V 2.1.5 (SVr3-based) from Janet Jackson
            <[e-mail]>.
        System V Release 4 (statvfs semantic fix) from Alain
            Durand of I.M.A.G.
        HP-UX 10.x multiprocessor load average changes from
            Scott Hutton and Jeff Sumler of Indiana University.
        Cray CSOS from Scott Bolte of Cray Computer Corporation.
        Unicos 8.0 from Douglas K. Rand of the University of North
            Dakota, Scientific Computing Center.
        Solaris 2.4 fixes from Sanjay Dani of Dani Communications.
        ConvexOS 11.0 from Christophe Wolfhugel.
        IRIX 4.0.5 from David Ashton-Reader of CADcentre.
        ISC UNIX from J. J. Bailey.
        HP-UX 9.xx on the 8xx series machines from Remy Giraud
            of Meteo France.
        HP-UX configuration from Tom Lane <[e-mail]>.
        IRIX 5.2 and 5.3 from Kari E. Hurtta.
        FreeBSD 2.0 from Mike Hickey of Federal Data Corporation.
        Sony NEWS-OS 4.2.1R and 6.0.3 from Motonori Nakamura.
        Omron LUNA unios-b, mach from Motonori Nakamura.
        NEC EWS-UX/V 4.2 from Motonori Nakamura.
        NeXT 2.1 from Bryan Costales.
        AUX patch thanks to Mike Erwin of Apple Computer.
        HP-UX 10.0 from John Beck of Hewlett-Packard.
        Ultrix: allow -DBROKEN_RES_SEARCH=0 if you are using a
            non-DEC resolver.  Suggested by Allan Johannesen.
        UnixWare 2.0 fixes from Petr Lampa of the Technical
            University of Brno (Czech Republic).
        KSR OS 1.2.2 support from Todd Miller of the University
            of Colorado.
        UX4800 support from Kazuhisa Shimizu of NEC.
    MAKEMAP: allow -d flag to allow insertion of duplicate aliases
        in type ``btree'' maps.  The semantics of this are undefined
        for regular maps, but it can be useful for the user database.
    MAKEMAP: lock database file while rebuilding to avoid sendmail
        lookups while the rebuild is going on.  There is a race
        condition between the open(... O_TRUNC ...) and the lock
        on the file, but it should be quite small.
    SMRSH: sendmail restricted shell added to the release.  This can
        be used as an alternative to /bin/sh for the "prog" mailer,
        giving the local administrator more control over what
        programs can be run from sendmail.
    MAIL.LOCAL: add this local mailer to the tape.  It is not really
        part of the release proper, and isn't fully supported; in
        particular, it does not run on System V based systems and
        never will.
    CONTRIB: a patch to rmail.c from Bill Gianopoulos of Raytheon
        to allow rmail to compile on systems that don't have
        function prototypes and systems that don't have snprintf.
    CONTRIB: add the "mailprio" scripts that will help you sort mailing
        lists by transaction delay times so that addresses that
        respond quickly get sent first.  This is to prevent very
        sluggish servers from delaying other peoples' mail.
        Contributed by Tony Sanders of BSDI.
    CONTRIB: add the "bsdi.mc" file as contributed by Tony Sanders
        of BSDI.  This has a lot of comments to help people out.
    CONFIG: Don't have .mc files include(../m4/cf.m4) -- instead,
        put this on the m4 command line.  On GNU m4 (which
        supports the __file__ primitive) you can run m4 in an
        arbitrary directory -- use either:
            m4 ${CFDIR}/m4/cf.m4 config.mc > config.cf
        or
            m4 -I${CFDIR} m4/cf.m4 config.mc > config.cf
        On other versions of m4 that don't support __file__, you
        can use:
            m4 -D_CF_DIR_=${CFDIR}/ ${CFDIR}/m4/cf.m4 ...
        (Note the trailing slash on the _CF_DIR_ definition.)
        Old versions of m4 will default to _CF_DIR_=.. for back
        compatibility.
    CONFIG: fix mail from <> so it will properly convert to
        MAILER-DAEMON on local addresses.
    CONFIG: fix code that was supposed to catch colons in host
        names.  Problem noted by John Gardiner Myers of CMU.
    CONFIG: allow use of SMTP_MAILER_MAX in nullclient configuration.
        From Paul Riddle of the University of Maryland, Baltimore
        County.
    CONFIG: Catch and reject "." as a host address.
    CONFIG: Generalize domaintable to look up all domains, not
        just unqualified ones.
    CONFIG: Delete OLD_SENDMAIL support -- as near as I can tell, it
        was never used and didn't work anyway.
    CONFIG: Set flags A, w, 5, :, /, |, and @ on the "local" mailer
        and d on all mailers in the UUCP class.
    CONFIG: Allow "user+detail" to be aliased specially: it will first
        look for an alias for "user+detail", then for "user+*", and
        finally for "user".  This is intended for forwarding mail
        for system aliases such as root and postmaster to a
        centralized hub.
    CONFIG: add confEIGHT_BIT_HANDLING to set option 8 (see above).
    CONFIG: add smtp8 mailer; this has the F=8 (just-send-8) flag set.
        The F=8 flag is also set on the "relay" mailer, since
        this is expected to be another sendmail.
    CONFIG: avoid qualifying all UUCP addresses sent via SMTP with
        the name of the UUCP_RELAY -- in some cases, this is the
        wrong value (e.g., when we have local UUCP connections),
        and this can create unreplyable addresses.  From Chip
        Rosenthal of Unicom.
    CONFIG: add confRECEIVED_HEADER to change the format of the
        Received: header inserted into all messages. Suggested by
        Gary Mills of the University of Manitoba.
    CONFIG: Make "notsticky" the default; use FEATURE(stickyhost)
        to get the old behaviour.  I did this upon observing
        that almost everyone needed this feature, and that the
        concept I was trying to make happen didn't work with
        some user agents anyway.  FEATURE(notsticky) still works,
        but it is a no-op.
    CONFIG: Add LUSER_RELAY -- the host to which unrecognized user
        names are sent, rather than immediately diagnosing them
        as User Unknown.
    CONFIG: Add SMTP_MAILER_ARGS, ESMTP_MAILER_ARGS, SMTP8_MAILER_ARGS,
        and RELAY_MAILER_ARGS to set the arguments for the
        indicated mailers.  All default to "IPC $h".  Patch from
        Larry Parmelee of Cornell University.
    CONFIG: pop mailer needs F=n flag to avoid "annoying side effects
        on the client side" and F=P to get an appropriate
        return-path.  From Kimmo Suominen.
    CONFIG: add FEATURE(local_procmail) to use the procmail program
        as the local mailer.  For addresses of the form "user+detail"
        the "detail" part is passed to procmail via the -a flag.
        Contributed by Kimmo Suominen.
    CONFIG: add MAILER(procmail) to add an interface to procmail for
        use from mailertables.  This lets you execute arbitrary
        procmail scripts.  Contributed by Kimmo Suominen.
    CONFIG: add T= fields (MTS type) to local, smtp, and uucp mailers.
    CONFIG: add OSTYPE(ptx2) for DYNIX/ptx 2.x from Sequent.  From
        Paul Southworth of CICNet Systems Support.
    CONFIG: use -a$g as default to UUCP mailers, instead of -a$f.
        This causes the null return path to be rewritten as
        MAILER-DAEMON; otherwise UUCP gets horribly confused.
        From Michael Hohmuth of Technische Universitat Dresden.
    CONFIG: Add FEATURE(bestmx_is_local) to cause any hosts that
        list us as the best possible MX record to be treated as
        though they were local (essentially, assume that they
        are included in $=w).  This can cause additional DNS
        traffic, but is easier to administer if this fits your
        local model.  It does not work reliably if there are
        multiple hosts that share the best MX preference.
        Code contributed by John Oleynick of Rutgers.
    CONFIG: Add FEATURE(smrsh) to use smrsh (the SendMail Restricted
        SHell) instead of /bin/sh as the program used for delivery
        to programs.  If an argument is included, it is used as
        the path to smrsh; otherwise, /usr/local/etc/smrsh is
        assumed.
    CONFIG: Add LOCAL_MAILER_MAX and PROCMAILER_MAILER_MAX to limit the
        size of messages to the local and procmail mailers
        respectively.  Contributed by Brad Knowles of the Defense
        Information Systems Agency.
    CONFIG: Handle leading ``phrase:'' and trailing ``;'' as comments
        (just like text outside of angle brackets) in order to
        properly deal with ``group: addr1, ... addrN;'' syntax.
    CONFIG: Require OSTYPE macro (the defaults really don't apply to
        any real systems any more) and tweak the DOMAIN macro
        so that it is less likely that users will accidently use
        the Berkeley defaults.  Also, create some generic files
        that really can be used in the real world.
    CONFIG: Add new configuration macros to set character sets for
        messages _arriving from_ various mailers: LOCAL_MAILER_CHARSET,
        SMTP_MAILER_CHARSET, and UUCP_MAILER_CHARSET.
    CONFIG: Change UUCP_MAX_SIZE to UUCP_MAILER_MAX for consistency.
        The old name will still be accepted for a while at least.
    CONFIG: Implement DECNET_RELAY as spec for host to which DECNET
        mail (.DECNET pseudo-domain or node::user) will be sent.
        As with all relays, it can be ``mailer:hostname''.  Suggested
        by Scott Hutton.
    CONFIG: Add MAILER(mail11) to get DECnet support.  Code contributed
        by Barb Dijker of Labyrinth Computer Services.
    CONFIG: change confCHECK_ALIASES to default to False -- it has poor
        performance for large alias files, and this confused many
        people.
    CONFIG: Add confCF_VERSION to append local information to the
        configuration version number displayed during SMTP startup.
    CONFIG: fix [e-mail] syntax (previously it
        would only work when locally addressed.  Fix from
        Edvard Tuinder of Cistron Internet Services.
    CONFIG: use ${opMode} to avoid error on .REDIRECT addresses if option
        "n" (CheckAlaises) is set when rebuilding alias database.
        Based on code contributed by Claude Marinier.
    CONFIG: Allow mailertable to have values of the form
        ``error:code message''.  The ``code'' is a status code
        derived from the sysexits codes -- e.g., NOHOST or UNAVAILABLE.
        Contributed by David James <[e-mail]>.
    CONFIG: add MASQUERADE_DOMAIN(domain list) to extend the list of
        sender domains that will be replaced with the masquerade name.
        These domains will not be treated as local, but if mail passes
        through with sender addresses in those domains they will be
        replaced by the masquerade name.  These can also be specified
        in a file using MASQUERADE_DOMAIN_FILE(filename).
    CONFIG: add FEATURE(masquerade_envelope) to masquerade the envelope
        as well as the header.  Substantial improvements to this
        code were contributed by Per Hedeland.
    CONFIG: add MAILER(phquery) to define a new "ph" mailer; this can be
        accessed from a mailertable to do CCSO ph lookups.  Contributed
        by Kimmo Suominen.
    CONFIG: add MAILER(cyrus) to define a new Cyrus mailer; this can be
        used to define cyrus and cyrusbb mailers (for IMAP support).
        Contributed by John Gardiner Myers of Carnegie Mellon.
    CONFIG: add confUUCP_MAILER to select default mailer to use for
        UUCP addressing.  Suggested by Tom Moore of AT&T GIS.
    NEW FILES:
        cf/cf/cs-hpux10.mc
        cf/cf/cs-solaris2.mc
        cf/cf/cyrusproto.mc
        cf/cf/generic-bsd4.4.mc
        cf/cf/generic-hpux10.mc
        cf/cf/generic-hpux9.mc
        cf/cf/generic-osf1.mc
        cf/cf/generic-solaris2.mc
        cf/cf/generic-sunos4.1.mc
        cf/cf/generic-ultrix4.mc
        cf/cf/huginn.cs.mc
        cf/domain/berkeley-only.m4
        cf/domain/generic.m4
        cf/feature/bestmx_is_local.m4
        cf/feature/local_procmail.m4
        cf/feature/masquerade_envelope.m4
        cf/feature/smrsh.m4
        cf/feature/stickyhost.m4
        cf/feature/use_ct_file.m4
        cf/m4/cfhead.m4
        cf/mailer/cyrus.m4
        cf/mailer/mail11.m4
        cf/mailer/phquery.m4
        cf/mailer/procmail.m4
        cf/ostype/amdahl-uts.m4
        cf/ostype/bsdi2.0.m4
        cf/ostype/hpux10.m4
        cf/ostype/irix5.m4
        cf/ostype/isc4.1.m4
        cf/ostype/ptx2.m4
        cf/ostype/unknown.m4
        contrib/bsdi.mc
        contrib/mailprio
        contrib/rmail.oldsys.patch
        mail.local/mail.local.0
        makemap/makemap.0
        smrsh/README
        smrsh/smrsh.0
        smrsh/smrsh.8
        smrsh/smrsh.c
        src/Makefiles/Makefile.CSOS
        src/Makefiles/Makefile.EWS-UX_V
        src/Makefiles/Makefile.HP-UX.10
        src/Makefiles/Makefile.IRIX.5.x
        src/Makefiles/Makefile.IRIX64
        src/Makefiles/Makefile.ISC
        src/Makefiles/Makefile.KSR
        src/Makefiles/Makefile.NEWS-OS.4.x
        src/Makefiles/Makefile.NEWS-OS.6.x
        src/Makefiles/Makefile.NEXTSTEP
        src/Makefiles/Makefile.NonStop-UX
        src/Makefiles/Makefile.Paragon
        src/Makefiles/Makefile.SCO.3.2v4.2
        src/Makefiles/Makefile.SunOS.5.3
        src/Makefiles/Makefile.SunOS.5.4
        src/Makefiles/Makefile.SunOS.5.5
        src/Makefiles/Makefile.UNIX_SV.4.x.i386
        src/Makefiles/Makefile.uts.systemV
        src/Makefiles/Makefile.UX4800
        src/aliases.0
        src/mailq.0
        src/mime.c
        src/newaliases.0
        src/sendmail.0
        test/t_seteuid.c
    RENAMED FILES:
        cf/cf/alpha.mc =>        cf/cf/s2k-osf1.mc
        cf/cf/chez.mc =>        cf/cf/chez.cs.mc
        cf/cf/hpux-cs-exposed.mc =>    cf/cf/cs-hpux9.mc
        cf/cf/osf1-cs-exposed.mc =>    cf/cf/cs-osf1.mc
        cf/cf/s2k.mc =>            cf/cf/s2k-ultrix4.mc
        cf/cf/sunos4.1-cs-exposed.mc =>    cf/cf/cs-sunos4.1.mc
        cf/cf/ultrix4.1-cs-exposed.mc => cf/cf/cs-ultrix4.mc
        cf/cf/vangogh.mc =>        cf/cf/vangogh.cs.mc
        cf/domain/Berkeley.m4 =>    cf/domain/Berkeley.EDU.m4
        cf/domain/cs-exposed.m4 =>    cf/domain/CS.Berkeley.EDU.m4
        cf/domain/eecs-hidden.m4 =>    cf/domain/EECS.Berkeley.EDU.m4
        cf/domain/s2k.m4 =>        cf/domain/S2K.Berkeley.EDU.m4
        cf/ostype/hpux.m4 =>        cf/ostype/hpux9.m4
        cf/ostype/irix.m4 =>        cf/ostype/irix4.m4
        cf/ostype/ultrix4.1.m4 =>    cf/ostype/ultrix4.m4
        src/Makefile.* =>        src/Makefiles/Makefile.*
        src/Makefile.AUX =>        src/Makefiles/Makefile.A-UX
        src/Makefile.BSDI =>        src/Makefiles/Makefile.BSD-OS
        src/Makefile.DGUX =>        src/Makefiles/Makefile.dgux
        src/Makefile.RISCos =>        src/Makefiles/Makefile.UMIPS
        src/Makefile.SunOS.4.0.3 =>    src/Makefiles/Makefile.SunOS.4.0
    OBSOLETED FILES:
        cf/cf/cogsci.mc
        cf/cf/cs-exposed.mc
        cf/cf/cs-hidden.mc
        cf/cf/hpux-cs-hidden.mc
        cf/cf/knecht.mc
        cf/cf/osf1-cs-hidden.mc
        cf/cf/sunos3.5-cs-exposed.mc
        cf/cf/sunos3.5-cs-hidden.mc
        cf/cf/sunos4.1-cs-hidden.mc
        cf/cf/ultrix4.1-cs-hidden.mc
        cf/domain/cs-hidden.m4
        contrib/rcpt-streaming
        src/Makefiles/Makefile.SunOS.5.x

8.6.13/8.6.12    96/01/25
    SECURITY: In some cases it was still possible for an attacker to
        insert newlines into a queue file, thus allowing access to
        any user (except root).
    CONFIG: no changes -- it is not a bug that the configuration
        version number is unchanged.

8.6.12/8.6.12    95/03/28
    Fix to IDENT code (it was getting the size of the reply buffer
        too small, so nothing was ever accepted).  Fix from several
        people, including Allan Johannesen, Shane Castle of the
        Boulder County Information Services, and Jeff Smith of
        Warwick University (all arrived within a few hours of
        each other!).
    Fix a problem that could cause large jobs to run out of
        file descriptors on systems that use vfork() rather
        than fork().

8.6.11/8.6.11    95/03/08
    The ``possible attack'' message would be logged more often
        than necessary if you are using Pine as a user agent.
    The wrong host would be reported in the ``possible attack''
        message when attempted from IDENT.
    In some cases the syslog buffer could be overflowed when
        reporting the ``possible attack'' message.  This can
        cause denial of service attacks.  Truncate the message
        to 80 characters to prevent this problem.
    When reading the IDENT response a loop is needed around the
        read from the network to ensure that you don't get
        partial lines.
    Password entries without any shell listed (that is, a null
        shell) wouldn't match as "ok".  Problem noted by
        Rob McMahon.
    When running BIND 4.9.x a problem could occur because the
        _res.options field is initialized differently than it
        was historically -- this requires that sendmail call
        res_init before it tweaks any bits.
    Fix an incompatibility in openxscript() between the file open mode
        and the stdio mode passed to fdopen.  This caused UnixWare
        2.0 to have conniptions.  Fix from Martin Sohnius of
        Novell Labs Europe.
    Fix problem with static linking of local getopt routine when
        using GNU's ld command.  Fix from John Kennedy of
        Cal State Chico.
    It was possible to turn off privacy flags.  Problem noted by
        *Hobbit*.
    Be more paranoid about writing files.  Suggestions by *Hobbit*
        and Liudvikas Bukys.
    MAKEMAP: fixes for 64 bit machines (DEC Alphas in particular)
        from Spider Boardman.
    CONFIG: No changes (version number only, to keep it in sync
        with the binaries).

8.6.10/8.6.10    95/02/10
    SECURITY: Diagnose bogus values to some command line flags that
        could allow trash to get into headers and qf files.
    Validate the name of the user returned by the IDENT protocol.
        Some systems that really dislike IDENT send intentionally
        bogus information.  Problem pointed out by Michael Bushnell
        of the Free Software Foundation.  Has some security
        implications.
    Fix a problem causing error messages about DNS problems when
        the host name contained a percent sign to act oddly
        because it was passed as a printf-style format string.
        In some cases this could cause core dumps.
    Avoid possible buffer overrun in returntosender() if error
        message is quite ling.  From Fletcher Mattox of the
        University of Texas.
    Fix a problem that would silently drop "too many hops" error
        messages if and only if you were sending to an alias.
        From Jon Giltner of the University of Colorado and
        Dan Harton of Oak Ridge National Laboratory.
    Fix a bug that caused core dumps on some systems if -d11.2 was
        set and e->e_message was null.  Fix from Bruce Nagel of
        Data General.
    Fix problem that can still cause df files to be left around
        after "hop count exceeded" messages.  Fix from Andrew
        Chang and Shau-Ping Lo of SunSoft.
    Fix a problem that can cause buffer overflows on very long
        user names (as might occur if you piped to a program
        with a lot of arguments).
    Avoid returning an error and re-queueing if the host signature
        is null; this can occur on addresses like ``user@.''.
        Problem noted by Wesley Craig and the University of
        Michigan.
    Avoid possible calls to malloc(0) if MCI caching is turned
        off.  Bug fix from Pierre David of the Laboratoire
        Parallelisme, Reseaux, Systemes et Modelisation (PRiSM),
        Universite de Versailles - St Quentin, and Jacky
        Thibault.
    Make a local copy of the line being sent via senttolist() -- in
        some cases, buffers could get trashed by map lookups
        causing it to do unexpected things.  This also simplifies
        some of the map code.
    CONFIG: No changes (version number only, to keep it in sync
        with the binaries).

8.6.9/8.6.9    94/04/19
    Do all mail delivery completely disconnected from any terminal.
        This provides consistency with daemon delivery and
        may have some security implications.
    Make sure that malloc doesn't get called with zero size,
        since that fails on some systems.  Reported by Ed
        Hill of the University of Iowa.
    Fix multi-line values for $e (SMTP greeting message).  Reported
        by Mike O'Connor of Ford Motor Company.
    Avoid syserr if no NIS domain name is defined, but the map it
        is trying to open is optional.  From Win Bent of USC.
    Changes for picky compilers from Ed Gould of Digital Equipment.
    Hesiod support for UDB from Todd Miller of the University of
        Colorado.  Use "hesiod" as the service name in the U
        option.
    Fix a problem that failed to set the "authentic" host name (that
        is, the one derived from the socket info) if you called
        sendmail -bs from inetd.  Based on code contributed by
        Todd Miller (this problem was also reported by Guy Helmer
        of Dakota State University).  This also fixes a related
        problem reported by Liudvikas Bukys of the University of
        Rochester.
    Parameterize "nroff -h" in all the Makefiles so people with
        variant versions can use them easily.  Suggested by
        Peter Collinson of Hillside Systems.
    SMTP "MAIL" commands with multiple ESMTP parameters required two
        spaces between parameters instead of one.  Reported by
        Valdis Kletnieks of Virginia Tech.
    Reduce the number of system calls during message collection by
        using global timeouts around the collect() loop.  This
        code was contributed by Eric Wassenaar.
    If the initial hostname name gathering results in a name
        without a dot (usually caused by NIS misconfiguration)
        and BIND is compiled in, directly access DNS to get
        the canonical name.  This should make life easier for
        Solaris systems.  If it still can't be resolved, and
        if the name server is listed as "required", try again
        in 30 seconds.  If that also fails, exit immediately to
        avoid bogus "config error: mail loops back to myself"
        messages.
    Improve the "MAIL DELETED BECAUSE OF LACK OF DISK SPACE" error
        message to explain how much space was available and
        sound a bit less threatening.  Suggested by Stan Janet
        of the National Institute of Standards and Technology.
    If mail is delivered to an alias that has an owner, deliver any
        requested return-receipt immediately, and strip the
        Return-Receipt-To: header from the subsequent message.
        This prevents a certain class of denial of service
        attack, arguably gives more reasonable semantics, and
        moves things more towards what will probably become a
        network standard.  Suggested by Christopher Davis of
        Kapor Enterprises.
    Add a "noreceipts" privacy flag to turn off all return receipts
        without recompiling.
    Avoid printing ESMTP parameters as part of the error message
        if there are errors during parsing.  This change is
        purely cosmetic.
    Avoid sending out error messages during the collect phase of
        SMTP; there is an MVS mailer from UCLA that gets
        confused by this.  Of course, I think it's their bug....
    Check for the $j macro getting undefined, losing a dot, or getting
        lost from $=w in the daemon before accepting a connection;
        if it is, it dumps state, prints a LOG_ALERT message,
        and drops core for debugging.  This is an attempt to
        track down a bug that I thought was long since gone.
        If you see this, please forward the log fragment to
        [e-mail].
    Change OLD_NEWDB from a #ifdef to a #if so it can be turned off
        with -DOLD_NEWDB=0 on the command line.  From Christophe
        Wolfhugel.
    Instead of trying to truncate the listen queue for the server
        SMTP port when the load average is too high, just close
        the port completely and reopen it later as needed.
        This ensures that the other end gets a quick "connection
        refused" response, and that the connection can be
        recovered later.  In particular, some socket emulations
        seem to get confused if you tweak the listen queue
        size around and can never start listening to connections
        again.  The down side is that someone could start up
        another daemon process in the interim, so you could
        have multiple daemons all not listening to connections;
        this could in turn cause the sendmail.pid file to be
        incorrect.  A better approach might be to accept the
        connection and give a 421 code, but that could break
        other mailers in mysterious ways and have paging behaviour
        implications.
    Fix a glitch in TCP-level debugging that caused flag 16.101 to
        set debugging on the wrong socket.  From Eric Wassenaar.
    When creating a df* temporary file, be sure you truncate any
        existing data in the file -- otherwise system crashes
        and the like could result in extra data being sent.
    DOC: Replace the CHANGES-R5-R8 readme file with a paper in the
        doc directory.  This includes some additional
        information.
    CONFIG: change UUCP rules to never add $U! or $k! on the front
        of recipient envelope addresses.  This should have been
        handled by the $&h trick, but broke if people were
        mixing domainized and UUCP addresses.  They should
        probably have converted all the way over to uucp-uudom
        instead of uucp-{new,old}, but the failure mode was to
        loop the mail, which was bad news.
    Portability fixes:
        Newer BSDI systems (several people).
        Older BSDI systems from Christophe Wolfhugel.
        Intergraph CLIX, from Paul Southworth of CICNet.
        UnixWare, from Evan Champion.
        NetBSD from Adam Glass.
        Solaris from Quentin Campbell of the University of
            Newcastle upon Tyne.
        IRIX from Dean Cookson and Bill Driscoll of Mitre
            Corporation.
        NCR 3000 from Kevin Darcy of Chrysler Financial Corporation.
        SunOS (it has setsid() and setvbuf() calls) from
            Jonathan Kamens of OpenVision Technologies.
        HP-UX from Tor Lillqvist.
    New Files:
        src/Makefile.CLIX
        src/Makefile.NCR3000
        doc/changes/Makefile
        doc/changes/changes.me
        doc/changes/changes.ps

8.6.8/8.6.6    94/03/21
    SECURITY: it was possible to read any file as root using the
        E (error message) option.  Reported by Richard Jones;
        fixed by Michael Corrigan and Christophe Wolfhugel.

8.6.7/8.6.6    94/03/14
    SECURITY: it was possible to get root access by using weird
        values to the -d flag.  Thanks to Alain Durand of
        INRIA for forwarding me the notice from the bugtraq
        list.

8.6.6/8.6.6    94/03/13
    SECURITY: the ability to give files away on System V-based
        systems proved dangerous -- don't run as the owner
        of a :include: file on a system that allows giveaways.
        Unfortunately, this also applies to determining a
        valid shell.
    IMPORTANT: Previous versions weren't expiring old connections
        in the connection cache for a long time under some
        circumstances.  This could result in resource exhaustion,
        both at your end and at the other end.  This checks the
        connections for timeouts much more frequently.  From
        Doug Anderson of NCSC.
    Fix a glitch that snuck in that caused programs to be run as
        the sender instead of the recipient if the mail was
        from a local user to another local user.  From
        Motonori Nakamura of Kyoto University.
    Fix "wildcard" on /etc/shells matching -- instead of looking
        for "*", look for "/SENDMAIL/ANY/SHELL/".  From
        Bryan Costales of ICSI.
    Change the method used to declare the "statfs" availability;
        instead of HASSTATFS and/or HASUSTAT with a ton of
        tweaking in conf.c, there is a single #define called
        SFS_TYPE which takes on one of six values (SFS_NONE
        for no statfs availability, SFS_USTAT for the ustat(2)
        syscall, SFS_4ARGS for a four argument statfs(2) call,
        and SFS_VFS, SFS_MOUNT, or SFS_STATFS for a two argument
        statfs(2) call with the declarations in <sys/vfs.h>,
        <sys/mount.h>, or <sys/statfs.h> respectively).
    Fix glitch in NetInfo support that could return garbage if
        there was no "/locations/sendmail" property.  From
        David Meyer of the University of Virginia.
    Change HASFLOCK from defined/not-defined to a 0/1 definition
        to allow Linux to turn it off even though it is a
        BSD-like system.
    Allow setting of "ident" timeout to zero to turn off the ident
        protocol entirely.
    Make 7-bit stripping local to a connection (instead of to a
        mailer); this allows you to specify that SMTP is a
        7-bit channel, but revert to 8-bit should it advertise
        that it supports 8BITMIME.  You still have to specify
        mailer flag 7 to get this stripping at all.
    Improve makesendmail script so it handles more cases automatically.
    Tighten up restrictions on taking ownership of :include: files
        to avoid problems on systems that allow you to give away
        files.
    Fix a problem that made it impossible to rebuild the alias
        file if it was on a read-only file system.  From
        Harry Edmon of the University of Washington.
    Improve MX randomization function.  From John Gardiner Myers
        of CMU.
    Fix a minor glitch causing a bogus message to be printed (used
        %s instead of %d in a printf string for the line number)
        when a bad queue file was read.  From Harry Edmon.
    Allow $s to remain NULL on locally generated mail.  I'm not
        sure this is necessary, but a lot of people have complained
        about it, and there is a legitimate question as to whether
        "localhost" is legal as an 822-style domain.
    Fix a problem with very short line lengths (mailer L= flag) in
        headers.  This causes a leading space to be added onto
        continuation lines (including in the body!), and also
        tries to wrap headers containing addresses (From:, To:,
        etc) intelligently at the shorter line lengths.  Problem
        Reported by Lars-Johan Liman of SUNET Operations Center.
    Log the real user name when logging syserrs, since these can have
        security implications.  Suggested by several people.
    Fix address logging of cached connections -- it used to always
        log the numeric address as zero.  This is a somewhat
        bogus implementation in that it does an extra system
        call, but it should be an inexpensive one.  Fix from
        Motonori Nakamura.
    Tighten up handling of short syslog buffers even more -- there
        were cases where the outgoing relay= name was too long
        to share a line with delay= and mailer= logging.
    Limit the overhead on split envelopes to one open file descriptor
        per envelope -- previously the overhead was three
        descriptors.  This was in response to a problem reported
        by P{r (Pell) Emanuelsson.
    Fixes to better handle the case of unexpected connection closes;
        this redirects the output to the transcript so the info
        is not lost.  From Eric Wassenaar.
    Fix potential string overrun if you macro evaluate a string that
        has a naked $ at the end.  Problem noted by James Matheson
        <[e-mail]>.
    Make default error number on $#error messages 553 (``Requested
        action not taken: mailbox name not allowed'') instead of
        501 (``Syntax error in parameters or arguments'') to
        avoid bogus "protocol error" messages.
    Strip off any existing trailing dot on names during $[ ... $]
        lookup.  This prevents it from ending up with two dots
        on the end of dot terminated names.  From Wesley Craig
        of the University of Michigan and Bryan Costales of ICSI.
    Clean up file class reading so that the debugging information is
        more informative.  It hadn't been using setclass, so you
        didn't see the class items being added.
    Avoid core dump if you are running a version of sendmail where
        NIS is compiled in, and you specify an NIS map, but
        NIS is not running.  Fix from John Oleynick of
        Rutgers.
    Diagnose bizarre case where res_search returns a failure value,
        but sets h_errno to a success value.
    Make sure that "too many hops" messages are considered important
        enough to send an error to the Postmaster (that is, the
        address specified in the P option).  This fix should
        help problems that cause the df file to be left around
        sometimes -- unfortunately, I can't seem to reproduce
        the problem myself.
    Avoid core dump (null pointer reference) on EXPN command; this
        only occurred if your log level was set to 10 or higher
        and the target account was an alias or had a .forward file.
        Problem noted by Janne Himanka.
    Avoid "denial of service" attacks by someone who is flooding your
        SMTP port with bad commands by shutting the connection
        after 25 bad commands are issued.  From Kyle Jones of
        UUNET.
    Fix core dump on error messages with very long "to" buffers;
        fmtmsg overflows the message buffer.  Fixed by trimming
        the to address to 203 characters.  Problem reported by
        John Oleynick.
    Fix configuration for HASFLOCK -- there were some spots where
        a #ifndef was incorrectly #ifdef.  Pointed out by
        George Baltz of the University of Maryland.
    Fix a typo in savemail() that could cause the error message To:
        lists to be incorrect in some places.  From Motonori
        Nakamura.
    Fix a glitch that can cause duplicate error messages on split
        envelopes where an address on one of the lists has a
        name server failure.  Fix from Voradesh Yenbut of the
        University of Washington.
    Fix possible bogus pointer reference on ESMTP parameters that
        don't have an ``=value'' part.
    CNAME loops caused an error message to be generated, but also
        re-queued the message.  Changed to just re-queue the
        message (it's really hard to just bounce it because
        of the weird way the name server works in the presence
        of CNAME loops).  Problem noted by James M.R.Matheson
        of Cambridge University.
    Avoid giving ``warning: foo owned process doing -bs'' messages
        if they use ``MAIL FROM:<foo>'' where foo is their true
        user name.  Suggested by Andreas Stolcke of ICSI.
    Change the NAMED_BIND compile flag to be a 0/1 flag so you can
        override it easily in the Makefile -- that is, you can
        turn it off using -DNAMED_BIND=0.
    If a gethostbyname(...) of an address with a trailing dot fails,
        try it without the trailing dot.  This is because if
        you have a version of gethostbyname() that falls back
        to NIS or the /etc/hosts file it will fail to find
        perfectly reasonable names that just don't happen to
        be dot terminated in the hosts file.  You don't want to
        strip the dot first though because we're trying to ensure
        that country names that match one of your subdomains get
        a chance.
    PRALIASES: fix bogus output on non-null-terminated strings.
        From Bill Gianopoulos of Raytheon.
    CONFIG: Avoid rewriting anything that matches $w to be $j.
        This was in code intended to only catch the self-literal
        address (that is, [1.2.3.4], where 1.2.3.4 is your
        IP address), but the code was broken.  However, it will
        still do this if $M is defined; this is necessary to
        get client configurations to work (sigh).  Note that this
        means that $M overrides :mailname entries in the user
        database!  Problem noted by Paul Southworth.
    CONFIG: Fix definition of Solaris help file location.  From
        Steve Cliffe <[e-mail]>.
    CONFIG: Fix bug that broke news.group.USENET mappings.
    CONFIG: Allow declaration of SMTP_MAILER_MAX, FAX_MAILER_MAX,
        and USENET_MAILER_MAX to tweak the maximum message
        size for various mailers.
    CONFIG: Change definition of USENET_MAILER_ARGS to include argv[0]
        instead of assuming that it is "inews" for consistency
        with other mailers.  From Michael Corrigan of UC San Diego.
    CONFIG: When mail is forwarded to a LOCAL_RELAY or a MAIL_HUB,
        qualify the address in the SMTP envelope as user@{relay|hub}
        instead of user@$j.  From Bill Wisner of The Well.
    CONFIG: Fix route-addr syntax in nullrelay configuration set.
    CONFIG: Don't turn off case mapping of user names in the local
        mailer for IRIX.  This was different than most every other
        system.
    CONFIG: Avoid infinite loops on certainly list:; syntaxes in
        envelope.  Noted by Thierry Besancon
        <[e-mail]>.
    CONFIG: Don't include -z by default on uux line -- most systems
        don't want it set by default.  Pointed out by Philippe
        Michel of Thomson CSF.
    CONFIG: Fix some bugs with mailertables -- for example, if your
        host name was foo.bar.ray.com and you matched against
        ".ray.com", the old implementation bound %1 to "bar"
        instead of "foo.bar".  Also, allow "." in the mailertable
        to match anything -- essentially, take over SMART_HOST.
        This also moves matching of explicit local host names
        before the mailertable so they don't have to be special
        cased in the mailertable data.  Reported by Bill
        Gianopoulos of Raytheon; the fix for the %1 binding
        problem was contributed by Nicholas Comanos of the
        University of Sydney.
    CONFIG: Don't include "root" in class $=L (users to deliver
        locally, even if a hub or relay exists) by default.
        This is because of the known bug where definition of
        both a LOCAL_RELAY and a MAIL_HUB causes $=L to ignore
        both and deliver into the local mailbox.
    CONFIG: Move up bitdomain and uudomain handling so that they
        are done before .UUCP class matching; uudomain was
        reported as ineffective before.  This also frees up
        diversion 8 for future use.  Problem reported by Kimmo
        Suominen.
    CONFIG: Don't try to convert dotted IP address (e.g., [1.2.3.4])
        into host names.  As pointed out by Jonathan Kamens,
        these are often used because either the forward or reverse
        mapping is broken; this translation makes it broken again.
    DOC: Clarify $@ and $: in the Install & Op Guide.  From Kimmo
        Suominen.
    Portability fixes:
        Unicos from David L. Kensiski of Sterling Sofware.
        DomainOS from Don Lewis of Silicon Systems.
        GNU m4 1.0.3 from Karst Koymans of Utrecht University.
        Convex from Kimmo Suominen <[e-mail]>.
        NetBSD from Adam Glass <[e-mail]>.
        BSD/386 from Tony Sanders of BSDI.
        Apollo from Eric Wassenaar.
        DGUX from Doug Anderson.
        Sequent DYNIX/ptx 2.0 from Tim Wright of Sequent.
    NEW FILES:
        src/Makefile.DomainOS
        src/Makefile.PTX
        src/Makefile.SunOS.5.1
        src/Makefile.SunOS.5.2
        src/Makefile.SunOS.5.x
        src/mailq.1
        cf/ostype/domainos.m4
        doc/op/Makefile
        doc/intro/Makefile
        doc/usenix/Makefile

8.6.5/8.6.5    94/01/13
    Security fix:  /.forward could be owned by anyone (the test
        to allow root to own any file was backwards).  From
        Bob Campbell at U.C. Berkeley.
    Security fix: group ids were not completely set when programs
        were invoked.  This caused programs to have group
        permissions they should not have had (usually group
        daemon instead of their own group).  In particular,
        Perl scripts would refuse to run.
    Security: check to make sure files that are written are not
        symbolic links (at least under some circumstances).
        Although this does not respond to a specific known
        attack, it's just a good idea.  Suggested by
        Christian Wettergren.
    Security fix: if a user had an NFS mounted home directory on
        a system with a restricted shell listed in their
        /etc/passwd entry, they could still execute any
        program by putting that in their .forward file.
        This fix prevents that by insisting that their shell
        appear in /etc/shells before allowing a .forward to
        execute a program or write a file.  You can disable
        this by putting "*" in /etc/shells.  It also won't
        permit world-writable :include: files to reference
        programs or files (there's no way to disable this).
        These behaviours are only one level deep -- for
        example, it is legal for a world-writable :include:
        file to reference an alias that writes a file, on
        the assumption that the alias file is well controlled.
    Security fix: root was not treated suspiciously enough when
        looking into subdirectories.  This would potentially
        allow a cracker to examine files that were publically
        readable but in a non-publically searchable directory.
    Fix a problem that causes an error on QUIT on a cached
        connection to create problems on the current job.
        These are typically unrelated, so errors occur in
        the wrong place.
    Reset CurrentLA in sendall() -- this makes sendmail queue
        runs more responsive to load average, and fixes a
        problem that ignored the load average in locally
        generated mail.  From Eric Wassenaar.
    Fix possible core dump on aliases with null LHS.  From
        John Orthoefer of BB&N.
    Revert to using flock() whenever possible -- there are just
        too many bugs in fcntl() locking, particularly over
        NFS, that cause sendmail to fail in perverse ways.
    Fix a bug that causes the connection cache to get confused
        when sending error messages.  This resulted in
        "unexpected close" messages.  It should fix itself
        on the following queue run.  Problem noted by
        Liudvikas Bukys of the University of Rochester.
    Include $k in $=k as documented in the Install & Op Guide.
        This seems odd, but it was documented....  From
        Michael Corrigan of UCSD.
    Fix problem that caused :include:s from alias files to be
        forced to be owned by root instead of daemon
        (actually DefUid).  From Tim Irvin.
    Diagnose unrecognized I option values -- from Mortin Forssen
        of the Chalmers University of Technology.
    Make "error" mailer work consistently when there is no error
        code associated with it -- previously it returned OK
        even though there was a real problem.  Now it assumes
        EX_UNAVAILABLE.
    Fix bug that caused the last header line of messages that had
        no body and which were terminated with EOF instead of
        "." to be discarded.  Problem noted by Liudvikas Bukys.
    Fix core dump on SMTP mail to programs that failed -- it tried
        to go to a "next MX host" when none existed, causing
        a core dump.  From der Mouse at McGill University.
    Change IDENTPROTO from a defined/not defined to a 0/1 switch;
        this makes it easier to turn it off (using
        -DIDENTPROTO=0 in the Makefile).  From der Mouse.
    Fix YP_MASTER_NAME store to use the unupdated result of
        gethostname() (instead of myhostname(), which tries
        to fully qualify the name) to be consistent with
        SunOS.  If your hostname is unqualified, this fixes
        transfers to slave servers.  Bug noted by Keith
        McMillan of Ameritech Services, Inc.
    Fix Ultrix problem: gethostbyname() can return a very large
        (> 500) h_length field, which causes the sockaddr
        to be trashed.  Use the size of the sockaddr instead.
        Fix from Bob Manson of Ohio State.
    Don't assume "-a." on host lookups if NAMED_BIND is not
        defined -- this confuses gethostbyname on hosts
        file lookups, which doesn't understand the trailing
        dot convention.
    Log SMTP server subprocesses that die with a signal instead
        of from a clean exit.
    If you don't have option "I" set, don't assume that a DNS
        "host unknown" message is authoritative -- it
        might still be found in /etc/hosts.
    Fix a problem that would cause Deferred: messages to be sent
        as the subject of an error message, even though the
        actual cause of a message was more severe than that.
        Problem noted by Chris Seabrook of OSSI.
    Fix race condition in DBM alias file locking.  From Kyle
        Jones of UUNET.
    Limit delivery syslog line length to avoid bugs in some
        versions of syslog(3).  This adds a new compile time
        variable SYSLOG_BUFSIZE.  From Jay Plett of Princeton
        University, which is in turn derived from IDA.
    Fix quotes inside of comments in addresses -- previously
        it insisted that they be balanced, but the 822 spec
        says that they should be ignored.
    Dump open file state to syslog upon receiving SIGUSR1 (for
        debugging).  This also evaluates ruleset 89, if set
        (with the null input), and logs the result.  This
        should be used sparingly, since the rewrite process
        is not reentrant.
    Change -qI, -qR, and -qS flags to be case-insensitive as
        documented in the Bat Book.
    If the mailer returned EX_IOERR or EX_OSERR, sendmail did not
        return an error message and did not requeue the message.
        Fix based on code from Roland Dirlewanger of
        Reseau Regional Aquarel, Bordeaux, France.
    Fix a problem that caused a seg fault if you got a 421 error
        code during some parts of connection initialization.
        I've only seen this when talking to buggy mailers on
        the other end, but it shouldn't give a seg fault in
        any case.  From Amir Plivatsky.
    Fix core dump caused by a ruleset call that returns null.
        Fix from Bryan Costales of ICSI.
    Full-Name: field was being ignored.  Fix from Motonori Nakamura
        of Kyoto University.
    Fix a possible problem with very long input lines in setproctitle.
        From P{r Emanuelsson.
    Avoid putting "This is a warning message" out on return receipts.
        Suggested by Douglas Anderson.
    Detect loops caused by recursive ruleset calls.  Suggested by
        Bryan Costales.
    Initialize non-alias maps during alias rebuilds -- they may be
        needed for parsing.  Problem noted by Douglas Anderson.
    Log sender address even if no message was collected in SMTP
        (e.g., if all RCPTs failed).  Suggested by Motonori
        Nakamura.
    Don't reflect the owner-list contents into the envelope sender
        address if the value contains ", :, /, or | (to avoid
        illegal addresses appearing there).
    Efficiency hack for toktype macro -- from Craig Partridge of
        BB&N.
    Clean up DNS error printing so that a host name is always
        included.
    Remember to set $i during queue runs.  Reported by Stephen
        Campbell of Dartmouth University.
    If the environment variable HOSTALIASES is set, use it during
        canonification as the name of a file with per-user host
        translations so that headers are properly mapped.  Reported
        by Anne Bennett of Concordia University.
    Avoid printing misleading error message if SMTP mailer (not
        using [IPC]) should die on a core dump.
    Avoid incorrect diagnosis of "file 1 closed" when it is caused
        by the other end closing the connection.  From
        Dave Morrison of Oracle.
    Improve several of the error messages printed by "mailq"
        to include a host name or other useful information.
    Add NetInfo preliminary support for NeXT systems.  From Vince
        DeMarco.
    Fix a glitch that sometimes caused :include:s that pointed to
        NFS filesystems that were down to give an "aliasing/
        forwarding loop broken" message instead of queueing
        the message for retry.  Noted by William C Fenner of
        the NRL Connection Machine Facility.
    Fix a problem that could cause a core dump if the input sequence
        had (or somehow acquired) a \231 character.
    Make sure that route-addrs always have <angle brackets> around
        them in non-SMTP envelopes (SMTP envelopes already do
        this properly).
    Avoid weird headers on unbalanced punctuation of the form:
        ``Joe User <user)'' -- this caused reference to the
        null macro.  Fix from Rick McCarty of IO.COM.
    Fix a problem that caused an alias "user: [e-mail]" to
        not have the QNOTREMOTE bit set; this caused configs
        to act as if FEATURE(notsticky) was defined even when
        it was not.  The effect of the problem was to make it
        very hard to to set up satellite sites that had a few
        local accounts, with everything else forwarded to a
        corporate hub.  Reported by Detlef Drewanz of the
        University of Rostock and Mark Frost of NCD.
    Change queuing to not call rulesets 3, {1 or 2}, 4 on header
        addresses.  This is more efficient (fewer name server
        calls) and fixes certain unusual configurations, such
        as those that have ruleset 4 do something that is
        non-idempotent unless a mailer-specific ruleset did
        something else.  Problem reported by Brian J. Coan
        of the Institute for Global Communications.
    Fix the "obsolete argument" routine in main to better understand
        new arguments.  For example, if you used ``sendmail
        -C config -v -q'' it would choke on the -q because
        the -C would stop looking for old-format arguments.
    Fix the code that was intended to allow two users to forward their
        mail to the same program and have them appear unique.
    Portability fixes for:
        SCO UNIX from Murray Kucherawy.
        SCO Open Server 3.2v4 from Philippe Brand.
        System V Release 4 from Rick Ellis and others.
        OSF/1 from Steve Campbell.
        DG/UX from Ben Mesander of the USGS and Bryan Curnutt
            of Stoner Associates.
        Motorola SysV88 from Kevin Johnson of Motorola.
        Solaris 2.3 from Casper H.S. Dik of the University
            of Amsterdam and John Caruso of University
            of Maryland.
        FreeBSD from Ollivier Robert.
        NetBSD from Adam Glass.
        TitanOS from Kate Hedstrom of Rutgers University.
        Irix from Bryan Curnutt.
        Dynix from Jim Davis of the University of Arizona.
        RISC/os.
        Linux from John Kennedy of California State University
            at Chico.
        Solaris 2.x from Tony Boner of the U.S. Air Force.
        NEXTSTEP 3.x from Vince DeMarco.
        HP-UX from various people.  NOTA BENE:  the location
            of the config file has moved to /usr/lib
            to match the HP-UX version of sendmail.
    CONFIG: Don't do any recipient rewriting on relay mailer;
        since this is intended only for internal use, the
        usual RFC 821/822/1123 rules can be relaxed.  The
        main point of this is to avoid munging (ugh) UUCP
        addresses when relaying internally.
    CONFIG: fix typo in mailer/uucp.m4 that mutilates list:;
        syntax addresses delivered via UUCP.  Solution
        provided by Peter Wemm.
    CONFIG: fix thumb-fumble in default UUCP relaying in ruleset
        zero; it caused double @ signs in addresses.  From
        Irving Reid of the University of Toronto.
    CONFIG: Portability fixes for SCO Unix 3.2 with TCP/IP 1.2.1
        from Markku Toijala of ICL Personal Systems Oy.
    CONFIG: Add trailing "." on pseudo-domains for consistency;
        this fixes a problem (noted by Al Whaley of Sunnyside)
        that made it hard to recognize your own pseudodomain
        names.
    CONFIG: catch "@host" syntax errors (i.e., null local-parts)
        rather than letting them get "local configuration
        error"s.  Problem noted by John Gardiner Myers.
    CONFIG: add uucp-uudom mailer variant, based on code posted
        by Spider Boardman <[e-mail]>; this
        has uucp-dom semantics but old UUCP syntax.  This
        also permits "uucp-old" as an alias for "uucp" and
        "uucp-new" as a synonym for "suucp" for consistency.
    CONFIG: add POP mailer support (from Kimmo Suominen
        <[e-mail]>).
    CONFIG: drop CSNET_RELAY support -- CSNET is long gone.
    CONFIG: fix bug caused with domain literal addresses (e.g.,
        ``[128.32.131.12]'') when FEATURE(allmasquerade)
        was set; it would get an additional @masquerade.host
        added to the address.  Problem noted by Peter Wan
        of Georgia Tech.
    CONFIG: make sure that the local UUCP name is in $=w.  From
        Jim Murray of Stratus.
    CONFIG: changes to UUCP rewriting to simulate IDA-style "V"
        mailer flag.  Briefly, if you are sending to host
        "foo", then it rewrites "foo!...!baz" to "...!baz",
        "foo!baz" remains "foo!baz", and anything else has
        the local name prepended.
    CONFIG: portability fixes for HP-UX.
    DOC: several minor problems fixed in the Install & Op Guide.
    MAKEMAP: fix core dump problem on lines that are too long or
        which lack newline.  From Mark Delany.
    MAILSTATS: print sums of columns (total messages & kbytes
        in and out of the system).  From Tom Ferrin of UC
        San Francisco Computer Graphics Lab.
    SIGNIFICANT USER- OR SYSAD-VISIBLE CHANGES:
        On HP-UX, /etc/sendmail.cf has been moved to
            /usr/lib/sendmail.cf to match HP sendmail.
        Permissions have been tightened up on world-writable
            :include: files and accounts that have shells
            that are not listed in /etc/shells.  This may
            cause some .forward files that have worked
            before to start failing.
        SIGUSR1 dumps some state to the log.
    NEW FILES:
        src/Makefile.DGUX
        src/Makefile.Dynix
        src/Makefile.FreeBSD
        src/Makefile.Mach386
        src/Makefile.NetBSD
        src/Makefile.RISCos
        src/Makefile.SCO
        src/Makefile.SVR4
        src/Makefile.Titan
        cf/mailer/pop.m4
        cf/ostype/bsdi1.0.m4
        cf/ostype/dgux.m4
        cf/ostype/dynix3.2.m4
        cf/ostype/sco3.2.m4
        makemap/Makefile.dist
        praliases/Makefile.dist

8.6.4/8.6.4    93/10/31
    Repair core-dump problem (write to read-only memory segment)
        if you fall back to the return-to-Postmaster case in
        savemail.  Problem reported by Richard Liu.
    Immediately diagnose bogus sender addresses in SMTP.  This
        makes quite certain that crackers can't use this
        class of attack.
    Reliability Fix:  check return value from fclose() and fsync()
        in a few critical places.
    Minor problem in initsys() that reversed a condition for
        redirecting the output channel on queue runs.  It's
        not clear this code even does anything.  From Eric
        Wassenaar of the Dutch National Institute for Nuclear
        and High-Energy Physics.
    Fix some problems that caused queue runs to do "too much work",
        such as double-reading the Errors-To: header.  From
        Eric Wassenaar.
    Error messages on writing the temporary file (including the
        data file) were getting suppressed in SMTP -- this
        fix causes them to be properly reported.  From Eric
        Wassenaar.
    Some changes to support AF_UNIX sockets -- this will only
        really become relevant in the next release, but some
        people need it for local patches.  From Michael
        Corrigan of UC San Diego.
    Use dynamically allocated memory (instead of static buffers)
        for macros defined in initsys() and settime(); since
        these can have different values depending on which
        envelope they are in.  From Eric Wassenaar.
    Improve logging to show ctladdr on to= logging; this tells you
        what uid/gid processes ran as.
    Fix a problem that caused error messages to be discarded if
        the sender address was unparseable for some reason;
        this was supposed to fall back to the "return to
        postmaster" case.
    Improve aliaswait backoff algorithm.
    Portability patches for Linux (8.6.3 required another header
        file) (from Karl London) and SCO UNIX.
    CONFIG: patch prog mailer to not strip host name off of envelope
        addresses (so that it matches local again).  From
        Christopher Davis.
    CONFIG: change uucp-dom mailer so that "<>" translates to $n;
        this prevents uux from seeing lines with null names like
        ``From   Sat Oct 30 14:55:31 1993''.  From Motonori
        Nakamura of Kyoto University.
    CONFIG: handle <list:;> syntax correctly.  This isn't legal, but
        it shouldn't fail miserably.  From Motonori Nakamura.

8.6.2/8.6.2    93/10/15
    Put a "successful delivery" message in the transcript for
        addresses that get return-receipts.
    Put a prominent "this is only a warning" message in warning
        messages -- some people don't read carefully enough
        and end up sending the message several times.
    Include reason for temporary failure in the "warning" return
        message.  Currently, it just says "cannot send for
        four hours".
    Fix the "Original message received" time generated for
        returntosender messages.  It was previously listed as
        the current time.  Bug reported by Eric Hagberg of
        Cornell University Medical College.
    If there is an error when writing the body of a message,
        don't send the trailing dot and wait for a response
        in sender SMTP, as this could cause the connection to
        hang up under some bizarre circumstances.  From Eric
        Wassenaar.
    Fix some server SMTP synchronization problems caused when
        connections fail during message collection.  From
        Eric Wassenaar.
    Fix a problem that can cause srvrsmtp to reject mail if the
        name server is down -- it accepts the RCPT but rejects
        the DATA command.  Problem reported by Jim Murray of
        Stratus.
    Fix a problem that can cause core dumps if the config file
        incorrectly resolves to a null hostname.  Reported by
        Allan Johannesen of WPI.
    Non-root use of -C flag, dangerous -f flags, and use of -oQ
        by non-root users were not put into
        X-Authentication-Warning:s as intended because the
        config file hadn't set the PrivacyFlags yet.  Fix
        from Sven-Ove Westberg of the University of Lulea.
    Under very odd circumstances, the alias file rebuild code
        could get confused as to whether a database was
        open or not.
    Check "vendor code" on the end of V lines -- this is
        intended to provide a hook for vendor-specific
        configuration syntax.  (This is a "new feature",
        but I've made an exception to my rule in a belief
        that this is a highly exceptional case.)
    Portability fixes for DG/UX (from Douglas Anderson of NCSC),
        SCO Unix (from Murray Kucherawy), A/UX, and OSF/1
        (from Jon Forrest of UC Berkeley)
    CONFIG: fix ``mailer:host'' form of UUCP relay naming.

8.6.1/8.6    93/10/08
    Portability fixes for A/UX and Encore UMAX V.
    Fix error message handling -- if you had a name server down
        causing an error during parsing, that message was never
        propogated to the queue file.

8.6/8.6        93/10/05
    Configuration cleanup: make it easier to undo IDENTPROTO in
        conf.h (other systems have the same bug).
    If HASGETDTABLESIZE and _SC_OPEN_MAX are both defined, assume
        getdtablesize() instead of sysconf(); a disturbingly
        large number of systems defined _SC_OPEN_MAX in the
        header files but don't have the syscall.
    Another patch to really truly ignore MX records in getcanonname
        if trymx == FALSE.
    Fix problem that caused the "250 IAA25499 Message accepted for
        delivery" message to be omitted if there was an error
        in the header of the message (e.g., a bad Errors-To:
        line).  Pointed out by Michael Corrigan of UCSD.
    Announce name of host we are chatting when we get errors; this
        is an IDA-ism suggested by Christophe Wolfhugel.
    Portability fixes for Alpha OSF/1 (from Anthony Baxter of the
        Australian Artificial Intelligence Institute), SCO Unix
        (from Murray Kucherawy of Hookup Communication Corp.),
        NeXT (from Vince DeMarco and myself), Linux (from
        Karl London <[e-mail]>), BSDI (from
        Christophe Wolfhugel, and SVR4 on Dell (from Kimmo
        Suominen), AUX 3.0 on Macintosh, and ANSI C compilers.
    Some changes to get around gcc optimizer bugs.  From Takahiro
        Kanbe.
    Fix error recovery in queueup if another tf file of the same
        name already exists.  Problem stumbled over by Bill
        Wisner of The Well.
    Output YP_MASTER_NAME and YP_LAST_MODIFIED without null bytes.
        Problem noted by Keith McMillan of Ameritech Services.
    Deal with group permissions properly when opening .forward and
        :include: files.  This relaxes the 8.1C restrictions
        slightly more.  This includes proper setting of groups
        when reading :include: files, allowing you to read some
        files that you should be able to read but have previously
        been denied unless you owned them or they had "other"
        read permission.
    Make certain that $j is in $=w (after the .cf is read) so that
        if the user is forced to override some silly system,
        MX suppression will still work.
    Fix a couple of efficiency problems where newstr was double-
        calling expensive routines.  In at least one case, it
        wasn't guaranteed that they would always return the
        same result.  Problem noted by Christophe Wolfhugel.
    Fix null pointer dereference in putoutmsg -- only on an error
        condition from a non-SMTP mailer.  From Motonori
        Nakamura.
    Macro expand "C" line class definitions before scanning so that
        "CX $Z" works.
    Fix problem that caused error message to be sent while still
        trying to send the original message if the connection
        is closed during a DATA command after getting an error
        on an RCPT command (pretty obscure).  Problem reported
        by John Myers of CMU.
    Fix reply to NOOP to be 250 instead of 200 -- this is a long
        term bug.
    Fix a nasty bug causing core dumps when returning the "warning:
        cannot deliver for N hours -- will keep trying" message;
        it only occurred if you had PostMasterCopy set and
        only on some architectures.  Although sendmail would
        keep trying, it would send error messages on each
        queue interval.  This is an important fix.
    Allow u and g options to take user and group names respectively.
    Don't do a chdir into the queue directory in -bt mode to make
        ruleset testing a bit easier.
    Don't allow users to turn off logging (using -oL) on the command
        line -- command line can only raise, not lower, logging
        level.
    Set $u to the original recipient on the SMTP transaction or on
        the command line.  This is only done if there is exactly
        one recipient.  Technically, this does not meet the
        specs, because it does not guarantee a domain on the
        address.
    Fix a problem that dumped error messages on bad addresses if
        you used the -t flag.  Problem noted by Josh Smith of
        Harvey Mudd College.
    Given an address such as ``<foo> <bar>'', auto-quote the first
        ``<foo>'' part, giving ``"<foo>" <bar>''.  This is to
        avoid the problem of people who use angle brackets in
        their full name information.
    Fix a null pointer dereference if you set option "l", have
        an Errors-To: header in the message, and have Errors-To:
        defined in the config file H lines.  From J.R. Oldroyd.
    Put YPCOMPAT on #ifdef NIS instead -- it's one less thing to get
        wrong when compiling.  Suggested by Rick McCarty of TI.
    Fix a problem that could pass negative SIZE parameter if the
        df file got lost; this would cause servers to always
        give a temporary failure, making the problem even worse.
        Problem noted by Allan Johannesen of WPI.
    Add "ident" timeout (one of the "r" option selectors) for IDENT
        protocol timeouts (30s default).  Requested by Murray
        Kucherawy of HookUp Communication Corp. to handle bogus
        PC TCP/IP implementations.
    Change $w default definition to be just the first component of
        the domain name on config level 5.  The $j macro defaults
        to the FQDN; $m remains as before.  This lets well-behaved
        config files use any of the short, long, or subdomain
        names.
    Add makesendmail script in src to try to automate multi-architecture
        builds.  I know, this is sub-optimal, but it is still
        helpful.
    Fix very obscure race condition that can cause a queue run to
        get a queue file for an already completed job.  This
        problem has existed for years.  Problem noted by the
        long suffering Allan Johannesen of WPI.
    Fix a problem that caused the raw sender name to be passed to
        udbsender instead of the canonified name -- this caused
        it to sometimes miss records that it should have found.
    Relax check of name on HELO packet so that a program using -bs
        that claims to be itself works properly.
    Restore rewriting of $: part of address through 2, R, 4 in
        buildaddr -- this requires passing a lot of flags to get
        it right.  Unlike old versions, this ONLY rewrites
        recipient addresses, not sender addresses.
    Fix a bug that caused core dumps in config files that cannot
        resolve /file/name style addresses.  Fix from Jonathan
        Kamens of OpenVision Technologies.
    Fix problem with fcntl locking that can cause error returns to
        be lost if the lock is lost; this required fully
        queueing everything, dropping the envelope (so errors
        would get returned), and then re-reading the queue from
        scratch.
    Fix a problem that caused aliases that redefine an otherwise
        true address to still send to the original address
        if and only if the alias failed in certain bizarre
        ways (e.g, if they pointed at a list:; syntax address).
        Problem pointed out by Jonathan Kamens.
    Remove support for frozen configuration files.  They caused
        more trouble than it was worth.
    Fix problem that can cause error messages to get ignored when
        using both -odb and -t flags.  Problem noted by Rob
        McNicholas at U.C. Berkeley.
    Include all "normal" variations on hostname in $=w.  For example,
        if the host name is vangogh.cs.berkeley.edu, $=w will
        contain vangogh, vangogh.cs, and vangogh.cs.berkeley.edu.
    Add "restrictqrun" privacy flag -- without this, anyone can run
        the queue.
    Reset SmtpPhase global on initial connection creation so that
        messages don't come out with stale information.
    Pass an "ext" argument to lockfile so that error/log messages
        will properly reflect the true filename being locked.
    Put all [...] address forms into $=w -- this eliminates the need
        for MAXIPADDR in conf.h.  Suggested by John Gardiner
        Myers of CMU.
    Fix a bug that can cause qf files to be left around even after
        an SMTP RSET command.  Problem and fix from Michael
        Corrigan.
    Don't send a PostMasterCopy to errors when the Precedence: is
        negative.  Error reports still go to the envelope
        sender address.
    Add LA_SHORT for load averages.
    Lock sendmail.st file when posting statistics.
    Add "SendBufSize" and "RcvBufSize" suboptions to "O" option to
        set the size of the TCP send and receive buffers; if you
        run over a slow slip line you may need to set these down
        (although it would be better to fix the SLIP implementation
        so that it's not necessary to recompile every program
        that does bulk data transfer).
    Allow null defaults on $( ... $) lookups.  Problem reported by
        Amir Plivatsky.
    Diagnose crufty S and V config lines.  This resulted from an
        observation that some people were using the SITE macro
        without the SITECONFIG macro first, which was causing
        bogus config files that were not caught.
    Fix makemap -f flag to turn off case folding (it was turning it
        on instead).  THIS IS A USER VISIBLE CHANGE!!!
    Fix a problem that caused multiple error messages to be sent if
        you used "sendmail -t -oem -odb", your system uses fcntl
        locking, and one of the recipient addresses is unknown.
    Reset uid earlier in include() so that recursive .forwards or
        :include:s don't use the wrong uid.
    If file descriptor 0, 1, or 2 was closed when sendmail was
        called, the code to recover the descriptor was broken.
        This sometimes (only sometimes) caused problems with the
        alias file.  Fix from Motonori Nakamura.
    Fix a problem that caused aliaswait to go into infinite recursion
        if the @:@ metasymbol wasn't found in the alias file.
    Improve error message on newaliases if database files cannot be
        opened or if running with no database format defined.
    Do a better estimation of the size of error messages when NoReturn
        is set.  Problem noted by P{r (Pell) Emanuelsson.
    Fix a problem causing the "c" option (don't connect to expensive
        mailers) to be ignored in SMTP.  Problem noted and the
        solution suggested by Robert Elz of The University of
        Melbourne.
    Improve connection caching algorithm by passing "[host]" to
        hostsignature, which strips the square brackets and
        returns the real name.  This allows mailertable entries
        to match regular entries.
    Re-enable Return-Receipt-To: -- people seem to want this stupid
        feature, even if it doesn't work right.
    Catch and log attempts to try the "wiz" command in server SMTP.
        This also ups the log level from LOG_NOTICE to LOG_CRIT.
    Be more generous at assigning $z to the home directory -- do this
        for programs that are specified through a .forward file.
        Fix from Andrew Chang of Sun Microsystems.
    Always save a fatal error message in preference to a non-fatal
        error message so that the "subject" line of return
        messages is the best possible.
    CONFIG: reduce the number of quotes needed to quote configuration
        parameters with commas: two quotes should work now, e.g.,
        define(ALIAS_FILE, ``/etc/aliases,/etc/aliases.local'').
    CONFIG: class $=Z is a set of UUCP hosts that use uucp-dom
        connections (domain-ized UUCP).
    CONFIG: fix bug in default maps (-o must be before database file
        name).  Pointed out by Christophe Wolfhugel.
    CONFIG: add FEATURE(nodns) to state that we are not relying on
        DNS.  This would presumably be used in UUCP islands.
    CONFIG: add OSTYPE(nextstep) and OSTYPE(linux).
    CONFIG: log $u in Received: line.  This is in technical violation
        of the standards, since it doesn't guarantee a domain
        on the address.
    CONFIG: don't assume "m" in local mailer flags -- this means that
        if you redefine LOCAL_MAILER_FLAGS you will have to include
        the "m" flag should you want it.  Apparently some Solaris 2.2
        installations can't handle multiple local recipients.
        Problem noted by Josh Smith.
    CONFIG: add confDOMAIN_NAME to set $j (if undefined, $j defaults).
    CONFIG: change default version level from 4 to 5.
    CONFIG: add FEATURE(nullclient) to create a config file that
        forwards all mail to a hub without ever looking at the
        addresses in any detail.
    CONFIG: properly strip mailer: information off of relays when
        used to change .BITNET form into %-hack form.
    CONFIG: fix a problem that caused infinite loops if presented
        with an address such as "!foo".
    CONFIG: check for self literal (e.g., [128.32.131.12]) even if
        the reverse "PTR" mapping is broken.  There's a better
        way to do this, but the change is fairly major and I
        want to hold it for another release.  Problem noted by
        Bret Marquis.

8.5/8.5        93/07/23
    Serious bug: if you used a command line recipient that was unknown
        sendmail would not send a return message (it was treating
        everything as though it had an SMTP-style client that
        would do the return itself).  Problem noted by Josh Smith.
    Change "trymx" option in getcanonname() to ignore all MX data,
        even during a T_ANY query.  This actually didn't break
        anything, because the only time you called getcanonname
        with !trymx was if you already knew there were no MX
        records, but it is somewhat cleaner.  From Motonori
        Nakamura.
    Don't call getcanonname from getmxrr if you already know there
        are no DNS records matching the name.
    Fix a problem causing error messages to always include "The
        original message was received ... from localhost".
        The correct original host information is now included.
    Previous change to cf/sh/makeinfo.sh doesn't port to Ultrix (their
        version of "test" doesn't have the -x flag).  Change it
        to use -f instead.  From John Myers.
    CONFIG: 8.4 mistakenly set the default SMTP-style mailer to
        esmtp -- it should be smtp.
    CONFIG: send all relayed mail using confRELAY_MAILER (defaults
        to "relay" (a variant of "smtp") if MAILER(smtp) is used,
        else "suucp" if MAILER(uucp) is used, else "unknown");
        this cleans up the configs somewhat.  This fixes a serious
        problem that caused route-addrs to get mistaken as relays,
        pointed out by John Myers.  WARNING: this also causes
        the default on SMART_HOST to change from "suucp" to
        "relay" if you have MAILER(smtp) specified.

8.4/8.4        93/07/22
    Add option `w'.  If you receive a message that comes to you because
        you are the best (lowest preference) target of an MX, and
        you haven't explicitly recognized the source MX host in
        your .cf file, this option will cause you to try the target
        host directly (as if there were no MX for it at all).  If
        `w' is not set, this case is a configuration error.
        Beware: if `w' is set, senders may get bogus errors like
        "message timed out" or "host unknown" for problems that
        are really configuration errors.  This option is
        disrecommended, provided only for compatibility with
        UIUC sendmail.
    Fix a problem that caused the incoming socket to be left open
        when sendmail forks after the DATA command.  This caused
        calling systems to wait in FIN_WAIT_2 state until the
        entire list was processed and the child closed -- a
        potentially prodigious amount of time.  Problem noted
        by Neil Rickert.
    Fix problem (created in 6.64) that caused mail sent to multiple
        addresses, one of which was a bad address, to completely
        suppress the sending of the message.  This changes
        handling of EF_FATALERRS somewhat, and adds an
        EF_GLOBALERRS flag.  This also fixes a potential problem
        with duplicate error messages if there is a syntax error
        in the header of a message that isn't noticed until late
        in processing.  Original problem pointed out by Josh Smith
        of Harvey Mudd College.  This release includes quite a bit
        of dickering with error handling (see below).
    Back out SMTP transaction if MAIL gets nested 501 error.  This
        will only hurt already-broken software and should help
        humans.
    Fix a problem that broke aliases when neither NDBM nor NEWDB were
        compiled in.  It would never read the alias file.
    Repair unbalanced `)' and `>' (the "open" versions are already
        repaired).
    Logging of "done" in dropenvelope() was incorrect: it would
        log this even when the queue file still existed.  Change
        this to only log "done" (at log level 11) when the
        queue file is actually removed.  From John Myers.
    Log "lost connection" in server SMTP at log level 20 if there
        is no pending transaction.  Some senders just close the
        connection rather than sending QUIT.
    Fix a bug causing getmxrr to add a dot to the end of unqualified
        domains that do not have MX records -- this would cause
        the subsequent host name lookup to fail.  The problem
        only occurred if you had FEATURE(nocanonify) set.
        Problem noted by Rick McCarty of Texas Instruments.
    Fix invocation of setvbuf when passed a -X flag -- I had
        unwittingly used an ANSI C extension, and this caused
        core dumps on some machines.
    Diagnose self-destructive alias loops on RCPT as well as EXPN.
        Previously it just gave an empty send queue, which
        then gave either "Need RCPT (recipient)" at the DATA
        (confusing, since you had given an RCPT command which
        returned 250) or just dropped the email, depending on
        whether you were running VERBose mode.  Now it usually
        diagnoses this case as "aliasing/forwarding loop broken".
        Unfortunately, it still doesn't adequately diagnose
        some true error conditions.
    Add internal concept of "warning messages" using 6xx codes.
        These are not reported only to Postmaster.  Unbalanced
        parens, brackets, and quotes are printed as 653 codes.
        They are always mapped to 5xx codes before use in SMTP.
    Clean up error messages to tell both the actual address that
        failed and the alias they arose from.  This makes it
        somewhat easier to diagnose problems.  Difficulty noted
        by Motonori Nakamura.
    Fix a problem that inappropriately added a ctladdr to addresses
        that shouldn't have had one during a queue run.  This
        caused error messages to be handled differently during
        a queue run than a direct run.
    Don't print the qf name and line number if you get errors during
        the direct run of the queue from srvrsmtp -- this was
        just extra stuff for users to crawl through.
    Put command line flags on second line of pid file so you can
        auto-restart the daemon with all appropriate arguments.
        Use "kill `head -1 /etc/sendmail.pid`" to stop the
        daemon, and "eval `tail -1 /etc/sendmail.pid`" to
        restart it.
    Remove the ``setuid(getuid())'' in main -- this caused the
        IDENT daemon to screw up.  This required that I change
        HASSETEUID to HASSETREUID and complicate the mode
        changing somewhat because both Ultrix and SunOS seem
        to have a bug causing seteuid() to set the saved uid
        as well as the effective.  The program test/t_setreuid.c
        will test to see if your implementation of setreuid(2)
        is appropriately functional.
    The FallBackMX (option V) handling failed to properly identify
        fallback to yourself -- most of the code was there,
        but it wasn't being enabled.  Problem noted by Murray
        Kucherawy of the University of Waterloo.
    Change :include: open timeout from ETIMEDOUT to an internal
        code EOPENTIMEOUT; this avoids adding "during SmtpPhase
        with CurHostName" in error messages, which can be
        confusing.  Reported by Jonathan Kamens of OpenVision
        Technologies.
    Back out setpgrp (setpgid on POSIX systems) call to reset the
        process group id.  The original fix was to get around
        some problems with recalcitrant MUAs, but it breaks
        any call from a shell that creates a process group id
        different from the process id.  I could try to fix
        this by diddling the tty owner (using tcsetpgrp or
        equivalent) but this is too likely to break other
        things.
    Portability changes:
        Support -M as equivalent to -oM on Ultrix -- apparently
            DECnet calls sendmail with -MrDECnet -Ms<HOST> -bs
            instead of using standard flags.  Oh joy.  This
            behaviour reported by Jon Giltner of University
            of Colorado.
        SGI IRIX  -- this includes several changes that should
            help other strict ANSI compilers.
        SCO Unix -- from Murray Kucherawy of HookUp Communication
            Corporation.
        Solaris running the Sun C compiler (which despite the
            documentation apparently doesn't define
            __STDC__ by default).
        ConvexOS from Eric Schnoebelen of Convex.
        Sony NEWS workstations and Omron LUNA workstations from
            Motonori Nakamura.
    CONFIG: add confTRY_NULL_MX_LIST to set option `w'.
    CONFIG: delete `C' and `e' from default SMTP mailers flags;
        several people have made a good argument that this
        creates more problems than it solves (although this
        may prove painful in the short run).
    CONFIG: generalize all the relays to accept a "mailer:host"
        format.
    CONFIG: move local processing in ruleset 0 into a new ruleset
        98 (8 on old sendmail).  Domain literal [a.b.c.d]
        addresses are also passed through this ruleset.
    CONFIG: if neither SMART_HOST nor MAILER(smtp) were defined,
        internet-style addresses would "fall off the end" of
        ruleset zero and be interpreted as local -- however,
        the angle brackets confused the recursive call.
        These are now diagnosed as "Unrecognized host name".
    CONFIG: USENET rules weren't included in S0 because of a mistaken
        ifdef(`_MAILER_USENET_') instead of
        ifdef(`_MAILER_usenet_').  Problem found by Rein Tollevik
        of SINTEF RUNIT, Oslo.
    CONFIG: move up LOCAL_RULE_0 processing so that it happens very
        early in ruleset 0; this allows .mc authors to bypass
        things like the "short circuit" code for local addresses.
        Prompted by a comment by Bill Wisner of The Well.
    CONFIG: add confSMTP_MAILER to define the mailer used (smtp or
        esmtp) to send SMTP mail.  This allows you to default
        to esmtp but use a mailertable or other override to
        deal with broken servers.  This logic was pointed out
        to me by Bill Wisner.  Ditto for confLOCAL_MAILER.
    Changes to cf/sh/makeinfo.sh to make it portable to SVR4
        environments.  Ugly as sin.

8.3/8.3        93/07/13
    Fix setuid problems introduced in 8.2 that caused messages
        like "Cannot create qfXXXXXX: Invalid argument"
        or "Cannot reopen dfXXXXXX: Permission denied".  This
        involved a new compile flag "HASSETEUID" that takes
        the place of the old _POSIX_SAVED_IDS -- it turns out
        that the POSIX interface is broken enough to break
        some systems badly.  This includes some fixes for
        HP-UX.  Also fixes problems where the real uid is
        not reset properly on startup (from Neil Rickert).
    Fix a problem that caused timed out messages to not report the
        addresses that timed out.  Error messages are also more
        "user friendly".
    Drop required bandwidth on connections from 64 bytes/sec to
        16 bytes/sec.
    Further Solaris portability changes -- doesn't require the BSD
        compatibility library.  This also adds a new
        "HASGETDTABLESIZE" compile flag which can be used if
        you want to use getdtablesize(2) instead of sysconf(2).
        These are loosely based on changes from David Meyer at
        University of Oregon.  This now seems to work, at least
        for quick test cases.
    Fix a problem that can cause duplicate error messages to be
        sent if you are in SMTP, you send to multiple addresses,
        and at least one of those addresses is good and points
        to an account that has a .forward file (whew!).
    Fix a problem causing messages to be discarded if checkcompat()
        returned EX_TEMPFAIL (because it didn't properly mark
        the "to" address).  Problem noted by John Myers.
    Fix dfopen to return NULL if the open failed; I was depending
        on fdopen(-1) returning NULL, which isn't the case.  This
        isn't serious, but does result in weird error diagnoses.
        From Michael Corrigan.
    CONFIG: add UUCP_MAX_SIZE M4 macro to set the maximum size of
        messages sent through UUCP-family mailers.  Suggested
        by Bill Wisner of The Well.
    CONFIG: if both MAILER(uucp) and MAILER(smtp) are specified,
        include a "uucp-dom" mailer that uses domain-style
        addressing.  Suggested by Bill Wisner.
    CONFIG: Add LOCAL_SHELL_FLAGS and LOCAL_SHELL_ARGS to match
        LOCAL_MAILER_FLAGS and LOCAL_MAILER_ARGS.  Suggested by
        Christophe Wolfhugel.
    CONFIG: Add OSTYPE(aix3).  From Christophe Wolfhugel.

8.2/8.2        93/07/11
    Don't drop out on config file parse errors in -bt mode.
    On older configuration files, assume option "l" (use Errors-To
        header) for back compatibility.  NOTE:  this DOES NOT
        imply an endorsement of the Errors-To: header in any way.
    Accept -x flag on AIX-3 as well as OSF/1.  Why, why, why???
    Don't log errors on EHLO -- it isn't a "real" error for an old
        SMTP server to give an error on this command, and
        logging it in the transcript can be confusing.  Fix
        from Bill Wisner.
    IRIX compatibility changes provided by Dan Rich
        <[e-mail]>.
    Solaris 2 compatibility changes.  Provided by Bob Cunningham
        <[e-mail]>, John Oleynick
        <[e-mail]>
    Debugging: -d17 was overloaded (hostsignature and usersmtp.c);
        move usersmtp (smtpinit and smtpmailfrom) to -d18 to
        match the other flags in that file.
    Flush transcript before fork in mailfile().  From Eric Wassenaar.
    Save h_errno in mci struct and improve error message display.
        Changes from Eric Wassenaar.
    Open /dev/null for the transcript if the create of the xf file
        failed; this avoids at least one possible null pointer
        reference in very weird cases.  From Eric Wassenaar.
    Clean up statistics gathering; it was over-reporting because of
        forks.  From Eric Wassenaar.
    Fix problem that causes old Return-Path: line to override new
        Return-Path: line (conf.c needs H_FORCE to avoid
        re-using old value).  From Motonori Nakamura.
    Fix broken -m flag in K definition -- even if -m (match only)
        was specified, it would still replace the key with the
        value.  Noted by Rick McCarty of Texas Instruments.
    If the name server timed out over several days, no "timed out"
        message would ever be sent back.  The timeout code
        has been moved from markfailure() to dropenvelope()
        so that all such failures should be diagnosted.  Pointed
        out by Christophe Wolfhugel and others.
    Relax safefile() constraints: directories in an include or
        forward path must be readable by self if the controlling
        user owns the entry, readable by all otherwise (e.g.,
        when reading your .forward file, you have to own and
        have X permssion in it; everyone needs X permission in
        the root and directories leading up to your home);
        include files must be readable by anyone, but need not
        be owned by you.
    If _POSIX_SAVED_IDS is defined, setuid to the owner before
        reading a .forward file; this gets around some problems
        on NFS mounts if root permission is not exported and
        the user's home directory isn't x'able.
    Additional NeXT portability enhancements from Axel Zinser.
    Additional HP-UX portability enhancements from Brian Bullen.
    Add a timeout around SMTP message writes; this assumes you can
        get throughput of at least 64 bytes/second.  Note that
        this does not impact the "datafinal" default, which
        is separate; this is just intended to work around
        network clogs that will occur before the final dot
        is sent.  From Eric Wassenaar.
    Change map code to set the "include null" flag adaptively --
        it initially tries both, but if it finds anything
        matching without a null it never tries again with a
        null and vice versa.  If -N is specified, it never
        tries without the null and creates new maps with a
        null byte.  If -O is specified, it never tries with
        the null (for efficiency).  If -N and -O are specified,
        you get -NO (get it?) lookup at all, so this would
        be a bad idea.  If you don't specify either -N or -O,
        it adapts.
    Fix recognition of "same from address" so that MH submissions
        will insert the appropriate full name information;
        this used to work and got broken somewhere along the
        way.
    Some changes to eliminate some unnecessary SYSERRs in the
        log.  For example, if you lost a connection, don't
        bother reporting that fact on the connection you lost.
    Add some "extended debugging" flags to try to track down
        why we get occassional problems with file descriptor
        one being closed when execing a mailer; it seems to
        only happen when there has been another error in the
        same transaction.  This requires XDEBUG, defined
        by default in conf.h.
    Add "-X filename" command line flag, which logs both sides of
        all SMTP transactions.  This is intended ONLY for
        debugging bad implementations of other mailers; start
        it up, send a message from a mailer that is failing,
        and then kill it off and examine the indicated log.
        This output is not intended to be particularly human
        readable.  This also adds the HASSETVBUF compile
        flag, defaulted on if your compiler defines __STDC__.
    CONFIG: change SMART_HOST to override an SMTP mailer.  If you
        have a local net that should get direct connects, you
        will need to use LOCAL_NET_CONFIG to catch these hosts.
        See cf/README for an example.
    CONFIG: add LOCAL_MAILER_ARGS (default: `mail -d $u') to handle
        sites that don't use the -d flag.
    CONFIG: hide recipient addresses as well as sender addresses
        behind $M if FEATURE(allmasquerade) is specified; this
        has been requested by several people, but can break
        local aliases.  For example, if you mail to "localalias"
        this will be rewritten as "localalias@masqueradehost";
        although initial delivery will work, replies will be
        broken.  Use it sparingly.
    CONFIG: add FEATURE(domaintable).  This maps unqualified domains
        to qualified domains in headers.  I believe this is
        largely equivalent to the IDA feature of the same name.
    CONFIG: use $U as UUCP name instead of $k.  This permits you
        to override the "system name" as your UUCP name --
        in particular, to use domain-ized UUCP names.  From
        Bill Wisner of The Well.
    CONFIG: create new mailer "esmtp" that always tries EHLO
        first.  This is currently unused in the config files,
        but could be used in a mailertable entry.

8.1C/8.1B    93/06/27
    Serious security bug fix: it was possible to read any file on
        the system, regardless of ownership and permissions.
    If a subroutine returns a fully qualified address, return it
        immediately instead of feeding it back into rewriting.
        This fixes a problem with mailertable lookups.
    CONFIG: fix some M4 frotz (concat => CONCAT)

8.1B/8.1A    93/06/12
    Serious bug fix: pattern matching backup algorithm stepped by
        two tokens in classes instead of one.  Found by Claus
        Assmann at University of Kiel, Germany.

8.1A/8.1A    93/06/08
    Another mailertable fix....

8.1/8.1        93/06/07
    4.4BSD freeze.  No semantic changes.

6.65/6.34    93/06/06
    Fix some lintish problems.
    Fix some cases where server SMTP behaved poorly when handed bogus
        input, pointed out by Eric Wassenaar.
    CONFIG: fix some more (sigh) mailertable bugs -- thanks to
        Motonori Nakamura of Kyoto University (again).

6.64/6.33    93/06/05
    Don't send 050 (-v) information after the 250 response to a QUIT
        command in srvrsmtp -- clients usually close the connection
        at this point, and it causes bogus error messages.
    Don't send messages that have errors on input (such as unbalanced
        parentheses) during SMTP transactions, since a return
        message has (probably) already been sent.
    Give better diagnostics on timeouts during network reads, including
        information similar to the SMTP phase.
    Fix bug that caused SMTP messages to deliver synchronously; this
        happened after the DATA 250, and hence caused reading the
        next command to be delayed.
    Ignore Errors-To: header unless 'l' (lower case el) header is
        specified.  The Errors-To: header violates RFC 1123.
        Errors-To: was only needed to take the place of the
        envelope sender in the days when most Unix mailers
        didn't understand about the two kinds of senders.
    Don't send warning messages in response to automatically generated
        messages (that is, those From:<>).
    CONFIG: fix some rather stupid typos in the mailertable code
        pointed out by Motonori Nakamura of Kyoto University.
    CONFIG: add confUSE_ERRORS_TO configuration option.
    CONFIG: if ALWAYS_ADD_DOMAIN is selected, try to use $M
        (masquerade name) instead of $j.
    CONFIG: don't add dots to relay names (added in 6.29); it breaks
        several things, and can be simulated by dot terminating
        the names of relays.  For example, use:
            DBbit.net.relay.
        (note the trailing dot).

6.63/6.32    93/06/01
    Fix prototypes to eliminate chars in argument lists -- some
        compilers are pissy about this.
    Log protocol ($r) and body type if set so we can determine if
        the adaptive algorithms are working.
    Pessimize on locking of database files (particularly for NEWDB
        databases) during opens.  There were problems with
        processes opening the file while it was rebuilt; since
        NEWDB caches heavily, the reader opened an empty file,
        which is an error.  If your system has the ability to
        lock atomically on open, this works properly; otherwise,
        there are race conditions.
    Check mod time on .pag file instead of .dir in NDBM aliases
        because the .dir file doesn't get updated for small
        alias files.  From John Gardiner Myers of CMU.
    More Solaris portability -- it now compiles on Solaris, but
        hangs up in gethostbyname().
    Move setting of RES_DEBUG flag before first myhostname() call
        so we can see name server traffic on that call.
    Fsync() queue files.
    Fix a problem that causes -bi to try to rebuild maps other than
        the alias file(s).
    Fix a problem that caused udb to reject entries from any but
        the first database listed.
    Rearrange doc subdirectory for 4.4BSD release tape.
    CONFIG: put $r into the Received line.  This was an oversight.
    CONFIG: fix typo (call to ruleset 99 should have been rulset 90).
    CONFIG: move "auxiliary" subroutines to be in ruleset 90-99
        range -- in the long run, single digit rulesets may
        become reserved for builtin use by sendmail.
    CONFIG: fix major problem that causes host aliases (that is,
        anything in $=w != $j) to not be recognized.  This has
        been around since 6.30.

6.62/6.31    93/05/28
    BETA RELEASE
    Fix recursive syserr (if there is an error printing a syserr
        message).  This makes the code much less eager to consider
        a write error as serious.  This also includes some
        heuristics to be clever about closed connections.
    Lock NEWDB files during gets.  This requires version 1.5 or later
        of the db library.  If you have an older version, you
        can use -DOLD_NEWDB.  This will go away in a few weeks.
    Fix problem causing aliases that use host maps to get overwritten.
    Do appropriate byte swapping on port numbers in ident protocol
        code.  Fix from Allan Johannesen of WPI.
    Defer opening of map files to the same time as alias files so that
        the daemon will tend to pick up new versions more promptly.
    Prototype a bunch more functions.
    Some Solaris 2.1 changes (still doesn't link though).
    Try to simplify Makefiles by including more subordinate #defines
        in conf.h (based on OS type).
    CONFIG: check for domains if FEATURE(mailertable) is defined.
        For example, if the host name is "knecht.cs.berkeley.edu"
        it will search the following mailertable keys:
            knecht.cs.berkeley.edu
            .cs.berkeley.edu
            .berkeley.edu
            .edu
        This could be used to replace the special relays for bitnet
        and similar nets.

6.61/6.30    93/05/24
    Fix problem that prevented appending dots on canonified host
        names.  This breaks tons of config files -- very
        important fix.
    Fix improper pointer dereference in response to HELO command.
    Fix core dump if debugging set in map_rewrite.
    CONFIG: add FEATURE(always_add_domain) to always attach the
        local domain (only impacts local mail).
    CONFIG: try to avoid turning names into $j -- although
        technically a host can only have one "canonical name",
        it seems to be common practice to have several.

6.60/6.29    93/05/22
    Major change: merge alias databases with maps.  This expands and
        changes the map class interface but fixes a bunch of bugs.
        The important user-visible change is that the file name
        in a K line now does not include the ".db" extension; this
        is added automatically.  Also, the -d (NIS domain) flag is
        missing from the K config line; use @domain instead.
        When compiling, the *_MAP names are gone -- just compile
        in NDBM, NEWDB, and/or NIS support.
    Announce mailer/host/user triple on -bv flag -- from Brian
        Bullen of Stirling University.
    Don't send more than one line in response to HELO -- it confuses
        Pony Express, which then behaves very badly.  However,
        this change does send two line 220 greetings, with the
        second line reading "ESMTP spoken here".  The usersmtp
        module recognizes this and goes into ESMTP mode regardless
        of the setting of the "a" mailer flag.  Thus, "a" means
        "always try EHLO".
    AIX portability changes (thanks to Christophe Wolfhugel of
        Herve Schauer Consultants (Paris) for providing me with
        an INSA account for this purpose).  Lightly tested.  Use
        -D_AIX3.  This probably breaks compatibility with some
        older systems (e.g., 4.2bsd) but still works on SunOS
        4.1.2, Ultrix 4.2A, HP-UX 8.07, OSF/1 T1.3, and AIX 3.2.3.
    Fix a problem causing an error message loop if the output channel
        is hosed.
    Add the Makefiles that I use for various environments -- some are
        Berkeley make versions and some are old make versions.
        My makefile for the NeXT box has gotten lost, alas!
    PRALIASES: support for printing NEWDB databases.  From
        Michael J. Corrigan of U.C. San Diego.
    CONFIG: don't pass pseudo-domains to $[ ... $] (if you have
        a wildcard MX it can have weird results).  From
        Christophe Wolfhugel.
    CONFIG: dot terminate relay hostnames in S0.  From Christophe
        Wolfhugel.

6.59/6.28    93/05/13
    Log version with SMTP daemon startup message.
    Adjust setproctitle to work on NetBSD and BSD/386.
    Fix null pointer reference in MX fallback code.
    A bunch of minor fixes from Eric Wassenaar:
        If deliver cannot execv the mailer, return EX_OSERR
            instead of EX_TEMPFAIL (to give better
            error messages).
        Consistently malloc e_message.
        Catch degenerate case of calling returntosender()
            with an empty returnq.
        MIME reformatting.

6.58/6.28    93/05/13
    Fix bug that can cause incorrect verbose display of user smtp
        messages.
    Disable SMTP VERB command if PRIV_NOEXPN is set (since this
        could reveal the same information.
    Allow failure when reading SMTP greeting message to go on to
        next MX host.
    Add "MIME-Version: 1.0" header if using MIME (this was NOT
        included in RFC 1344, but Bill King of Allan-Bradley
        Company forwarded me email from Nathaniel Borenstein
        claiming that it was an inadvertent omission).
    Don't use Content-Type: X-message-header.  According to John
        Myers of CMU, many MIME readers will completely ignore
        the data if they don't recognize it.  Instead, just
        add a blank line to make it a legal (empty) message.
    Fix problem causing dots to keep getting appended to cached
        hostnames.  This can cause buffer overrun conditions.
        The problem was found by Erik Forsberg of Retix,
        although I used a different bug fix than he provided.
    Fix parsing of split header/envelope rewriting specs -- from
        Eric Forsberg.
    Fix from Eric Wassenaar to correct To: lists in error messages.

6.57/6.28    93/05/11
    Fix minor glitch causing extra ctladdrs to be output to queue
        file.  Just an annoyance.
    Cache results of name server canonification lookups to avoid
        backed up queue runs.
    Major rewrite of alias.c: considerable cleanup, plus sample
        (untested) support for NIS aliases.  The "A" option
        can now be a comma separated list (or be repeated) --
        that is, you can have multiple alias databases.  Each
        database can have the syntax ``class:file''; if no class
        is specified, the "implicit" class is assumed.  Implicit
        searches through a list of compiled in types -- hash,
        dbm, nis, and stab.  Alias files are searched in the
        order they are listed.  For example:
            OAhash:/etc/aliases.local,/etc/aliases
            OAnis:[e-mail]
        first searches the hash database /etc/aliases.local,
        then the regular /etc/aliases database, then the NIS
        map "mail.aliases" in the NIS domain "my.nis.domain".
    If in Verbose mode (probably from VERB command) run SMTP job
        in foreground and don't do RCPT optimizations.
    Add udb :mailsender as equivalent to owner- for regular aliases.
    Delete option 8; add option 7 that means the opposite.  That is,
        default to 8-bit mode; a special option is needed to
        force sendmail into 7 bit mode.
    Send error messages in encapsulated MIME format.
    New compile flag "NIS" that turns on NIS alias and NIS map
        support.
    Add "j" option to send error messages in MIME (RFC 1341)
        encapsulated message format per RFC 1344.  The
        syntax is pretty ugly if you don't have MIME-aware
        user agents.
    Clean up message handling (for display in mailq output).
    New setproctitle implementation for 4.4bsd.
    Create files (such as ~/dead.letter) using mode FileMode (the
        F option value) instead of 0666.
    Fix bug causing output of EXPN command to not be fully qualified.
        This may cause some problems with UUCP addresses that
        will require some config file assistance -- specifically,
        the $: part has to include the host name for this output
        to make sense.
    Fix a problem that sometimes diagnosed errors and still sent the
        message if the header syntax was bad.
    Fix a bug that caused an error message to be emailed when sendmail
        was operating in -bv mode.
    Add "ListenQueueSize" keyword to daemon options option (OO) to
        set the queue size parameter passed to listen().  You
        will normally have to tweak your kernel to up this.
    Strip spaces off of beginning of message-id before logging (in
        case it was folded across lines).
    Tweak compile flags in daemon.c -- there were some cases where
        it wouldn't work without NETINET.
    Change *file* mailer to output all the usual default headers
        (From, Date, Message-Id).  It gets used when sending
        back error messages.
    CONFIG: explicitly catch and diagnose list:; syntax in ruleset
        zero -- this is not a valid recipient syntax according
        to RFC 821.
    CONFIG: add confMIME_FORMAT_ERRORS to send error messages in
        MIME format.  Defaults to on.
    CONFIG: add SMTP_MAILER_FLAGS and UUCP_MAILER_FLAGS to augment
        the flags for those mailers.

6.56/6.27    93/05/01
    Fix problem that causes the fallback mail to postmaster
        (case ESM_POSTMASTER in savemail()) to not look at
        aliases (ugh).
    Some more HPUX tweaking (compile flag hpux => __hpux so it
        still works in ANSI mode).
    Don't try to flock non-regular files when mailing to a file.
        In particular, this was a problem if you tried to
        send to /dev/null.
    Fix a weird bug that can cause senders to be queued as
        recipients if the name server is down when the mail
        is initially sent.  This hack just ignores sender
        deletion (essentially, it sets the MeToo flag) if there
        is a TEMPFAIL during processing of the sender address.
        Obscure.
    Fix a dangling else problem -- from Brian Bullen from University
        of Stirling, UK.
    Add the "b" mailer flag to force a blank line on the end of
        messages.  Some brilliant versions of /bin/mail insist
        on this but do not add it themselves.
    Add the "g" mailer flag to prevent user SMTP from sending
        "MAIL From:<>".  This is only intended to be a
        transitional gesture, and should not be used if at
        all possible.  It appears that Berkeley and IDA
        config files have always handled this properly; the
        UK config kit apparently does not.
    Don't lowercase and then capitalize header field names -- leave
        them with original capitalization.  Fixes from Bill
        King of Allen-Bradley Company.
    Further cleanup and improved reporting of error messages,
        particularly conditions that cause messages to be
        requeued for future delivery.
    Tweak syslog priorities in some cases.
    CONFIG: clean up route-addr on UUCP addresses.

6.55/6.25    93/04/27
    HPUX 8.07 compatibility changes in getla() -- I had to make
        these changes to get it to work at Berkeley, although
        others seem to have been working before (???).
    Various patches to XLA code.
    Fix problem that causes setuid bit on files to be ignored from
        SMTP or in queue runs.  Problem noted by Jason Ornstein
        of Under The Wire, Inc.
    Fix problem that can cause CNAMEs to be ignored.
    Generalize getmxrr to match local host in $=w instead of a
        single name passed in.
    Some cleanup from Eric Wassenaar:
        Use FileMailer instead of ProgMailer in two places.
        Eliminate duplicate 8th-bit stripping in commaize.
        Fix a problem with mis-parsing of backslash escapes
            under some circumstances.
    NIS map fix (was always including trailing null character)
        from Mike Glendinning of Ingres UK.
    Add "a" mailer flag to try using ESMTP.  It tries the EHLO
        command and if that fails falls back to regular SMTP.
        Also parses EHLO option keywords.  If host supports
        SIZE extension, this is added to the MAIL FROM:
        command.
    Extend "b" option to include a second value which is the
        maximum message size this server is willing to accept.
        For example, a value of "10/1000000" says that there
        must be ten blocks free, and sendmail will reject
        any message larger than one megabyte.
    Some portability hooks for NeXT (this could be applicable
        to Mach in general).  You have to create an empty
        file called "unistd.h" to get it to compile.
    Adjust config values (MAXLINE, MAXATOM, and PSBUFSIZE) to
        be more generous.
    Add X400-Received: to the list of headers tagged with H_TRACE
        in conf.c.  From Bill King, Allen-Bradley Co.

6.54/6.25    93/04/19
    Fix problem that caused redefinition of SMTP and QUEUE compile
        flags.  Pointed out by Jon Forrest of the Sequoia 2000
        project at Berkeley.
    Properly handle \! hack -- it was treating host\!user as one
        token (host!user) instead of three (host, !, user).
        Fix from Eric Wassenaar of NIKHEF-H.
    Fix compilation problem in getauthinfo() if IDENTPROTO is off.
    Turn off DEFNAMES and DNSRCH when getting the hostsignature
        (i.e., MX records) in level 1 configuration files; this
        matches the old behaviour.  From Motonori Nakamura of
        Kyoto University.
    Improve error message printing -- if sent through an alias,
        error messages include the name of the alias in the
        message.  Unfortunately, in order to make this work
        properly in queue runs, this changes the format of the
        C line in the qf file.  The relatively uselessness of
        the previous information was pointed out to me by
        Allan E Johannesen of WPI.
    Add XLA compile flag to add hooks to Christophe Wolfhugel's
        extended load average code.  This is still in very early
        form.  For information regarding the guts of the xla
        code, contact [e-mail].
    Additional hooks for detecting tempfails in rewriting rules
        (that is, in map lookups).

6.53/6.25    93/04/15
    Properly diagnose ruleset zero returning null (instead of a mailer
        triple).  From Motonori Nakamura of Kyoto University.
    More generalization of socket code for other protocols.
    Shorten timeouts on reverse name lookups -- since they are done
        during connection establishment, long timeouts here can
        cause higher level timeouts.  This mainly serves to accept
        mail from hosts that do not have proper reverse (PTR) DNS
        records set up.
    Reset e_statmsg before each mailer invocation to avoid bogus
        messages in the log.
    Redefine $r, $s, and $_ in error envelopes so you don't get
        incorrect cruft in the error message.  Problem noted by
        Motonori Nakamura of Kyoto University.
    Fix a problem that can cause failure to return errors to Postmaster
        in certain cases.  From Motonori Nakamura.
    Fix a problem that can cause some systems to give duplicate error
        messages when a bad syntax address such as "<a" is presented
        to an SMTP server.   It doesn't seem to occur on all
        machines.  From Motonori Nakamura.
    Default IDENTPROTO off for Ultrix and HPUX, which apparently have
        the interesting "feature" that when they receive a "Host
        unreachable" message they closes all open connections to
        that host.  However, some firewall gateways send this message
        if you try to connect to an unauthorized port, such as the
        IDENT port (113).  Thus, no email can be received from such
        hosts.  There is some evidence that versions of Ultrix before
        4.3 do not have this problem.  Thanks to Tom Ivar Helbekkmo
        for pointing out this behaviour to me and to Michael Corrigan
        of U.C. San Diego for informing me about the HPUX problem.
    Allow IPC mailers to return a colon-separated list of hosts in the
        $@ clause; these are searched in order as though they were
        MX records.
    When sending an error report, print the list of addresses tagged
        as bad.  Requested by Allan E Johannesen of WPI.
    Change map function calls to return a status code.  This gets
        passed back as the result of rewrite.  Parseaddr marks
        the address as a QUEUEUP address if the return code is
        EX_TEMPFAIL.  All this to queue properly if the name
        server is down.  This code is not well tested.  This code
        changes the interface to map lookup functions (a fifth
        parameter, int *statp, is added).  Feature requested by
        Dan Oscarsson.
    Don't delete quotes (in the dequote map) if there are spaces in
        the string, since this would cause them to be replaced by
        the SpaceSub character.
    Accept BODY=8BITMIME on SMTP MAIL command.  This isn't advertised
        because the 8BIT to 7BIT translation doesn't exist yet.
        This does add a "bodytype" field to both envelope and
        queue file and a -B command line flag to pass the type in
        during direct invocations.
    Discard return error messages only on responses to responses to
        responses, not on responses to responses.  That is, the
        algorithm is to try return to sender, then return to
        postmaster, then discard.  Previously it discarded
        immediately if the return to sender pass failed.
    CONFIG: back out change to hide unqualified hostnames behind %-hack.
        This screws up local aliases and .forward files.
    CONFIG: add FEATURE(nocanonify) to turn off calls to $[ ... $];
        some sites only handle completely canonified names.
        Requested by John Gardiner Myers of CMU.
    CONFIG: some UUCP code was still included even if FEATURE(nouucp)
        was specified.

6.52/6.24    93/04/10
    Clean up some minor glitches on error return messages pointed out
        by Motonori Nakamura of Kyoto University.
    Fix reply() to not reset SmtpReplyBuffer on fatal errors; this
        was supposed to reset SmtpMsg Buffer.  This makes the
        client side code virtually useless.  Reported by Allan
        E Johannesen of WPI and Phil Brandenberger of Swarthmore.
    Better debug messages if fuzzy is disabled, suggested by Allan
        E Johannesen of WPI.
    Offset SmtpReplyBuffer by four in usersmtp when checking for
        loopback.  From Eric Wassenaar.
    Don't set $s until after runinchild in srvrsmtp -- otherwise
        it gets cleared.  From Eric Wassenaar.
    Implement IDA-style $&x for deferred macro expansion.
    More POSIX compatibility.
    CONFIG: Hide unqualified hostnames behind %-hack using $s as the
        actual sender.  This is only done if $r is non-null, that
        is, if this is not locally submitted mail.
    CONFIG: Add FEATURE(bitdomain) allowing mapping of BITNET host
        names to internet domains.  A program contributed by
        John Gardiner Myers of CMU to create the maps is included
        in the contrib directory (in the "misc" tar file).
    CONFIG: Add FEATURE(uucpdomain) for a similar mapping for UUCP
        hosts.  There is currently no tool to create this map.

6.51/6.23    93/04/04
    Add D= mailer flag to specify a path of possible working directories
        in which to execute the mailer.  This is intended for the
        prog mailer; some shells can get upset if they don't have
        access to the current directory.
    Add RFC 1413 (IDENT) protocol support.  This is only very loosely
        tested.  This adds a $_ macro to be the authenticated
        info (in ``user@domain [address]'' form) and debug flag
        9 to trace the protocol.
    Check for loopbacks in usersmtp instead of srvrsmtp -- there is no
        reason for a local agent to not be talking to the localhost
        (although the inverse is not true).
    Add a few hooks for automated map rebuilding.  This is certainly
        not done yet.
    CONFIG: Have prog mailer specify a path of ``D=$z:/'' -- that is,
        user's home directory then the root.
    CONFIG: Log RFC 1413 identification in Received: line.

6.50/6.22    93/04/01
    Fixes to requeueing code to make it compute priority, nrcpts,
        and the like properly.

6.49/6.22    93/04/01
    Diagnose incorrect privacy flags.  Suggested by Bryan Costales
        of ICSI.
    Some ANSI C fixes.
    Arrange to quote backslashes as well as other special characters
        in the phrase part of a route-addr.
    Some fixes to FallBackMX code suggested by Motonori Nakamura of
        Kyoto University.
    More vigorous zeroing of CurHostAddr to avoid logging of bogus
        host addresses when you are actually just printing
        information from the MCI structure; problem noted by
        Michael Corrigan of U.C. San Diego.
    Don't ignore rest of queue if any job is not runnable.  This can
        also cause an incorrect job to be lost.  Fix from
        Eric Wassenaar.
    Always respond "quickly" to RCPT command; do alias expansion and
        the like later.  This also means that mail for lists that
        have errors will be acccepted, and an error sent back
        later.  This is done by instantiating the queue file
        and then immediately running and requeueing it.

6.48/6.22    93/03/30
    Fix incorrect diagnosis of infinite loop in ruleset.  Problem noted
        by several people.
    Improve information printed when infinite loops are discovered.
    Zero CurHostAddr to fix erroneous internet addresses in log when no
        addresses can be bound.  Pointed out by Motonori Nakamura
        of Kyoto University.
    "Probe" SMTP connections using RSET instead of NOOP "just in case".
        Suggested by John Gardiner Myers of CMU.
    Don't warn about -f if you are setting sender to yourself.

6.47/6.22    93/03/29
    Fix incompatible call to endmailer in smtpquit which causes core
        dumps.  Noted by Allan E Johannesen of WPI.
    HPUX portability changes from Michael J. Corrigan of UC San Diego.
    Require MAIL before RCPT command in srvrsmtp.c.  This had been
        intentional from the 821 draft days when the order wasn't
        clear, but is silly now.
    Fix bug in nis_magic routine that was initializing parameters
        incorrectly.  Fix from Takahiro Kanbe of Fuji Xerox
        Information Systems Co., Ltd.
    Change default for PrivacyFlags in conf.c to 0 -- since it always
        "or"s in new values, there was no way to turn off the
        AuthWarning stuff.
    Add O option to set SMTP daemon options.
    Add V option to set fallback MX host.  This always sorts at lower
        priority than anything it gets from the name server.  It
        should only be used for environments with very bad network
        connectivity.  Requested by several people.
    Log sending info.  It's not clear this is a good idea.
    CONFIG: fix typo in mailertable code.  Noted by Phil Brandenberger
        of Swarthmore.
    CONFIG: add confDAEMON_OPTIONS and confFALLBACK_MX to set options
        O and V, respectively.

6.46/6.21    93/03/26
    Fix botch in server SMTP that broke transactions that did not
        use HELO first (like MH).  Fix from Michael Corrigan
        of U.C. San Diego.
    Fall back to other MX records if there is an error anywhere
        in delivery (actually on MAIL or DATA -- RCPT is harder).
        Suggested by John Gardiner Myers and Motonori Nakamura.
    Revert to non-prototypes -- it turns out that our ANSI C
        compiler is more forgiving than most others about
        mixing prototyped extern declarations with non-prototyped
        function definitions.
    Fix a problem with multi-word class matching pointed out by
        Neil Rickert.  Given:
            CX b a.b.c
            R$+ $=X $+    $: $1 < $2 > $3
        the input "user@a.b.c" failed instead of being properly
        rewritten as "user@a.<b>.c".
    Neil also convinced me that it was correct that $~ should match
        only one token -- the problem is that it's always possible
        to add another token, so $~ matches far too eagerly.

6.45/6.21    93/03/25
    Implement multi-word classes (properly!).

6.44/6.21    93/03/25
    Add X-Authentication-Warning: headers to clue users into possible
        attempts to forge mail.  This is on the authwarnings
        privacy flag, but is the default.  Suggested by Bryan
        Costales of ICSI.
    Pass default units for convtime in so they can be more reasonable.
    Allow config files to always add a new Comments: header (i.e.,
        they will be added even if an old one already exists).
        Suggested by Bryan Costales of ICSI.
    Allow config files to delete an existing Return-Path: header.
        These should only be added at final delivery.  Suggested
        by Bryan Costales of ICSI.
    Some debugging additions.  Suggested by Bryan Costales of ICSI.
    Clean up logging of Family 0 addresses.  Noted by David Muir
        Sharnoff and others.
    Add a "dequote" map class.  This allows config files to strip
        quotes off of addresses.  Note that this is not a builtin
        map, just a class -- so you have to define the map
        using the K line.
    Fix a bug in the queueup() loop getting a locked tf where in
        very odd cases it can fall off the bottom and core dump.
        Of course, it was P{r Emanuelsson who found it....
    Open a new transcript when splitting an envelope.  Problem found
        by Allan E Johannesen of WPI.
    Improved error output in endmailer if the mailer core dumps.
    CONFIG: Fix typo in UUCP mailer definition.
    CONFIG: Default several of the new options on: eight bit input,
        privacy flags set to "authwarnings", and message warning
        set to 4h.
    CONFIG: Use dequote map.

6.43/6.20    93/03/23
    Fix problem with assumption of an sa_len field in a generic
        sockaddr -- it turns out that most vendors haven't
        picked up this (very important) fix.
    Change compilation flags for daemon code -- select one or both
        of NETINET or NETISO, but don't ever set DAEMON manually.
    CONFIG: add FEATURE(mailertable) to do IDA-style mailertables.

6.42/6.19    93/03/19
    Use Postmaster as default fallback return address, not root.
    POSIX changes for file descriptor handling.
    Diagnose errors writing new queue file.
    If you change the owner using an owner- alias, also change the
        error mode to EM_MAIL so that errors don't get dropped
        into an inappropriate directory.  Problem noted by
        Allan E Johannesen of WPI.
    If you are su'ed to root, send email as who you really are, not
        as root.  From Brian Kantor of U.C. San Diego.
    Allow warning messages to be sent after a configurable interval
        has passed without delivery.  The message is sent only
        once per envelope.  This changes the format of the qf
        file to have an F line, and the format of the T option
        to accept take the format "return/warn" (both intervals).
    Don't force all local names to lower case -- this was left over
        from the weird handling of case mapping on aliases.  It
        is now driven (as expected) by the "u" mailer flag.
        Problem noted by P{r Emanuelsson.
    Fix problem that caused headers on returned email to be trashed;
        they were getting freed, but are still accessible via
        BlankEnvelope.
    Fix problem that caused bogus ids to be created on returned
        mail.
    Add support for ISO and other non-INET networking.  This is by
        no means finished yet.  This does assume a lot of other
        system support, like a version of gethostbyname that
        returns non-AF_INET addresses.
    CONFIG: change default on prog mailer to keep upper case in
        user names (i.e., in the program command line).
    CONFIG: strip trailing dots off of hosts in uucp mailer before
        convert to bang format.
    CONFIG: create new "relay" mailer for $R (LOCAL_RELAY) and $H
        (MAIL_HUB) delivery that doesn't add local domain.  Note
        that this violates 821, but is probably "more correct"
        for what we are trying to do.  Problem pointed out by
        Michael Graff of Iowa State.

6.41/6.18    93/03/18
    Clean up unnecessary creates of queue ids (i.e., empty qf files)
        when not needed, such as when starting up an SMTP
        connection.
    Fix problem where split envelopes aren't instantiated in the queue.
        This is quite a serious bug.
    Owner- aliases had problems with leading spaces causing a
        premature delimitation.

6.40/6.18    93/03/18
    Have ending 250 (after DATA) include the id; suggested by
        Brian Kantor of UC San Diego.
    Add logging on envelope splitting.
    Change queue ids to have one more letter encoding the hour of
        the day so that during a single day there is a greater
        likelihood of uniqueness; requested by Brian Kantor.

6.39/6.18    93/03/18
    Fix minor compile problem if LOCKF is defined.
    Define size of tobuf in conf.h.  Observed by Toshinari Takahashi
        of Toshiba.
    Restore e_sender -- this is equivalent to e_from.q_paddr without
        decorations such as angle brackets and comments.
    OSF/1 on Alpha changes from Allan E Johannesen of WPI.
    CONFIG: fix typo in S3 for list syntax (;: => :;).  Thanks to
        Christopher Hoover for noting the problem.

6.38/6.17    93/03/17
    Pass envelope to disconnect to avoid another use of CurEnv, which
        can apparently end up being null at inopportune times.
    Log "received from" as "relay=" for consistency (suggested by
        John Gardiner Myers).
    Fix major bug in header handling:  if no From: line existed in
        the header (so sendmail inserts one), and the sender is
        an alias that has an owner, the From: line shows the
        owner (as well as the envelope).  Fixed by early binding
        the headers (which will change debugging output).
    HPUX portability patches from Michael J. Corrigan of UC San Diego.
    Some attempts to adapt better to out of open file conditions.
    Some changes to ctladdr handling in queue files.

6.37/6.17    93/03/16
    MAJOR CHANGE:  delete e_sender and e_returnpath (why are these
        different from e_from?) and $< macro.
    Log correct IP address in relay= field even if the connection
        times out.
    Log "received from [RESPONSE]" on EF_RESPONSE messages (from
        John Gardiner Myers).
    Fixes to SysExMsg logging (sometimes just got "message: %s"
        instead of "message: error message"), noted by Eric
        Wassenaar.  Also reported by Motonori Nakamura.
    Improvements to MX piggybacking code, from Motonori Nakamura.
    Fix case where CurHostName points to an auto variable that has
        been deallocated (from Motonori Nakamura).
    Fix bug causing newlines to be included in aliases if option
        "n" (check alias RHS) is set; bug noted by David Muir
        Sharnoff.
    Fix problem causing user names that should be mapped to lower
        case to not be mapped if they are sent during a queue
        run.  This greatly simplifies the case mapping code.
        Problem noted by Allan E Johannesen of WPI.
    Don't do recipient address rewriting in buildaddr.  This
        improperly did recipient rewriting on sender addresses,
        and just seems bogus in general -- but the change could
        break some .cf files.
    Pass TZ envariable to child processes for System V.
    CONFIG: allow LOCAL_RULE_1 and LOCAL_RULE_2 if you want to
        define those rulesets.
    KNOWN PROBLEM:  I have seen some problems on SunOS that causes
        the User Data Base to give errors on some addresses.  I
        have tracked the problem back at least as far as 93.02.15
        (version 6.22).  Running with debugging on makes it
        go away, so I conclude that it is referencing uninitialized
        stack data.  I haven't been able to track this down yet.

6.36/6.16    93/03/08
    Allow local mailer to specify $@host -- this lets you assign the
        "foo" part of jgm+foo to $h for passing in to the local
        mailer.
    Additional debug printing in getcanonname (show query type).
    Don't add the e_fromdomain on sender addresses -- this interacts
        weirdly with the owner- code.
    Improve delivery logging to not log obvious or meaningless stuff.
    Include numeric IP address in Received: lines per RFC 1123 section
        5.2.8.
    Fixed a bug in checking stat() return value if restrictmailq is
        set.  Also, check the entire group set instead of just the
        primary group.  Both from John Gardiner Myers.
    Don't have usrerr automatically print errno, since this is often
        misleading.
    Use transienterror() in makeconnection after connect() fails and
        in openmailer after execve() fails (from Eric Wassenaar).
        Also moved transienterror() from util.c to conf.c.
    Clean up from= logging on response messages.
    Undo patch allowing prescan to return a null vector -- it breaks
        too many things.
    Config: FEATURE(notsticky) lets you use UDB for everything coming
        in to the machine, even if it is specifically targetted
        to this machine.  Without it, UDB is bypassed if the user
        name is fully qualified.
    Config: fix another minor botch with <> (local mailer wasn't
        mapping them properly).

6.35/6.15    93/03/05
    Fix getrealhostname to return null if sinlen <= 0 -- this can
        occur if stdin is a pipe.
    Avoid infinite loop in getcanonname if name server return
        NO_DATA (for example).
    Config: avoid having C flag qualify list syntax and error syntax.

6.34/6.14    93/03/05
    Fix logging in deliver to not pass too many parameters to Ultrix
        versions of syslog.
    Don't write the pid file until after the daemon has actually
        opened and conditioned the connection.
    Consider addresses "different" if their q_uids differ (so that
        two users forwarding to the same program will be seen
        as different, rather than the same).
    Fix problem with bad parameters in main() -- they set ExitStat
        but don't exit.
    Fix null pointer references through RealHostName -- painfully
        discovered by Allan E Johannesen of WPI.
    Fix bug causing user@@localhost to core dump (yuch).
    Config: don't put two @host.dom.ain on users in $=E in SMTP
        mailer.  Also, catch user@ (no host) in ruleset 0.

6.33/6.13    93/03/03
    Config: add confCW_FILE as the name of the cw configuration file
        (defaults to /etc/sendmail.cw).  From P{r Emanuelsson.
    Allow prescan to return a pointer to an empty list -- this is
        not an error.  Also, clean up error reporting to avoid
        double errors (prescan reports once, then the caller
        reports again).
    Changes to avoid trusting T_ANY queries -- run them, but if you
        don't get the info you expected, do T_A and T_MX queries
        anyhow.  This also fixes an oversight where _res.options
        bits were being ignored.
    If PRIV_NOVRFY is set, use 252 response code instead of 502 per
        RFC 1123 section 5.2.3.  It's not 100% clear that this
        is correct, but it probably works better with stupid
        mailers that do a VRFY and only check the first digit.

6.32/6.12    93/03/02
    Fix uninitialized variable "protocol" in smtp code.
    Include <unistd.h> in sendmail.h -- move towards POSIX/ANSI.
    Additional hooks for RFC 1427 (ESMTP SIZE extension).  This
        includes requiring that enoughspace() know the system
        block size, which will undoubtedly break most ports.
    Trace flag 19 in use for srvrsmtp.c.
    Additional logging -- notably the sending mailer name.  This
        also changes the delivery logging to strict field=value
        syntax.
    Fix some problems with messages getting sent even to addresses
        that had been marked bad -- from Eric Wassenaar.
    More WIDE changes: accept host name inside [...] as non-MXed
        host.  This is intended ONLY for use inside firewalled
        environments, where the MX points at the gateway.
    Change .cf file conventions so that mapping for <> addresses
        don't have an @ in them (to avoid confusing the C mailer
        flag).  Pointed out by Neil Rickert.
    Config extensions for Sam Leffler's FlexFAX software.

6.31/6.10    93/02/28
    Fix some more bugs in alias owner code -- there were some weird
        cases where an error in a non-aliased name would override
        the return info in an aliased name with an owner.
    Changes from WIDE Project, forwarded to me by Motonori Nakamura:
        Log actual delivery host (after MX et al); from
            [e-mail].
        Log daemon startup.
        Deliver Postmaster copies without a body.
        Better logging of SMTP senders.
        Send all program email as daemon even when local.
    As requested in various forms from many people, accept -qIstring
        to limit queue runs to jobs with queue-id matching string.
        Similarly for -qRstring for recipients, -qSstring for
        senders.
    Initial hooks for ESMTP support (see RFC 1425).
    Fixed a syntax error in the UUCP mailer specification that caused
        core dumps on startup.
    Check for missing A= or P= arguments in mailer definitions.

6.30/6.10    93/02/27
    Require FROZENCONFIG compilation flag to include frozen
        configuration code.  Frozen configuration is really
        not a very good idea any more, particularly in shared
        library environments.
    Do better checking of errno after opens of :include: and .forward
        files to defer delivery on network and other transient
        errors.  Suggestion from Craig Everhart.
    Fix minor botch in read timeout macro processing.
    Add FEATURE(nouucp) to config files for sites that know absolutely
        nothing about UUCP.
    Add built cf files to distribution tape and clarify how to build
        them if you don't have the Berkeley make.
    Some sizeof(long) portability changes for the Alpha, from Allan
        E Johannesen.
    Add "restrictmailq" privacy flag -- if set, only people in the same
        group as your queue directory can print the queue.  If you
        set this, be sure you also restrict access to log files....
    Fix another bug in owner-list stuff that can cause data files to
        be "lost".
    Fix a bug with queue runs that cause forwards to yourself to go
        into alias/forwarding loops.  I'm still iffy about this
        fix.
    Fix from Eric Wassenaar for suppression of return message code.

6.29/6.9    93/02/24
    Fix yet another problem in alias owner code -- put the wrong return
        address on the enclosed return-to-sender letter.

6.28/6.9    93/02/24
    Fix botch in alias owner code that caused it to not operate if the
        error was detected locally.

6.27/6.9    93/02/24
    M_LOCAL => M_LOCALMAILER to avoid conflict with Ultrix include
        file <sys/mount.h>.
    Miscellaneous bug fixes from Eric Wassenaar:
        sendmail -bv -t logs the from line even though in verify
            mode only.
        sendmail -v can go into queue mode if shouldqueue returns
            TRUE.
    Add route-addr pruning per RFC 1123 section 5.3.3.  This can be
        disabled using the "R" option.
    Delete (always undocumented) -R flag (save original recipients);
        there are ways to syslog(3) these now.
    Clean up SMTP reply codes -- specify them as needed in the code,
        instead of in conf.c -- this was needed during the NCP to
        TCP transition, but seems silly now.  This also changes
        parameters to message and nmessage.
    Have mailstats read the .cf file to find the sendmail.st file and
        get text versions of mailer names.  An initial version of
        this code was provided by Tuominen Keijo (although the
        comments indicate the good bits were written by "E.V.").
    Add yet more System V compatibility hacks.
    Fix bug in VRFY code (assumes everything must be a local user).
    Allow specification of any of the hard-wired pathnames in the
        Makefile.
    Delete concept of "trusted users" -- this really didn't provide
        any security anyway, and caused some problems.
    Delete last vestige of support for the word "at" as an equivalent
        to the character "@".
    Propagate owner-foo alias information into the envelope sender.
        Based on code from John Gardiner Myers.  This is a major
        semantic change -- beware!
    Allow $@ on LHS to indicate "match zero" -- this is used to match
        the null expression.

6.26/6.8    93/02/21
    Don't "lose" queue runs.  Very important fix from (who else?)
        Eric Wassenaar.
    Completely reset state on RSET command -- from Eric Wassenaar.
    Send error messages and return receipts using an envelope sender
        of <> regardless of the setting of $n.  Rewriting rules
        can undo this if they feel the necessity, as might be
        needed for networks that don't understand the syntax.
        This is permitted by RFC 821 section 3.6 and required by
        RFC 1123 section 5.3.3.  THIS REQUIRES VERSION 4 CONFIG
        FILES because the rulesets must be able to parse <>
        properly.
    Don't ever send error messages to "<>" -- they will get sent to
        the local postmaster or dumped in /usr/tmp/dead.letter
        instead.  Per RFC 1123 section 5.3.3.
    Explicitly check for email to yourself as a dotted quad.  You
        have to call $[ [ ... ] $] to get this.
    Up the message timeout to five days per RFC 1123 section 5.3.1.1.
    Make all read timeouts individually configurable, as strongly
        recommended by RFC 1123 section 5.3.2.
    Use f_bavail (blocks available to regular users) instead of f_bfree
        (blocks available to superuser) in free block checks.
    Change $d macro to be the current time, not the origination time,
        since this is consistent with how it is used now.
    Generalization of enoughspace from Eric Wassenaar covering
        SGI, Apollo, HPUX, Ultrix, and SunOS.
    Ignore process group signals -- some front ends can do this if
        you kill a window too quickly.  From Eric Wassenaar.
    Change umask to 022.

6.25/6.8    93/02/20
    Close all cached connections before calling mailers and after
        forking for delivery (caused double closes which resulted
        in false errors).
    Add FEATURE(redirect) in config files -- this allows you to alias
        old addresses to a pointer to the new address that will
        give a 551 error message, but not deliver the mail.
    Some code changes to make the 551 errors look pretty.
    Names of M4 program paths in config files have changed -- they
        are all XXX_MAILER_PATH now, to match XXX_MAILER_FLAGS.
    Fix a bug in the QSELFREF code having to do with empty .forward
        files, reported by Eric Wassenaar.
    Add option "p" (privacy flags); this allows you to tune how
        picky the SMTP server will be.  This also adds the
        confPRIVACY_FLAGS M4 macro in the config files.
    Add option "b" (minimum blocks free).  If there are fewer than
        this number of blocks free on the filesystem containing
        the queue directory, the SMTP MAIL command will return
        a 452 response and ask you to try again later.  This
        also adds the confMIN_FREE_BLOCKS M4 macro in the config
        files.
    Made VRFY just verify (doesn't expand aliases and .forward files);
        EXPN does full expansion.  RCPT in queue-only mode also
        doesn't chase aliases and .forward.

6.24/6.7    93/02/19
    Increase the number of domain search entries in domain.c to allow
        for the extra "" entry indicating the root domain.
        Reported by Motonori Nakamura of Kyoto U.
    Add a "SMART_HOST" in the configs for UUCP-connected sites that
        want to forward all mail with extra "@"s to that site.
        Also allows SMART_HOST, LOCAL_RELAY, and MAIL_HUB to
        be specified as ``mailer:hostname'' to use an alternate
        mailer.
    Clarified and updated some wording in the Operations Guide.
    Add the "c" mailer flag -- this suppresses all comment parts of
        addresses (requested by John Curran of NEARnet).
    Have -v print prompts in -bt mode even if stdin is not a terminal
        (default behaviour is to be silent if not reading from
        a terminal).  Suggested by Bryan Costales, ICSI.
    Move the metacharacters from C0 space (\001-\037) into C1 space
        (\201-\237).  This also fixes a bunch of potential bugs
        with G1 characters (\240-\276) in headers relating to
        negative numbers passed to isspace() et al.
    Add YP_LAST_MODIFIED and YP_MASTER_NAME to DBM version of alias
        database if YPCOMPAT is #defined.  Enhancement from
        Takahiro Kanbe of Fuji Xerox Information Systems Co., Ltd.
    Add "list" Precedence (-30); this can be used with old sendmails
        which will map to precedence 0 (which will return error
        messages).  Suggested by Stephen R. van den Berg.
    Many bug fixes from Eric Wassenaar of the National Institute for
            Nuclear and High-Energy Physics, Amsterdam:
        Clear timeouts properly on open failures in include().
        Don't dereference through NULL if no home directory found.
        Re-establish SIGCHLD signal on System 5 in reapchild().
        Avoid NULL pointer reference on -pFOO flag.
        Properly handle backslash escapes in comments.
        Correctly check reply status on SMTP NOOP command.
        Properly save SMTP error message if peer gives
            "Service Shutting Down" message.
        Avoid writing to the transcript if it couldn't be opened.
        Signal errors in SMTP children to parent properly.
    Handle self references in a list more globally (include a
        QSELFREF bit in the address flags).  This enhancement
        was suggested by Eric Wassenaar.
    Use initgroups() in hpux, even though it's System-V based.  The
        HASINITGROUPS compile flag can set this on other systems.
        This HPUX behaviour was pointed out by Eric Wassenaar.

6.23/6.6    93/02/16
    Clean up handling of LogLevel to make it easier to figure out
        what's on what level.
    Change log levels to have some consistency:
        1    serious system failures, security problems
        2    lost communications, protocol failures
        3    other serious failures
        4    minor errors
        5    message collection
        6    vrfy logging, creation of return-to-sender
        7    delivery failures
        8    delivery successes
        9    delivery tempfails (queue ups)
        10   database expansion
        >64  debugging
    Allow IDA-style separated processing on S= and R= in Mailer
        definition lines.  Note that rulesets 1 and 2 are
        still used for both addresses as before.  Bruce Lilly
        gave a convincing argument that RFC976 insists on
        this behaviour.
    Added some time zones to arpatounix -- they may not be in the
        standards, but they are in use.  However, I may delete
        arpatounix entirely -- there appears to be no reason
        for it to exist.
    Change to UUCP mailer (in cf directory) to try to do a saner job.
        I'm still not certain about this mailer in general.

6.22/6.5    93/02/15
    Fix bug that prevents saving letters in ~/dead.letter.
    Don't add angle brackets in VRFY command if angle brackets already
        exist in the address.
    Fix bogus error message in udbexpand.
    Null terminate host buffers in buildaddr (broken in 6.21) --
        IMPORTANT FIX!!

6.21/6.5    93/02/15
    Fix another incorrect error message in alias.c, found by Azuma
        Okamoto.
    Fix a couple of problems in the more-configurable config files,
        found by Tom Ivar Helbekkmo.
    Fix problem with quoted :include: entries.
    Don't duplicate the filename on verbose printing of .forward and
        :include: contents.
    Extend size of prescan buffer (to allow bigger addresses).  Also,
        detect some buffer overflows.
    Log user SMTP protocol errors (log level 4).

6.20/6.4    93/02/14
    Fix another problem in the MCI state machine caused when there
        were errors generated from the other end to commands
        other than RCPT.

6.19/6.4    93/02/14
    Include load average support for DEC Alpha running OSF/1.
    Fix multiple-response problem with errors in MAIL From: line.
    Fix SMTP reply codes for invalid address syntaxes (give 501;
        never give multiple error messages for a single message).
    Fix problem where a cached connection timeout rejects all
        later connects to that host.
    Fix incorrect error message if alias.c is compiled with DBM only.
    Additional changes to fix nested conditionals (from Bruce Lilly).
    Recover more gracefully from operating system failures, particularly
        NULL returns from openmailer (from Noritoshi Demizu,
        OMRON Corporation).
    Log forward, alias, and userdb expand operations on log level 10;
        concept suggested by P{r (Pell) Emanuelsson.
    Changes for HPUX 8.07 compatibility.

6.18/6.4    93/02/12
    Allow any config option to be set using an M4 define.
    Change UNAME compile flag to HASUNAME for IDA compatibility
        (besides, it's a better name).
    Note in README that on SunOS it must be linked -Bstatic.
    Fairly major change in domain.c to handle wildcard MX records
        more rationally.  NOTE: the "w" option (no wildcard MX
        records match local domain) has been eliminated.
    Fix some unset variable references pointed out by Bruce Lilly.
    Fix host name in process titles when using cached connection.

6.17/6.3    93/01/28
    Fix System 5 compatibility changes to be compatible with the rest
        of the world.

6.16/6.3    93/01/28
    Experimental fix for problem handling errors in the SMTP
        protocol in conjunction with connection caching.
    System 5 compatibility changes.

6.15/6.3    93/01/26
    Fix a bug that causes local mail delivered using -odq to be
        eliminated as a duplicate (because it matched the
        ctladdr, now passed in as a C line).  These changes
        are pretty tricky......

6.14/6.3    93/01/25
    Add debugging for some MCI errors.

6.13/6.3    93/01/22
    Fix -e compatibility flag to take a value.
    Fix a couple of minor compilation warnings on Sun cc.
    Improve error messages in a few cases to be more self-explanatory.

6.12/6.3    93/01/21
    Fix yet-another problem with environment handling, pointed out
        by Yoshitaka Tokugawa and Tom Ivar Helbekkmo.
    Some heuristics to try to limit resource exhaustion problems
        if a downstream host has been down for a long time.
    Fix problem with incorrect host name being logged in "Connection
        timed out" messages (from Tom Ivar Helbekkmo).
    Fix some ANSI C problems (from Takahiro Kanbe).
    Properly log message sender on returned mail during queue run.
    Count number of recipients properly.
    Fix a problem in yp map code.
    Diagnose "message timed out" (from Motonori Nakamura).

6.11/6.3    93/01/20
    Fix problem with address delimitor inside quotes.
    Define $k and $=k to be the UUCP name (from the uname call)
        based on code from Bruce Lilly.

6.10/6.2    93/01/18
    Implement arpatounix (largely code from Bruce Lilly).
    Log more info (suggested by John Myers).
    Allow nested $?...$|...$. (inspired by code from Bruce Lilly of
        Sony US).
    POSIX compatibility (noted by Keith Bostic).
    Handle SMTP MAIL command errors properly (urged by several people,
        notably John Myers of CMU).
    Do early diagnosis of .cf errors (notably referencing a RHS
        substitution that isn't on the LHS).
    Adjust checkpointing to better handle batched recipients, suggested
        by John Myers.
    Fix miscellaneous bugs.
    (config files:)  Implement MAIL_HUB for all local mail (to handle
        NFS-mounted directories) as urged by Tom Ivar Helbekkmo
        of the Norwegian School of Economics.

6.9/6.1     93/01/13
    Environment handling simplification/bug fix -- child processes
        get a minimal, fixed environment.  This avoids different
        behaviour in queue runs.
    Handle commas inside comments properly.
    Properly limit large messages submitted in -obq mode.

6.8/6.1        93/01/10
    Check mtime of thaw file against .cf and sendmail binary, based on
        code from John Myers.

6.7/6.1        93/01/10
    MX piggybacking, based on code from John Myers@CMU.
    Allow checkcompat to return -1 to mean tempfail.
    Bug fix in m_mno computation.

6.6/6.1        93/01/09
    Tuning of queueing functions as recommended by John Gardiner Myers.
    Return mail headers (no body) on messages with negative precedence.
    Minor other bug fixes.

6.5/6.1        93/01/03
    Fix botch causing queued headers to have ?XX? prefixes.

6.4/6.1        93/01/02
    Changes to recognize special mailer types (e.g., file) early.

6.3/6.1        93/01/01
    Pass timeouts to sfgets.
    Check for control characters in addresses.
    Fixed deferred error reporting.
    Report duplicate aliases.
    Handle mixed case recursive aliases.
    Misc bug fixes.

6.2/6.1        92/12/30
    Put return-receipt-to on a conf.c flag (but don't set it).
    Fix minor syslog problem.