Il CD di internet/CD.iso/SOURCE/N/SENDMAIL/_SENDMAI.TAR/usr/doc/sendmail/RELEASE_NOTES

Text File | 1994-08-11 | 119.4 KB | 2,556 lines

            SENDMAIL RELEASE NOTES
         @(#)RELEASE_NOTES    8.6.9.2 (Berkeley) 4/19/94

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.

8.6.9/8.6.9    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 Rochester University.
    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 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 wierd
        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/shell 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 wierd 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 Rochester University.
    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 ${HOSTALIASES} is set, use it during canonification 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 wierd 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.

8.6.3/8.6.3    93/10/24
    IMPORTANT FIX: Fix several problems that caused open files to
        be "lost" during queue runs; this overflowed the open
        file table on large runs.  An assumption that fdopen
        always succeeds sometimes resulted in core dumps when
        this happens; sometimes the message is delivered twice,
        sometimes (probably) infinite times.  This problem in
        various form was reported by P{r (Pell) Emanuelsson and
        Robert Campbell of U.C. Berkeley.
    Special diagnosis of EMFILE error conditions -- it now prints
        the known open file descriptors so you can figure out
        what is consuming so much resources.
    Fix a couple of problems caused by early address parsing
        errors -- one caused it to return a "this is only a
        warning" when it really wasn't, and the other started
        parsing through a random pointer.  The first was
        noted by Eric Wassenaar.
    Fix an infinite loop problem caused by null components in the
        host signature.  Problem noted by Jan Sorensen.
    Be sure to reset the "current date" when sending an error
        message -- PostMasterCopy messages were being sent
        with an old Date: header.
    Fix a problem that caused duplicated mail when sendmail was
        (1) compiled without HASFLOCK, (2) you are sending to
        an alias that has an owner-* alias, (3) you execute
        sendmail with -t flag, (4) you run in -odb mode, and
        (5) the sender specifies both the alias name and
        another alias [i.e., the envelope is split], then
        duplicate messages are sent.  The problem description
        and one-line fix are from Motonori Nakamura of Kyoto
        University.
    Avoid a problem that causes error messages to be discarded
        in some cases -- this was the result of a "fix" to
        avoid duplicate error messages, but two are better
        than zero.  Reported by Tim Rylance.
    Fix a minor botch in checkfd012() -- fix from Dave Hill of
        Computervision R&D Ltd.
    Remove "X-Authentication-Warning: <user> set sender to <address>
        using -f" entirely -- it is far too eager to include
        this, and it is confusing folks.  I'll try to make it
        work "right" in 8.7.  Problem noted by Yoshitaka
        Tokugawa of dit Co., Ltd.
    Fix a race condition with the errno value in tick() and
        reapchild() -- this caused occasional misdiagnosis
        of problems.  Kyle Jones of UUNET helped this along.
    Repair rule loop-detection code.  From Michael Corrigan of
        U.C. San Diego.
    Fix a problem that caused sender domain addition (C mailer
        flag to be ignored if you use -odq or use -odb with
        a high load average.  Problem reported by Jim Murray
        of Stratus.
    Fix ident protocol on multi-homed machines.  It was not
        always using the correct interface.  Fix from J.R.
        Oldroyd of Opal.
    Previously, sendmail assumed that any SMTP greeting message
        that wasn't 2xx was a temporary failure -- it should
        only take 4xx as a temporary failure, and return a
        solid error message on anything else -- for example,
        to allow you to reject connections on a workstation
        that is MXed to a mail server.
    Portability enhancements for 386BSD/FreeBSD/NetBSD from
        Ollivier Robert.
    CONFIG: FEATURE(always_add_domain) didn't always add the domain;
        in particular, on local mail it modified the header sender
        but not the header recipient address(es).  Reported by
        Jeffrey Honig of Cornell University.  Also, strip
        any host from envelope recipient address(es), since
        local mailers don't understand host names -- this is
        to help mailertable entries.  From Christopher Davis.
    CONFIG: masquerading didn't apply to addresses that already
        had a domain.  This change replaces a local hostname
        by the masquerade name in the SMTP mailer (previously
        it only added the masquerade name if it didn't already
        have a domain name).  Several people complained about
        this.

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 Munnari University.
    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 wierd 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 wierd 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 wierd 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 wierd 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 wierd 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
        wierdly 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 wierd
        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.