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- Here are some of qmail's features.
-
- Setup:
- * automatic adaptation to your UNIX variant---no configuration needed
- * AIX, BSD/OS, FreeBSD, HP/UX, Irix, Linux, OSF/1, SunOS, Solaris, and more
- * automatic per-host configuration (qmail-config)
- * quick installation---no big list of decisions to make
-
- Security:
- * clear separation between addresses, files, and programs
- * minimization of setuid code (qmail-queue)
- * minimization of root code (qmail-start, qmail-lspawn)
- * five-way trust partitioning---security in depth
- * optional logging of one-way hashes, entire contents, etc. (QUEUE_EXTRA)
-
- Message construction (qmail-inject):
- * RFC 822, RFC 1123
- * full support for address groups
- * automatic conversion of old-style headers to RFC 822 format
- * header line length limited only by memory
- * host masquerading (control/defaulthost)
- * user masquerading (MAILUSER, MAILHOST)
- * sendmail hook for compatibility with current user agents
-
- SMTP service (qmail-smtpd):
- * RFC 821, RFC 1123, RFC 1651, RFC 1652, RFC 1854
- * 8-bit clean
- * 931/1413/ident/TAP callback (tcp-env)
- * relay control---stop unauthorized relaying by outsiders (control/rcpthosts)
- * no interference between relay control and forwarding
- * tcpd hook---reject SMTP connections from known abusers
- * automatic recognition of local IP addresses
- * per-buffer timeouts
- * hop counting
-
- Queue management (qmail-send):
- * instant handling of messages added to queue
- * parallelism limit (control/concurrencyremote, control/concurrencylocal)
- * split queue directory---no slowdown when queue gets big
- * quadratic retry schedule---old messages tried less often
- * independent message retry schedules
- * automatic safe queueing---no loss of mail if system crashes
- * automatic per-recipient checkpointing
- * automatic queue cleanups (qmail-clean)
- * queue viewing (qmail-qread)
- * detailed delivery statistics (qmailanalog, available separately)
-
- Bounces (qmail-send):
- * QSBMF bounce messages---both machine-readable and human-readable
- * HCMSSC support---language-independent RFC 1893 error codes
- * double bounces sent to postmaster
-
- Routing by domain (qmail-send):
- * any number of names for local host (control/locals)
- * any number of virtual domains (control/virtualdomains)
- * domain wildcards (control/virtualdomains)
- * configurable percent hack support (control/percenthack)
- * UUCP hook
-
- SMTP delivery (qmail-remote):
- * RFC 821, RFC 974, RFC 1123
- * 8-bit clean
- * automatic downed host backoffs
- * artificial routing---smarthost, localnet, mailertable (control/smtproutes)
- * per-buffer timeouts
- * passive SMTP queue---perfect for SLIP/PPP (serialmail, available separately)
-
- Forwarding and mailing lists (qmail-local):
- * address wildcards (.qmail-default, .qmail-foo-default, etc.)
- * sendmail/smail /etc/aliases compatibility (qmsmac, available separately)
- * mailing list owners---automatically divert bounces and vacation messages
- * VERPs---automatic recipient identification for mailing list bounces
- * Delivered-To---automatic loop prevention, even across hosts
- * automatic subscription management (qlist)
-
- Local delivery (qmail-local):
- * user-controlled address hierarchy---fred controls fred-anything
- * mbox delivery
- * reliable NFS delivery (maildir)
- * user-controlled program delivery: procmail etc. (qmail-command)
- * optional new-mail notification (qbiff)
- * optional NRUDT return receipts (qreceipt)
- * conditional filtering (condredirect)
-
- POP3 service (qmail-popup, qmail-pop3d):
- * RFC 1939
- * UIDL support
- * TOP support
- * APOP hook
- * modular password checking (checkpassword, available separately)
-