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