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+Here are some of qmail's features.
+* 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 (config, config-fast)
+* quick installation---no big list of decisions to make
+* 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 address lists to RFC 822 format
+* sendmail hook for compatibility with current user agents
+* header line length limited only by memory
+* host masquerading (control/defaulthost)
+* user masquerading ($MAILUSER, $MAILHOST)
+* automatic Mail-Followup-To creation ($QMAILMFTFILE)
+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 .forward compatibility (dot-forward, available separately)
+* fast forwarding databases (fastforward, available separately)
+* sendmail /etc/aliases compatibility (fastforward/newaliases)
+* 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 mailing list management (ezmlm, available separately)
+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, bouncesaying)
+POP3 service (qmail-popup, qmail-pop3d):
+* RFC 1939
+* UIDL support
+* TOP support
+* APOP hook
+* modular password checking (checkpassword, available separately)