mdw@git.distorted.org.uk Git - qmail/blob - BLURB3

   1 Here are some of qmail's features.
   2
   3 Setup:
   4 *  automatic adaptation to your UNIX variant---no configuration needed
   5 *  AIX, BSD/OS, FreeBSD, HP/UX, Irix, Linux, OSF/1, SunOS, Solaris, and more
   6 *  automatic per-host configuration (config, config-fast)
   7 *  quick installation---no big list of decisions to make
   8
   9 Security:
  10 *  clear separation between addresses, files, and programs
  11 *  minimization of setuid code (qmail-queue)
  12 *  minimization of root code (qmail-start, qmail-lspawn)
  13 *  five-way trust partitioning---security in depth
  14 *  optional logging of one-way hashes, entire contents, etc. (QUEUE_EXTRA)
  15
  16 Message construction (qmail-inject):
  17 *  RFC 822, RFC 1123
  18 *  full support for address groups
  19 *  automatic conversion of old-style address lists to RFC 822 format
  20 *  sendmail hook for compatibility with current user agents
  21 *  header line length limited only by memory
  22 *  host masquerading (control/defaulthost)
  23 *  user masquerading ($MAILUSER, $MAILHOST)
  24 *  automatic Mail-Followup-To creation ($QMAILMFTFILE)
  25
  26 SMTP service (qmail-smtpd):
  27 *  RFC 821, RFC 1123, RFC 1651, RFC 1652, RFC 1854
  28 *  8-bit clean
  29 *  931/1413/ident/TAP callback (tcp-env)
  30 *  relay control---stop unauthorized relaying by outsiders (control/rcpthosts)
  31 *  no interference between relay control and forwarding
  32 *  tcpd hook---reject SMTP connections from known abusers
  33 *  automatic recognition of local IP addresses
  34 *  per-buffer timeouts
  35 *  hop counting
  36
  37 Queue management (qmail-send):
  38 *  instant handling of messages added to queue
  39 *  parallelism limit (control/concurrencyremote, control/concurrencylocal)
  40 *  split queue directory---no slowdown when queue gets big
  41 *  quadratic retry schedule---old messages tried less often
  42 *  independent message retry schedules
  43 *  automatic safe queueing---no loss of mail if system crashes
  44 *  automatic per-recipient checkpointing
  45 *  automatic queue cleanups (qmail-clean)
  46 *  queue viewing (qmail-qread)
  47 *  detailed delivery statistics (qmailanalog, available separately)
  48
  49 Bounces (qmail-send):
  50 *  QSBMF bounce messages---both machine-readable and human-readable
  51 *  HCMSSC support---language-independent RFC 1893 error codes
  52 *  double bounces sent to postmaster
  53
  54 Routing by domain (qmail-send):
  55 *  any number of names for local host (control/locals)
  56 *  any number of virtual domains (control/virtualdomains)
  57 *  domain wildcards (control/virtualdomains)
  58 *  configurable percent hack support (control/percenthack)
  59 *  UUCP hook
  60
  61 SMTP delivery (qmail-remote):
  62 *  RFC 821, RFC 974, RFC 1123
  63 *  8-bit clean
  64 *  automatic downed host backoffs
  65 *  artificial routing---smarthost, localnet, mailertable (control/smtproutes)
  66 *  per-buffer timeouts
  67 *  passive SMTP queue---perfect for SLIP/PPP (serialmail, available separately)
  68
  69 Forwarding and mailing lists (qmail-local):
  70 *  address wildcards (.qmail-default, .qmail-foo-default, etc.)
  71 *  sendmail .forward compatibility (dot-forward, available separately)
  72 *  fast forwarding databases (fastforward, available separately)
  73 *  sendmail /etc/aliases compatibility (fastforward/newaliases)
  74 *  mailing list owners---automatically divert bounces and vacation messages
  75 *  VERPs---automatic recipient identification for mailing list bounces
  76 *  Delivered-To---automatic loop prevention, even across hosts
  77 *  automatic mailing list management (ezmlm, available separately)
  78
  79 Local delivery (qmail-local):
  80 *  user-controlled address hierarchy---fred controls fred-anything
  81 *  mbox delivery
  82 *  reliable NFS delivery (maildir)
  83 *  user-controlled program delivery: procmail etc. (qmail-command)
  84 *  optional new-mail notification (qbiff)
  85 *  optional NRUDT return receipts (qreceipt)
  86 *  conditional filtering (condredirect, bouncesaying)
  87
  88 POP3 service (qmail-popup, qmail-pop3d):
  89 *  RFC 1939
  90 *  UIDL support
  91 *  TOP support
  92 *  APOP hook
  93 *  modular password checking (checkpassword, available separately)