~mdw / qmail / blame
| Commit | Line | Data |
|---|---|---|
| 2117e02e MW |
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 (qmail-config) | |
| 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 headers to RFC 822 format | |
| 20 | * header line length limited only by memory | |
| 21 | * host masquerading (control/defaulthost) | |
| 22 | * user masquerading (MAILUSER, MAILHOST) | |
| 23 | * sendmail hook for compatibility with current user agents | |
| 24 | ||
| 25 | SMTP service (qmail-smtpd): | |
| 26 | * RFC 821, RFC 1123, RFC 1651, RFC 1652, RFC 1854 | |
| 27 | * 8-bit clean | |
| 28 | * 931/1413/ident/TAP callback (tcp-env) | |
| 29 | * relay control---stop unauthorized relaying by outsiders (control/rcpthosts) | |
| 30 | * no interference between relay control and forwarding | |
| 31 | * tcpd hook---reject SMTP connections from known abusers | |
| 32 | * automatic recognition of local IP addresses | |
| 33 | * per-buffer timeouts | |
| 34 | * hop counting | |
| 35 | ||
| 36 | Queue management (qmail-send): | |
| 37 | * instant handling of messages added to queue | |
| 38 | * parallelism limit (control/concurrencyremote, control/concurrencylocal) | |
| 39 | * split queue directory---no slowdown when queue gets big | |
| 40 | * quadratic retry schedule---old messages tried less often | |
| 41 | * independent message retry schedules | |
| 42 | * automatic safe queueing---no loss of mail if system crashes | |
| 43 | * automatic per-recipient checkpointing | |
| 44 | * automatic queue cleanups (qmail-clean) | |
| 45 | * queue viewing (qmail-qread) | |
| 46 | * detailed delivery statistics (qmailanalog, available separately) | |
| 47 | ||
| 48 | Bounces (qmail-send): | |
| 49 | * QSBMF bounce messages---both machine-readable and human-readable | |
| 50 | * HCMSSC support---language-independent RFC 1893 error codes | |
| 51 | * double bounces sent to postmaster | |
| 52 | ||
| 53 | Routing by domain (qmail-send): | |
| 54 | * any number of names for local host (control/locals) | |
| 55 | * any number of virtual domains (control/virtualdomains) | |
| 56 | * domain wildcards (control/virtualdomains) | |
| 57 | * configurable percent hack support (control/percenthack) | |
| 58 | * UUCP hook | |
| 59 | ||
| 60 | SMTP delivery (qmail-remote): | |
| 61 | * RFC 821, RFC 974, RFC 1123 | |
| 62 | * 8-bit clean | |
| 63 | * automatic downed host backoffs | |
| 64 | * artificial routing---smarthost, localnet, mailertable (control/smtproutes) | |
| 65 | * per-buffer timeouts | |
| 66 | * passive SMTP queue---perfect for SLIP/PPP (serialmail, available separately) | |
| 67 | ||
| 68 | Forwarding and mailing lists (qmail-local): | |
| 69 | * address wildcards (.qmail-default, .qmail-foo-default, etc.) | |
| 70 | * sendmail/smail /etc/aliases compatibility (qmsmac, available separately) | |
| 71 | * mailing list owners---automatically divert bounces and vacation messages | |
| 72 | * VERPs---automatic recipient identification for mailing list bounces | |
| 73 | * Delivered-To---automatic loop prevention, even across hosts | |
| 74 | * automatic subscription management (qlist) | |
| 75 | ||
| 76 | Local delivery (qmail-local): | |
| 77 | * user-controlled address hierarchy---fred controls fred-anything | |
| 78 | * mbox delivery | |
| 79 | * reliable NFS delivery (maildir) | |
| 80 | * user-controlled program delivery: procmail etc. (qmail-command) | |
| 81 | * optional new-mail notification (qbiff) | |
| 82 | * optional NRUDT return receipts (qreceipt) | |
| 83 | * conditional filtering (condredirect) | |
| 84 | ||
| 85 | POP3 service (qmail-popup, qmail-pop3d): | |
| 86 | * RFC 1939 | |
| 87 | * UIDL support | |
| 88 | * TOP support | |
| 89 | * APOP hook | |
| 90 | * modular password checking (checkpassword, available separately) |