Postfix Source Code

Postfix was released under the IBM Public License. All Postfix source code is signed with Wietse's PGP key. See ftp://ftp.porcupine.org/mirrors/project-history/postfix/ for a more extensive archive of stable and experimental tarballs.

Postfix 2.6 stable release

See below for past stable releases.

Stable releases do not change except for bugfixes and for portability fixes. New features are tested out in experimental releases (see below).

• Postfix 2.6 Patchlevel 3 Source code | PGP signature | Release notes | Change log

Stable releases are called "Postfix a.b.c", where a is the major release number, b is the minor release number, and c is the patchlevel.

Source code changes since Postfix Version 2.6.0.

• Postfix Version 2.6 Patch 03 | 02 | 01

• Patch (PGP signature ) that back-ports the Postfix 2.7 milter_header_checks feature to Postfix 2.6. This can be used, for example, to control mail flow with Milter-generated headers that contain indicators for badness or goodness. For details, see the postconf(5) section for "milter_header_checks". Currently, all header_checks features are implemented except PREPEND.

Postfix 2.6 stable release candidate

Release candidates are made available so that people can adopt fixes before a new Postfix stable release comes out. The code may still change as new defects are discovered.

• Postfix 2.6.4 stable release candidate 2 Patch | PGP signature | Source code | PGP signature | Release notes | Change log

Postfix 2.7 experimental release

New features are tested in experimental releases. They become part of the next official release once the code has not changed for a significant amount of time. Although this code is still subject to change, it runs on all of Wietse's systems so it is production quality.

• Postfix 2.7 Snapshot 20090807 Source code | PGP signature | Release notes | Change log

Experimental releases are called "Postfix a.b-yyyymmdd", where a.b is the next official Postfix release and yyyymmdd is the release date.

Postfix 2.7 non-production release

Non-production releases contain major changes that need to be tested further before they become part of a regular snapshot release.

A non-production release includes all the features and fixes of the regular snapshot of the same or earlier date.

Postfix 2.7-20090807-nonprod provides an updated version of the experimental postscreen(8) daemon. This server implements several time-consuming checks in a single process, so that Postfix does not have to waste one SMTP server process for every zombie connection. For more information see the RELEASE_NOTES and postscreen(8) manpage.

The current prototype logs client information for statistics, and implements preliminary blocking functionality that needs to be polished further.

• Postfix 2.7-20090807-nonprod non-production release Source code | PGP signature | Release notes | Change log

Past stable releases

Postfix 2.5

• Postfix 2.5 Patchlevel 7 Source code | PGP signature | Release notes | Change log
  Patch 07 06 05 04 03 02 01

Postfix 2.4

• Postfix 2.4 Patchlevel 11 Source code | PGP signature | Release notes | Change log
  Patch 11 10 09 08 07 06 05 04 03 02 01

• Patch (PGP signature ) to add stress-adaptive behavior to the SMTP server. When some mail flood keeps all server ports busy, this feature can be used to quickly drop connections from clients that make errors, and to reduce the time that Postfix waits for a client command. This may delay some legitimate deliveries, but it will allow you to still keep some mail flowing. After the mail flood ends, Postfix reverts to its normal behavior.

Postfix 2.3

• Postfix 2.3 Patchlevel 17 Source code | PGP signature | Release notes | Change log
  Patch 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01

• Patch (PGP signature ) to add stress-adaptive behavior to the SMTP server. When some mail flood keeps all server ports busy, this feature can be used to quickly drop connections from clients that make errors, and to reduce the time that Postfix waits for a client command. This may delay some legitimate deliveries, but it will allow you to still keep some mail flowing. After the mail flood ends, Postfix reverts to its normal behavior.

Postfix 2.2 (no longer updated)

• Postfix 2.2 Patchlevel 12 Source code | PGP signature
  Patch 12 11 10 09 08 07 06 05 04 03 02 01

• Patch (PGP signature ) for local privilege escalation on Solaris >= 2.0, Linux kernel >= 2.0, and IRIX 5.

Postfix 2.1 (no longer updated)

• Postfix 2.1 Patchlevel 06 Source code | PGP signature
  Patch 06 05 04 03 02 01

• Patch (PGP signature ) for local privilege escalation on Solaris >= 2.0, Linux kernel >= 2.0, and IRIX 5.

Postfix 2.0 (no longer updated)

• Postfix 2.0 Patchlevel 20 Source code | PGP signature
  Patch 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01

• Patch to black-list domain names by their mail servers (such as Verisign's mail sink) or by their DNS servers (second revision: don't defer mail when DNS lookup fails; lookup grandparent NS records).

• Patch (PGP signature ) for local privilege escalation on Solaris >= 2.0, Linux kernel >= 2.0, and IRIX 5.

Postfix 1.1 (no longer updated)

• Postfix 1.1 Patchlevel 13 Source code | PGP signature
  Patch 13 12 11 10 09 08 07 06 05 04 03 02 01

Postfix 1.0 (no longer updated)

• Version 20010228 Patchlevel 08 Source code | PGP signature
  Patch 08 07 06 05 04 03 02 01

Postfix 0.9 (no longer updated)

• Version 19991231 Patchlevel 13 Source code | PGP signature
  Patch 13 12 11 10 09 08 07 06 05 04 03 02 01

Postfix 0.8 (no longer updated)

• Version 19990906 Patchlevel 09 Source code | PGP signature
  Patch 09 08 07 06 05 04 03 02 01