Postfix Source Code

Postfix license change

Postfix is released under a dual Eclipse Public license (EPL 2.0) and IBM Public License (IPL 1.0) (Postfix 3.1 and earlier are released under the IPL 1.0).

About this source-code archive

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 3.9 stable release

See below for past stable releases that are still supported and for releases that are no longer supported.

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

Postfix 3.9.0 Source code | GPG signature | GPG signature | 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.

Postfix 3.10 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-3.10-20241113 Source code | GPG signature | GPG signature | PGP signature | Release notes | Change log

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

Postfix non-production release(s)

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

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

postfix-3.8-20220816-nonprod introduces infrastructure for unit tests (ptest) and for mocking dependencies (pmock). Mocks make tests independent of host and network configuration, and independent of DNS. There should be no externally visible change in behavior, because test and mock code is not installed.

postfix-3.8-20220816-nonprod non-production release Source code | GPG2 signature | GPG1 signature | PGP signature | Release notes | Change log

Past stable releases (still supported)

SMTP smuggling fixes for older releases

Postfix 2.11.11 patch | GPG signature | GPG signature | PGP signature
Postfix 3.0.15 patch | GPG signature | GPG signature | PGP signature
Postfix 3.1.15 patch | GPG signature | GPG signature | PGP signature
Postfix 3.2.22 patch | GPG signature | GPG signature | PGP signature
Postfix 3.3.22 patch | GPG signature | GPG signature | PGP signature
Postfix 3.4.29 patch | GPG signature | GPG signature | PGP signature

No longer supported stable releases

Postfix 3.5

Postfix 3.5 Patchlevel 25 Source code | GPG signature | GPG signature | PGP signature | Release notes | Change log
Patch 25 gpg2-sig gpg1-sig pgp-sig | 24 gpg2-sig gpg1-sig pgp-sig | 23 gpg2-sig gpg1-sig pgp-sig | 22 gpg2-sig gpg1-sig pgp-sig | 21 gpg2-sig gpg1-sig pgp-sig | 20 gpg2-sig gpg1-sig pgp-sig | 19 gpg2-sig gpg1-sig pgp-sig | 18 gpg2-sig gpg1-sig pgp-sig | 17 gpg2-sig gpg1-sig pgp-sig | 16 gpg2-sig gpg1-sig pgp-sig | 15 gpg2-sig gpg1-sig pgp-sig | 14 gpg2-sig gpg1-sig pgp-sig | 13 gpg2-sig gpg1-sig pgp-sig | 12 gpg2-sig gpg1-sig pgp-sig | 11 gpg2-sig gpg1-sig pgp-sig | 10 gpg2-sig gpg1-sig pgp-sig | 09 gpg2-sig gpg1-sig pgp-sig | 08 gpg2-sig gpg1-sig pgp-sig | 07 gpg2-sig gpg1-sig pgp-sig | 06 gpg2-sig gpg1-sig pgp-sig | 05 gpg2-sig gpg1-sig pgp-sig | 04 gpg2-sig gpg1-sig pgp-sig | 03 gpg2-sig gpg1-sig pgp-sig | 02 gpg2-sig gpg1-sig pgp-sig | 01 gpg2-sig gpg1-sig pgp-sig

Postfix 3.4 (Final update: April 2023)

Postfix 3.4 Patchlevel 29 Source code | GPG signature | GPG signature | PGP signature | Release notes | Change log
Patch 29 gpg2-sig gpg1-sig pgp-sig | 28 gpg2-sig gpg1-sig pgp-sig | 27 gpg2-sig gpg1-sig pgp-sig | 26 gpg2-sig gpg1-sig pgp-sig | 25 gpg2-sig gpg1-sig pgp-sig | 24 gpg2-sig gpg1-sig pgp-sig | 23 gpg2-sig gpg1-sig pgp-sig | 22 gpg2-sig gpg1-sig pgp-sig | 21 gpg2-sig gpg1-sig pgp-sig | 20 gpg2-sig gpg1-sig pgp-sig | 19 gpg2-sig gpg1-sig pgp-sig | 18 gpg2-sig gpg1-sig pgp-sig | 17 gpg2-sig gpg1-sig pgp-sig | 16 gpg2-sig gpg1-sig pgp-sig | 15 gpg2-sig gpg1-sig pgp-sig | 14 gpg2-sig gpg1-sig pgp-sig | 13 gpg2-sig gpg1-sig pgp-sig | 12 gpg2-sig gpg1-sig pgp-sig | 11 gpg2-sig gpg1-sig pgp-sig | 10 gpg2-sig gpg1-sig pgp-sig | 09 gpg2-sig gpg1-sig pgp-sig | 08 gpg2-sig gpg1-sig pgp-sig | 07 gpg2-sig gpg1-sig pgp-sig | 06 gpg2-sig gpg1-sig pgp-sig | 05 gpg2-sig gpg1-sig pgp-sig | 04 gpg2-sig gpg1-sig pgp-sig | 03 gpg2-sig gpg1-sig pgp-sig | 02 gpg2-sig gpg1-sig pgp-sig | 01 gpg2-sig gpg1-sig pgp-sig

Postfix 3.3 (Final update: February 2022)

Postfix 3.3 Patchlevel 22 Source code | GPG signature | GPG signature | PGP signature | Release notes | Change log
Patch 22 gpg2-sig gpg1-sig pgp-sig | 21 gpg2-sig gpg1-sig pgp-sig | 20 gpg2-sig gpg1-sig pgp-sig | 19 gpg2-sig gpg1-sig pgp-sig | 18 gpg2-sig gpg1-sig pgp-sig | 17 gpg2-sig gpg1-sig pgp-sig | 16 gpg2-sig gpg1-sig pgp-sig | 15 gpg2-sig gpg1-sig pgp-sig | 14 gpg2-sig gpg1-sig pgp-sig | 13 gpg2-sig gpg1-sig pgp-sig | 12 gpg2-sig gpg1-sig pgp-sig | 11 gpg2-sig gpg1-sig pgp-sig | 10 gpg2-sig gpg1-sig pgp-sig | 09 gpg2-sig gpg1-sig pgp-sig | 08 gpg2-sig gpg1-sig pgp-sig | 07 gpg2-sig gpg1-sig pgp-sig | 06 gpg2-sig gpg1-sig pgp-sig | 05 gpg2-sig gpg1-sig pgp-sig | 04 gpg2-sig gpg1-sig pgp-sig | 03 gpg2-sig gpg1-sig pgp-sig | 02 gpg2-sig gpg1-sig pgp-sig | 01 gpg2-sig gpg1-sig pgp-sig

Postfix 3.2 (Final update: April 2021)

Postfix 3.2 Patchlevel 22 Source code | GPG signature | GPG signature | PGP signature | Release notes | Change log
Patch 22 gpg2-sig gpg1-sig pgp-sig | 21 gpg2-sig gpg1-sig pgp-sig | 20 gpg2-sig gpg1-sig pgp-sig | 19 gpg2-sig gpg1-sig pgp-sig | 18 gpg2-sig gpg1-sig pgp-sig | 17 gpg2-sig gpg1-sig pgp-sig | 16 gpg2-sig gpg1-sig pgp-sig | 15 gpg2-sig gpg1-sig pgp-sig | 14 gpg2-sig gpg1-sig pgp-sig | 13 gpg2-sig gpg1-sig pgp-sig | 12 gpg2-sig gpg1-sig pgp-sig | 11 gpg2-sig gpg1-sig pgp-sig | 10 gpg2-sig gpg1-sig pgp-sig | 09 gpg2-sig gpg1-sig pgp-sig | 08 gpg2-sig gpg1-sig pgp-sig | 07 gpg2-sig gpg1-sig pgp-sig | 06 gpg2-sig gpg1-sig pgp-sig | 05 gpg2-sig gpg1-sig pgp-sig | 04 gpg2-sig gpg1-sig pgp-sig | 03 gpg2-sig gpg1-sig pgp-sig | 02 gpg2-sig gpg1-sig pgp-sig | 01 gpg2-sig gpg1-sig pgp-sig

Postfix 3.1 (Final update: February 2020)

Postfix 3.1 Patchlevel 15 Source code | GPG signature | GPG signature | PGP signature | Release notes | Change log
Patch 15 gpg2-sig gpg1-sig pgp-sig | 14 gpg2-sig gpg1-sig pgp-sig | 13 gpg2-sig gpg1-sig pgp-sig | 12 gpg2-sig gpg1-sig pgp-sig | 11 gpg2-sig gpg1-sig pgp-sig | 10 gpg2-sig gpg1-sig pgp-sig | 09 gpg2-sig gpg1-sig pgp-sig | 08 gpg2-sig gpg1-sig pgp-sig | 07 gpg2-sig gpg1-sig pgp-sig | 06 gpg2-sig gpg1-sig pgp-sig | 05 gpg2-sig gpg1-sig pgp-sig | 04 gpg2-sig gpg1-sig pgp-sig | 03 gpg2-sig gpg1-sig pgp-sig | 02 gpg2-sig gpg1-sig pgp-sig | 01 gpg2-sig gpg1-sig pgp-sig

Postfix 3.0 (Final update: February 2019)

Postfix 3.0 Patchlevel 15 Source code | GPG2 signature | GPG1 signature | PGP signature | Release notes | Change log
Patch 15 gpg2-sig gpg1-sig pgp-sig | 14 gpg2-sig gpg1-sig pgp-sig | 13 gpg2-sig gpg1-sig pgp-sig | 12 gpg2-sig gpg1-sig pgp-sig | 11 gpg2-sig gpg1-sig pgp-sig | 10 gpg2-sig gpg1-sig pgp-sig | 09 gpg2-sig gpg1-sig pgp-sig | 08 gpg2-sig gpg1-sig pgp-sig | 07 gpg2-sig gpg1-sig pgp-sig | 06 gpg2-sig gpg1-sig pgp-sig | 05 gpg2-sig gpg1-sig pgp-sig | 04 gpg2-sig gpg1-sig pgp-sig | 03 gpg2-sig gpg1-sig pgp-sig | 02 sig sig | 01 sig sig

Postfix 2.11 (Final update: January 2018)

Postfix 2.11 Patchlevel 11 Source code | GPG2 signature | GPG1 signature | PGP signature | Release notes | Change log
Patch 11 (sig) (sig) (sig) 10 (sig) (sig) (sig) 09 (sig) (sig) (sig) 08 (sig) (sig) (sig) 07 (sig) (sig) (sig) 06 (sig) (sig) (sig) 05 (sig) (sig) 04 (sig) (sig) 03 (sig) (sig) 02 (sig) (sig) 01 (sig) (sig)

Postfix 2.10 (Final update: October 2016)

Postfix 2.10 Patchlevel 10 Source code | GPG2 signature | GPG1 signature | PGP signature | Release notes | Change log
Patch 10 (sig) (sig) (sig) 09 (sig) (sig) (sig) 08 (sig) (sig) 07 (sig) (sig) 06 (sig) (sig) 05 (sig) (sig) 04 (sig) (sig) 03 (sig) 02 (sig) 01 (sig)

Postfix 2.9 (Final update: October 2015)

Postfix 2.9 Patchlevel 15 Source code | GPG2 signature | GPG1 signature | PGP signature | Release notes | Change log
Patch 15 (sig) (sig) (sig) 14 (sig) (sig) 13 (sig) (sig) 12 (sig) (sig) 11 (sig) (sig) 10 (sig) (sig) 09 (sig) 08 (sig) 07 (sig) 06 (sig) 05 (sig) 04 (sig) 03 (sig) 02 (sig) 01 (sig)

Postfix 2.8 (Final update: February 2015)

Postfix 2.8 Patchlevel 20 Source code | PGP signature | PGP signature | Release notes | Change log
Patch 20 (sig) (sig) 19 (sig) (sig) 18 (sig) (sig) 17 (sig) 16 (sig) 15 (sig) 14 (sig) 13 (sig) 12 (sig) 11 (sig) 10 (sig) 09 (sig) 08 (sig) 07 (sig) 06 (sig) 05 (sig) 04 (sig) 03 (sig) 02 (sig) 01 (sig)

Postfix 2.7 (Final update: January 2014)

Postfix 2.7 Patchlevel 16 Source code | PGP signature | Release notes | Change log
Patch 16 (sig) 15 (sig) 14 (sig) 13 (sig) 12 (sig) 11 (sig) 10 (sig) 09 (sig) 08 (sig) 07 (sig) 06 (sig) 05 (sig) 04 (sig) 03 (sig) 02 (sig) 01 (sig)

Postfix 2.6 (Final update: February 2013)

Postfix 2.6 Patchlevel 19 Source code | PGP signature | Release notes | Change log
Patch 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 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 2.5 (Final update: February 2012)

Postfix 2.5 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

Postfix 2.4 (Final update: March 2011)

Postfix 2.4 Patchlevel 16 Source code | PGP signature | Release notes | Change log
Patch 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01
Patch (PGP signature ) for CVE-2011-1720 (Memory corruption in Postfix SMTP server Cyrus SASL support).
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 (Final update: August 2009)

Postfix 2.3 Patchlevel 19 Source code | PGP signature | Release notes | Change log
Patch 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01
Patch (PGP signature ) for CVE-2011-1720 (Memory corruption in Postfix SMTP server Cyrus SASL support).
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 (Final update: October 2007)

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 CVE-2011-1720 (Memory corruption in Postfix SMTP server Cyrus SASL support).
Patch (PGP signature ) for local privilege escalation on Solaris >= 2.0, Linux kernel >= 2.0, and IRIX 5.

Postfix 2.1 (Final update: May 2005)

Postfix 2.1 Patchlevel 06 Source code | PGP signature
Patch 06 05 04 03 02 01
Patch (PGP signature ) for CVE-2011-1720 (Memory corruption in Postfix SMTP server Cyrus SASL support).
Patch (PGP signature ) for local privilege escalation on Solaris >= 2.0, Linux kernel >= 2.0, and IRIX 5.

Postfix 2.0 (Final update: April 2002)

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 (PGP signature ) for CVE-2011-1720 (Memory corruption in Postfix SMTP server Cyrus SASL support).
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 (Final update: July 2003)

Postfix 1.1 Patchlevel 13 Source code | PGP signature
Patch 13 12 11 10 09 08 07 06 05 04 03 02 01
Patch (PGP signature ) for CVE-2011-1720 (Memory corruption in Postfix SMTP server Cyrus SASL support).

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

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