Postfix 2.6.5 has been released a few days ago during my holiday and I jut finished installing and testing it on my test server and it all works as one should expect. There are no major changes in this release just some bugfixes which had not affected my systems.

The official release note for 2.6.5.

The stable release Postfix 2.6.5 addresses the defects described below (some already addressed with the not-announced Postfix 2.6.3 release). These defects are also addressed in the legacy releases that are still maintained: Postfix 2.5.9, 2.4.13 and 2.3.19.

Do not use Postfix 2.6.4, 2.5.8, 2.4.12, 2.3.18, 2.7-20090807, and 2.7-20090807-nonprod. These contain a DNS workaround that causes more trouble than it prevents. It is removed until further notice.

Defects fixed with Postfix 2.6.3, 2.5.9, 2.4.13 and 2.3.19:

  • The Postfix Milter client got out of step with a Milter application after the application sent a “quarantine” request at end-of-message time. The Milter application would still be in the end-of-message state, while Postfix would already be working on the next SMTP event, typically, QUIT or MAIL FROM. In the latter case, Milter responses for the previously-received email message would be applied towards the next MAIL FROM transaction. This problem was diagnosed with help from Alban Deniz.

Defects fixed with Postfix 2.6.5, 2.5.9, 2.4.13 and 2.3.19:

  • The Postfix SMTP server would abort with an “unexpected lookup table” error when an SMTPD policy server was mis-configured in a particular way.

For instructions on how to upgrade Postfix please read Upgrading Postfix.