Postfix stable release 2.6.0 is available. After Postfix was declared
"complete" with version 2.3, the focus has moved towards improving
the code/documentation, and updating it for changing environments.

- Multi-instance support introduces a new postmulti(1) command to
  create/add/remove/etc. additional Postfix instances. The familiar
  "postfix start" etc.  commands now automatically start multiple
  Postfix instances.  The good news: nothing changes when you use
  only one Postfix instance. See MULTI_INSTANCE_README for details.

- Multi-instance support required that some files be moved from
  the non-shared $config_directory to the shared $daemon_directory.
  The affected files are postfix-script, postfix-files and post-install.

- TLS (SSL) support was updated for elliptic curve encryption. This
  requires OpenSSL version 0.9.9 or later. The SMTP client no longer
  uses the SSLv2 protocol by default. See TLS_README for details.

- The Milter client now supports all Sendmail 8.14 Milter requests,
  including requests for rejected recipient addresses, and requests
  to replace the envelope sender address. See MILTER_README for
  details.

- Postfix no longer adds (Resent-) From:, Date:, Message-ID: or To:
  headers to email messages with "remote" origins (these are origins
  that don't match $local_header_rewrite_clients). Adding such
  headers breaks DKIM signatures that explicitly cover non-present
  headers.  For compatibility with existing logfile processing
  software, Postfix will log ``message-id=<>'' for email messages
  that have no Message-Id header.

- Stress-adaptive behavior is now enabled by default. This allows
  the Postfix SMTP server to temporarily reduce time limits and
  error-count limits under conditions of overload, such as a malware
  attack or backscatter flood. See STRESS_README for details.

No functionality has been removed, but it is a good idea to review
the RELEASE_NOTES file for the usual minor incompatibilities or
limitations.

You can find Postfix version 2.6.0 at the mirrors listed at
http://www.postfix.org/

The same code is also available as Postfix snapshot 2.7-20090511.
Updated versions of Postfix version 2.5, 2.4 and perhaps 2.3 will
be released with the same fixes that were already included with
Postfix versions 2.6 and 2.7.

        Wietse