- 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.
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