An on-line version of this announcement is available at http://www.postfix.org/announcements/postfix-2.7.0.html
Postfix stable release 2.7.0 is available. For the past several releases, the focus has moved towards improving the code and documentation, and updating the system for changing environments.
Improved before-queue content filter performance. With "smtpd_proxy_options = speed_adjust", the Postfix SMTP server receives the entire message before it connects to a before-queue content filter. Typically, this allows Postfix to handle the same mail load with fewer content filter processes.
Improved address verification performance. The verify database is now persistent by default, and it is automatically cleaned periodically. Under overload conditions, the Postfix SMTP server no longer waits up to 6 seconds for an address probe to complete.
Support for reputation management based on the local SMTP client IP address. This is typically implemented with "FILTER transportname:" actions in access maps or header/body checks, and mail delivery transports in master.cf with unique smtp_bind_address values.
The postscreen daemon (a zombie-blocker in front of Postfix) is still too rough for a stable release, and will be made "mature" in the Postfix 2.8 development cycle (however you can use Postfix 2.7 with the Postfix 2.8 postscreen and dnsblog executables and master.cf configuration; this code has already proven itself).
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 2.7.0 at the mirrors listed at http://www.postfix.org/
The same code (but with postscreen included) is also available as Postfix snapshot 2.8-20100213. Updated versions of Postfix version 2.6, 2.5 and perhaps earlier will be released with the same fixes that were already included with Postfix versions 2.7 and 2.8.