[An on-line version of this announcement will be available at http://www.postfix.org/announcements/postfix-2.9.1.html]
Postfix stable release 2.9.1 is available. This contains fixes that are already part of Postfix 2.10.
The "change header" Milter request could replace the wrong header. A long header name could match a shorter one, because a length check was done on the wrong string. Reported by Vladimir Vassiliev. This was introduced with Postfix 2.3.
"sendmail -bs" segfault, due to a missing guard statement after an smtpd_check_rewrite() call was moved closer to the command processor loop. Fix by Bartek Szady. This was introduced 20111219 near the end of the Postfix 2.9 development cycle.
You can find the updated Postfix source code at the mirrors listed at http://www.postfix.org/.