[An on-line version of this announcement will be available at http://www.postfix.org/announcements/postfix-3.4.10.html]
Fixed in all supported stable releases:
Bug (introduced: Postfix 2.3): Postfix Milter client state was not properly reset after one Milter in a multi-Milter configuration failed during MAIL FROM, resulting in a Postfix Milter client panic during the next MAIL FROM command in the same SMTP session. Reported by WeiYu Wu.
This is also fixed in the upcoming Postfix 3.5.0 stable release and in the Postfix 3.6 development release.
You can find the updated Postfix source code at the mirrors listed at http://www.postfix.org/.