[An on-line version of this announcement will be available at https://www.postfix.org/announcements/postfix-3.6.5.html]
These releases catch up with portability fixes that are also part of Postfix 3.7.0. This will be the last update for Postfix version 3.3.
Glibc 2.34 implements closefrom(). This was causing a conflict with Postfix's implementation for systems that have no closefrom() implementation.
Support for Berkeley DB version 18.
You can find the updated Postfix source code at the mirrors listed at https://www.postfix.org/.