[An on-line version of this announcement will be available at https://www.postfix.org/announcements/postfix-3.6.4.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/. Wietse