The latest Postfix releases are now available in my yum repos and include the following fixes.
Fixed in Postfix 3.3:
Postfix did not support running as a PID=1 process, which complicated Postfix deployment in containers. The "postfix start-fg" command will now run the Postfix master daemon as a PID=1 process if possible.
Segfault in the postconf(1) command after it could not open a Postfix database configuration file due to a file permission error (dereferencing a null pointer).
Fixed in Postfix 3.3, 3.2, 3.1, 3.0:
The luser_relay feature became a black hole, when the luser_relay parameter was set to a non-existent local address (i.e. mail disappeared silently).
Missing error propagation in the tlsproxy(8) daemon could result in a segfault after TLS handshake error (typically, dereferencing a 0xffff...ffff pointer). This daemon handles the TLS protocol when a non-whitelisted client sends a STARTTLS command to postscreen(8).
Fixed in Postfix 3.2, 3.1, 3.0:
Added more than 20 missing *_maps parameter names to the default proxy_read_maps setting, making the proxymap service easier to use.
To avoid spurious warning messages, the postconf(1) command now scans only built-in or service-defined parameter values (including their $name expansions) for ldap, *sql, etc. database names.