King0770-Notes-Postconf or localconfig
Postconf or localconfig
For Admins out there wanting to change their Postfix settings, and also want changes to the main.cf to survive upgrades, you maybe asking yourself what's the best method.
Edit main.cf directly or add the postfix line to the localconfig.xml file?
zmlocalconfig -e postfix_<some_postfix_parameter>
Currently, the best method is to apply your customization with postconf directly to the main.cf file, and reapply it after each upgrade. Only values defined in /opt/zimbra/conf/zmmta.cf are substituted from localconfig/ldap.