I've somehow got myself into a situation where the mta trusted relay network setting is 'stuck'. Changes I make in the admin interface seemed to be saved OK, and can be viewed using zmprov gacf, but never take effect in the postfix configuration. I can even manually change main.cf to reflect what the setting should be, but it is still overwritten when zimbra restarts with the 'old' setting.
I ran zmslapcat and found the config entry in the LDAP database seems to also contain the 'old' value even though zmprov gacf returns the correct 'new' entry.
Any pointers would be appreciated.