I spent the better part of an hour wondering why my postfix main.cf config changes didn’t apply on a OSX Mountain Lion server. Turns out that because “OSX Server” no longer exists (it’s just Server.app now), the postfix files specific to the Mail component of the server now live at:
This is a companion discussion topic for the original entry at https://www.funkypenguin.co.nz/note/postfix-config-on-osx-mountain-lion-server-not-where-you-expect/