Server.app 5.0.4 Mail service port change?
I'm trying to setup a server at home to do light duty email, but my ISP blocks port 25. I have signed up for a service that will redirect port 25 traffic to another port, but I can't figure out how to change the receiving port in Server.app and digging around in the terminal it's not obvious which config file I need to edit.
Has anyone done this before? Or am I just tilting at windmills here?
Mac mini server running 10.10.5 and Server.app 5.0.4, only Caching and Mail are turned on.