My primary Domain runs on and I am trying to setup a secondary domain on I have another Secondary Domain on the using port number 7103, I can install the new domain without any problems, but when I install the agent onto the server, launching it, it does start up, and the MTA shows as open on the server, but remains closed on the server.

Is there something that I missed?
This is a testing machine but I am trying to better understand the setup for future knowledge.