MailServe helps you set up a fully functional mail server on Mac OS X that can:
MailServe organizes each of these tasks-from the simple to the complex-into discrete panels in its user interface. This allows the user to turn the mail services on one-by-one, and turn them off individually when they're not needed.
MailServe does a lot of complicated configuring of your server beneath its Mac-like user interface. It does this in a non-invasive manner, touching as little as possible of the original system files so as to leave your system in its pristine state. And you can remove all the files installed by the MailServe, at one go, using the De-Install option in MailServe's Help menu.
Note: Now requires OS X 10.14 or later