[progval]

> You don't really need outgoing port 25 to run your own mail server.

You do need it to send mail

[dredmorbius]

Directly, yes, but not via a smart host, which is how most SOHO mailservers (where used) are configured.

It's not quite a full-fledged, full-privilege system, but it continues to provide major benefits over Webmail or client-based (POPS, IMAPS) configurations.