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

You do need it to send mail

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.

You definitely need outbound port 25/587 if you want to send email to others.

You need an outgoing mail server, but ISPs provide those, and typically don't block port 587.

Yes. Some allow it after a shibboleet phone call.