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I know that residential ISPs block outgoing port 25 because of the spam issue. Is it common for them to block it incoming as well? You don't really need outgoing port 25 to run your own mail server.


> 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.




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