Peter via Postfix-users skrev den 2023-08-16 09:01:
mta to mta can use port 465 or 587 aswell for intended purpose :)
This is incorrect, MTAs should not and will not connect to any port
other than port 25 for MX traffic.
you are correct if you only have ONE mta
so its valid if both client and server is maintained from same admin,
but not if its another maintainer, ihmo this is the diffrent
If you're running both servers and relaying via a non-standard port
then it's not MX traffic, it's a form of submission or relaying but
not MX.
relaying is not port 25 ever
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