On August 15, 2023 2:15:21 AM GMT+02:00, Jon Smart via Postfix-users
<postfix-users@postfix.org> wrote:
>Hello,
>
>I have disabled port 587/465 to be accessed publicly.
>
>but port 25 must be open to internet for MTA communications.
>
>My question is, can external users access port 25 for smtp auth and send
>mail then?
Not if you disable auth on port 25, which you should. For MTA to MTA
communication you don't need smtp auth enabled to receive mails destined to
your server.
Your users should use ports 465/587 with auth to send their mail. Auth should
only be enabled on the ports you intend to use for mail submission.
--
Christian Kivalo
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