On August 15, 2023 2:15:21 AM GMT+02:00, Jon Smart via Postfix-users
<postfix-users@postfix.org> wrote:
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.
On 16.08.23 10:01, Jon Smart via Postfix-users wrote:
How can I disable auth on port 25? I really don't want users to use port
25 for auth sender. i am using postfix version 3.6.4 on ubuntu 22.04.
disable smtp_sasl_auth_enable - it's disabled by default and only enabled on
ports 465/587 in master.cf.
some admins may enable it in main.cf because of historical reasons.
simply commenting it out should help
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