dovecot--- via dovecot skrev den 2023-04-23 20:25:
>> I tried to enable it on postfix smtp_sasl_auth_enable, but it is was
>> not advertise.
>
> That is because "smtp" is not the same as "smtpd".
>
>     http://www.postfix.org/postconf.5.html#smtpd_sasl_auth_enable

port 25 should not support sasl auth, make this a override in master.cf
so it only is on port 465, or 587

when remote mta's blindly just try sasl auth on port 25 thay miss a
password, and give up, after wasting resourses in both ends
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