a***@gmail.com
2020-05-07 12:03:55 UTC
We have had postfix working for many years on three ports: 25, 587, 2525.
These are the processes we're using in master.cf:
smtp inet n - n - - smtpd
2525 inet n - n - - smtpd
submission inet n - n - - smtpd
We are running postfix version 2.10.1
Recently, we tried a new setup that would route all ports (25,587,2525) to port 25 on our postfix servers. The intent in doing so was so that we could increase the maxproc value for smtp, and disable the 2525/submission processes, and therefore we could pool resources/connections regardless of which port our users connect on.
However, some users reported connection timeouts after we made this change.
Does smtpd behave differently when listening on 587 vs. 25? (We have STARTTLS enabled on all ports, and the advertised commands between the different ports are identical).
These are the processes we're using in master.cf:
smtp inet n - n - - smtpd
2525 inet n - n - - smtpd
submission inet n - n - - smtpd
We are running postfix version 2.10.1
Recently, we tried a new setup that would route all ports (25,587,2525) to port 25 on our postfix servers. The intent in doing so was so that we could increase the maxproc value for smtp, and disable the 2525/submission processes, and therefore we could pool resources/connections regardless of which port our users connect on.
However, some users reported connection timeouts after we made this change.
Does smtpd behave differently when listening on 587 vs. 25? (We have STARTTLS enabled on all ports, and the advertised commands between the different ports are identical).