Postfix start failed Address in use

BennieWoef

Hi,

Last night at 00:04, postfix tried to restart (I don´t know why). But it failed. When I try to restart it manually it shows the following error:
journalctl status postfix.service:
(Subprocesses all finished with success)

fatal: bind 0.0.0.0 port 25:: Address already in use
Failed to start Postfix MTA

When I check port 25 it says:
delivery- 1831 gromox 4u IPv6 21072 0t0 TCP *:smtp (LISTEN) users🙁("delivery-queue",pid=1815,fd=4))

When i kill job 1831, I can start postfix but then I get the postfix message:

65C5F6C44CC: to=me@myserver.xx, orig_to=me@myserver.xx, relay=none, delay=0.76, delays=0.75/0.01/0/0, dsn=4.4.1, status=deferred (connect to ::1[::1]:24: Connection refused)

Could this be that gromox is listening on IP6 while postfix tries to connect to ip4? So please help.

By the way: If I stop gromox delivery and I start postfix I can send mail but I can´t receive it.

It seems gromox and postfix are conflicting. When postfix is started gromox queue and gromox queue0delivery are not able to start.

BennieWoef

I found a possible Trigger:

The sudden restart of postfix was not that sudden. It was because a new Lets Encrypt certificate was intalled.
in /etc/grommunio-common/ssl the new certificates are installed but postfix doesn not seem to switch to the secure port

BennieWoef

The problem remains:

I tried to change ld_listen ito 24. But whenn I do so gromox-delivery wont start up anymore.
However: postfix will start then but it can't forward the mail to the gromox-delivery queue.

I tried to force smtps for postfix in master.cf by commenting out the smtp option. In that case all porgrams start up but don't communicate with each other.

I reinstalled both gromox and postfix, but no result.

BennieWoef

I found a German discussion with the same problem.

After all it appeared that the listen parameter in /etc/gromox/smtp.cfg was commented out. (Port 24) . Removing the hashtag and restarting did the job.

Still a mystery how this could happen.