Subject

• I would like some feedback concerning a use case

Description

I have the docker-mailserver running fine on my desktop. Host is debian buster.

I installed apticron on the host to get notified by email of potential packages upgrades.

apticron requires bsd-mailx on the host which in the end install exim4-daemon-light

I sometimes get these mail messages on host mail:

Date: Sat, 01 Aug 2020 06:25:01 +0200
From: root <root@hostname>
To: root@hostname
Subject: exim paniclog on hostname has non-zero size

exim paniclog /var/log/exim4/paniclog on hostname has non-zero size, mail system might be broken. The last 10 lines are quoted below.

2020-05-16 12:15:24 socket bind() to port 25 for address 127.0.0.1 failed: Address already in use: daemon abandoned
2020-05-16 12:16:59 socket bind() to port 25 for address 127.0.0.1 failed: Address already in use: daemon abandoned

The mail addresses setup in the docker container work fine, no complains, I just wondered if I should just ignore those mail errors from exim4 complaining or if there was a way for the host to use the mail system of the container and avoid this what seems to be a port conflict.