severity 921205 important
thanks

The user is getting daily warning emails, thus important.

Here we observe the deamon being started, but no evidence of it ever
being stopped.

1. Please ensure the deamon being stopped is also logged! Thank you.

Anyway, every day I poweroff, so it is indeed stopped, but never logged.

Anyway, you can see the week when the problem started... in the middle of
January.

The problem surely simply is: you didn't check if the deamon really got
stopped when doing the prerm scripts, I bet!

No, there is nothing else certainly trying to get port 25 during
upgrades. Else it would have tried at boot.

# zgrep daemon *
mainlog:2019-02-04 08:45:57 exim 4.92-RC5 daemon started: pid=911, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.1:2019-02-03 16:08:55 exim 4.92-RC4 daemon started: pid=850, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.1:2019-02-03 16:58:04 socket bind() to port 25 for address (any IPv6) 
failed: Address already in use: daemon abandoned
mainlog.2.gz:2019-01-31 06:19:56 exim 4.92-RC4 daemon started: pid=916, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.3.gz:2019-01-30 06:44:45 exim 4.92-RC4 daemon started: pid=907, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.4.gz:2019-01-29 06:30:45 exim 4.92-RC4 daemon started: pid=919, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.4.gz:2019-01-29 21:11:45 exim 4.92-RC4 daemon started: pid=868, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.5.gz:2019-01-28 08:26:03 exim 4.92-RC4 daemon started: pid=858, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.5.gz:2019-01-28 09:27:08 socket bind() to port 25 for address (any 
IPv6) failed: Address already in use: daemon abandoned
mainlog.5.gz:2019-01-28 19:46:25 exim 4.92-RC4 daemon started: pid=880, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.6.gz:2019-01-27 22:30:06 exim 4.92-RC4 daemon started: pid=895, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.7.gz:2019-01-17 06:40:15 exim 4.92-RC4 daemon started: pid=903, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.8.gz:2019-01-16 08:27:59 exim 4.92-RC4 daemon started: pid=941, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.8.gz:2019-01-16 18:41:14 exim 4.92-RC4 daemon started: pid=913, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
mainlog.9.gz:2019-01-15 19:18:06 exim 4.92-RC4 daemon started: pid=944, -q30m, 
listening for SMTP on port 25 (IPv6 and IPv4)
paniclog:2019-02-03 16:58:04 socket bind() to port 25 for address (any IPv6) 
failed: Address already in use: daemon abandoned
# ls -og
total 56
-rw-r----- 1  748 02-04 08:57 mainlog
-rw-r----- 1 7779 02-03 23:38 mainlog.1
-rw-r----- 1  384 01-11 00:09 mainlog.10.gz
-rw-r----- 1  826 02-03 16:08 mainlog.2.gz
-rw-r----- 1 1290 01-30 13:44 mainlog.3.gz
-rw-r----- 1 1028 01-29 23:41 mainlog.4.gz
-rw-r----- 1 1024 01-28 23:46 mainlog.5.gz
-rw-r----- 1  406 01-28 00:00 mainlog.6.gz
-rw-r----- 1  915 01-17 12:40 mainlog.7.gz
-rw-r----- 1 1893 01-16 23:41 mainlog.8.gz
-rw-r----- 1  750 01-15 23:48 mainlog.9.gz
-rw-r----- 1  117 02-03 16:58 paniclog
-rw-r----- 1    0 2017-03-23  rejectlog
-rw-r----- 1  131 2017-03-22  rejectlog.1

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