did some improvements on the server.

from

dovecot -n

# 2.2.13: /etc/dovecot/dovecot.conf

# OS: Linux 3.16.0-6-amd64 x86_64 Debian 8.11

# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf

# Pigeonhole version 0.4.16 (fed8554)

# OS: Linux 4.9.0-8-amd64 x86_64 Debian 9.8

dovecot is working for days without issues, logging is running to one file

/var/log/mail.dovecot

In the logfile appears

2019-04-19 18:53:54 imap-login: Info: Login: user=<office@ourdomain.at>, method=PLAIN, rip=80.75.xx.35, lip=136.xxx.9.172, mpid=28364, TLS, session=<vDTC9uSG2opQS/Yj>

All 4 different MUAs Thunderbird are logged in the same way. They are behind a router, so they having the same remote IP.

So I cant differentiate, which MUA causes which event.

Is there a way, to identify which client raise a special event?

Am So., 14. Apr. 2019 um 12:38 Uhr schrieb Reto Brunner via dovecot <dovecot@dovecot.org>:

On Sun, Apr 14, 2019 at 12:04:36PM +0200, Martin Müller via dovecot wrote:
> relay=dovecot, delay=0.13, delays=0.07/0/0/0.06, dsn=4.3.0, status=deferred
> (temporary failure. Command output: Can't open log file
> /var/log/mail.dovecot-error: Permission denied )
>[...]
> Here the output of ls -la /var/log/mail.dovecot-error
> -rw-r--r-- 1 root root 21259 Apr 14 11:24 /var/log/mail.dovecot-error
>[...]
> Any hints for me?

Well, fix the permission errors?
Give write access to the docecot user (or whatever you use) for the log file.

Also take care if you use the systemd service, there may be other restrictions in place (ProtectSystem etc)