Thanks for your answer. If Plesk Obsedian is installed /var/log/maillog is not "logrotated" at all. Normally, the Plesk Daily Maintenance Task processes it, which should create the /var/log/maillog.processed file and an empty /var/log/maillog file. This does for some reason not work on this...
/var/log/maillog is now 10 GB large
a /var/log/maillog.processed file is not created
There are however no maillog log parsing errors in the syslog
Aug 26 16:31:34 server systemd[1]: Started Plesk task: ext-log-browser-parse-maillog (task=53626 process=53626 trace=3105024:66cc91c6a6642).
Aug 26...