Resolved MS Outlook IMAP cannot connect

[Dominik_]

Server operating system version

Ubuntu 20.04

Plesk version and microupdate number

plesk obsidian Version 18.0.54 Update #4

This is the message I get:

maillog:
Sep 6 20:58:05 dovecot: imap-login: Login: user=<>, method=DIGEST-MD5, rip=127.0.0.1, lip=127.0.0.1, mpid=592378, secured, session=<l6DOUrUENN/AAAB>
Sep 6 20:58:05 dovecot: service=imap, user=, ip=[127.0.0.1]. Disconnected: Logged out rcvd=512, sent=11322

I tried both, Dovecot and Courier. POP3 lets me connect but I don't get to see any emails, sending works. Similar with Courier, it says it works but I'm not seeing anything.
I checked with webmail that there are incoming emails though.

Any ides what could be misconfigured or is this a common issue? I don't really know where to get any additional infos

 

[Dominik_]

Update: Reinstalling Plesk Premium Mail Extension (and installing it's dependencies) seems to have fixed it