Yes, I have set everything up according to the docs. I tried a little more today. I was able to find out that I can check the mails using the command
sudo -u git -H bundle exec rake gitlab:incoming_email:check RAILS_ENV=production
The result is now as follows:
Checking Incoming Email ...
Incoming Email: ... Checking Reply by email ...
IMAP server credentials are correct? ... Checking gitlab@mydomain.xyz
Checking servicedesk@mydomain.xyz
yes
Mailroom enabled? ... no
Try fixing it:
Enable mail_room
For more information see:
doc/administration/reply_by_email.md
Please fix the error above and rerun the checks.
MailRoom running? ... can't check because of previous errors
Checking Reply by email ... Finished
Checking Incoming Email ... Finished
I've already tried a few things to activate mail_room, but I just can't do it. Does anyone have any ideas?