Hello to all of you! ;-)

My first post on this list. I frequently get this error in dovecot.log every time a user logs in and out:

============================= imap(mailaddress): Error: quota: Unknown namespace: Trash

When I change my conf.d/90-quota.conf from "Trash" to ".Trash" (as this is the imap/maildir folder name, the error stays the same, but with the ".Trash" in dovecot.log This is what my 90-quoato.conf looks like:

============================= plugin { quota_rule = *:storage=2G quota_rule2 = Trash:storage=+100M quota_grace = 10%% }

Where can I start my search, what is going wrong? Just for letting you know: This mailserver is a fresh and clean setup. I am using postfix/dovecotvimbadmin/mysql/spamassassin/clamsmtp.

Cheers, Michael