Table "spamfilter_users" is not cleaned up
The table "spamfilter_users" does not seem to get cleaned up correctly. When deleting email-domains or clients, none of the corresponding table entries in "spamfilter_users" are deleted. This is NOT due to #3657 (wrong sys_userid) - even when setting the sys_userid manually to a client, the entries remain after deleting that client (or his domain).
This error does not occur when the a postbox account is deleted.