Hi. 1. I crated domain "mail.com" 2. Create the users into the domain "mail.com" 3. Add blacklist rules in spamfilter for each user. Example blacklist for users: Code: User (recipient): email@example.com Email (sender): firstname.lastname@example.org User (recipient): email@example.com Email (sender): firstname.lastname@example.org User (recipient): email@example.com Email (sender): firstname.lastname@example.org ISPConfig insert rules into table "spamfilter_wblist". Code: wblist_id sys_userid sys_groupid wb email 1 2 2 B email@example.com 2 2 2 B firstname.lastname@example.org 3 2 2 B email@example.com These rules work only for domain because the sys_userid is the ID of the user that is currently logged into the ispconfig interface. How to identify recipient <-> sender ? It is necessary for me for Exim mysql query. Excuse for bad English. Thank you!