I'm trying to figure out how spamfilter works. Actually I have to create a spamfilter user to use white/blacklist. But there is not check againt this user as I can see, so, email@example.com can create a user called firstname.lastname@example.org Is this ok ? Is not possible to use whitelist and blacklist with no need to create spamfilter user? Is possibile to set postfix whitelist/blacklist privileges to certain users? For example, VPS administrator should be able to filter at postfix level, hosting users should not.