I've found many Postings here, but doesn't solve my problem. I got spam from a domain. So I enter the Domain in my ispconfig3 on "Email ⇒ Postfix Blacklist" as whole domainname (with and without the @ infront of it) But the Mails still arrive in my Account. In ispconfig Database I found my entry in "mail_access" Column "source has the Domainname, access=REJECT type = sender, active=y. Normaly all mails from this Domain should be rejected?! What are the steps to check, why they don't reject.