Translations:Complete Virtual Mail Server/amavisd spamassassin clamav/4/en

The first line of defense, is postfix itself. Postfix offers a few basic means to block spam, or rather spammers. Using  it is possible to use public DNS blacklists. There are 3 popular DNS blacklists of which one is incorporated into the other. These two lists are also the most accurate ones. The most important one is zen.spamhaus.org and as a backup bl.spamcop.net can be used. Using them with postfix is very simple. Add these domains as  in :