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Chapter 26. Creating a Mail Server > Adding Spam and Virus Protection

Adding Spam and Virus Protection

Modern mail servers can no longer just send and deliver mail. They must now also examine the content of a message to determine whether it poses a threat or nuisance to users. Without effective spam and virus filtering, valid email communications are likely to be overlooked in mailboxes filled with garbage.

Until recently, the only server-based solutions for spam and virus filtering were commercial packages that cost thousands of dollars. Today, two very popular open source applications are available that can quickly and easily add state-of-the-art protection to your Postfix MTA: ClamAV and SpamAssassin. ClamAV provides protection against all the latest viruses and features continuously updated virus definitions. SpamAssassin uses several techniques to identify and grade spam; it has become so popular that it forms the basis for several commercial systems, including the Barracuda Firewall.


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