From InfoWorld, this useful review of the following anti-spam applications for use on the enterprise level: Brightmail Anti-Spam Enterprise Edition Version 5.1, FrontBridge TrueProtect E-mail Security Suite, Postini Perimeter Manager Enterprise Edition, Proofpoint Protection Server 1.2.1, and SpamAssassin 2.44, an open source spam filter included with Red Hat Linux 9.
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