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One of the most efficient, least costly and, remarkably, most effective anti-spam techniques is IP reputation filtering. An incredibly inexpensive technique for the anti-spam gateway, IP reputation filtering can be used to identify 80 percent (or more) of spam without even looking at message content. IP reputation services have become a best practice for any anti-spam gateway. This white paper discusses the origins of IP reputation services; test results on Cisco IronPort's own reputation service, SenderBase; best practices in using reputation services; and the ROI of reputation services.
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