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black hole list

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Two well known methods are SPF (Sender Policy Framework) and DNS based black hole lists.
The problem can be even worse if the black hole list operator perceives that you are somehow truly at fault for the spam--either because he or she feels you did not take enough steps to prevent the misuse of your email system, or because you were, in fact, the source of the spam.
At the heart of the MX Logic Email Defense Service is MX Logic's patent-pending Stacked Classification Framework(R) -- a multi-layered spam-detection system that combines the industry's most powerful spam-fighting techniques, including Brightmail AntiSpam, industry and proprietary heuristics, reputation analysis, URL filtering and reputation-based real-time black hole lists.
 
 
 
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