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Turning the tide of spam and other email threats that are destroying the business value of email requires new technology. The volume of spam and other email threats is growing and the cost of protecting email systems is increasing. Most solutions use technologies that suffer serious limitations and that can be successfully circumvented by spammers and other criminals. Current technologies are ineffective because they attempt to solve the problems of spam and other email threats using techniques that became available as the problem developed. The Concentric Filtering Engine (CAFE) takes a new, service provider oriented approach and operates on a much larger scale.
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