The spammers have effectively proved there is no realistic way of stopping Spam at the source so you must block it in order to prevent employee interruptions. Effectively catching the Spam in Quarantine is the first step. This paper explains that using the most robust and comprehensive Spam signature databases like Pyzor, DCC or Razor is the foundation of identifying Spam. Next using sophisticated algorithms like fuzzy logic (not exact matching like the databases above but probabilistic matching), Bayesian filtering (statistical filtering) and finally customized databases for your specific environment.
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