spam filter

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spam filter

A piece of software designed to delete spam or to redirect it into a folder separate from the user’s main email inbox.
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PF is a recursive numerical implementation of the exact Bayesian filtering scheme where the posterior distribution of the state is represented by a set of random samples with associated weights.
There are more than 100 additional checks, including Bayesian filtering with automated training of filters, phrase-based checks (automated and custom), sender policy framework record checks, and message quality checks.
According to the company, the program, based on Bayesian filtering technology, automatically learns by using the user's personal correspondence to increase the filtration accuracy.
It has a high spare detection rate using server-based Bayesian filtering technology that automatically adapts to each organization's email environment and also offers very low false positives through its automatic whitelist.
Over time, several techniques have been proposed to address this problem, like Bayesian Filtering Techniques (Graham, 2002), URL filtering, heuristic filtering, spam image filtering (Cosoi, 2006) and so on, but each time an acceptable solution was found, spam quickly mutated to something new and harder to catch.

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