The inner working of a Bayesian spam filter
The Bayesian Theory, when applied to spam mail, is a very effective method of detecting which emails are legitimate or not. Bayesian filters calculate the probability of a message being spam according to its content. The more emails it sees, the more effective it gets. At first, the filter will not be perfect, but if you provide it with hundreds of emails to analyze, it should eventually achieve approximately 99.5% of efficiency.
At the Geeks are Sexy blog.
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