17. The computer system of claim 13 further comprising a portion for classifying at least one email message as belonging to a single category from a group of categories consisting of: spam; legitimate email; and unknown.
13. A computer system for reducing false classifications during Bayesian filtering, the computer system comprising: a portion for, within a context of Bayesian filtering, analyzing content of at least one document to be classified; a portion for determining whether more than a threshold amount of the content of the at least one document is known, wherein the portion for determining whether more than a threshold amount of the content of the at least one document is known further comprises a portion for performing at least one step from a group of steps consisting of: determining a percentage of words of the at least one document that are known from Bayesian filter training; and determining a percentage of a maximum correction value utilized during Bayesian filtering of the at least one document; and a portion for classifying the document responsive to results of the determination.