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MOTIVATION Common uses for mail filters include removal of Spam and of Computer Virus es. A less common use is to inspect outgoing e-mail at some companies to ensure that employees comply with appropriate laws. Users might also employ a mail filter to prioritize messages, and to sort them into folders based on subject matter or other criteria. USERS Mail filters can be installed by the User , either as an extension of the operating system, or as part of their Mail User Agent . Internet Service Provider s can also install mail filters in their Mail Transfer Agent s as a service to all of their customers. Corporations often use them to protect their employees and their IT assets. CUSTOMIZATION Mail filters have varying degrees of configurability. Sometimes they make decisions based on matching a Regular Expression . Othertimes, keywords in the message body are used, or perhaps the e-mail address of the sender of the message. Some more advanced filters, particularly anti-spam filters, use statistical Document Classification techniques such as the Naive Bayes Classifier . SEE ALSO
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