Email clients such as Microsoft Outlook, Mozilla Messenger, and Microsoft Outlook Express have varying degrees of functionality in the area of filtering messages. Filtering messages at the email client level is not for every organization, as it can be confusing for users and time-consuming to set up and can cause an increased support burden. However, filtering at the client level enables the most functionality. In many cases, other anti-spam solutions covered in this book depend upon email client filtering in order to work.

POPFile is an excellent Bayesian classifier that runs natively on any POP3-capable client. POPFile also has front ends for Microsoft Outlook. Mozilla Messenger 1.6 has a native Bayesian analyzer in the early stages ...

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