Email is a convenient communication channel, but it is also a medium where virus, spam mail, and porno mail can be illegally distributed. Rampant distribution of these illegal emails has caused a waste of resources and a lot of trouble to email users. Many network management firms and email software systems have allowed users to customize email filters to sort emails, but users still need to spend a lot of time setting up conditions and rules one by one. In this study, a simple individualized email filtering tool is designed. This filter can be used as a plug-in for Outlook Express to automatically sort and manage incoming emails. Based on user's personal habit of sending and receiving emails, this mechanism can analyze personal contact book and construct rules by email senders, so that incoming emails can be automatically sorted by the rules. Without any manual setting, all the incoming emails will be stored in different folders, depending on the location of the senders in the contact book, to achieve automatic individualized email sorting.
