Elham Parsaie’Mehr - M.S.c student of Islamic Azad University, science and research Khouzestan Branch
Amir Mas’oud Rahmani - Assistant professor of Islamic Azad University, science and research Tehran Branch

Nowadays, using internet has developed in many fields; so, companies and organizations will to present their services by internet. They use email for that purpose. As the regard of developing using emails, spreading spam has developed, too. This has cased many problems (consumes time and energy) for users. One of the techniques that have been presented for spam filtering is instance-based system; which has low false positive error. In this article, has been tried to enforce clustering approach. Results of experience show that this approach, not only has high accurate; but also, decrease amount of calculates and there for increase response speed.

Spam email, legitimate email, instance-based system, clustering