1. Introduction
With the rapid growth of the internet users, the electronic mail is becoming the most efficient, fastest and reliable medium of communication. Availability of bulk mailing software and lists of e-mail addresses harvested from millions of recipients at essentially no cost, has make the spam more harmful. Spam messages are extremely annoying for most users, as they clutter their mail boxes. It is really an easy and cheep way to send and receive the e-mail. Spammers bombard on the unknown e-mail addresses to advertise there every thing whether it is items for sale or offering to visit some adult material.