Introduction : E-mail spam has continued to increase at a very fast rate over the last couple of years. It has become a major threat for business users, network administrators and even normal users.

A study in July 1997 reported that spam messages constituted approximately 10% of the incoming messages to a corporate network.

More recently, Message Labs[1] stated in its 2006 Annual Security Report that spam activity has Increased significantly in 2006 with levels that reach 86.2% of the e-mail traffic.

The report has also indicated that largely due to the increased sophistication of robot networks, a.k.a. botnets, the spam volumes have increased by 70% over the last quarter of 2006 which in turn increased the overall email traffic by a third.

Based on projections of current analysis and trends, it was expected that by the end of 2007, spam will continue to rise, reaching a plateau at around 92% of e-mail traffic .

There is a prediction that by year 2015 spam will exceed 95% of all e-mail traffic .

Although these figures might not be accurate enough, what can be concluded is that spam volume is dramatically increasing over years.

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