Effect of the multistage system against spam mail

Abstract

The extreme increase of spam mail causes many serious problems such as the heavy load of the infrastructure for the delivery of e-mail or the decline of productivity of us. In Kanazawa University, we have started to filter off spam mail by using of Interscan Message Security Suite since November of 2003, and constructed the “anti-spam system” in October of 2004. Since October of 2005, we have started to apply the scores assigned by SpamAssassin to increase the accuracy of the filtering, and introduced Symantec Mail Security 8360 at the front end on March of 2007. In this paper, we discuss about the result of analysis about the effect of the multistage system against spam mail.