The number of overall email users around the world has been gradually declining over the last few years. The majority of people who are giving up email directly blame spam as the primary reason they no longer want to use their accounts. Over fifty percent of networks only offer a perimeter defense as a means of stopping email spam. Proper email antispam is more than mere perimeter defense. Anti spam filters are needed to actually ensure that the individual mailboxes of people remain free from cumbersome messages, viruses and malware. Ninety-seven percent of spam received is within the confines of the law and is legal. A spam filtering service can ensure that productivity remains high and the spam which usually defeats the common barriers is cleared.