Spam is the general title given to unwanted messages delivered to a victim. These messages are predominantly in the form of an email, although recent trends in spam delivery are also exploiting SMS , MMS and VoIP. It is said that the majority of traffic that passes across the Internet is actually spam, often distributed with the aid of a Botnet of some description. Although spam filters reduce the amount of unwanted spam an average user would receive, spammers are adopting a multitude of techniques to overcome these filters. In particular, with respect to email, spammers are utilizing a large variety of different attachment formats, including MP3.