As we all know, Junk email or spam, is the scourge of the internet.
Many ISP's use filtering to get rid of the worst of it. However, messages from mailing lists to which you have subscribed will continue to arrive arrive.
Reputable lists always provide an option to unsubscribe, but this is usually tucked away at the bottom of the message.
Use this free online tool to automate the process of unsubscribing from mailing lists.http://www.unsubscribe.com/