When you receive an e-mail off of a mailing list you don't want to be on anymore, there should be an unsubscribe link near the bottom clearly marked. Otherwise, you will need to go to the websites and contact them and request they remove you. Another way, which would be easier if you have many lists to take yourself off of, would be unsubscribe.com. It is now a free service, and it does require that you download their add-on.