41pounds.org will stop your junk mail. When you sign up for their service, 41pounds.org will donate $15 to Grist, which is a great source of nonprofit, independent environmental journalism.
Visit this page and fill in the information requested. It takes 5 minutes and only costs $41 for 5 years. That is roughly $8.20 a month. Cheap!
Do something good for the Earth today. If you happen to like junk mail, give a gift to someone else!