 Here's how to opt out of credit card spam mail. All you have to do is go to this website, enter your name, social security number, and your address, and you're good to go. Calling this phone number works too. Not only does opting out free up space in your mailbox, but it's also good for the environment. It takes cutting down approximately 100 million trees to produce the 41 pounds of junk mail sent per person in the U.S. every year. So by opting out, you're helping offset those greenhouse gas emissions.