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To stop junk mail by sending it back, you can “return to sender” by leaving the envelope unopened, writing “Return to Sender” on it, and sticking it in the mail. You don’t need to put any postage on the envelope since the post office will return it to the company who sent it. It may take a few tries, but eventually, they should stop sending the junk mail to you. You can also use the pre-paid return envelope that came with the junk mail to get the company to stop sending mail to you. Just stuff the junk mail into the return envelope and then send that back to the company by putting it in the mail. They’ll be charged for the weight of the letter, and are likely to stop sending you junk mail if they have to pay for it to be returned. To learn how to write a note to stop junk mail, keep reading!