I get crap from AARP in the mail all the time. Right in the circular file it goes.
I enjoy placing a brick into a large brown envelope, taping the AARP first class return envelope on it, wrapping it securely with clear packaging tape, and dropping in a mailbox.
Hey, why not load up the return postage free envelope with all your extra unwanted junk mail and send it back? They have to pay the postage. 2 birds one stone.