Green Upgrader did a bit of research on what the post office will do should you actually use this “Return to Waster” stamp and they report:

for Bulk Mail (the things addressed to “RESIDENT”) if you stamp it and return it the Post Office just ends up recycling it, unless the marketer paid a little extra for a forwarding or return service which they do to make sure their lists are accurate and up to date. First class mail which a lot of credit card applications and other letters use will be returned to the sender.

Post from: Blisstree

Return to Waster