Do you get those letters from finance companies saying you have been pre-approved for a loan or a credit card?
Often they have pre-paid return envelopes.
Now that’s an opportunity too good to miss.
Send it back to them complete with whatever other sales letters you got that day (don’t leave your address on anything though) or send them back folded sheets of newspaper or any rubbish to hand.
Or you can be creative – fill the envelope with confetti or shredded sales leaflets.
They pay the postage whatever the contents. It’s their envelope – you’re just returning it to them.
If we all return the envelopes then perhaps they’ll stop sending out the stupid letters that we don’t want.