That's what I do with prepaid envelopes

I like what Colin McNickle at the Pittsburgh Tribune-Review does when he receives junk mail (especially political junk mail) that arrives with a postage paid envelope. Now if its a party or organization I normally support, I'll toss it in the trash. But if I get on a party or organizations I oppose, all the paper they sent me goes back in their envelope to them. After a few months of this, I stop receiving mail from groups I don't support, they don't like having to pay for envelopes that contain their own literature and no money. Too bad I can't just tape the postage paid envelope to a brick or block of iron and send that. Oh well.