Personally, I don't want to stop the onslaught. When I get a request for a charity, it usually comes with free return-address labels, which I need. They send them to make people feel obligated to donate. I have a nice supply of them. I just throw everything else away.
I often receive pre-paid funeral offers (they know how old you are & they market pre-paid funerals to everyone over 70). They include a postage-paid envelope for my check. Instead of a check, I stuff the envelope with other junk mail advertising to weigh the envelope down so they have to pay more postage.
Or pre-paid long-term care insurance plans - complete with their "statistics" of the likelihood of my needing long-term care - strokes, heart attacks, diseases, etc. I don't get those any more after I sent this note in the return envelope: (feel free to use it)
Hi, folks:
Thank you so much for sending me the information about buying long-term care insurance. It was very thoughtful of you to remind me that I could suddenly become permanently bedridden at any time. Your genuine concern for my health & finances has touched me deeply. In this fast-paced, indifferent world, it is refreshing to see people who really care about others.
To show my sincere appreciation, I have enclosed some valuable discount coupons for your benefit. I save these coupons for
kind, thoughtful, caring, wonderful people like you. Since I believe that kindness should always be rewarded, I will continue to bestow such gifts upon you
each time you are thoughtful enough to mail me more information.
I look forward to hearing from you in the future.
PS: It was very thoughtful & generous of you to provide me with a postage-paid envelope & pay the substantial return postage – especially when the envelope was weighed down with that thick stack of valuable coupons I was thoughtful enough to enclose.