I trust that being quiet about it will take many years before it stops. Most of the requests come from charities that I have never donated to. One comes to mind. A good one but I don't suppose that I gave them anything (I might have). They are about taking care of donkeys.Responding to sources can be two edged. They may stop contacting you, but now your name is more "valuable" because they know that there is a real person where you live. As a result you get more junk mail. Your best option is probably to "run silent run deep". If anyone sends you anything that you do not want to be associated with just quietly throw it away Where I live we sort our trash. Paper gets recycled so you know that it is not all going to waste. It will reappear as cardboard boxes from Amazon.
Do you really believe that I am kidding? Beware. Believing in **** that isn't so isn't safe.