http://centennialsociety.com/business_reply/businessreply.htm

Or if this is too much work, you can fill those envelopes with anything: Your fingernail clippings, pubes, boogers. You could crush up some B-12 vitamin tablets and put the suspicious stinky yellowish powder in the envelopes to create an anthrax scare. Print up some shots of your own puckered anus for them to look at. Send a J R “Bob” Dobbs Head. Or write your own manifesto.