also try making a few posts on cl. be sure to include your email address in the body of your ad, and also in the respond to box. check the box that says its ok to contact this seller with other offers. post some bogus thing your trying to sell in a sellers section. Post some general thing in some of the social sections. It will get you the most spam if you do this in one of the larger cities, or even multiple cities.
just be sure to make a fake email for your testing or your new filter will be working overtime forever. LOL