Thx jgeerts - essentially junk mail can be put into to two broad categories: ones for which your name appears on a "list" somewhere & ones that are carpet bombed across zip codes/routes.

The former has a pretty decent chance -- pretty high with reputable companies, esp mags/catalogs/credit cards/etc. The latter, it's case by case. Some honor it (eg Valpak), some have no way of suppressing you.

In either case we provide you Sender info (click on the company tab) w information in case you want to give them a piece of your mind :).