Many sites offer paid leads for mailing list advertising. For a certain fee every month you can have a certain number of people to email with products, affiliate programs...really whatever you want. But The List Machine let's you do this for free. They do offer paid accounts, but if you are already working affiliate programs, then you have a ready-made list of referrals already.
All you need to do is click the banner link below or the link above and you'll be taken to the sign-up page. You can skip over all the pay-per-address offers and just set up a free account. With this account, you can invite people to join your downline. The great thing about The List Machine, though, is that the matrix goes both ways. You'll be email those in your upline and your downline. This means an exponential amount of referrings in two directions!
You have nothing to lose signing up for this.