Aweber Responder is a full featured multi follow up autoresponder system.

Affiliate program is two-tier, and pays 20% and 10% residual commissions on all monthly/yearly service fees.

Tracked by CGI scripting, database, and five year cookies. Free accounts also tagged with your affiliate ID and if the referral upgrades you’re paid due commissions. All messages sent out through the free account have your affiliate link embedded as well.