Let your customers list grow itself
Sourcecode Pro has an integrated Referral System allowing your customers to refer a freind and be rewarded if they sign up to a subscription! Customers can refer as many people as they want, the system also show who you were referred by!
Referral Rewards are created from Discount Coupons. Create a discount coupon and Assign it to the referral completion reward. Once a Referral Signs up and completes the sign up, They get the reward!