Zen Cart Coupon Single User

Want to restrict a coupon to one single customer?

This is what Coupon Single User does, but without any custom programming; just begin the coupon code with the user's email address.  So for the user joe@gmail.com, the coupon code could be joe@gmail.com or joe@gmail.com-21 or joe@gmail.com_product23. It just has to begin with the customer's email address.