You can get multiple coupons. If you look through the Costco Canada thread it's detailed out. For your email, if it's johndoe@gmail.com, you can submit it as j.ohndoe@gmail.com, jo.hndoe@gmail.com, etc and it will get sent to the same mailbox. For the account number just bump one of the numbers up or down 1. Worked for me, but check the thread.