MailChimp has submitted its new iPhone App, so expect to see it in the store anytime soon. MailChimp users can include QR Coded coupons in their mailings. The QR Code, which is automatically generated, is unique and is encoded with how many times the coupon can be redeemed. The new app called Pyow! enables the store owner to sync with MailChimp and determine the validity of the coupon (video below).