We are beginning to start an email marketing campaign for our newly launched Shopify Store. Shopify's Email app is a greatly appreciated addition. In trying to understand the legalities of marketing campaigns, we would like to know if it is legal to send marketing to an unsubscribed person as long as we follow the CAN-SPAM Act guidelines, etc.? (including the option to unsubscribe/opt out, include our postal address and a subject line accurately reflecting the content of the message). Your input is greatly appreciated.