Unsubscribing from Marketing Campaign Emails

In order to be in compliance with the CAN-SPAM Act of 2003, all marketing emails must come with an Unsubscribe button. (That's why you don't see it on your templates, it's already there) When a customer clicks this, it is no longer possible to send them emails through the Marketing Campaign email blast feature. You can still send these people direct email through Ad Sales Genius, but not the campaign button through "Batch Action".