Everyone has an unsubscribe list. Customers get tired of a full inbox and conduct a “spring cleaning” of their email subscriptions, or they sign up for a seasonal reason and opt-out after. Perhaps they think they can simply search for content or offers online and haven’t seen the value of staying on your email list. Whatever the reason, you’ve got a list of unsubscribes you can’t do anything with. Or can you? With opt-in advertising, you can win those subscribers back and resubscibe email addresses to your list.