If a person clicks the unsubscribe link in my emails and then decides, 3 months later, they want to receive emails again, shouldn't the system allow for that?

Sure, they can call or email me to tell me they want back on and I could do it by hand, but wouldn't their first inclination to be to go to my website and join/subscribe?

Problem is, that doesn't actually opt people back in! Please make it so submitting a DIY form for a duplicate account automatically opts in the email address submitted!