Sounds awful. It's a push model on someone else's terms.
Think of it this way -- would you want someone else deciding how often you'd look at their web page?
Think of it this way -- would you want someone else deciding how often you'd look at their web page?
So if that person clicked link #1, the token in the link is verified that it was created for that email address, and then it's noted in a database. In the future, if person X sends another email for that category, it won't go to that person. I'm thinking the sender wouldn't even know that the person unsubscribed