Are there no way to automatically include a unsubscribe link in each email?

Due to new US laws one has to be more and more carefull. There should always be a unsubscribe link in each email send out. A simple click click link which unsubscribes the user (just as in the validation email send to new subscribers).

How can I make a link which will unsubscribe the user with 1 click only, rather than adding a link to the subsription page where they have to put in their email address and choose subscribe or unsubscribe?

Thanks