It's done by basically unchecking the "Allow Administrators to send me Mail" setting in the UserCP. I was considering having it unsubscribe by userid, so you wouldn't have to login, but there'd be issues with people unsubscribing other users; at present, the logged in user is the one who's unsubscribed.
I wondered too why this wasn't a standard feature, a friend of mine's site had just recently been informed by Google that large numbers of their users had been blacklisting his mail -- which is I why I wanted this for my own board.
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