Also from my anecdotal experience it's possible google is a bit smart about unsubscribe links. My tiny blog has "unsubscribe" as part of its URL, it's truly one

Also from my anecdotal experience it's possible google is a bit smart about unsubscribe links. My tiny blog has "unsubscribe" as part of its URL, it's truly one-click unsub and doesn't do anything clever like user agent checking or JS actions. Nevertheless, I see 8 gmails that still have email notifications on, and 3 that have unsubbed at some point.