This is not the first post I've seen about this sort of email mining, and certainly see its value (though I've seen some pretty distasteful "look and my business hack! blogposts in the past of the subject).
I wonder at what point this will become so rampant that some sort of pushback happens. If there is pushback, I wonder in what form it will happen and what recourse people have.
Regardless, thanks for sharing!
