I think this might actually be the first time I've understood that intention. Fully in agreement with your earlier comment that it was a total turd of a product - I remember a group of friends all getting access, playing with it for about 30 minutes, and then just coming away thinking what an awful experience it was, never to return. None of us were thinking of it as even vaguely email related, it basically felt like forums but worse. Or messaging but worse.