... and I find one effect of this (very nice, and seemingly quite accurate) categorization on me is that I actually end up viewing "promotional" emails in a mor

... and I find one effect of this (very nice, and seemingly quite accurate) categorization on me is that I actually end up viewing "promotional" emails in a more positive light. Now they're not being shoved in my face, not obscuring personal email (which used to be a problem with the old single inbox: I'd miss email from my mom amongst a bunch of random low-value emails), and not sending me annoying alerts on my phone. I don't have to skip past reams of "promotions" when I want to open that email from a friend I got a few days ago. I don't think I see, or open, or "open" promotional email any more or less often than before, but now that it's more on my terms, my mood when I do so is better. For companies that use promotional email in an honest and straight-forward manner, I suspect the net result of this change may be positive... it's not just about "opens", it's also about the impression your email makes and how that effects peoples' attitude towards your company/service.