Except that's not the only use for mass e-mail. I have over 120,000 developers who subscribe to my e-mail newsletters and I suspect most subscribers would not

Except that's not the only use for mass e-mail. I have over 120,000 developers who subscribe to my e-mail newsletters and I suspect most subscribers would not consider them "Promotions." Hopefully those who care to read every week will drag them back into the main inbox but I imagine some will fall by the wayside. (Not that I'm panicking, I'm not noticing much of a/any drop in open rates at all.)