Ooooh, that would be pretty handy. I've been relying on good old "please reply above this line" to parse inbound emails, precisely because I didn't want to muck around with ML to infer user intent (I reeeeally wish quotes, the reply-date separator, and signature blocks were standardized somehow). If there's a reliable improvement to this functionality provided by my email service, that's 100% a feature I'm willing to pay for. Thanks.