It seems like email is exponentially getting harder to manage all the time. One thing I've noticed is if I send a reply from my phone that has the "Sent from my phone" signature on it, then people are 100% ok with short, blunt replies where they wouldn't be without that signature.
Steve Jobs was famous for his terse replies to customer emails. e.g.
customer: "Will the forthcoming iPad support tethering?"
Jobs reply: "No"
I wonder if putting 'reply generated by short responder' at the end would make it socially acceptable