God, that's been there for days. What are you playing at? Go reply to it.
Link to this | This doesn't fucking apply to me
Got an hour? watch the Inbox Zero video. Inbox Zero is the idea that you 1. stop checking email all the time & check it once or twice a day only, and 2. you look at each email once and then do something with it – delete it, archive it, copy details out of it, forward it, or reply to it. Seriously, watch the video. It'll explain it all.