A useful piece at Inside Higher Ed on sending proper email, something we've spoken about here in past.
One thing I would add that doesn't come up in the article. I'm surprised that some students approach email rather sporadically (not checking it for days, for example), and also often don't respond or acknowledge replies. I wonder if this has something to do with the way in which the more immediate contact of text/instant messaging and cell phones has pushed email out of students' central modes of daily communication. But to the best of my knowledge, for most of the business world email remains critical, so students should get in the habit of using it regularly as a means of professional contact. Anyof you out there in the alum world who have thoughts on this?