Email: you get too much of it already, you’ll get waaaay too much of it at Harvard. It is arguably the most important communication tool on campus. Professors will use it. You’ll use it. Your friends will use it, everyone in your club/house/organization will use it.
Thus, it’s important to understand the rules of emailing, or else people will start to tune you out.
(BTW, am still getting into the tandem of posting, so forgive me for this late post.)