We use email for many different things now: sharing information, links to entertainment, making requests. Not all emails are the same, so we shouldn't write them the same.

The ProfHacker blog at The Chronicle of Higher Education has a nice short post on "25 Verbs to Use Instead of Email" that helps frame the purpose of a message, which in turns guides how to write it.

Next time, don't just email someone. Respond, invite, share with, or amuse them.