"Emails require no salutations, no sign-off; there’s no need to pay attention to grammar or proper spelling. In short, none of the niceties, cum manners and formalities that have for generations served to guide social discourse. This not only debases the quality of our communication, it also renders it crass, superficial, and perforce, incomplete."
Sometimes I receive an email with like 12-112 typos and grammar worthy of a person who has JUST STARTED learning English. It takes a while to decipher what exactly the person is saying [sometimes I can't even do that]. It also doesn't add to the senders dignity.
So respect yourself and try to write with some level of decency.