Recently, I gave you some tips about writing emails and asked for your suggestions as well. Here is a valid one from Mark W. Consider this when you are addressing others:
Since email is so quick and easy vs. a well-written letter on Crane stationary w/ a Mont Blanc fountain pen, people tend to be very casual and, more often then not, never address the person they are writing to using Mr., Mrs. Ms., Dr. and so forth. I often see Dear John, Hey Jane, Hi You, Hey Becky. Fortunately, it is less common when you do not know the person you may be writing to, for instance on a job application.
In other words, I think when it is appropriate, email correspondence can be enhanced with some formality. Ultimately, demonstrating respect still has merit in a world of instant messaging. Social media doesn’t need to be absent of essential decorum.
It’s also a good idea to sign your name after your message and include your contact information.