Don't keep your recipient guessing to the end of the note about who you are. E-mail messages also include a subject head. Think of this as the headline or title of your note. People who receive a lot of mail sort through it by viewing the sender and the subject line. Be brief and informative.
Most people use two returns to separate paragraphs.
Different e-mail software interprets tabs and spaces in different ways. Two returns between paragraphs is the surest way that your e-mail will look the same to the recipient as it does to you. Many people forget to conclude their e-mail messages. E-mail is an informal way of communicating. Choose a format that is comfortable to you and expressive of who you are.