Before sending mail for the first time, make sure that you understand how to give a mail address . ... Enter the command: mail username @ address . You will then be prompted to enter the subject of your mail message. ... Enter the subject title and press <Return> . ... Enter the text of your message. ... Press the <Return> key whenever you want to start a new line. ... To send the mail message press <Return> to start a new line and type a full stop. Press the <Return> key again. ...