After starting the mail conversation and telling the server who the recipient or recipients are, you use the DATA command to send the body of the message. The syntax for the DATA command is very simple:
DATA
After you get the standard 354 response, send the body of the message followed by a line with a single period to indicate that the body is finished. When the end of message line is received, the server will respond with a 250 reply code.
Note The body of the message can also include several header items like Date, Subject, To, Cc, and From.