Response code to successful FHST command is 111. DATA Tells the server to start receive the body of the message. 200 Enter message. Single dot '.' on line terminates. After response 200 the message lines are submitted to the server one after another.
Message is terminated by the line that contains a single dot '.'.
The termination of the message is acknowledged by the server with the response code 107. Server does not notify client about receiving the single message lines. Because of this all dots or at least dots that are standing alone in the line have to be quoted. SEND Sends the message. If commands FROM, TO and DATA are successfully given before SEND command, the message is delivered to the target user.