Commands

SMTP uses commands  and response  to transfer  message between a client  and a  server.

 Each  commands  or reply  is terminated by a two character ( carriage return and lien feel)  end of line token .

Commands

Commands  are sent from the client to the server. The  format of a command is shown below it consists  of a keyword followed by  zero or more arguments. SMTP define 14 commands. The first five are  mandatory. Every  implementation must support these  fie commands.  The next  three are often  used and highly recommended. The last six  are seldom used.