Service name : smtp Port number : 25 Transport Protocol : tcp Service Description : Simple Mail Transfer Assignee : [IESG] Contact : [IETF_Chair] Modification Date : 2017-06-05 Reference : [ RFC5321, ^ ]

  
___________   ____________________
           \ |
            \|

        /\      /\  
        )(______)(
       / __    __ \
       ) \_)  (_/ (
        \   --   /   
     /   \  __  /   \
     \_/  [    ]  \_/  
      \  / \  / \  / 
       \/   \/   \/