code: def smtp_greet(self):
          
          # Policy check was done when accepting the connection so we don't have
          # to do it here again.
          primary_hostname = self._command_parser.primary_hostname
          reply_text = '%s Hello %s' % (primary_hostname, self._message.peer.remote_ip)
          self.reply(220, reply_text)
docs: This method handles not a real smtp command. It is called when a new
          connection was accepted by the server.