docs: def process(self, message, user):
          """
          Process a message.
          """
          if not self._socket:
              self.connect()
              self.lhlo()
          else:
              self.rset()
  
          if not self.dlmtp:
              raise DspamClientError('DLMTP mode not available')
  
          self.mailfrom(client_args='--process --deliver=summary')
          self.rcptto((user,))
          self.data(message)
  
          # check for valid result format
          if 'class' not in self.results[user]:
              raise DspamClientError(
                  'Unexpected response format from server at END-OF-DATA, '
                  'an error occured')
  
          return self.results[user]