code: def send(self, save_to_sent_folder=True):
          
  
          if self.object_id and not self.__is_draft:
              return RuntimeError('Not possible to send a message that is not '
                                  'new or a draft. Use Reply or Forward instead.')
  
          if self.__is_draft and self.object_id:
              url = self.build_url(
                  self._endpoints.get('send_draft').format(id=self.object_id))
              if self._track_changes:
                  # there are pending changes to be committed
                  self.save_draft()
              data = None
  
          else:
              url = self.build_url(self._endpoints.get('send_mail'))
              data = {self._cc('message'): self.to_api_data()}
              if save_to_sent_folder is False:
                  data[self._cc('saveToSentItems')] = False
  
          response = self.con.post(url, data=data)
          # response evaluates to false if 4XX or 5XX status codes are returned
          if not response:
              return False
  
          self.object_id = 'sent_message' if not self.object_id \
              else self.object_id
          self.__is_draft = False
  
          return True
docs: Sends this message
  
          :param bool save_to_sent_folder: whether or not to save it to
           sent folder
          :return: Success / Failure
          :rtype: bool