Sends this message

        :param bool save_to_sent_folder: whether or not to save it to
         sent folder
        :return: Success / Failure
        :rtype: bool

def send(self, save_to_sent_folder=True):
        """ Sends this message

        :param bool save_to_sent_folder: whether or not to save it to
         sent folder
        :return: Success / Failure
        :rtype: bool
        """

        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