def send_empty_data(self):
        send_data = Reply(command=b'[SEND_DATA]')
        self.reply_queue.append(send_data)

        self.io.send_command(b'.')

        if 'PIPELINING' not in self.extensions:
            self._flush_pipeline()

        return send_data
Sends a line with a single ``.`` to indicate an empty message. If
dataset/ETHPy150Open slimta/python-slimta/slimta/smtp/client.py/Client.send_empty_data