<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def save(self, sender):
 """ Save the message and send it out into the wide world. :param sender: The :class:`User` that sends the message. :param parent_msg: The :class:`Message` that preceded this message in the thread. :return: The saved :class:`Message`. """

        um_to_user_list = self.cleaned_data['to']
        body = self.cleaned_data['body']

        msg = Message.objects.send_message(sender,
                                           um_to_user_list,
                                           body)

        return msg