'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`.'

def save(self, sender):

    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
