code: def get_message_plain_text(msg: Message):
      
      if msg.body:
          return msg.body
  
      if BeautifulSoup is None or not msg.html:
          return msg.html
  
      plain_text = '\n'.join(line.strip() for line in
                             BeautifulSoup(msg.html, 'lxml').text.splitlines())
      return re.sub(r'\n\n+', '\n\n', plain_text).strip()
docs: Converts an HTML message to plain text.
  
      :param msg: A :class:`~flask_mail.Message`
      :return: The plain text message.