code: def dmail_list(self, message_matches=None, to_name=None, to_id=None,
                     from_name=None, from_id=None, read=None):
          
          params = {
              'search[message_matches]': message_matches,
              'search[to_name]': to_name,
              'search[to_id]': to_id,
              'search[from_name]': from_name,
              'search[from_id]': from_id,
              'search[read]': read
              }
          return self._get('dmails.json', params, auth=True)
docs: Return list of Dmails. You can only view dmails you own
          (Requires login).
  
          Parameters:
              message_matches (str): The message body contains the given terms.
              to_name (str): The recipient's name.
              to_id (int): The recipient's user id.
              from_name (str): The sender's name.
              from_id (int): The sender's user id.
              read (bool): Can be: true, false.