docs: def get_log_format(server=_DEFAULT_SERVER):
      '''
      Get the active log format for the SMTP virtual server.
  
      :param str server: The SMTP server name.
  
      :return: A string of the log format name.
      :rtype: str
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' win_smtp_server.get_log_format
      '''
      log_format_types = get_log_format_types()
      format_id = _get_wmi_setting('IIsSmtpServerSetting', 'LogPluginClsid', server)
  
      # Since IIsSmtpServerSetting stores the log type as an id, we need
      # to get the mapping from IISLogModuleSetting and extract the name.
      for key in log_format_types:
          if six.text_type(format_id) == log_format_types[key]:
              return key
      _LOG.warning('Unable to determine log format.')
      return None