public HandlerAction OnAddPlainEmail(Message message)
        {
            AddPlainEmailRes response = (AddPlainEmailRes)message.Protocol;
            Guid             guid     = new Guid();

            if (response.guid == null || response.guid.Length == 0)
            {
                guid = new Guid(BigEndianTransfer.GUIDToBytes(response.guid));
            }
            clientHelper.OnAddPlainEmail(response.result, guid, response.callback);

            return(HandlerAction.TERMINAL);
        }