protected SMailPostalParkingLot createPostalParkingLot() {
        final SMailPostalParkingLot parkingLot = new SMailPostalParkingLot();
        final SMailPostalMotorbike motorbike = new SMailPostalMotorbike();
        final String hostAndPort = fessConfig.getMailSmtpServerMainHostAndPort();
        final List<String> hostPortList = DfStringUtil.splitListTrimmed(hostAndPort, ":");