public static String getEmailHostName(String strEmail) {
        String strResult = "";
        log.debug(String.format("method start String[strEmail:%s]", strEmail));
        if (strEmail != null) {
            int index = strEmail.lastIndexOf("@");
            if (index >= 0) {
                strResult = strEmail.substring(index).toLowerCase();
            }
        }
        log.debug(String.format("method stop return:String[%s]", strResult));
        return strResult;
    }