preview.php

<?php
/**
 * ListMessenger Pro - Classic Mailing List Management
 * For the most recent version, visit https://listmessenger.com.
 *
 * @copyright 2002-2022 Silentweb https://silentweb.ca
 * @author Matt Simpson <msimpson@listmessenger.com>
 * @license /licence.html ListMessenger Software Licence Agreement
 */

// Setup PHP and start page setup.
ini_set('include_path', str_replace('\\', '/', dirname(__FILE__)).'/includes');
ini_set('allow_url_fopen', 1);
ini_set('session.name', md5(dirname(__FILE__)));
ini_set('session.use_trans_sid', 0);
ini_set('session.cookie_lifetime', 0);
ini_set('session.cookie_secure', 0);
ini_set('session.referer_check', '');
ini_set('error_reporting', E_ALL ^ E_NOTICE);
ini_set('magic_quotes_runtime', 0);

require_once 'pref_ids.inc.php';
require_once 'config.inc.php';
require_once 'classes/adodb/adodb.inc.php';
require_once 'dbconnection.inc.php';

session_start();

if ((!empty($_SESSION['isAuthenticated'])) && ((bool) $_SESSION['isAuthenticated'])) {
    if (!empty($_SESSION['html_message'])) {
        echo urldecode($_SESSION['html_message']);
    }
}