diff --git a/server/cron_debug.php b/server/cron_debug.php
new file mode 100644
index 0000000000000000000000000000000000000000..615a56d7434b64912d6b114874d20164db0a7117
--- /dev/null
+++ b/server/cron_debug.php
@@ -0,0 +1,72 @@
+<?php
+
+/*
+Copyright (c) 2007-2016, Till Brehm, projektfarm Gmbh
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+    * Neither the name of ISPConfig nor the names of its contributors
+      may be used to endorse or promote products derived from this software without
+      specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+define('SCRIPT_PATH', dirname($_SERVER["SCRIPT_FILENAME"]));
+require SCRIPT_PATH."/lib/config.inc.php";
+require SCRIPT_PATH."/lib/app.inc.php";
+
+set_time_limit(0);
+ini_set('error_reporting', E_ALL & ~E_NOTICE);
+
+// make sure server_id is always an int
+$conf['server_id'] = intval($conf['server_id']);
+
+// Load required base-classes
+$app->uses('ini_parser,file,services,getconf,system,cron,functions');
+$app->load('libdatetime,cronjob');
+
+// Path settings
+$path = SCRIPT_PATH . '/lib/classes/cron.d';
+
+//** Get commandline options
+$cmd_opt = getopt('', array('cronjob::'));
+
+if(isset($cmd_opt['cronjob']) && is_file($path.'/'.$cmd_opt['cronjob'])) {
+	// Cronjob that shell be run
+	$cronjob_file = $cmd_opt['cronjob'];
+} else {
+	die('Usage example: php cron_debug.php --cronjob=100-mailbox_stats.inc.php');
+}
+
+// Load and run the cronjob
+$name = substr($cronjob_file, 0, strpos($cronjob_file, '.'));
+if(preg_match('/^\d+\-(.*)$/', $name, $match)) $name = $match[1]; // strip numerical prefix from file name
+include $path . '/' . $cronjob_file;
+$class_name = 'cronjob_' . $name;
+$cronjob = new $class_name();
+
+$cronjob->onPrepare();
+$cronjob->onBeforeRun();
+$cronjob->onRunJob();
+$cronjob->onAfterRun();
+
+die("finished.\n");
+
+?>