Reported by M Roji: I found some bug, that make my script not working properly. The bug is the code in file /usr/local/ispconfig/interface/web/mail/ajax_get_json.php ``` $dkim_strength = $app->functions->intval($mail_config['dkim_strength']); if ($dkim_strength=='') $dkim_strength = 2048; ``` The right way is ``` $dkim_strength = $app->functions->intval($mail_config['dkim_strength']); if ($dkim_strength==0) $dkim_strength = 2048;