Source of mfdnscheck_php:
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#! /usr/local/bin/php
<?php
/*
* Copyright (C) 2003-2004 Pawel Foremski <pjf@gna.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
***
*
* $Id: mfdnscheck.php,v 1.1 2004/07/05 18:27:21 pavcio Exp $
*
*/
error_reporting(0);
if ($_ENV['NOMFDNSCHECK'] !== NULL) exit(0);
/* get envelope sender address */
list($mail_login, $mail_domain) = split('@', $_ENV['SMTPMAILFROM'], 2);
if (!$mail_domain ) exit(); /* no domain to check */
/*
From PHP Manual:
"according to RFC 2821 when no mail exchangers are listed,
hostname itself should be used as the only mail exchanger with a
priority of 0"
so we check DNS_A too
*/
/* get DNS record */
$dnsrec = dns_get_record($mail_domain, DNS_A | DNS_MX);
if (!is_array($dnsrec) || count($dnsrec) ) exit(); /* query failed or domain exists */
fwrite(STDERR, "non existing envelope sender domain: $mail_domain\n");
exit("E552 sorry, your envelope sender domain must exists (#5.7.1)\n");
?>