phpBB.de

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nslookup -type=MX web.de

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Server:  do-lb-a01.isp.t-ipnet.de
Address:  217.237.151.205:53

Nicht-autorisierende Antwort:
web.de  MX preference = 110, mail exchanger = mx-ha02.web.de
web.de  MX preference = 100, mail exchanger = mx-ha01.web.de

mx-ha01.web.de  internet address = 217.72.192.149
mx-ha02.web.de  internet address = 217.72.192.188

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/**
* Wrapper for php's checkdnsrr function.
*
* The windows failover is from the php manual
* Please make sure to check the return value for === true and === false, since NULL could
* be returned too.
*
* @return true if entry found, false if not, NULL if this function is not supported by this environment
*/
function phpbb_checkdnsrr($host, $type = '')
{
	$type = (!$type) ? 'MX' : $type;

	if (DIRECTORY_SEPARATOR == '\\')
	{
		if (!function_exists('exec'))
		{
			return NULL;
		}

		// @exec('nslookup -retry=1 -timout=1 -type=' . escapeshellarg($type) . ' ' . escapeshellarg($host), $output);
		@exec('nslookup -type=' . escapeshellarg($type) . ' ' . escapeshellarg($host), $output);

		// If output is empty, the nslookup failed
		if (empty($output))
		{
			return NULL;
		}

		foreach ($output as $line)
		{
			if (!trim($line))
			{
				continue;
			}

			// Valid records begin with host name:
			if (strpos($line, $host) === 0)
			{
				return true;
			}
		}

		return false;
	}
	else if (function_exists('checkdnsrr'))
	{
		return (checkdnsrr($host, $type)) ? true : false;
	}

	return NULL;
}