PHP Doku:: Ermittelt die zu einem Internet-Hostnamen passenden MX-Records - function.getmxrr.html

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getmxrr

(PHP 4, PHP 5)

getmxrrErmittelt die zu einem Internet-Hostnamen passenden MX-Records

Beschreibung

bool getmxrr ( string $hostname , array &$mxhosts [, array &$weight ] )

Sucht im DNS nach MX-Datensätzen, die zu hostname passen.

Parameter-Liste

hostname

Der Internet-Hostname.

mxhosts

Eine Liste der gefundenen MX-Einträge wird im Array mxhosts abgelegt.

weight

Wenn ein weight-Array übergeben wurde, werden darin die Gewichtungsinformationen gesammelt.

Rückgabewerte

Gibt TRUE zurück, wenn mindestens ein Datensatz gefunden wurde. Wurde kein Datensatz gefunden oder trat ein Fehler auf, wird FALSE zuürckgegeben.

Changelog

Version Beschreibung
5.3.0 Diese Funktion ist jetzt auf Windowsplattformen verfügbar.

Anmerkungen

Hinweis:

Diese Funktion sollte nicht verwendet werden, um Adressverifikation durchzuführen. Nur die im DNS gefundenen Mailserver werden zurückgegeben; daher sollte entsprechend » RFC 2821 der hostname selbst mit der Priorität 0 als einziger MX verwendet werden, wenn kein MX-Eintrag gefunden wurde.

Hinweis:

Die Funktion steht auf Windows-Plattformen nicht zur Verfügung. Verwenden Sie dort statt dessen die » PEAR-Klasse » Net_DNS.

Siehe auch

  • checkdnsrr() - Prüft DNS-Einträge auf Übereinstimmung mit einem gegebenen Internet-Host-Namen oder einer IP-Adresse
  • dns_get_record() - Fetch DNS Resource Records associated with a hostname
  • gethostbyname() - Ermittelt die zum angegebenen Internet-Hostnamen passende IPv4-Adresse
  • gethostbynamel() - Ermittelt eine Liste von IPv4-Adressen passend zum angegebenen Internet-Hostnamen
  • gethostbyaddr() - Ermittelt den zur angegebenen IP-Adresse passenden Internet-Hostnamen
  • die named(8)-Manualseite


19 BenutzerBeiträge:
- Beiträge aktualisieren...
php [spat] hm2k.org
6.01.2009 23:18
I decided to have a bash at this after doing a bit of research...

<?php

// getmxrr() support for Windows by HM2K <php [spat] hm2k.org>
function win_getmxrr($hostname, &$mxhosts, &$mxweight=false) {
    if (
strtoupper(substr(PHP_OS, 0, 3)) != 'WIN') return;
    if (!
is_array ($mxhosts) ) $mxhosts = array();
    if (empty(
$hostname)) return;
   
$exec='nslookup -type=MX '.escapeshellarg($hostname);
    @
exec($exec, $output);
    if (empty(
$output)) return;
   
$i=-1;
    foreach (
$output as $line) {
       
$i++;
        if (
preg_match("/^$hostname\tMX preference = ([0-9]+), mail exchanger = (.+)$/i", $line, $parts)) {
         
$mxweight[$i] = trim($parts[1]);
         
$mxhosts[$i] = trim($parts[2]);
        }
        if (
preg_match('/responsible mail addr = (.+)$/i', $line, $parts)) {
         
$mxweight[$i] = $i;
         
$mxhosts[$i] = trim($parts[1]);
        }
    }
    return (
$i!=-1);
}

// Define
if (!function_exists('getmxrr')) {
    function
getmxrr($hostname, &$mxhosts, &$mxweight=false) {
        return
win_getmxrr($hostname, $mxhosts, $mxweight);
    }
}

/* example */

$domain='php.net';
echo
"<pre>";
getmxrr($domain,$mxhosts,$mxweight);
print_r($mxhosts);
print_r($mxweight);

?>
feha at vision dot to
22.11.2008 15:29
On the example below if getmxrr does not exist it will try with fsockopen.
This way it works for windows without getmxrr ...

<?php
function validate_email($email)
{
//by Femi Hasani [www.vision.to]
if(!preg_match ("/^[\w\.-]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]+$/", $email))
return
false;

list(
$prefix, $domain) = split("@",$email);

        if(
function_exists("getmxrr") && getmxrr($domain, $mxhosts))
        {
        return
true;
        }
        elseif (@
fsockopen($domain, 25, $errno, $errstr, 5))
        {
        return
true;
        }
        else
        {
        return
false;
        }

}
?>
Usefull and simple solution ...
else it can be added fisrt to check os and function than create a widows version of getmxrr  ....
<?php
if(!defined("OS"))
{
@
php_uname();//detect server OS
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN')
{
   
define("OS","WIN");//define OS contsant
} else {
   
define("OS","Other");
}
}
if(!
function_exists("getmxrr") && OS == "WIN")
{

function
getmxrr ()
{
your windows version ...
}

}

?>
Hope this helps ...
TZ at inpetho dot net
12.12.2007 19:35
If greylisting is installed on the mx host then he send a "451 4.7.1 Please try again later"

My code fragment:

<?php
//...
foreach ($mx_records as $mx_host) {
   
$code = CheckMX($mx_host, $eMail);
    if (
$code == 0)    continue; // host not found
   
if ($code == 451)    $code = CheckMX($mx_host, $eMail); // Greylisting
   
if ($code == 250)    {
       
$ok = true;
        break;
    }
}
//...

function CheckMX($mx_host, $eMail)
{
   
$code = 0;
   
$fp = @fsockopen($mx_host, 25, $errno, $errstr, 2);
    if (
$fp)    {
       
send_command($fp, 'HELO microsoft.com');
       
send_command($fp, 'MAIL FROM:<support@microsoft.com>');
       
$erg = send_command($fp, 'RCPT TO:<'.$eMail.'>');
       
fclose($fp);
       
$code = intval(substr($erg, 0, 3));
    }
    return
$code;
}
//...
?>
Jay
12.09.2007 1:10
As stated, some of the code listed below will have trouble with multiple equal weights, such as if you query gmail.com. The following code will prevent that by switching the key/values.

<?php

// Get the records
getmxrr("gmail.com", $mx_records, $mx_weight);

// Put the records together in a array we can sort
for($i=0;$i<count($mx_records);$i++){
   
$mxs[$mx_records[$i]] = $mx_weight[$i];
}

// Sort them
asort ($mxs);

// Since the keys actually hold the data we want, just put those in an array, called records    
$records = array_keys($mxs);

// Simply echoes all the stuff in the records array    
for($i = 0; $i < count($records); $i++){
    echo
$records[$i];
    echo
'<br>';
}

?>

If you wanted to get the weight, you would use "array_values($mxs);" instead of "array_keys($mxs);".

Hope this helps some people.
tomhutter at web dot de
20.10.2006 21:50
Leonardt's code fails with multiple mx records with the same wight. You can easily change this by switching keys and values in the mxs array:

     for($i=0;$i<count($mx_records);$i++){
       $mxs[$mx_records[$i]] = $mx_weight[$i];
     }

     arsort ($mxs );
     reset ($mxs);

    while (list ($mx_host, $mx_weight) = each ($mxs) ) {

cheers

Tom
php dot net at oitc dot com
15.10.2006 2:28
This function has some strange side effects when dealing with aliases...

My function:

        if (getmxrr($fqdn, $mx_records, $mx_weight)) {
            // copy mx records and weight into array $mxs
            // ignore multiple mx's at the same weight
            for ($i = 0; $i < count($mx_records); $i++) {
                $mxs[$mx_weight[$i]] = $mx_records[$i];
            }
            // sort array mxs to get servers with highest priority
            ksort ($mxs, SORT_NUMERIC);
            reset ($mxs);
        } else {
            // No MX so use A
            $mxs[0]= $fqdn;
        }

fails because a $fqdn containing an alias returns a true yet on return both $mx_records and $mx_weight contain nothing!

The solution until this gets fixed is to replace if (getmxrr($fqdn, $mx_records, $mx_weight)) with

        // Handle aliases etc.
        if ($result = getmxrr($fqdn, $mx_records, $mx_weight)) {
            if(!isset($mx_records) || (count($mx_records) == 0)) $result = false;
        }
        // Process MXs
        if ($result) {

Hope this helps others....  Tom
MagicalTux at ooKoo dot org
24.09.2006 16:59
If you want to use getmxrr on windows, be careful as choward AT fast DOT net DOT NO SPAM PLZ's function has a security flaw.

It passes its argument to an external command without escaping it. If you don't validate the input, someone may manage to run nasty things on your system.

Here's a fixed version (just added escapeshellarg())

<?php
function getmxrr($hostname, &$mxhosts)
{
   
$mxhosts = array();
   
exec('%SYSTEMDIRECTORY%\\nslookup.exe -q=mx '.escapeshellarg($hostname), $result_arr);
    foreach(
$result_arr as $line)
    {
      if (
preg_match("/.*mail exchanger = (.*)/", $line, $matches))
         
$mxhosts[] = $matches[1];
    }
    return(
count($mxhosts) > 0 );
}
//--End of workaround

//test..
getmxrr('yahoo.com', $mxhosts);
print_r($mxhosts);
?>

This way you'll avoid a lot of nasty things ;)
Lennart Poot(www.twing.nl)
7.04.2006 21:23
This script validates an e-mail adress using getmxrr and fsockopen

1. it validates the syntax of the address.
2. get MX records by hostname
3. connect mail server and verify mailbox(using smtp command RCTP TO:<email>)

When the function "validate_email([email])" fails connecting the mail server with the highest priority in the MX record it will continue with the second mail server and so on..

The function "validate_email([email])" returns 0 when it failes one the 3 steps above, it will return 1 otherwise

Grtz Lennart Poot

<?
function validate_email($email){
  
$mailparts=explode("@",$email);
  
$hostname = $mailparts[1];

  
// validate email address syntax
  
$exp = "^[a-z\'0-9]+([._-][a-z\'0-9]+)*@([a-z0-9]+([._-][a-z0-9]+))+$";
  
$b_valid_syntax=eregi($exp, $email);

  
// get mx addresses by getmxrr
  
$b_mx_avail=getmxrr( $hostname, $mx_records, $mx_weight );
  
$b_server_found=0;

   if(
$b_valid_syntax && $b_mx_avail){
    
// copy mx records and weight into array $mxs
    
$mxs=array();

     for(
$i=0;$i<count($mx_records);$i++){
      
$mxs[$mx_weight[$i]]=$mx_records[$i];
     }

    
// sort array mxs to get servers with highest prio
    
ksort ($mxs, SORT_NUMERIC );
    
reset ($mxs);

     while (list (
$mx_weight, $mx_host) = each ($mxs) ) {
       if(
$b_server_found == 0){

        
//try connection on port 25
        
$fp = @fsockopen($mx_host,25, $errno, $errstr, 2);
         if(
$fp){
          
$ms_resp="";
          
// say HELO to mailserver
          
$ms_resp.=send_command($fp, "HELO microsoft.com");

          
// initialize sending mail
          
$ms_resp.=send_command($fp, "MAIL FROM:<support@microsoft.com>");

          
// try receipent address, will return 250 when ok..
          
$rcpt_text=send_command($fp, "RCPT TO:<".$email.">");
          
$ms_resp.=$rcpt_text;
          
           if(
substr( $rcpt_text, 0, 3) == "250")
            
$b_server_found=1;

          
// quit mail server connection
          
$ms_resp.=send_command($fp, "QUIT");

        
fclose($fp);

         }

       }
    }
  }
  return
$b_server_found;
}

function
send_command($fp, $out){

 
fwrite($fp, $out . "\r\n");
  return
get_data($fp);
}

function
get_data($fp){
 
$s="";
 
stream_set_timeout($fp, 2);

  for(
$i=0;$i<2;$i++)
   
$s.=fgets($fp, 1024);

  return
$s;
}

// support windows platforms
if (!function_exists ('getmxrr') ) {
  function
getmxrr($hostname, &$mxhosts, &$mxweight) {
    if (!
is_array ($mxhosts) ) {
     
$mxhosts = array ();
    }

    if (!empty (
$hostname) ) {
     
$output = "";
      @
exec ("nslookup.exe -type=MX $hostname.", $output);
     
$imx=-1;

      foreach (
$output as $line) {
       
$imx++;
       
$parts = "";
        if (
preg_match ("/^$hostname\tMX preference = ([0-9]+), mail exchanger = (.*)$/", $line, $parts) ) {
         
$mxweight[$imx] = $parts[1];
         
$mxhosts[$imx] = $parts[2];
        }
      }
      return (
$imx!=-1);
    }
    return
false;
  }
}

?>
jeff at pzenix dot com
8.03.2006 18:58
I should point out that the below example won't work with some domains (.co.uk, .org.uk, .net.uk for example) because it assumes (possibly incorrectly) that the format is [ DOMAIN ].[ EXT ].
off at NOSPAM dot abwesend dot de
11.02.2006 16:18
Concerning the message by 'rolf at rowi dot net' (do a check on a address containing a subdomain) we could use:

$email = 'abc@etpc01.trier.fh-rpl.de';
           
$strDot      = '.';
$strAfterAt  = substr(strstr($email, '@'), 1);
$chunks      = explode($strDot, $strAfterAt);
$cntChunks   = count($chunks) - 1;

$strDomain = $chunks[($cntChunks-1)] . $strDot . $chunks[$cntChunks];

if (!getmxrr( $strDomain, $mxhosts )) {
    echo 'Mailserver not found';
}

// $strDomain is set to 'fh-rpl.de';

31.08.2005 17:16
nice function for validating email-adresses! Take care on "register globals" paramter.

http://www.zend.com/zend/spotlight/ev12apr.php
richard dot quadling at bandvulc dot co dot uk
25.05.2005 11:04
Windows alternative for getmxrr without the need for PEAR.

<?php
define
('DEFAULT_GATEWAY', 'nnn.nnn.nnn.nnn');
if (!
function_exists('getmxrr'))
    {
   
/*
        This function is a replacement for the missing Windows function getmxrr.
       
        The parameters are the same as those for the normal getmxrr function.
       
        The steps this function takes are :
       
        1 - Use NSLOOKUP.EXE to get the MX records for the supplied Host.
        2 - Use regular expressions to extract the mail servers and the preference.
        3 - Sort the results by preference.
        4 - Set the return arrays.
        5 - Return true or false.
    */
   
function getmxrr($s_HostName, array &$a_MXHosts = NULL, array &$a_Weights = NULL)
        {
       
// Simulate all the required network activity by executing windows' NSLOOKUP.
       
$s_NSLookup = shell_exec("nslookup -q=mx {$s_HostName} 2>nul");
       
preg_match_all("'^.*MX preference = (\d{1,10}), mail exchanger = (.*)$'simU", $s_NSLookup, $a_MXMatches);

       
// If there is something to return ...
       
if (count($a_MXMatches[2]) > 0)
            {
           
// Produce output arrays if they have been requested.
           
$i_ArgCount = func_num_args();
            if (
$i_ArgCount > 1)
                {
               
array_multisort($a_MXMatches[1], $a_MXMatches[2]);
                switch (
$i_ArgCount)
                    {
                    case
3 :
                       
$a_Weights = $a_MXMatches[1];
                    case
2 :
                       
$a_MXHosts = $a_MXMatches[2];
                    }
                }
            return
True;
            }
        else
            {
            return
False;
            }
        }
    }
?>

You will need to know your default gateway (either it's IP address or its name).

To do this, run the program IPCONFIG /ALL at a cmd prompt and look for the Default Gateway.

Then replace the 'nnn.nnn.nnn.nnn' with the address.

Richard.
rune dot heggtveit at devzone dot progative dot com
23.01.2005 10:02
An other way to do mx-lookup on a windows platform.
Rewrote this from an other class i wrote for DNS lookup - so it might be a bit messy - but hope you get the idea.

Big thanks to the rfc community.

<?php

class mxlookup
{
      var
$dns_socket = NULL;
      var
$QNAME = "";
      var
$dns_packet= NULL;
      var
$ANCOUNT = 0;
      var
$cIx = 0;
      var
$dns_repl_domain;
      var
$arrMX = array();

      function
mxlookup($domain, $dns="192.168.2.1")
      {
        
$this->QNAME($domain);
        
$this->pack_dns_packet();
        
$dns_socket = fsockopen("udp://$dns", 53);

        
fwrite($dns_socket,$this->dns_packet,strlen($this->dns_packet));
        
$this->dns_reply  = fread($dns_socket,1);
        
$bytes = stream_get_meta_data($dns_socket);
        
$this->dns_reply .= fread($dns_socket,$bytes['unread_bytes']);
        
fclose($dns_socket);
        
$this->cIx=6;
        
$this->ANCOUNT   = $this->gord(2);
        
$this->cIx+=4;
        
$this->parse_data($this->dns_repl_domain);
        
$this->cIx+=7;

         for(
$ic=1;$ic<=$this->ANCOUNT;$ic++)
         {
          
$QTYPE = ord($this->gdi($this->cIx));
           if(
$QTYPE!==15){print("[MX Record not returned]"); die();}
          
$this->cIx+=9;
          
$mxPref = ord($this->gdi($this->cIx));
          
$this->parse_data($curmx);
          
$this->arrMX[] = array("MX_Pref" => $mxPref, "MX" => $curmx);
          
$this->cIx+=3;
         }
      }

      function
parse_data(&$retval)
      {
       
$arName = array();
       
$byte = ord($this->gdi($this->cIx));
        while(
$byte!==0)
        {
          if(
$byte==192) //compressed
         
{
           
$tmpIx = $this->cIx;
           
$this->cIx = ord($this->gdi($cIx));
           
$tmpName = $retval;
           
$this->parse_data($tmpName);
           
$retval=$retval.".".$tmpName;
           
$this->cIx = $tmpIx+1;
            return;
          }
         
$retval="";
         
$bCount = $byte;
          for(
$b=0;$b<$bCount;$b++)
          {
           
$retval .= $this->gdi($this->cIx);
          }
         
$arName[]=$retval;
        
$byte = ord($this->gdi($this->cIx));
       }
      
$retval=join(".",$arName);
     }

     function
gdi(&$cIx,$bytes=1)
     {
      
$this->cIx++;
       return(
substr($this->dns_reply, $this->cIx-1, $bytes));
     }

      function
QNAME($domain)
      {
       
$dot_pos = 0; $temp = "";
        while(
$dot_pos=strpos($domain,"."))
        {
         
$temp   = substr($domain,0,$dot_pos);
         
$domain = substr($domain,$dot_pos+1);
         
$this->QNAME .= chr(strlen($temp)).$temp;
        }
       
$this->QNAME .= chr(strlen($domain)).$domain.chr(0);
      }

      function
gord($ln=1)
      {
       
$reply="";
        for(
$i=0;$i<$ln;$i++){
        
$reply.=ord(substr($this->dns_reply,$this->cIx,1));
        
$this->cIx++;
         }

        return
$reply;
      }

      function
pack_dns_packet()
      {
       
$this->dns_packet = chr(0).chr(1).
                           
chr(1).chr(0).
                           
chr(0).chr(1).
                           
chr(0).chr(0).
                           
chr(0).chr(0).
                           
chr(0).chr(0).
                           
$this->QNAME.
                           
chr(0).chr(15).
                           
chr(0).chr(1);
      }

}

?>

<?php

/* Exampe of use: */
$mx = new mxlookup("php.net");

print
$mx->ANCOUNT." MX Records\n";
print
"Records returned for ".$mx->dns_repl_domain.":\n<pre>";
print_r($mx->arrMX);

?>

Return:

02 MX Records Records returned for php.net:

Array
(
    [0] => Array
        (
            [MX_Pref] => 15
            [MX] => smtp.osuosl.org
        )

    [1] => Array
        (
            [MX_Pref] => 5
            [MX] => osu1.php.net
        )

)
rolf at rowi dot net
21.01.2005 15:36
Be aware that not just user@example.com ist a valid address, also user@subnet.example.com is valid (but maybe less common). Just got into trouble with this check...

Rolf
siclawrence at gmail dot com
4.01.2005 15:43
This code replicates online tools that let you check if an email address is valid. First it checks if the email format is correct, then looks up and prints the mx records. All nicely formatted with fancy words that in the end prints whether the email address valid or invalid.

<?php
$email
= "email@domain.com";

print(
"Checking: $email<br>");

if (
eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)+$", $email)) {

    print(
"Format Test: PASSED<br>");
    print(
"Online host verification Test...<br><br>");
    print(
"MX Records for: $email<br>");
   
    list(
$alias, $domain) = split("@", $email);
   
    if (
checkdnsrr($domain, "MX")) {
   
       
getmxrr($domain, $mxhosts);
       
        foreach(
$mxhosts as $mxKey => $mxValue){
            print(
"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$mxValue<br>");
        }
       
        print(
"Online host verification Test: PASSED<br><br>");
        print(
"Email Status: VALID");
   
    } else {
   
        print(
"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No records found.<br>");
        print(
"Online host verification Test: FAILED<br><br>");
        print(
"Email Status: INVALID");
   
    }

} else {

    print(
"Format Test: FAILED<br><br>");
    print(
"Invalid email address provided.<br><br>");
    print(
"Email Status: INVALID");
   
}
?>
zorlac_man at hotmail dot com
14.05.2004 21:15
For some reason this and the other DNS lookup functions seem to be really slow on my Linux box. I've checked several things and have no explanation.

As a work-around, I gave in and just used a system call to dig:

<?php
CheckMX
("fakedomain.org");
CheckMX("hotmail.com");

function
CheckMX($domain) {
       
exec("dig +short MX " . escapeshellarg($domain),$ips);
        if(
$ips[0] == "") {
                print
"MX record found for $domain not found!\n";
                return
FALSE;
        }
        print
"MX Record for $domain found\n";
        return
TRUE;
}
?>

Output:

MX record found for fakedomain.org not found!
MX Record for hotmail.com found

As someone else pointed out, it is prudent to check to see if the TLD has an IP address if the MX record is not found.
ng4rrjanbiah at rediffmail dot com
26.02.2004 12:11
Here is a better workaround for Windows platform. Tested on Windows XP. Highly impressed by "geoffbrisbine A T y a h o o DOT c o m"'s idea of nslookup usage.

<?php
function getmxrr($hostname, &$mxhosts)
{
  
$mxhosts = array();
  
exec('nslookup -type=mx '.$hostname, $result_arr);
   foreach(
$result_arr as $line)
    {
      if (
preg_match("/.*mail exchanger = (.*)/", $line, $matches))
         
$mxhosts[] = $matches[1];
    }
   return(
count($mxhosts) > 0 );
}
//--End of workaround

//test..
echo getmxrr('yahoo.com', $mxhosts);
print_r($mxhosts);
?>

HTH,
R. Rajesh Jeba Anbiah
geoffbrisbine A T y a h o o DOT c o m
25.09.2002 6:39
I was pretty disappointed that the Win32 build of PHP doesn't incorporate getmxrr so, since I'm a naive newbie, I decided to hack together my own (and I stress hack).  This has been tested on Win 2000 and Win XP.  There's no reason this shouldn't work on Win NT but it will not work on Win 9x (you need the nslookup command).  It will finish with the array $mx that will be a multidimensional array with the MX preference, host name and ip address. You can do a print_r ( $mx ) to see what it looks like.

-----------------------------------------------

<?php
$command
= "nslookup -type=mx yahoo.com";
exec ( $command, $result );
   
$i = 0;
while ( list (
$key, $value ) = each ( $result ) ) {
    if (
strstr ( $value, "mail exchanger" ) ) { $nslookup[$i] = $value; $i++; }
}
   
while ( list (
$key, $value ) = each ( $nslookup ) ) {
   
$temp = explode ( " ", $value );
   
$mx[$key][0] = $temp[3];
   
$mx[$key][1] = $temp[7];
   
$mx[$key][2] = gethostbyname ( $temp[7] );
}

   
array_multisort ( $mx );
?>
paul at start dot co dot uk
16.01.2001 21:48
Prevent your dns server from 'creating' a valid host name by appending the local domain to incomplete emails by appending to the domain a  trailing . both in the pattern match and mx checks:

<?php
if (eregi("^[0-9a-z_]([-_.]?[0-9a-z])*@[0-9a-z][-.0-9a-z]*\\.[a-z]{2,3}[.]?$", $string, $check)) {
   
$host = substr(strstr($check[0], '@'), 1).".";
    if (
getmxrr($host, $validate_email_temp) )
        return
TRUE;
   
// THIS WILL CATCH DNSs THAT ARE NOT MX.
   
if(checkdnsrr($host,"ANY"))
        return
TRUE;
}
?>



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