<form action="" method="post">
			<input type="text" name="check" value="<?php if(isset($_POST["check"]))
echo($_POST["check"])?>" style="width: 274px; height: 24px;" />
			<input type="submit" value="Verify" />
</form>

<?php
if(isset($_POST["check"]))
{

$res = CheckMail(trim($_POST["check"]));
if (substr($res[0],0,3) == "250")
      echo("<strong>Result</strong>: Ok"); 
    else 
    {
      echo("<strong>Result</strong>: Bad"); 
      echo("<br/><br/> Description: ".$res[0]);
    }  
    
echo("<br/><br/><strong>Log:</strong><br/>");
$d = $res[2];
$d = str_replace("<","<", $d);
$d = str_replace(">",">", $d);
$d = str_replace("\r","<br/>", $d);
echo($d);

      
}



function CheckMail($Email) 
{ 
   $HTTP_HOST = $_SERVER["HTTP_HOST"];
   $FROM = "admin@localhost.com";

   $Return = array();  
  
   if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $Email)) 
   { 
       $Return[0] = "Bad Syntax";         
       return $Return; 
   }     

   list ( $Username, $Domain ) = split ("@",$Email); 

   if ( checkdnsrr ( $Domain, "MX" ) )  
   { 
       $log .= "MX record about {$Domain} exists.\r"; 
       if ( getmxrr ($Domain, $MXHost))  
       {              
       } 
       $ConnectAddress = $MXHost[0]; 
       
       
       $Connect = fsockopen ( $ConnectAddress, 25 ); 
      $Return[1] = $ConnectAddress;
      
       if ($Connect)   
      { 
       
       if ( ereg ( "^220", $reply = fgets ( $Connect, 1024 ) ) ) 
       { 
           
       } 
   } 
   
       else 
      { 
       
       return $Return; 
         } 
          
          } 
         else 
   

        
   $Return[0]=$to_reply;     
   $Return[2]=$log;

   return $Return; 
}
?>