Paypal IPN URGENT

Bonjour.
J'ai instaler un script paypal qui fonctionne parfaitement en sandbox mais des que je le met en prod il ne fonctionne plus j'aimerais savoir d'ou peut venir le probléme .

<?php  

$email_account = " @hotmail.fr";
$req = 'cmd=_notify-validate';

foreach ($_POST as $key => $value) {
    $value = urlencode(stripslashes($value));
    $req .= "&$key=$value";
}
//Stoket paypal ne rien modifier ici sauf ligne 22 en cas de Maj de paypal 
//SANBOX $fp = fsockopen ('ssl://www.sandbox.paypal.com', '443', $errno, $errstr, 30);
$header = "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Host: www.paypal.com\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

foreach ($_POST as $key => $value) {
    $value = urlencode(stripslashes($value));
    $req .= "&$key=$value";
}

//$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);

 //récuperation des Variable $_Post
$item_name = $_POST['item_name'];
$payment_status = $_POST['payment_status'];
$payment_amount = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id = $_POST['txn_id'];
$receiver_email = $_POST['receiver_email'];

//Variable personalisé 
$id = $_POST['custom'];
parse_str($_POST['custom'], $custom);

$sommeTotalJr = '01.00';  //vérification de la somme. 
$detail = "Transaction Valide";

if (!$fp) {

} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
    $res = fgets ($fp, 1024);
    if (strcmp ($res, "VERIFIED") == 0) {
        // vérifier que payment_status a la valeur Completed
        // En dev mettre Pending en prod Completed PENDING
        if ( $payment_status == "Completed") {
          //vérification de l'email si = a émail de vues
               if ( $email_account == $receiver_email) {
                //bon régard que le mec veut pas nous arnaquér 
                  if ( $payment_amount == $sommeTotalJr)  {

                        include_once dirname(__FILE__).'/../../modeles/paypal/jr/paypalvalide.php';
                    file_put_contents("log",print_r($_POST,true));
                    exit();
                    }
            else 
               { //tentative de fraude 

             include_once dirname(__FILE__).'/../../modeles/paypal/jr/paypalnonvalide.php';
              file_put_contents("log",print_r($_POST,true));
                   }
                }
            }
        else {
            //erreur de payment. 
         include_once dirname(__FILE__).'/../../modeles/paypal/jr/paypalInvalide.php';
          file_put_contents("log",print_r($_POST,true));
       }

   }
    else if (strcmp ($res, "INVALID") == 0) {
    include_once dirname(__FILE__).'/../../modeles/paypal/jr/paypalErreur.php';
    $msg = 'Message de l\'IPN : '.$res;
    mail(' 3@live.fr', 'erreur IPN', $msg);

    }
}
fclose ($fp);
}