function IsValidEmail($email, $checkhost=true) {
  $result[0] = true;
  $result[1] = '';
  if (!preg_match("`^[a-zA-Z][a-zA-Z0-9_-]*(?:\.[a-zA-Z0-9_-]+)*@[a-zA-Z][a-zA-Z0-9-]*(?:\.[a-zA-Z 0-9-]+)*\.[a-z]{2,6}$`", $email)) {
    $result[0] = false;
    $result[1] = 'Email est mal formé - Email is not properly formatted';
  }
  elseif ($checkhost) {
    list($username, $domain ) = split("@", $email);
    $verify = "on"; $debug = "on";
    if (function_exists('checkdnsrr')) {
      # Construct array of available mailservers
      if (getmxrr($domain, $mxhosts, $mxweight)) {
        for($i=0;$i<count($mxhosts);$i++){
          $mxs[$mxhosts[$i]] = $mxweight[$i];
        }
        asort($mxs);
        $mailers = array_keys($mxs);
      }
      elseif(checkdnsrr($domain, 'A')) {
         $mailers[0] = gethostbyname($domain);
      }
      else {
       $mailers=array();
      }
      $total = count($mailers);
      # Query each mailserver
      if ($total > 0 && $verify) {
        # Check if mailers accept mail
        for($n=0; $n < $total; $n++) {
          # Check if socket can be opened
          if ($debug) { echo "Checking server $mailers[$n]...\n";}
          $connect_timeout = 2;
          $errno = 0;
          $errstr = 0;
          $probe_address = 'postmaster@'.$domain;
          # Try to open up socket
          if ($Connect = @fsockopen($mailers[$n], 25, $errno , $errstr, $connect_timeout)) {
            $Out = fgets($Connect, 1024);
            echo $Out.'<br />';
            if (ereg("^220", $Out)) {
              fputs ($Connect, 'HELO '.$_SERVER['HTTP_HOST']."\r\n");
              $Out = fgets ( $Connect, 1024 );
              fputs ($Connect, "MAIL FROM: <$email>\r\n");
              $From = fgets ( $Connect, 1024 );
              fputs ($Connect, "RCPT TO: <$email>\r\n");
              $To = fgets ($Connect, 1024);
              echo $Out.'<br />';
              fputs ($Connect, "QUIT\r\n");
              fclose($Connect);
              if (!ereg ("^250", $From) || !ereg ( "^250", $To )) {
                $result[0]=false;
                $result[1]="Adresse rejeté par le serveur - Server rejected address";
                return $result;
                exit();
              }
            }
          }
          else {
            $result[0]= false;
            $result[1]="Pas de connexion au serveur - No connection to the server.";
          }
        }
      }
    }
  }
  return $result;
}
$valemail = IsValidEmail($nlmail, false);

* function IsValidEmail($email, $checkhost=true) {
  $result[0] = true;
  $result[1] = '';
  if (!preg_match("`^[a-zA-Z][a-zA-Z0-9_-]*(?:\.[a-zA-Z0-9_-]+)*@[a-zA-Z][a-zA-Z0-9-]*(?:\.[a-zA-Z 0-9-]+)*\.[a-z]{2,6}$`", $email)) {
    $result[0] = false;
    $result[1] = 'Email est mal formé - Email is not properly formatted';
  }
*  elseif ($checkhost) {
    list($username, $domain ) = split("@", $email);
    $verify = "on"; $debug = "on";
    if (function_exists('checkdnsrr')) {
      # Construct array of available mailservers
      if (getmxrr($domain, $mxhosts, $mxweight)) {
        for($i=0;$i<count($mxhosts);$i++){
          $mxs	

Pas de problème sans solutions