kontrola emailu

function try_email($email, $from){
  if(!function_exists('getmxrr')){
    return null;
  }
    $domain = preg_replace('~.*@~', '', $email);
    getmxrr($domain, $mxs);
  if(!in_array($domain, $mxs)){
    $mxs[] = $domain;
  }
    $commands = array("HELO " . preg_replace('~.*@~', '', $from),
                      "MAIL FROM: <$from>",
                      "RCPT TO: <$email>",);
    foreach($mxs as $mx){
      $fp = @fsockopen($mx, 25);
      if($fp && substr($s = fgets($fp), 0, 3) == '220'){
        while($s{3} == '-'){
          $s = fgets($fp);
        }
      foreach($commands as $command){
        fwrite($fp, "$command\r\n");
        if(substr($s = fgets($fp), 0, 3) != '250'){
          return false;
        }
          while($s{3} == '-'){
            $s = fgets($fp);
          }
      }
        return true;
      }
    }
  return false;
}

if(try_email($_POST['email_receiver'],$www_email)){
 echo "ok";
}else{
 echo "chybný email";
}