Email Validator

<?php

class SMTP_validateEmail {
/* Validate an email address. */
function validEmail($email)
{
   $isValid = true;
   $atIndex = strrpos($email, "@");
   if (is_bool($atIndex) && !$atIndex)
   {
      $isValid = false;
   }
   else
   {
      $domain = substr($email, $atIndex+1);
      $local = substr($email, 0, $atIndex);
      $localLen = strlen($local);
      $domainLen = strlen($domain);
      if ($localLen < 1 || $localLen > 64)
      {
         // local part length exceeded
         $isValid = false;
      }
      else if ($domainLen < 1 || $domainLen > 255)
      {
         // domain part length exceeded
         $isValid = false;
      }
      else if ($local[0] == '.' || $local[$localLen-1] == '.')
      {
         // local part starts or ends with '.'
         $isValid = false;
      }
      else if (preg_match('/\.\./', $local))
      {
         // local part has two consecutive dots
         $isValid = false;
      }
      else if (!preg_match('/^[A-Za-z0-9\-\.]+$/', $domain))
      {
         // character not valid in domain part
         $isValid = false;
      }
      else if (preg_match('/\.\./', $domain))
      {
         // domain part has two consecutive dots
         $isValid = false;
      }
      else ifelse if (!preg_match('/^(\\.|[A-Za-z0-9!#%&`_=\/$'*+?^{}|~.-])+$/', str_replace("\\","",$local)))
      {
         // character not valid in local part unless
         // local part is quoted
         if (!preg_match('/^"(\\"|[^"])+"$/',str_replace("\\","",$local)))
         {
            $isValid = false;
         }
      }
      if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A")))
      {
         // domain not found in DNS
         $isValid = false;
      }
   }
   return $isValid;
}

}

$mail="[email protected]";

$mx_email_validator = new SMTP_validateEmail();
$check_mx_email = $mx_email_validator->validEmail($mail);
if (!$check_mx_email) {
    echo  "Alamat Email tidak ditemukan";
}else{
    echo  "Email Ditemukan";
}

?>