public function validateEmail($emails)
 {
     $emailValidation = new Zend_Validate_EmailAddress();
     if (is_string($emails) && preg_match('~,~', $emails)) {
         $contanctEmails = explode(',', $emails);
         foreach ($contanctEmails as $email) {
             if (!$emailValidation->isValid(str_replace(" ", '', $email))) {
                 return array('error' => $emailValidation->getErrors());
             }
         }
     } elseif (is_string($emails) && !$emailValidation->isValid($emails)) {
         return array('error' => $emailValidation->getErrors());
     }
 }