/**
  * Validation of given Mail Params
  *
  * @param \In2code\Powermail\Domain\Model\Mail $mail
  * @return bool
  */
 public function isValid($mail)
 {
     foreach ($mail->getAnswers() as $answer) {
         if ($answer->getValueType() === 3) {
             if (!is_array($answer->getValue())) {
                 continue;
             }
             foreach ($answer->getValue() as $value) {
                 if (!BasicFileUtility::checkExtension($value, $this->settings['misc.']['file.']['extension'])) {
                     $this->setErrorAndMessage($answer->getField(), 'upload_extension');
                     continue;
                 }
                 if (!BasicFileUtility::checkFilesize($value, $this->settings)) {
                     $this->setErrorAndMessage($answer->getField(), 'upload_size');
                     continue;
                 }
             }
         }
     }
     return $this->isValidState();
 }