code: protected function getEmailRecipients($email)
    {
      $recipients = $email->Headers->to . ' ' .
                    $email->Headers->cc;
      if($email->Headers->bcc != NULL)
      {
        $recipients .= ' ' . $email->Headers->bcc;  
      }
  
      return $recipients;
    }
docs: Get Email Recipients
  
  Returns the string containing all of the recipients, such as To, CC and if provided BCC
  
  @param mixed $email Email
  @return string Recipients