Pimcore\Mail::addBcc PHP Method

    public function addBcc($email)
    {
        $this->addToTemporaryStorage('Bcc', $email, '');
        return parent::addBcc($email);
    }

 /**
  * Add all Users to mail
  *
  * TODO: Use Users from Pimcore
  *
  * @param Mail $mail
  */
 public static function addAdminToMail(Mail $mail)
 {
     $mail->addBcc("*****@*****.**");
 }