protected function _addRecipientAndHeader($headerName, $email, $name)
    {
        $email = $this->_filterEmail($email);
        $name  = $this->_filterName($name);
        // prevent duplicates
        $this->_recipients[$email] = 1;
        $this->_storeHeader($headerName, $this->_formatAddress($email, $name), true);
    }