public function addEmails($bookID, $emails, $additionalParams = [])
    {
        if (empty($bookID) || empty($emails)) {
            return $this->handleError('Empty book id or emails');
        }

        $data = array(
          'emails' => json_encode($emails),
        );

        if ($additionalParams) {
            $data = array_merge($data, $additionalParams);
        }

        $requestResult = $this->sendRequest('addressbooks/' . $bookID . '/emails', 'POST', $data);

        return $this->handleResult($requestResult);
    }