public function addRecipientToEmailList($recipientAddress, $emailList) {
        $entry = $this->newEmailListRecipientEntry();
        $who = $this->newWho();
        $who->email = $recipientAddress;
        $entry->who = $who;
        $address = $this->getBaseUrl() .  self::APPS_EMAIL_LIST_PATH . '/' .
            $emailList . self::APPS_EMAIL_LIST_RECIPIENT_POSTFIX . '/';
        return $this->insertEmailListRecipient($entry, $address);
    }