public function getPrivacyHelper()
    {
        if ($this->privacyHelper === null) {
            $this->privacyHelper = new PrivacyHelper(
                $this->partFactoryService->getMimePartFactory(),
                $this->partFactoryService->getUUEncodedPartFactory(),
                $this->partBuilderFactory,
                $this->getGenericHelper(),
                $this->getMultipartHelper()
            );
        }
        return $this->privacyHelper;
    }