You can order our software via our payment provider: Paddle.com.
Before you purchase DKIM for Exchange Server and IIS SMTP Service, you are recommended to learn more about License Agreement.
AdminSystem Software license is lifetime, but each software license is provided with a software upgrade/support period. Upon expiration you can no longer upgrade the software with your license key. If you want to subscribe one-year software update/support, please contact firstname.lastname@example.org.