ZyXEL Communications VPN Series Handbook page 588

What can go wrong
1. If Email Security is not working, there are two possible reasons:
You have not subscribed for the Email Security service.
You have subscribed for the Email Security service but the license
(Application Security) is expired.
2. You can click the link from the CONFIGURATION > Licensing > Registration screen
of your ZyXEL device's Web Configurator or click the myZyXEL.com 2.0 icon from
the portal page (https://portal.myzyxel.com/) to register or extend your
Application Security license.
www.zyxel.com
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