Important  Multiple appliances controlled by a single Email Security Gateway manager share the same hybrid service configuration settings, regardless of appliance mode (cluster or standalone). If you need to register more than 1 appliance with the hybrid service from the same Email Security manager, you should: 1. Add all your appliances to the Email Security Gateway manager (Settings > General > Email Appliances). 2. Create an appliance cluster, if desired (Settings > General > Cluster Mode). 3. Enter your Email Security Gateway Anywhere subscription key (Settings > General > Subscription). 4. Register with the hybrid service (Settings > Hybrid Service > Hybrid Configuration). If your appliances are operating in standalone mode, register from the appliance on which you entered the subscription key. You may need to add an appliance after you have registered with the hybrid service (for example, after a new appliance purchase). In this situation, you should add the new appliance to the Email Security Gateway manager, then register your existing appliance with the hybrid service again without changing any configuration settings. Hybrid service configuration is synchronized across all appliances after you re-register.