Before you add an appliance to the Email module, you should have already executed the appliance firstboot script to activate email security functions on the appliance and configured network interfaces in the V-Series Appliance manager or X-Series command-line interface (CLI). Interface information includes IP address, subnet mask, default gateway, and up to 3 DNS server IP addresses. See Forcepoint V-Series Appliance
Getting Started or the X-Series Appliance
Getting Started for more details about setting up and configuring an appliance.