The following VMware resources are required:
VMware ESXi host version 7.0, 8.0 and 9.1.0 are supported. Versions 6.7 and below are no longer supported.
VMware vSphere Client.
Virtual Network Security appliances:
Standard virtual switch created for the monitoring ports of the virtual appliances, and attached to a physical network adapter on the ESXi server.
Important
If the appliance will be deployed in inline operational mode, a separate switch must be created for each monitoring port pair, and the switch cannot be on the management network.
A separate switch must be created for each monitoring port, and the switch cannot be on the management ports network.
Sufficient physical network adapters on the ESXi server to accommodate the Network Security monitoring ports.
In the switch security policy select Yes for all fields.

Virtual Email Security — Server appliances:
Standard virtual switch created for the Email Security — Server URL Dynamic Analysis port, and attached to a physical network adapter on the ESXi server.
Standard virtual switch created for the Email Security — Server SMTP port (if deployed in SPAN/TAP mode), and attached to a physical network adapter on the ESXi server.
Sufficient physical network adapters on the ESXi server to accommodate the Email Security — Server SMTP and URL Dynamic Analysis ports.
SPAN/TAP mode only: Promiscuous security enabled on the virtual switch created for the Email Security — Server SMTP port.