Virtual gateways are a feature that allows Cisco ESA to host multiple email domains on a single physical interface, using different IP addresses and hostnames for each domain.
When virtual gateways are configured, two distinct attributes are allocated to each virtual gateway address:
Domain, which is the email domain name that is associated with the virtual gateway address, such as mycompany.com or mydomain.com.
IP address, which is the IPv4 or IPv6 address that is assigned to the virtual gateway address, such as 199.209.31.X or 2001:db8::X.
The other options are not attributes that are allocated to each virtual gateway address on Cisco ESA.
References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 5-14 and page 5-15.
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