When virtual gateways are configured, which two distinct attributes are allocated to each virtual gateway address? (Choose two.)

On a Cisco Email Security Appliance (ESA), Virtual Gateways are configured to manage and separate outgoing email traffic, which is crucial for sender reputation management. Each Virtual Gateway is fundamentally defined by two key attributes: a unique IP address assigned to one of the appliance's network interfaces, and an association with one or more sender domains. The ESA's Mail Flow Policies use the sender's domain to determine which Virtual Gateway (and therefore which IP address) should be used to send a particular message. This allows an organization to use different IP addresses for different types of mail (e.g., transactional vs. marketing).

C. DNS server address: DNS server settings are configured globally for the entire appliance, not on a per-virtual gateway basis.
D. DHCP server address: The appliance acts as a DHCP client to obtain an IP address; it does not have a "DHCP server address" as a configurable attribute for a gateway.
E. external spam quarantine: A spam quarantine is a policy destination for unwanted mail, not a core network attribute of a virtual gateway's identity.

1. Cisco Content Security Management Appliance Configuration Guide, 14.0: In the section "Email > Outgoing Mail," the concept of Virtual Gateways is explained. The configuration involves creating a gateway and associating it with an IP interface. The guide states, "Virtual Gateways allow you to assign a dedicated IP address...to a group of senders. You can group senders by domain..." This directly links the IP address and domain as the core attributes. (Reference: "Configuring Centralized Outgoing Mail Policies" chapter).

2. AsyncOS 15.0 for Cisco Email Security Appliances - User Guide: The chapter "Configuring the Email Pipeline," under the section "Managing Mail Delivery," details the setup of Virtual Gateways. The process explicitly requires selecting an IP interface for the gateway and then using Mail Flow Policies to route mail from specific sender groups (often defined by domain) through that gateway. This confirms that the IP address and the domain association are the defining characteristics. (Reference: Chapter "Configuring the Email Pipeline," Section "Virtual Gateways").

3. Cisco Email Security Appliance (ESA) Best Practices, Tips, and Tricks: This document emphasizes the primary use case for Virtual Gateways: "The main reason for using Virtual Gateways is for IP reputation." It details how to create a new IP interface and then a Virtual Gateway that uses that IP, and subsequently create a Mail Flow Policy that matches on a sender domain to use the new Virtual Gateway. (Reference: Section "Virtual Gateways").