An engineer is deploying a Cisco Email Security Appliance and must configure a sender group that decides which mail policy will process the mail. The configuration must accept incoming mails and…

An access list controls network access to the listener but does not define how the mail itself (accept or relay) is handled based on the recipient.

The Host Access Table (HAT) defines how the appliance handles connections based on the connecting IP address, not the recipient, and applies policies to the sender's IP.

The Recipient Access Table (RAT) on a Cisco Secure Email Gateway determines whether the appliance will accept mail for a given recipient and is crucial for relaying. For outgoing mail from internal servers, the RAT must be configured to allow relaying for the internal domains and recipients, ensuring the appliance accepts connections and relays mail originating from trusted internal sources to external destinations.

A sender list is typically part of a mail policy or HAT entry to identify specific senders but is not the primary component for configuring relaying or recipient acceptance logic itself.