About Domain-Based Delivery

InterScan™ Messaging Security Appliance (IMSA) maintains a routing table based on the domain names of recipient email addresses. IMSA then uses this routing table to route emails (with matching recipient email addresses) to specified SMTP servers using domain-based delivery. Messages destined to all other domains will be routed based on the records in the Domain Name Server (DNS).

Relay Domains and Domain-Based Delivery

The domains you configure for relay domain settings (for SMTP Message Rules) are different from the domains you configure for domain-based delivery settings (for Domain-Based Delivery).

 

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