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CHAPTER
41-1
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
41
Optimizing the Appliance for Outbound Mail
Delivery Using D-Mode
• Feature Summary: D-Mode for Optimized Outbound Delivery, page 41-1
• Setting Up the Appliance for Optimized Outbound Mail Delivery, page 41-3
• Sending Bulk Mail Using IronPort Mail Merge (IPMM), page 41-4
Feature Summary: D-Mode for Optimized Outbound Delivery
D-Mode is a feature key-enabled feature that optimizes certain Email Security appliances for outbound
email delivery. Features specific to inbound mail handling are disabled in D-Mode.
• Features Unique to D-Mode-Enabled Appliances, page 41-1
• Standard Features Disabled in D-Mode-Enabled Appliances, page 41-2
• Standard Features Applicable to D-Mode-Enabled Appliances, page 41-2
Features Unique to D-Mode-Enabled Appliances
• 256 Virtual Gateway Addresses - The Cisco Virtual Gateway technology allows you to configure
enterprise mail gateways for all domains you host — with distinct IP addresses, hostname and
domains — and create separate corporate email policy enforcement and anti-spam strategies for
those domains, while hosted within the same physical appliance. See information about
“Customizing Listeners” in Chapter 5, “Configuring the Gateway to Receive Email.”
• IronPort Mail Merge (IPMM) - IronPort Mail Merge (IPMM) removes the burden of generating
individual personalized messages from customer systems. By removing the need to generate
thousands of individual messages and transmit them between message generating systems and the
email gateway, users benefit from the decreased load on their systems and increased throughput of
email delivery. For more information, see Sending Bulk Mail Using IronPort Mail Merge (IPMM),
page 41-4.
• Resource-conserving bounce setting - You can configure D-Mode-enabled appliances to detect
potential blocked destinations and bounce all messages bound for that destination. For more
information, see Configuring Resource-Conserving Bounce Settings, page 41-3.
• Enhanced performance for outbound delivery