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User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
 
Chapter 25      Configuring Routing and Delivery Features
  The Domain Map Feature
Figure 25-3
Masquerading Defined for a Private Listener
The Domain Map Feature
You can configure a “domain map” for listeners. For each listener you configure, you can construct a 
domain map table which rewrites the Envelope Recipient for each recipient in a message that matches a 
domain in the domain map table. This feature is similar to the sendmail “Domain Table” or Postfix 
“Virtual Table” feature. Only the Envelope Recipient is affected; the “To:” headers are not re-written by 
this feature. 
Note
The processing of the domain map feature happens immediately before the RAT and right after Default 
Domain is evaluated. See the “Understanding the Email Pipeline” chapter.