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23-8
User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
 
Chapter 23      Validating Recipients Using an SMTP Server
  Bypassing SMTP Call-Ahead Validation for Certain Users or Groups
Bypassing SMTP Call-Ahead Validation for Certain Users or 
Groups
You may want to enable SMTP call-ahead validation on a listener but skip the SMTP call-ahead 
validation for certain users or groups of users. 
You may want to skip SMTP call-ahead validation for recipients for whom mail should not be delayed 
during SMTP call-ahead queries. For example, you could add a RAT entry for a customer service alias 
that you know is valid and will likely need immediate attention. 
To configure bypassing SMTP call-ahead validation via the GUI, select Bypass SMTP Call-Ahead 
when you add or edit the RAT entry.