Cisco Cisco Email Security Appliance C680 User Guide
Chapter 4 Validating Recipients Using an SMTP Server
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Cisco IronPort AsyncOS 7.5 for Email Advanced Configuration Guide
OL-25137-01
SMTP Call-Ahead Server Profile Settings
When you configure the SMTP Call-Ahead Server Profile, you need to configure
settings that determine how the Email Security appliance connects with the SMTP
server.
settings that determine how the Email Security appliance connects with the SMTP
server.