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Cisco Cisco Email Security Appliance X1070 Mode D'Emploi

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Cisco IronPort AsyncOS 7.5 for Email Advanced Configuration Guide
OL-25137-01
Chapter 4      Validating Recipients Using an SMTP Server
Figure 4-1
SMTP Call Ahead Server Conversation Workflow 
1.
The sending MTA initiates an SMTP conversation.
2.
The Email Security appliance suspends the SMTP conversation while it sends 
a query to the SMTP server to verify the recipient, validuser@recipient.com.
Note
If SMTP routes or LDAP routing queries are configured, these routes 
will be used to query the SMTP server. 
3.
The SMTP Server returns a query response to the Email Security appliance.
 
MAIL FROM: user@sender.com
RCPT TO: validuser@recipient.com
Sending MTA
SMTP Server
START HERE
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Email Security appliance
Conversation with sending MTA
Conversation with Call-Ahead 
Server