Cisco Cisco Email Security Appliance C680 Mode D'Emploi

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Chapter 9      Anti-Virus
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Cisco IronPort AsyncOS 7.1 for Email Configuration Guide
OL-22158-02
Figure 9-6
Flow Diagram for Anti-Virus Actions
Note
If you configure multi-layer anti-virus scanning, the IronPort appliance performs 
virus scanning with the McAfee engine first and the Sophos engine second. It 
scans messages using both engines, unless the McAfee engine detects a virus. If 
the McAfee engine detects a virus, the IronPort appliance performs the anti-virus 
actions (repairing, quarantining, etc.) defined for the mail policy.