Cisco Cisco Email Security Appliance C370D ユーザーガイド

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Chapter 9      Anti-Virus
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Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
Figure 9-5
Flow Diagram for Anti-Virus Actions
Note
If you configure multi-layer anti-virus scanning, the Cisco 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 Cisco IronPort appliance 
performs the anti-virus actions (repairing, quarantining, etc.) defined for the mail 
policy.