Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

IronPort Intelligent Multi-Scan incorporates multiple anti-spam scanning 
engines, including IronPort Anti-Spam, to provide an intelligent, multi-layer 
anti-spam solution. This method provides more accurate verdicts that increase the 
amount of spam that is caught but without increasing the false positives rate.

When processed by IronPort Intelligent Multi-Scan, a message is first scanned by 
third-party anti-spam engines. IronPort Intelligent Multi-Scan then passes the 
message and the verdicts of the third-party engines to IronPort Anti-Spam, which 
assumes responsibility for the final verdict. After IronPort Anti-Spam performs 
its scan, it returns a combined multi-scan score to AsyncOS. Combining the 
benefits of the third-party scanning engines and IronPort Anti-Spam results in 
more caught spam while maintaining IronPort Anti-Spam’s low false positive 
rate. 

You cannot configure the order of the scanning engines used in IronPort 
Intelligent Multi-Scan; IronPort Anti-Spam will always be the last to scan a 
message and IronPort Intelligent Multi-Scan will not skip it if a third-party engine 
determines that a message is spam.

Using IronPort Intelligent Multi-Scan can lead to reduced system throughput. 
Please contact your IronPort support representative for more information.

This feature is supported on all C-Series and X-Series appliances, except for the 
C100 appliance.

The Intelligent Multi-Scan feature key also enables IronPort Anti-Spam on the 
appliance, giving you the option of enabling either IronPort Intelligent MultiScan 
or IronPort Anti-Spam for a mail policy.