Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
13-6
Cisco AsyncOS 9.5 for Email User Guide
Chapter 13 Anti-Spam
Cisco Intelligent Multi-Scan Filtering
Step 6
Submit and commit your changes.
Cisco
Intelligent Multi-Scan Filtering
Cisco Intelligent Multi-Scan incorporates multiple anti-spam scanning engines, including Cisco
Anti-Spam, to provide a multi-layer anti-spam solution.
Anti-Spam, to provide a multi-layer anti-spam solution.
When processed by Cisco Intelligent Multi-Scan:
•
A message is first scanned by third-party anti-spam engines.
•
Cisco Intelligent Multi-Scan then passes the message and the verdicts of the third-party engines to
Cisco Anti-Spam, which assumes responsibility for the final verdict.
Cisco Anti-Spam, which assumes responsibility for the final verdict.
•
After Cisco Anti-Spam performs its scan, it returns a combined multi-scan score to AsyncOS.
•
Combining the benefits of the third-party scanning engines and Cisco Anti-Spam results in more
caught spam while maintaining Cisco Anti-Spam’s low false positive rate.
caught spam while maintaining Cisco Anti-Spam’s low false positive rate.
You cannot configure the order of the scanning engines used in Cisco Intelligent Multi-Scan; Cisco
Anti-Spam will always be the last to scan a message and Cisco Intelligent Multi-Scan will not skip it if
a third-party engine determines that a message is spam.
Anti-Spam will always be the last to scan a message and Cisco Intelligent Multi-Scan will not skip it if
a third-party engine determines that a message is spam.
Using Cisco Intelligent Multi-Scan can lead to reduced system throughput. Please contact your Cisco
support representative for more information.
support representative for more information.
Note
The Intelligent Multi-Scan feature key also enables Cisco Anti-Spam on the appliance, giving you the
option of enabling either Cisco Intelligent MultiScan or Cisco Anti-Spam for a mail policy.
option of enabling either Cisco Intelligent MultiScan or Cisco Anti-Spam for a mail policy.
Related Topics
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Timeout for
Scanning
Single
Message
Scanning
Single
Message
Enter the number of seconds to wait for timeout when scanning a message.
Enter an integer from 1 to 120. The default value is 60 seconds.
Regional
Scanning
Scanning
Enable or disable regional scanning and if applicable, select a region.
Enable this feature only if you receive the bulk of your email from the specified
region. Because this feature optimizes the anti-spam engine for a particular region, it
can reduce capture rates for other types of spam.
region. Because this feature optimizes the anti-spam engine for a particular region, it
can reduce capture rates for other types of spam.
Option
Description