Cisco Cisco Email Security Appliance C160 Guía Del Usuario
Chapter 8 Anti-Spam
8-14
Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
IronPort Intelligent Multi-Scan Filtering
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.
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.
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.
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.
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.
C100 appliance.
Note
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.
appliance, giving you the option of enabling either IronPort Intelligent MultiScan
or IronPort Anti-Spam for a mail policy.