Cisco Cisco Email Security Appliance C160 Guía Del Usuario

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User Guide for AsyncOS 9.7 for Cisco Email Security Appliances
 
Chapter 13      Anti-Spam
  Testing Anti-Spam
Removing the “easy spam” using SBRS, blacklists, message filters, etc. will result in a lower overall 
catch rate percentage.
Resending spam caught by another anti-spam vendor.
Testing older messages.
The scanning engine adds and removes rules rapidly based on current threats. Testing using old 
messages will therefore lead to inaccurate test results.