Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
Chapter 7 Reputation Filtering
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Cisco IronPort AsyncOS 7.1 for Email Configuration Guide
OL-22158-02
Moderate
A moderate approach is to block messages with a SenderBase Reputation Score
lower than -3.0, throttle between -3.0 and 0, apply the default policy between 0
and +6.0, and apply the trusted policy for messages with a score greater than +6.0.
Using this approach ensures a very small false positive rate while achieving better
system performance (because more mail is shunted away from Anti-Spam
processing).
lower than -3.0, throttle between -3.0 and 0, apply the default policy between 0
and +6.0, and apply the trusted policy for messages with a score greater than +6.0.
Using this approach ensures a very small false positive rate while achieving better
system performance (because more mail is shunted away from Anti-Spam
processing).
Aggressive
An aggressive approach is to block messages with a SenderBase Reputation Score
lower than -2.0, throttle between -2.0 and 0.5, apply the default policy between 0
and +4.0, and apply the trusted policy for messages with a score greater than +4.0.
Using this approach, you might incur some false positives; however, this approach
maximizes system performance by shunting the most mail away from Anti-Spam
processing.
lower than -2.0, throttle between -2.0 and 0.5, apply the default policy between 0
and +4.0, and apply the trusted policy for messages with a score greater than +4.0.
Using this approach, you might incur some false positives; however, this approach
maximizes system performance by shunting the most mail away from Anti-Spam
processing.
Note
Users are also recommended to assign all messages with a SenderBase Reputation
Score greater than 6.0 to the $TRUSTED policy.
Score greater than 6.0 to the $TRUSTED policy.
Table 7-2
Recommended Phased Approach to Implementing Reputation
Filtering using the SBRS
Filtering using the SBRS
Policy
Blacklist
Throttle
Default
Whitelist
Conservative
-10 to -4
-4 to -2
-2 to 7
7 to 10
Moderate
-10 to -3
-3 to -1
-1 to 6
6 to 10
Aggressive
-10 to -2
-2 to -0.5
-0.5 to 4
4 to 10