User Guide

6-4
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 6 Sender Reputation Filtering
SenderBase Reputation Service
Figure 6-2 Sender Reputation Filtering Example
Recommended Settings for Different Sender Reputation Filtering Approaches
Depending on the objectives of your enterprise, you can implement a conservative, moderate, or
aggressive approach.
Approach Characteristics Whitelist Blacklist Suspectlist Unknownlist
Sender Base Reputation Score range:
Conservative
Near zero false
positives, better
performance
7 to 10 -10 to -4 -4 to -2 -2 to 7
Moderate
(Installation
default)
Very few false
positives, high
performance
Sender Base
Reputation Scores
are not used.
-10 to -3 -3 to -1 -1 to +10
Aggressive
Some false
positives,
maximum
performance.
This option shunts
the most mail
away from
Anti-Spam
processing.
4 to 10 -10 to -2 -2 to -1 -1 to 4
All approaches
Mail Flow Policy:
Trusted Blocked Throttled Accepted