Cisco Cisco Email Security Appliance C160 Mode D'Emploi

The SenderBase Reputation Score (SBRS) is a numeric value assigned to an IP 
address based on information from the SenderBase Reputation Service. The 
SenderBase Reputation Service aggregates data from over 25 public blacklists 
and open proxy lists, and combines this data with global data from SenderBase to 
assign a score from -10.0 to +10.0, as follows:

The lower (more negative) the score, the more likely that a message is spam. A 
score of -10.0 means that this message is “guaranteed” to be spam, while a score 
of 10.0 means that the message is “guaranteed” to be legitimate. 

Using the SBRS, you configure the IronPort appliance to apply mail flow policies 
to senders based on their trustworthiness. (You can also create message filters to 
specify “thresholds” for SenderBase Reputation Scores to further act upon 
messages processed by the system. For more information, refer to “SenderBase 
Reputation Rule” and “Bypass Anti-Spam System Action” in the “Using Message 
Filters to Enforce Email Policies” chapter in the Cisco IronPort AsyncOS for 
Email Advanced Configuration Guide.)

Most likely to be a source of spam

Neutral, or not enough information to make a recommendation

Most likely to be a trustworthy sender