Cisco Cisco Email Security Appliance X1070 Fehlerbehebungsanleitung

  

Document ID: 118406

Updated: Oct 13, 2014

Contributed by Nasir Shakour and Enrico Werner, Cisco TAC Engineers.

    

    

●

This document describes why the sending IP address of an Email Security Appliance (ESA) can
have a low SenderBase Reputation Score (SBRS) and how this can be fixed.

SenderBase scores are attributed to IP addresses and range from -10 to +10, reflecting the
likelihood that a IP address is trying to send spam. Highly negative scores indicate senders who
are very likely to be sending spam; highly positive scores indicate senders who are unlikely to be
sending spam. When companies first begin to use Cisco's SenderBase Reputation Service, they
may discover that SBRS score for their Mail Transfer Agent's (MTA) is "None" or in low positive
territory. An enterprise discovering that they have a "None" or low positive score should not be
concerned. Cisco never recommends that mail be throttled or blocked for any positive score. A
typical MTA score in the range of 0 to 3.5 is nothing to be concerned about. "None" or low positive
scores may reflect any of a number of factors including:

Lack of history for a particular IP address

●

Low volume of mail for a particular IP address

●

Low or occasional history of complaints for a particular IP address

●

Negative scores, however, are a cause for concern. They indicate that the IP address in question