Trend Micro InterScan M Series, Administrator'S Manual

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How InterScan Gateway Security Appliance Works
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Logging in to the Email Reputation Services Site
You can fine-tune ERS settings by logging in to the ERS site and making your
changes there.
To fine-tune Email Reputation Services:
1. Visit the following URL:
https://nrs.nssg.trendmicro.com
2. Log in to Email Reputation Services with your InterScan Gateway Security
Appliance Activation Code.
3. Follow the instructions in the ERS user interface to modify settings.
How Email Reputation Services Works
ERS blocks spam by comparing the IP address of an SMTP server to lists containing
the IP addresses of known spam distributors.
For example, Sam, in Seattle, sends an email message to John in Los Angeles. John's
SMTP server is behind an InterScan Gateway Security Appliance and ERS is enabled
with the Standard setting selected. When InterScan Gateway Security Appliance
receives the email message sent from Sam's SMTP server to John's SMTP server, it
first checks Server A's IP address against the Standard Reputation database. If Sam's
SMTP server IP address is not on the list, InterScan Gateway Security Appliance
sends the email to John's SMTP server. However, if Sam's SMTP server IP address is
on the list, InterScan Gateway Security Appliance takes the defined action.
If the administrator chose Advanced setting in the Email Reputation Services screen,
InterScan Gateway Security Appliance first checks the IP address of Sam's SMTP
server against the Standard Reputation database. If the SMTP server IP address is not
in the Standard Reputation database, InterScan Gateway Security Appliance then
queries the Dynamic Reputation database. If the SMTP server IP address is not in the
Dynamic Reputation database, InterScan Gateway Security Appliance forwards the
email to John's SMTP server. If the Dynamic Reputation database does have Sam's
SMTP IP address listed, InterScan Gateway Security Appliance takes the defined
action.