User Guide

Managing the spam filtration server 43
Service rating means the service reliability from the viewpoint of filtration server
administrator. While checking a sender's IP address in DNSBL, Kaspersky Anti-
Spam sends a request to all services included in the list. As soon as the results
arrive, it sums up the ratings of services, which have recognized the specified IP
address as one used for dispatch of unsolicited mail.
If the sum of ratings of the triggered DNSBL services exceeds 100, the sender is
considered to be in a black list, and such message will be assigned the
blacklisted status irrespectively of the results of checks performed using other
methods. At certain detection levels, the application can also analyze situations
when the sum of ratings of the services, which have discovered the sender in
their black lists, is less than 100. In that case the information about sender's
presence in black lists is used as an additional sign and the message will be
recognized as spam if only there are more spam signs revealed by other analysis
methods.
You can perform the following operations with the list of DNSBL services:
• Add a new service.
• Change service rating.
• Delete a service.
Let us examine closely each of these operations:
• In order to add a new service to the list:
1. Specify the address of that service in the lower empty line of
the list marked with +.
2. Enter the rating of the service.
3. Save the result by clicking Apply.
• In order to change the rating of an existing DNSBL service:
1. Specify the new rating value in the Rate column of the
corresponding service.
2. Save the result by clicking Apply.
• In order to remove a service from list:
Click the
button to the right of the address line of that service.
You are advised to exercise caution while selecting the DNSBL
services to be used. Various services use different policies for
generation of such lists. Please examine carefully the policy of each
service before you start using it for mail filtration.