F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Deployment Manual - page 65
CHAPTER 4
63
Configuring F-Secure Spam Control
4.2
Realtime Blackhole List Configuration
This section describes how to enable and disable Realtime Blackhole
Lists, how to optimize F-Secure Spam Control performance, and how to
specify blocked and safe recipients and senders by using black- and
whitelisting.
4.2.1
Configuring Realtime Blackhole Lists
The product supports DNS Blackhole List (DNSBL), also known as
Realtime Blackhole List (RBL), functionality in spam filtering. The
functionality is enabled by default.
To test DNSBL/RBL:
1. Make sure you have a working DNS server configured in Windows
Server networking. The primary DNS server should be configured to
allow recursive DNS queries. DNS protocol is used to make the
DNSBL/RBL queries.
2.
Make sure you do not have a firewall preventing DNS access from
the host where F-Secure Spam Control is running.
3.
Test the DNS functionality by running the nslookup command at
Microsoft Windows command prompt on the host running F-Secure
Spam Control.
An example:
C:\>nslookup 2.0.0.127.sbl-xbl.spamhaus.org.
Server: here> Address: appear here> Non-authoritative answer: Name: 2.0.0.127.sbl-xbl.spamhaus.org Addresses: 127.0.0.2, 127.0.0.4, 127.0.0.6 4. If the test is successful, continue with these instructions. If the test is not successful, you should double-check your DNS and firewall configuration.