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Exchange Server Cookbook
book

Exchange Server Cookbook

by Paul Robichaux, Missy Koslosky, Devin L. Ganger
June 2005
Intermediate to advanced content levelIntermediate to advanced
464 pages
13h 2m
English
O'Reilly Media, Inc.
Content preview from Exchange Server Cookbook

7.22. Using a DNS Block List on Exchange Server 2003

Problem

You wish to use a DNS-based block list (DNSBL) to help filter and reject incoming spam.

Solution

Using a graphical user interface

  1. Open the Exchange System Manager (Exchange System Manager.msc).

  2. Expand Global Settings, right-click Message Delivery, and select Properties. Click the Connection Filtering tab.

  3. Click Add. Fill in the display name of the DNSBL you are configuring and put the lookup zone in the DNS Suffix of Provider field.

  4. If you wish to use a custom error message, fill it in. The default is <IPAddress> has been blocked by <DNSBL Display Name>.

  5. If the DNSBL returns multiple result codes and you wish to configure which ones you will actually block on, click Return Status Code. Select the appropriate option (usually Match Filter Rule to Any of the Following Responses), fill in the corresponding mask or response codes, and click OK.

  6. Click OK to return the Connection Filter tab.

  7. If you have certain addresses that you want to be able to continue to receive email this DNSBL would otherwise block, click Exception. Click Add and fill in the exempted addresses. Click OK to close the exemption box.

  8. Click OK.

Discussion

DNSBL support is a new feature in Exchange Server 2003 that can have tremendous impact on reducing the amount of spam that enters your organization. There are literally hundreds of blocklists being run around the world; before using any of them, do some research to find out their purpose, listing criteria, delisting ...

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Publisher Resources

ISBN: 0596007175Errata Page