The following is Tip #24 from "25 Exchange 2003 Tips in 25 minutes." This content is excerpted from Scott Schnoll's book, "Microsoft Exchange Server 2003 Distilled," brought to you by © (2004) Pearson Education, Inc. Publishing as Addison-Wesley Professional.
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If you specifically block or allow computers to access your Exchange SMTP virtual server, this tool is for you. The SMTP Internet Protocol Restriction and Accept/Deny List Configuration tool is a combination of a Visual Basic script (.VBS) file and a companion module (.DLL) file that enables you to programmatically manipulate SMTP virtual server connection control and relay control settings, including the Accept and Deny List settings. Despite their names, the script file (IPSEC.VBS) and the DLL file (EXIPSEC. DLL) are not related to the IPSec protocol. It's just a naming coincidence.
You can use the script to add, delete, list, or completely clear IP address restrictions set on an SMTP virtual server or on the Global Accept or Global Deny lists. EXIPSEC.DLL can be used against Exchange 2000, but Global Accept and Deny List manipulation is supported only on Exchange 2003 servers. For more information, including the available command-line switches for IPSEC.VBS, refer to the Read Me file that ships with this tool.
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About the author: Scott Schnoll, an Expert on SearchExchange.com, is an MCT, MCSA and a long-time Microsoft Most Valuable Professional (MVP).
In addition to writing "Microsoft Exchange Server 2003 Distilled," he is a co-author of the upcoming "Exchange 2003 Resource Kit from Microsoft Press" and lead author for "Exchange 2000 Server: The Complete Reference."
Scott has written numerous articles for Exchange & Outlook Magazine, and is a regular speaker at Microsoft conferences, including MEC and TechEd, as well as industry conferences such as Comdex and MCP TechMentor, where he covers topics such as Exchange, clustering, Internet Information Services and security.