Microsoft KB Archive/217217

= XFOR: How to Control Routing of Subdomains in Internet Mail Service Routing =

Article ID: 217217

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q217217



SUMMARY
In the properties for the Internet Mail Service, there is an option to enable routing. For the Internet Mail Service to still properly receive mail for the local domain, that domain must be entered and marked as. The result is that all subdomains of the higher-level domain are also accepted as inbound. Although you can specify that some subdomains be handled differently, this approach can become problematic in the case of a large number of subdomains.



MORE INFORMATION
Assume a domain of sample.microsoft.com with subdomains of dallas.sample.microsoft.com, seattle.sample.microsoft.com, and chicago.sample.microsoft.com. In this organization, mail for chicago.sample.microsoft.com is handled by a separate host. In the Internet Mail Service, the following entries are present:

sample.microsoft.com

chicago.sample.microsoft.com 

This Internet Mail Service server accepts sample.microsoft.com and all its subdomains as inbound, redirecting mail for chicago.sample.microsoft.com to the other host. This scheme works well if there are few subdomains to be rerouted in this manner, but becomes unwieldy if there are many subdomains to be rerouted. In this instance, prepending "#" creates an explicit route that ignores subdomains. For sample.microsoft.com, the table looks like:


 * 1) sample.microsoft.com

dallas.sample.microsoft.com

chicago.sample.microsoft.com 

For this example, only two subdomains are accepted as inbound on this server: sample.microsoft.com and dallas.sample.microsoft.com. The chicago.sample.microsoft.com is rerouted to the other host, and seattle.sample.microsoft.com (and any other unlisted domain) is rerouted by whatever method is specified on the Connections tab for the Internet Mail Service.

NOTE: Subdomains of dallas.sample.microsoft.com (such as plano.dallas.sample.microsoft.com) are also accepted inbound implicitly; prepending with the "#" sign also forces this entry to be explicit if you want.

The example companies, organizations, products, people and events depicted herein are fictitious. No association with any real company, organization, product, person or event is intended or should be inferred.

Additional query words: IMS

Keywords: kbinfo KB217217

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