Q217217: XFOR: How to Control Routing of Subdomains in IMS Routing

Article: Q217217
Product(s): Microsoft Exchange
Version(s): 5.0,5.5
Operating System(s): 
Keyword(s): exc5 exc55
Last Modified: 21-DEC-2000

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The information in this article applies to:

- Microsoft Exchange Server, versions 5.0, 5.5 
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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 <inbound>. 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 <inbound>
  chicago.sample.microsoft.com <route to other host for this subdomain>

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:

  #sample.microsoft.com <inbound>
  dallas.sample.microsoft.com <inbound>
  chicago.sample.microsoft.com <route to other host for this subdomain>

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

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Keywords          : exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbZNotKeyword2
Version           : :5.0,5.5
Issue type        : kbinfo

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