Microsoft KB Archive/307628

= XFOR: Routing to Multiple Domains with a Single SMTP Proxy Address =

Article ID: 307628

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q307628



SUMMARY
This article describes how to configure the Internet Mail Service in Exchange Server 5.5 to reroute Simple Mail Transfer Protocol (SMTP) messages for multiple e-mail domains by using a single SMTP proxy address.



MORE INFORMATION
The Exchange Server 5.5 Internet Mail Service can rewrite the SMTP headers of e-mail messages so that you can reroute an e-mail message that is sent to a recipient by using the e-mail address @ .com to another SMTP address  2@ 2.com without configuring this destination recipient with both SMTP proxy addresses. This article describes a method to accomplish this in which the mailbox in Exchange Server 5.5 only needs the primary SMTP address on the mailbox.

For additional information about how to configure the Internet Mail Service in Exchange Server 5.5 to route SMTP messages for multiple domains by adding secondary SMTP proxy addresses to each mailbox, click the article number below to view the article in the Microsoft Knowledge Base:

264557 XFOR: Configuring the Internet Mail Service to Route SMTP Messages for Multiple Domains

In Microsoft Exchange 2000 Server, the functionality to reroute SMTP messages for multiple e-mail domains by using a single SMTP proxy address (which this article describes) does not exist. In Exchange 2000, if you either use recipient policies or add one address at a time to the individual mailbox, you must still configure the user with all of the SMTP proxy addresses that you want the user to receive e-mail messages for.

In Exchange Server 5.5, users on your Exchange Server 5.5 computer might have multiple SMTP e-mail addresses on the Internet; these users have only a single SMTP e-mail address defined on Exchange Server, but these users need to receive all of the e-mail that is sent to the users' alternate SMTP addresses on this same Exchange Server 5.5 computer. You can configure the Internet Mail Service to route SMTP mail for these multiple e-mail domains to a single e-mail domain.

The mail exchange (MX) records for these other e-mail domains must first be set up to point to your server before you configure the Internet Mail Service.

To configure the Internet Mail Service on Exchange Server 5.5 to reroute e-mail messages for multiple e-mail domains to a single e-mail domain, use the configuration in the following example.

In this example, the Exchange Server organization is adatum.com, and the only SMTP e-mail address that is defined for a user in this organization is administrator@adatum.com. However, this user has other valid e-mail addresses on the Internet that are not defined in Exchange Server: administrator@cpandl.net, administrator@cpandl.org, and administrator@internal.adatum.com.

To reroute all of the messages that are sent to any of these e-mail addresses to the administrator@adatum.com address without defining additional SMTP addresses for the administrator on the administrator's mailbox, in the Internet Mail Service Configuration properties, click the Routing tab, and then configure rerouting as follows.

After you change the configuration, send a test message to administrator@cpandl.net. This message is rerouted to administrator@adatum.com. Send another test message for both administrator@cpandl.org and administrator@internal.adatum.com; the message is also rerouted to adminstrator@adatum.com.

NOTE: You can also use this configuration for communication between Exchange Server sites by means of the Internet Mail Service and between Exchange Server organizations by means of the Internet Mail Service.

A limitation of this procedure (and also of the procedure that is described in Microsoft Knowledge Base article Q264557) is that there can be only one reply address. When a user replies to a message that was sent to any of the users' e-mail addresses that are configured in the Internet Mail Service, if the address is not the primary SMTP address, the reply address is still be placed in the outgoing mail, not the secondary address that is configured in the Internet Mail Service.

The method that this article describes to reroute SMTP messages for multiple e-mail domains by using a single SMTP proxy address is quite different from routing mail messages on Exchange Server based on e-mail addresses. For additional information about routing mail messages on Exchange Server based on e-mail addresses in Exchange Server 5.5, click the article number below to view the article in the Microsoft Knowledge Base:

251124 XFOR: How to Configure Alias Table Functionality in Exchange Server

Additional query words: Alias Table SMTP IMS intersite

Keywords: kbinfo KB307628

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