Microsoft KB Archive/174351

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XFOR: How to Configure Exchange with Secondary SMTP Addresses

Article ID: 174351

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 4.0 Standard Edition
  • Microsoft Exchange Server 5.0 Standard Edition
  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q174351


This article outlines the steps to create a secondary SMTP address space so Exchange Server mailboxes can receive mail addressed to multiple domains. Outside users can send mail to more than the default domain. For example, the same Exchange Server mailbox can receive mail addressed as and as


Before proceeding with the Exchange Server configuration, add a new MX record to reflect the additional domain name. This new MX record should be added in the Domain Name Service (DNS) provider, which might be part of the Internet Service Provider (ISP).

For additional information and the syntax of the MX record, please see the following article in the Microsoft Knowledge Base:

153001 : XFOR: DNS MX Records and CNAMEs

The correct addition of this MX record can be verified by performing a Name Service Lookup, using the new domain name.

To configure the Exchange Server computer, complete the following steps.

NOTE: If you are configuring an Exchange Server 4.0 computer, skip step 1 and continue to step 2.

  1. Open the properties for the Internet Mail Service from the Exchange Server Administrator program. On the Routing tab, if the Internet Mail Service is configured to reroute SMTP, click Add, enter the secondary Domain, and specify as Incoming.

    For example, if your domain name is and you wish to add a second domain name of, you need to click the Reroute SMTP mail (required for POP3 support) radio button on the Routing tab. These two entries will then be in the routing table: <Inbound> <Inbound>

  2. Add the secondary SMTP address space for all users on the list. This can be done individually by going to the properties of each mailbox. In the Exchange Server Administrator program under Organization\Site\Recipients, select a mailbox and double-click to open the Properties page. Click the Email Address tab, click New, select Internet Address, and then click OK. Enter the as the e-mail address. For additional information about bulk modifications, please see the following article in the Microsoft Knowledge Base:

    155594 : XADM: Generic Import Format to Add SMTP Secondary Proxy Address

  3. Restart the Internet Mail Service by double-clicking the Services icon in Control Panel.

Additional query words: smtp ims imc secondary exfaqcon

Keywords: kbhowto KB174351