This article describes how to set up Simple Mail Transfer Protocol (SMTP) domains for inbound and relay e-mail in Exchange 2000 Server and Exchange Server 2003.

Back to the top

There are three classes of Internet SMTP domains that you may want to accept messages for:

•	Domains that are local to your Exchange 2000 Server and Exchange Server 2003 organization.
•	Domains that are not local to your Exchange 2000 Server and Exchange Server 2003 organization.
•	Domains that are shared between your Exchange 2000 Server and Exchange Server 2003 organization and another SMTP server (Shared Domain).

Back to the top

Domains That Are Local to Your Exchange 2000 Server and Exchange Server 2003 Organization

If you want to accept e-mail for the domain microsoft.com (for example), create a recipient policy that includes SMTP:@microsoft.com as one of the addresses. You do not need to actually set the filter on the recipient policy to put this proxy on any addresses. However, you have to click to select the check box for the SMTP domain, and you also have to make sure that the check box for "This Exchange Organization is responsible for all mail delivery to this address" is selected.

However, the easiest way to apply these addresses to your users is to use the recipient policy to do so. You can also set the filter so that only certain users get this proxy. In short, all of your Exchange 2000 Server and Exchange Server 2003 computers accept e-mail for all domains listed in all recipient policies.

Back to the top

Domains That Are Not Local to Your Exchange 2000 Server and Exchange Server 2003 Organization

If you use Exchange 2000 Server and Exchange Server 2003 on the Internet to accept e-mail for your main e-mail domain, you may want your Exchange 2000 Server and Exchange Server 2003 computers to also accept e-mail for another company (a company that your company just acquired, for example).

If you use the local e-mail domain microsoft.com and the non-local domain littlemicrosoft.com (for example), to set up this type of routing in Exchange Server 5.5, you use the Routing tab in the Internet Mail Service properties. In Exchange 2000 Server and Exchange Server 2003, you create an SMTP connector to littlemicrosoft.com, and then click to select the allow messages to be relayed to this domain check box on the Address Space tab in the connector properties. The source bridgehead servers that you specify on the SMTP connector are the bridgehead servers that accept e-mail for this domain.

If you want another server to be the real bridgehead, create a "dummy" connector with a higher cost that is sourced on your inbound servers, and have the real path set at a lower cost.

Back to the top

Domains That Are Shared Between Your Exchange 2000 Server and Exchange Server 2003 Organization and Another SMTP Server

If you would like for Exchange 2000 to receive e-mail for the domain microsoft.com (for example), check the local Exchange directory for a match, and then relay any unresolved recipients to another SMTP server or system, then follow the steps in the above section for relay domain. That is, setup a SMTP connector exactly as you would for a domain that you would like to relay for. Then, when you add the domain to your recipient policies so that your users can get the address, be sure to leave the check box for "This Exchange Organization is responsible for all mail delivery to this address" clear.

For more information about how to share SMTP domains with another mail system, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how to create a new recipient policy, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how to receive a messages for two SMTP domains using Exchange 2000, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how to set up SMTP domains for inbound and relay, click the following article number to view the article in the Microsoft Knowledge Base:

Back to the top