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How to Configure Exchange and Windows Server POP3 Service to Coexist Using Different SMTP Mail Domains

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This topic explains how to configure Exchange Server and the Windows Server POP3 service to coexist by using different SMTP mail domains.

Before You Begin

Before you perform the procedure in this topic, consider the following points:

  • In this scenario, Exchange Server users use the SMTP mail domain, exchange.northwindtraders.com, and the POP3 user use the SMTP mail domain, pop.contoso.com. In this scenario, Exchange Server accepts e-mail for Exchange Server users with the address of exchange.northwindtraders.com, and it also accepts e-mail for POP3 users with a different address, pop.contoso.com.

  • Before you perform the procedure in this topic, it is important that you first read Scenarios for Coexistence of the POP3 Service in Exchange Server 2003 and Windows Server 2003.

  • To successfully complete the procedures that are referred to in this topic, confirm the following conditions exist:

    • You are running Exchange Server 2003.

    • You are running Windows Server 2003.

Procedure

To configure Exchange Server and Windows Server POP3 service to coexist by using different SMTP mail domains

  1. Set up your infrastructure. For detailed steps, see How to Set up Your Infrastructure for Coexistence of Exchange and Windows Server POP3 Service.

  2. Mail-enable each POP3 user in Active Directory directory service and assign an external address for the mail domain that is used by the server running the Windows Server POP3 service. In this example, the external address is pop.contoso.com. For detailed steps, see How to Mail-Enable a POP3 User Account for the coexistence of Exchange and Windows Server POP3 Service While Sharing an SMTP domain.

  3. (Optional) Configure your POP3 clients to use your Exchange Server as an SMTP server. For detailed steps, see How to Configure a POP3 Client Computer to Use Exchange as the SMTP Server.

  4. Configure your POP3 clients to use authentication on their outgoing mail server, which is the SMTP server. For detailed steps, see How to Configure Authentication on a POP3 Client Computer's Outgoing Mail Server.

  5. Create an SMTP connector to route mail to the server running the Windows Server POP3 service. For detailed steps, see How to Create an SMTP Connector on Exchange to Route Mail to the Server Running Windows Server POP3 Service when using Different SMTP Mail Domains.

  6. On the server running the POP3 service, create a remote domain for SMTP mail domain that Exchange Server users. For detailed steps, see How to Create a Remote Domain for the Exchange SMTP Mail Domain on the Server Running the Windows Server POP3 Service.

  7. Configure the SMTP service on the server running the Windows Server POP3 service to use Exchange Server as a smart host. For detailed steps, see How to Configure Exchange as a Smart Host in the SMTP Service when using Different SMTP Mail Domains.

  8. Configure the SMTP service on the server running the Windows Server POP3 service with permissions to relay. For detailed steps, How to Configure the SMTP Service on the Server that is Running the Windows Server POP3 Service with Permission to Relay Through Exchange.