How to Create an SMTP Connector on Exchange to Route Mail to the Server Running Windows Server POP3 Service when using a Single SMTP Mail Domain

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This topic explains how to create an SMTP connector on Exchange Server to route mail to the server running Windows Server POP3 service. This topic applies to configuring Exchange Server and Windows Server POP3 service to coexist by using a single SMTP mail domain.

Before You Begin

Before you perform the procedures in this topic, confirm the following conditions exist:

Procedure

To create an SMTP connector on Exchange Server to route mail to the server running Windows Server POP3 service

  1. Click Start, point to All Programs, point to Microsoft Exchange, and then click System Manager.

  2. In the console tree, right-click Connectors, point to New, and then click SMTP Connector.

  3. On the General tab, type an appropriate name, click the Forward all mail through this connector to the following smart hosts option, and then type the fully qualified domain name (FQDN) or, in square brackets ([ ]), type the IP address of the server to which e-mail for the shared SMTP address space is to be routed.

    Configuring a smart host on the SMTP connector

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  4. Click Add to configure your bridgehead servers, and then select your Exchange gateway servers that accept Internet mail for this domain.

  5. Click the Address Space tab, click Add, click SMTP, and then click OK.

  6. In E-mail domain, type the name of the SMTP address space of the POP3 users (for example, pop.northwindtraders.com), and then click OK. On the Address Space tab, the e-mail domain now displays.

    Creating an SMTP address space on the connector

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    Warning

    It is important to enter the specific SMTP mail domain. Do not type (asterisk) on the SMTP connector. Setting causes Exchange Server to accept mail for all external domains and then relay it externally. This configuration allows open relaying for anyone on the Internet and is extremely insecure.

  7. If you are accepting e-mail for your POP3 users using the POP3 domain of pop.northwindtraders.com, on the Address Space tab, click the Allow messages to be relayed to this domain check box. This step is not necessary if all incoming mail to your POP3 users has the e-mail address of northwindtraders.com.

  8. Click OK.

  9. Repeat steps 1 through 9 on each Exchange Server that accepts incoming Internet mail.