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

 

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 different SMTP mail domains.

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 that is running Windows Server POP3 service when using different SMTP mail domains

  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.

  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, and then click OK. In this example, the name of the SMTP address space is pop.contoso.com. 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. Because Exchange Server 2003 must also receive messages for this domain, on the Address Space tab, click Allow messages to be relayed to these domains. This setting makes it possible for all SMTP virtual servers that are listed under Local Bridgeheads to accept messages for domain.

  8. Click OK.

  9. Repeat this procedure on each Exchange Server that acts an Internet gateway for incoming mail.