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Beginning with Exchange 2000, an add-in is no
longer necessary to support SMTP, so you don’t always need to
configure a connector.

However, there are times when a connector may
be required when using a newer version of Exchange. For example,
you may need to forward mail for a particular domain to a smart
host at a defined IP address, rather than relying on DNS for mail
delivery.

To configure an SMTP connector in Exchange 2000
or Exchange 2003 to forward mail to a smart host, follow these
steps:

  1. In the Exchange System Manager, expand the
    Administrative Groups container.
  2. Expand the desired administrative group, and
    expand the Routing Groups container.
  3. Expand the routing group you need to work
    with, right-click the Connectors folder, and select New.
  4. Select SMTP Connector.
  5. On the General tab, enter a name to identify
    the connector.
  6. Select Forward All Mail Through This
    Connector To The Following Smart Hosts, and enter the IP address of
    the other site’s mail server, enclosed in brackets (e.g.,
    [172.25.3.110]).
  7. Under Local Bridgeheads, click Add, and
    select the SMTP server that will become the SMTP bridgehead for its
    routing group.
  8. On the Address Space tab, click Add, select
    SMTP, and click OK.
  9. In the E-Mail Domain box, add the name of the
    remote location’s e-mail domain (e.g., domain.com), and click
    OK.
  10. On the Advanced tab, select
    Outbound Security, and select the proper
    authentication method for your relay host. Anonymous Access is the
    default.
  11. Click OK three times to exit the SMTP
    connector configuration.
  12. Restart the Microsoft Exchange Routing Engine
    service and the SMTP service.