Windows 2000 Server’s SMTP service won’t turn your server
into a full-blown mail server, but it can be useful for relaying mail to other
servers. For example, you can use the SMTP service to route incoming mail to a
smart host running Exchange Server or another mail server application.
One of the ways you can prevent relay through the internal
SMTP server is to require authentication between the external server running
the SMTP service and the internal server. By requiring authentication at the
internal server, you help eliminate the possibility that unauthorized
users—including those inside your organization—will use the internal server for
relaying or spamming.
To secure a connection between servers, start by configuring
the SMTP service on the external server to use the appropriate authentication
method for outgoing connections. Follow these steps:
the IIS console, and connect to the external server.
the SMTP virtual server, and click the Properties button on the toolbar.
- On the
Delivery tab, click Outbound Security, and choose Windows Security
the username and password from the internal server that the system will
use to authenticate the connection, and click OK.
Advanced, and enter the fully qualified domain name (FQDN) of the internal
server in the Smart Host field. If you specify an IP address instead of an
FQDN, enclose the address in square brackets, such as [192.168.0.4].
the Attempt Direct Delivery Before Sending To Smart Host option, click OK,
and click OK to close the server’s properties.
the internal server to require authentication, and configure it for
Configuring the connection in this way doesn’t secure the
e-mail system by itself; it simply secures the connection to the internal
server and helps prevent unauthorized access to the internal server. You should
still take steps to secure the external server to prevent unauthorized relay.
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