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SMTP yourself, part 2

Part one explained how e-mail services reduce spam by restricting the ability to relay messages

(i.e., send outgoing mail) only to subscribers located on the service provider's network. You can

install the SMTP service on a Windows 2000 Professional computer to enable that computer to

function as an outgoing e-mail server for the local computer or even other computers on your local

network.

You configure settings for the SMTP service through the IIS console, which you'll find in the

Administrative Tools folder. Open the IIS console, right-click the Default SMTP virtual server, and

choose Properties.

First, limit message relay through the SMTP server, just like the ISPs do. That will prevent others

from using your SMTP server to send spam, which will get your server blacklisted shortly. That's

bad if your computer is behind a firewall that does Network Address Translation (NAT), because

the IP address of the firewall will be blocked, potentially preventing any outgoing mail from

leaving your network. To limit relay, follow these steps:

Open the Properties for the SMTP virtual server in the IIS console, click the Access tab, and then

click Relay.

Select Only The List Below, click Add, and add the IP address, subnet, or domain of other

computers that need to relay mail through the server.

For even better security, configure the SMTP server to require authentication.

Back on the Access tab, click Authentication.

Clear the Anonymous Access option and make sure Basic Authentication and/or Integrated

Windows Authentication is selected, depending on the authentication method(s) you want to use.

Click OK, close the Properties for the server, and then close the IIS console.

Now add a user account on the SMTP server for each user who needs to send e-mail through it, and

have users configure their e-mail clients to use authentication.

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