This is a brief tutorial on how to setup SMTP Authentication in Outlook 2003. SMTP Authentication is the preferred method to use to prevent your server from being an open relay. If you are using Outlook 2007, be sure to see our previous tutorial on how to setup authentication in outlook 2007.

SMTP Authentication Tutorial

The tutorial has sound, so be sure to turn up those speakers. If you are concerned about security, be sure to check out Linux security services.


Open SMTP Relay

An open mail relay is an SMTP server configured so that it allows anyone on the Internet to send e-mail through it, not just the email destined for a domain hosted on that server or by email sent by an approved users. Open relays are commonly used by spammers and if you mis-configure your server, you may have an open relay. Using SMTP AUTH is one way to prevent un-authorized users from sending email through your system.

Open Relay Testing

If you think your server is an open relay, you can test it using a number of online tools. I like’s open relay test tool. If that does not work for you, check out . They have a great collection of email and anti-spam information.

More Tips?

Like this? Let me know what other email clients or tips you would like to see.

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