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Many SMTP mail servers require authentication in order to help ensure that only valid users send emails using the SMTP server. In order to send emails through an SMTP server that requires authentication, you need to setup your email client accordingly. The following instructions should help you do this...

Outlook 2000

Go to Tools > Services (or Tools > Accounts).
Select your Email Account and press "Properties."
Go to the "Servers" tab, and check "My server requires authentication" under Outgoing Mail Server.
Press "Settings," select "Use same settings as my incoming mail server," then press "OK" three times to save the changes & return to Outlook.
A restart of your computer may be necessary.

Outlook 2002 / 2003

Go to Tools > E-Mail Accounts.
Select "View or change existing e-mail accounts" and press "Next."
Select your Email Account and press "Change."
Press "More Settings." Go to the "Outgoing Server" tab, and check "My outgoing server (SMTP) requires authentication."
Select "Use same settings as my incoming mail server" and press "OK."
Press "Next," then press "Finish" to confirm your changes and return to Outlook.
A restart of your computer may be necessary.

Outlook Express

Go to Tools > Accounts. Select the "Mail" tab.
Select your Email account and press "Properties."
Go to the "Servers" tab, and check "My server requires authentication" under Outgoing Mail Server.
Press "Settings," select "Use same settings as my incoming mail server," then press "OK" twice times to save the changes, then press "Close" to return to Outlook Express.
A restart of your computer may be necessary.