1. Open Outlook Express 6.
2. From the "Tools" menu, select "Accounts".
3. Select the "Mail" tab.

4. Select your E-mail Account.
5. Click the "Properties" button.
6. Select the "Servers" tab.
7. Under "Outgoing Mail Server", select the checkbox for "My server requires authentication".

8. Click the "OK" button to save any changes.