Tools > E-Mail Accounts > Add a new e-mail account (if this is a new account) or View or change existing e-mail accounts (if you need to modify an existing account)

If you're editing an existing account, highlight the account you'd like to edit, then click Change.
If this is a new account, choose the correct type (typically POP3 or IMAP)...

Following is where you enter basic settings. Note that the Login Information > User Name should be in the format of user@domain.com.
Do not select "Log on using Secure Password Authentication (SPA)"

In order to enable SMTP
Authentication, select the "More Settings" button...

Select the "Outgoing Server" tab, then
check the "My outgoing server (SMTP) requires
authentication" box.
No other settings need to be changed on this page.

Outlook will now authenticate all
outgoing mail.
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