Setting up SMTP Authentication for Microsoft Outlook XP (for Windows)

Step 1: Using the Tools menu in Outlook , select the "Email Accounts..." option.

This will open the Email Accounts window where the mail accounts are listed.

Step 2: Select the POP/SMTP account which you will be changing and then click the "Change..." button.

This will open the E-mail Accounts window where the POP and SMTP settings are entered.

Step 3: In the Email Accounts window, the POP account information will already be present so all you have to do is to click the "More Settings..." button.

This will open the Internet E-mail Settings window where the advanced SMTP settings are to be entered.

Step 4: Select the Outgoing Server tab in the Internet Email Settings window and then check the box next to "My Outgoing server (SMTP) requires authentication". Now enter your e-mail username and password in the given fields and then click on the "OK" button.

NOTE:  If you don't want to type in your password every time you send e-mail, it's probably a good idea to check the box next to "Remember Password" in Step 4 above.  After that, click on the "Next" button and then on the "Finish" button to finalize the changes.

You're Done!