1. Open Outlook.


2. On the Tools menu, click Account Settings.


3. Select the email account from the list and click Change.


4. On the Change E-mail Settings window, click More Settings.


5. Click the Outgoing Server tab and check the My outgoing server (SMTP) requires authentication option.


6. Click the Advanced tab and change the Outgoing server (SMTP) port.


7. If you want to use SSL, then change the port to 465 and select SSL from the encryption drop-down menu.


8. If you don’t want to use SSL, then change the port to 25 or 587.



Outlook SMTP authentication