Here's a step-by-step guide on how to setup the outgoing mail server settings for Outlook (in general).
Select ‘Info’ from the FILE Menu of Microsoft Outlook.
Select Account Settings then click on the dropdown button “Account Settings”
Select your mail account and click Change:
Enter your email address into the E-mail Address field
Change the Outgoing mail server (SMTP) setting to mail.spirit.net.au
IMPORTANT: Do not change your Incoming Mail Server settings.
Click on “More Settings”
Click on the 'Outgoing Server' tab.
Make sure that the setting 'My outgoing server (SMTP) requires authentication' is enabled, select Log on using, then enter your SMTP Username into User Name, and your SMTP Password into Password.
Make sure that Remember password is enabled and Require Secure Password Authentication disabled.
Click on the 'Advanced' tab.
Change your Outgoing server (SMTP)Port Number to 25.
Click OK. You are done!