When trying to send email from SAM you get the message
"Recipient address rejected: Message rejected due to: SPF fail - not authorized."
The receiving email server is checking if that domain (sam.org.au) can send emails on your behalf.
Contact your IT and tell them that they need to change your domain's SPF record so that it authorizes wp013.web24.net.au. For example, they could change the record to something like:
v=spf1 ip4:184.108.40.206 include:spf.protection.outlook.com a:wp013.web24.net.au -all
If your IT can't help you can contact CompNet on firstname.lastname@example.org.