looks like the confirnm page is here:
https://www.usautoparts.com.au/Store/Checkout/Payment/
edit that page to change the settings for sending the email.
Contact page is here:
http://www.usautoparts.com.au/Contact/
call back is here:
http://www.usautoparts.com.au/Contact/Call-Back/
on each of those pages should be a Universal Email server behavior, you will need to edit the UE server behavior to change the email settings.