Log level Warning Short message Shipping (Australia Post). Shipping address is not set Full message IP address 32.23.23.34 Customer Page URL https://www.connaitre.com.au/plugins/paymentpaypalexpresscheckout/submitbutton Referrer URL /cart Created on 4/4/2017 5:53:37 PM
I just realised this warning when if the ordering is done by a guest. So this warning does make sense. A guest would not have an address by the submit time.
Suggestion though: this warning could have something like this in a closing bracket (This is OK, for if the user is a guest/purchases). So no need to panic by the admins.
e.g A warning message like this: SHIPPING (AUSTRALIA POST). SHIPPING ADDRESS IS NOT SET (This is normal if the user is a guest/purchases).
i.e. PayPal Express - this is similar to using Estimate Shipping button, because it's on the cart page. I think even for a registered customer, that it can happen too. Register a new customer, add item to cart, click on Submit.