This seems to be connected to Australian Post saying for the past few months now that they can not deliver a package (I haven't ordered anything in some time and have no troubles when I do). When I drop the link they provide into the search engine I get a page that look like Aussie Post but I took the tracking number and when to the real site and dropped it in to search. Aussie post said not a real number try checking again. So I have blocked them and will report the senders. Be careful especially if you haven't ordered anything. Also been hit with msg that I have won big money to claim it due to having being held in customs they need me to contact. Of cause we all know this is a scam also. Hope this helps don't get caught.