And the AU was probably smart enough to do the research and find out that it would cost a whole lot more to purchase, build out, and maintain their own mail inf

And the AU was probably smart enough to do the research and find out that it would cost a whole lot more to purchase, build out, and maintain their own mail infrastructure. I've spent enough time in the hands of the NSW Department of Education to be able to tell you that any time they make the correct decision it's purely by accident.