I just discovered Mailinabox, such amazing work.
I’m reasonably experienced with Azure and have an MSDN license so get free credit so decided to pop it up there.
I wrote a Powershell script that makes the MIAB server up for you with little effort required, so just making aware in case it’s of use.
I also did a companion blog piece with some instructions and specific stuff related to Azure and Namecheap and the script I wrote.
Hopefully it can be of use to someone else.