Internal Email Server for Non-Internet Facing Network

I have an internal network with no internet connection that needs an email server to allow us to leverage status reporting features for a handful of applications. I was wondering if MiaB can be used on such a network and if so what is the process for downloading all of the installation files for offline use (I have to sneakernet the files from home).

Seems like overkill. You don’t need MIAB. Plain old standard postfix would do the trick.