There's a Vagrantfile that you can just vagrant up:

https://github.com/mail-in-a-box/mailinabox/blob/master/Vagr...

I poked a bit and it appears that the setup script is interactive which complicates playing nicely with Docker somewhat. It installs nsd + postfix, rewrites config files in /etc and mucks with ufw. Could probably mimic some of this by mounting locally customized config files into the Docker container.

There was some effort towards it and I'm still running a dockerized version without any problms whatsoever, but the maintainer considered Docker too hard to setup in the end (e.g. https://github.com/mail-in-a-box/mailinabox/issues/16)

I would love this! Already have a Debian 8 server and (although I want to use this) don't feel like spinning up a new server for MiaB.

This would make me very happy