As corv mentioned in another comment, the goal of Mail-in-a-Box is a little different from iRedMail. I'm trying to build something closer to a one-click email appliance that eventually anyone might be able to use, rather than a setup for sysadmins. [I'm the guy behind the project.]
I'm curious why you didn't base this on Kolab [0]? It looks like you share a lot of common components [1], but they've already done the integration work and added additional features.
I'm trying to build a system that is simple and auditable. Mail-in-a-Box is also really a system configuration project and not a project to build a better UI. So the goals are very different.
For instance on auditing, from looking at Kolab's source code I have no idea what kind of security settings are used. In Mail-in-a-Box I try to make these sorts of things clear and highly commented in the setup script.
