Setting Postfix up as a smarthost's pretty straightforward. I've done it in reverse as an inbound mail gateway instead of using an MS Exchange Edge Transport role. I'm guessing you'd be allowing access based on IP?

While you want to keep it simple, I can't stress strongly enough to use at least outbound spam filtering. That way, in case you do somehow start churning out spam, it'll get caught before your IP gets blacklisted.

Solydx is another Xfce distro too.

Having a MediaWiki walkthrough lab project would probably be a good idea.

@ajstringham said:

Would they look a little and feel a lot different on a touchscreen device? Yes. But for initial stages that would be awesome.

What benefit do you see to Android on a non-handheld device? It's a handheld focused OS. It's purpose is mobility. Putting it on a desktop just seems like a horrible desktop experience. What's the draw?