I'm interested in this too. The setup I'm running at the moment isn't optimal, and I've got a client that would like to have all of their email archived for com

I'm interested in this too. The setup I'm running at the moment isn't optimal, and I've got a client that would like to have all of their email archived for compliance / contractual purposes, but can't use Postini or other third parties. I've been playing with the idea of setting up a back-to-back email server rig, which should do the trick, but it's really inelegant.