Just wanted to point you to a short post I just published on my consulting site:
Simple Docker Postfix container
It provides a very basic Postfix setup that's ready for handling multiple domains and forwarding.
...In the past I've written about my "home cloud" that used to be OpenVz containers, and how I've come to advocate rebuilding the "build server" for every build
Docker has quickly become one of my favorite enabling tools for this overall philosophy of creating repeatable builds that ...