Last time we talked about how to get a simple installation of Postfix up and running. Once your organization becomes relatively complex, you will find yourself wanting to do things with email that may not seem immediately important. The first and most important thing is, of course, that the mail flows and that you can send and receive. I'm willing to bet that the first enhancement that comes to mind for people is spam control, or unsolicited commercial email (UCE). But that, as they say, is just the beginning. On that note, I'm going to save the best for last -- or is it the worst?
Read the full thing here
Some very good tips to get you started....