Ask HN: Real Time Mail Traffic Overview

Setting up my mail system at the moment, and the easiest way I figure to stay on top of mail problems (spam attacks etc) is to actively be able to see what is happening as it happens.

There are plenty of log analysis tools for Postfix, but not many are still in production. Does any one know of a tool which allows you to view, in real-time, mail being processed?

Mail going through the server, current queue levels, sender address and recipient address. Drill down to daily totals for each address too.