It's a good suggestion, but of course I looked before deciding to write my own script. The problem with qmail, and other software by Daniel Bernstein, is that it relies so heavily on patches to do anything. So, mtrack/strack are built to work with core qmail logs, but we have 50+ patches to this qmail server and so the logs are completely different than the logs mtrack expects. I used mtrack/strack as a basis for my script, but had to heavily modify it to work in our environment.