BluRonin: I've done it before, using http://sourceforge.net/projects/eticket
You could download the source and find out how they've done it.
I've copied in below a support email i received from DH support (thanks Daniel) which explains the process..........
Create your .procmailrc file in your home directory. A basic example that
works on DH servers looks like this:
# Empty DH compatible .procmailrc file
# Last updated 7/25/2007
LOGFILE=/dev/null # specify something else if you want log files
# Add your rules here
# Catch-all rule for all unmatched email
And change the file named .forward.postfix to this (the quotes are
web design, development & seo by DigitalVibe