It doesn't do the "request-and-send-on" functionality that the parent has (kudos to the original poster, very clever) but if you're just looking for chopping up e-mails it's useful. I use it as the recipient of my cron monitoring jobs.
Tested with qmail, could probably easily be adapted to other MTAs. http://www.quickfire.org/smschop-0.01.tar.gz
Somebody ought to cross ball point pens with coat hangers so that the pens will multiply instead of disappear.