Create a rule in Mail with the criteria being "Message is junk mail" and the action set to run this script. Messages that Mail thinks are junk will then be bounced and left in place for you to screen them.
No, it's a build-it-yourself script. The other one was a download-and-run script. That was done in 2008 and I don't know why since they could have used the "bounce" feature in mail back then. I need something new that overcomes Mail 5 new shortcomings