I use Earthlink, and they have a Known Spam folder on the server that they sometimes put things in. It is not a folder I am allowed to put anything in, so I can’t use it as the generic junk folder for SpamSieve. But is there a modification I could make to the Rescue Good Messages look in there to pull out likely good messages?
The Apple Mail - Server Junk Mailbox script is more configurable and can do this sort of this.
That did it. I had the folder name wrong (case sensitive) on the first try, but that moved them to the main Junk folder as wanted.