I'm at the very beginning of the instructions. I've enabled SPAM Assassin and Spam Box in my control panel. When I go to Squirrel Mail, I see lots of mailboxes, but only one of them has a /spam extension. It looks like Spam Box has only been enabled for one of the mailboxes (which happens to be mine... hmm.) I clicked to subscribe to this mailbox, and it moved into my folder list. But I'm wondering about how to filter the other mailboxes on my domain for spam.