There’s no documentation that I can find for Mail-in-a-Box that defines this, but numerous folks have said that simply moving an email to the “Spam” folder should have SA auto-learn it as spam. And possibly moving it from Spam to Inbox does the opposite (learns it as good/ham?)
But I want to know is that really true? I’ve sent so many emails to the spam folder, it doesn’t seem to ever improve. I’ll get the same spammy “check out my videos” messages right to my inbox.