You can set up procmail to auto-run a program when you add/remove messages on IMAP folders. I use it to auto-train my crm114 spam catcher (by dragging emails m

You can set up procmail to auto-run a program when you add/remove messages on IMAP folders. I use it to auto-train my crm114 spam catcher (by dragging emails mostly from "Maybe Spam" to "Absolutely Spam" but it works the other way too: when you drag an email from Maybe Spam to Inbox, it trains that message as Not Spam).