My upstream e-mail provider (Tormail) has a horrendous false-positive rate. There is also no webmail address book thingy that can whitelist stuff. Almost all of my friends' mail goes into the junk folder - in fact, there might be a bug as I don't recall anything going into the regular inbox except e-mails to myself!
Thunderbird has its own spam filter. Can I tell it to automatically redirect mails going into the junk folder into the inbox, and then do it's own spam filtering?