as by message, Mail app does not bother moving mail correctly marked as spam in the spam folder -- this only happen when I am at home, and only during the week-end. I suspect that the IMAP server is to be blamed. I could try to delete the account and recreate it, but since it's my work email, and the server is showing some problems, I am quite lukewarm about this solution (Mail app problem in Lion). Is there another less drastic way of solving the problem?
I'm on OS 10.8.3 all latest whistles and bells.