Recently my junk mail filter stopped blocking addresses that are in my blocked addresses list. Even when a message comes in and I tell it to block it, the message gets moved to junk mail folder and is in the blocked address list but the next time the message comes in it is not blocked.
I am also running Norton Suite but have spam turned off.
I have reviewed a similar question "Junk email filter on Outlook 2003 is not blocking email..." and it is the exact problem I'm having. There was no solution to the problem listed. I have reviewed all suggestions in that question and none fixed problem.