junk mail filters not working

Hi

I set up mail filters on my account some weeks ago when I started getting a lot of junk mail. I am on "exclusive", so everything that is not on my safe senders list should go straight into junk. However as of today this seems to have stopped working. I've deleted a whole load but there's currently another 3 just in so you check those if you wish. Very annoying as if these filters don't work I'm going to have to stop using this email account.