So whether you use a webmail or a Bayesian filter add-on with outlook express, the key to achieving the best efficiency from your filter is ensuring you use the 'delete as spam' function properly. This is not as easy as it sounds. People have a tendency simply to delete mail from their inbox that is not wanted, be it spam or otherwise. But by doing this you are actually marking the spam that has got through your filter as 'not-spam', which makes it easier for the same message to get through again.
Likewise, people have a tendency to spam legitimate mailings from mailing lists they no longer want to receive. In these cases they have opted in to a list, but no longer want to receive messages so begin spamming them.
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