Resolved Question: Are there any free spam filters that work?

Is there an email/spam filter that will delete any email with Viagra ANYWHERE in it?
Norton and all of the other standard spam filters still let stuff through even though I’ve set up rules specifically stating not to let anything with Viagra or any similar spam word through. I know this wont stop ‘image’ spam, but it drives me nuts that when you set up filters to delete anything with certain keywords in and the stupid software still lets it through. I don’t care about ‘scoring’ or any other rubbish like that. I just want something that deletes ANY email that contains any of the keywords I state (Norton and Outlook rules do not do this).
That’s not really very helpful. Everyone in the world with an email address that gets spam should just get a new email address? Surely it can’t be that hard to write software that scans every email and deletes any that contain ANY keywords specified (eg viagra, nursing assistant degree, etc)?