My pal Susan turned me on to Death2Spam, a cool new spam-filtering service.  Basic pest-control services are free, or you can get a premium account for $35/year.  There’s nothing to install and the filtering kicks!!! It uses a real-time collaborative spam blacklist, so you’re helping your neighbor by using it.  Best part: you can set it to pass along just the headers for anything it recognizes as spam.  The message itself gets replaced with one sentence: Death to Spam!  I love it.  :-)