UPDATE: I have since learned that I needed to add an aliased email address to my list of addresses to watch. Since doing that, Postini is doing much, much better and I consider myself impressed now.
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I'm trying out FastMetric's Postini spam-catching service at work. So far... I'm not so impressed. Even with my settings cranked up to "agressive", I've gotten several false positives (mail that I actually wanted to receive getting intercepted by the service) while 80+ spams have merrily made their way to my inbox... or would have done, if not for the fabulous and free SpamBayes plugin for Outlook. SpamBayes "learns" what you consider spam, and learns it fast.
The trouble with it, of course, is it can only do its thing once the spam hits our network. If Postini actually worked properly, it would be great because our server would be totally spared. I imagine Postini is somewhat handicapped by the fact that users can't train it easily. It has to rely on a set of easily broken rules for how to recognize spam, and as we have all learned, spam mutates by the day.
Meanwhile, at home, my Mail.app seems to have totally lost the ability to recognize spam of any kind or learn from previous examples. I don't know what happened... I tried a couple of suggestions I found online, but no dice. Sigh...
