Hi all >>> First, I would like to voice our general disgust (as well as that of >>> our customers) with the recent changes to the Email Defense product. >>> Also, I have noticed a gradual decrease in performance ever since we >>> started using the service (when it was first released). While it is >>> still effective, it's not nearly that of the service we initially >>> started with. >>> >> I'm not sure if it's us, or just the nature of spam. I have other >> filters on another address I use and it's squeaking through more often >> that not. (sorry I don't have a better answer, we're looking into this >> though) > > I agree that the spam filter has been far less effective than it was when I > started with the product. In attempting to have a customer upgrade service, > I plotted the spam/ham ratios of their old, non-updating spam filter to our > system. Their old system was flagging about 20% of their emails as spam and > was steadily dropping off over the six months of data I was using. Our spam > filter flagged a far higher number, but I was extremely disappointed to find > a steady and definite decline in effectiveness plotted over time. > (Comparisons using a 7 day rolling average)
We don't use Email Defense. But we have our own spam filter and I also use that of Google and another commercial one and unfortunately all of them had a decline in effectiveness over the last year or so. Our own spam filter now uses *much* more resources than before only to achieve an acceptable but not really good result. What surprises me a bit is that Google isn't any more effective than the others despite the huge user feedback they can collect. Another problem we see is that effectiveness varies extremely between different domains and users. So some of your customers are probably very happy and others not at all. I find it rather difficult to measure the overall effectiveness of a spam filter because you've got to look at averages and at least also at mean deviations over mail accounts and domains. What a world of pain... Just to give another data point: We see a spam/ham ratio of approximately 10 which makes even a few percent of missed spam a real problem. This probably wasn't very helpful to you guys, but as I'm looking into different solutions now and then I thought to share my experience. Good luck to you all. Arthur -- "Feel free" - 10 GB Mailbox, 100 FreeSMS/Monat ... Jetzt GMX TopMail testen: www.gmx.net/de/go/mailfooter/topmail-out _______________________________________________ domains-gen mailing list [email protected] http://discuss.tucows.com/mailman/listinfo/domains-gen
