After I installed Dspam some time ago I checked on it's accuracy and made a small graph to illustrate it. Since my Dspam installation at Octobre 7th 22 days and 1141 emails passed by. All in all I'm very happy with Dspam. It works just fine and the overall accuracy is 98.51%. I got a false positive rate of 0.79% and a false negative rate of 0.70%. Those emails which got detected wrong were usually emails from persons or companies I never had a correspondence with before. Emails from the same senders were detected correctly after training the filter with the wrong detected emails.