Regular commenters may have noticed that a disturbingly large percentage of their comments have been held as spam. This issue should now be resolved. For the information of other Akismet/MT users, the problem was that our spam filter assigned a score of +1 if one’s URL had been previously published, and likewise if one’s required e-mail address had been. With the introduction of Akismet, which we can heartily recommend, a problem developed.
Specifically, the spam filter averages the score across all tests, so a genuine comment might have the +6 from Akismet and +1 from each of the other tests. Hence, an average of +2.67 – unfortunately, the threshold value is +3. This would not have been so much of a problem, had it not been that the filter disregards negative tests before averaging. Therefore, commenters with no track record who passed Akismet would get the full +6 points as their final score, but regulars, although getting a total of +8, would be averaged to +2.67
I have now increased the score for previous publishing, and we haven’t yet had a false positive.