As promised, i updated the Mollom component based on recent recommendations from Dries Buytaert. Anyone that use this component, please upload the updated version. It will change nothing in your work process (except: if you do not pass the IP when checking the content, please do so) so it will be an easy change.
And now on testing results. After doing the updates, i've run that exact 747 spam records through the changed process and here are the results:
Mollom:
  • ham - 5
  • spam - 271
  • unsure - 471

As you may see no more "no answer" there and the number of spam went to 271 from 24, while ham from 49 went to 5. But it still show 471 as unsure. I've been told by Dries taht that's a weirdly high amount of unsure records, but... that's what i have got.