Each comment and TrackBack received by the system is scored through a number of tests provided by anti-spam plugins for desirability. Each non-abstaining test contributes a score on a scale from -10 to 10, from least to most desirable. These tests are averaged to create a Final Feedback Rating which, along with the individual test scores, can be viewed on the individual comment or TrackBack editing page for that item.

The Junk Score threshold is the minimum allowable score for non-junk feedback items. Any score lower than the Junk threshold will cause an item to be marked as junk.

This setting allows you to compensate for any plugins that regularly cause feedback items to be miscategorized as Junk or Not Junk. However, it is highly recommended that unless you have good reason to do so, you leave it set to the default of 0.