I've thought that something like the spamassassin model would be sufficient - calculate a 0.0 - 1.0 range of likelihood to block, and set cutoffs on the 0 end t

I've thought that something like the spamassassin model would be sufficient - calculate a 0.0 - 1.0 range of likelihood to block, and set cutoffs on the 0 end to auto approve, and toward the 1 end to auto block, and moderate the middle. Was good for spam for a long time.