Unison (newsreader) Question


In OSX 10.4.2 I'm using Unison 1.6.2. It doesn't seem to be able to filter out crossposted messages. I keep on seeing the same messages that have been posted to multiple groups. Is there a setting that I should have acitivated? I have View Read Messages turned off so once a message has been read in one newsgroup it shouldn't come up in another, right?