I've been trying for a while to figure out how to get my tbird filters
to mark posts that are cross posted. I finally got it to work! I'm not
sure why it wouldn't just work when I set up the filter, but I had to
right click on the newsgroup name, select the newsgroup(folder)
properties, click the Repair Folder button, and re-download the group
posts, and ONLY then did the filter I set up work.
So, now any post that is cross posted is tagged "Crosspost" in light
grey and is marked "read".
Anyway, thought I'd mention that it seems Tbird has a bug that won't
necessarily respond to this particular filter unless the groups folder