I do a fair bit of reading of posts on UseNet which are often
cross-posted, but the cross-posts are not getting marked as read.
I know this did function, long ago, in Netscape Navigator, got broken
(was that in Mozilla Suite??) and still doesn't work in SeaMonkey and, I
guess, in Thunderbird.
So I'm cross-posting this to three groups on the news.mozilla.org server
so I can have a bit of a look ... and play!!
The way I figure, there must be information in the message headers which
is common to all the cross-posts but different to any other posts in any
of the mentioned groups.
If you're not interested, please killfile this thread in the three news
User agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101
SeaMonkey/2.49.1 Build identifier: 20171016030418
User agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
SeaMonkey/2.49.1 Build identifier: 20171015235623
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