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Testing Marking Cross-posts as read in SeaMonkey

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 groups.

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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