Mozilla problem with threaded view?

[Steffan Jacobs]

Hi,

I don't really know a lot about this but I've been seeing the same thing 
and I'm wondering how exactly Mozilla determines these threads. Does it 
use the subject line or the "In-Reply-To: <message-identifier>" header 
(also). As far as I can see the latter could at least be causing some of 
the errors you've mentioned, in which case it's not really a bug but 
actually caused by user behaviour.

Regards,

Steffan Jacobs.