Emmanuel Blot wrote: > Well, Trac does not send this header AFAICT, so this needs to be > implemented as well. > I'm not sure GMail uses this anyway. Need to check.
It does. http://trac.edgewall.org/browser/trunk/trac/ticket/notification.py#L284. I would certainly hope GMail prioritizes IRT over the subject for threading, but that may not be the case. --Noah
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