Mails in the archive have a mailto: link with which you
can reply to the email you're viewing. That mailto: URL
contains an &In-Reply-To= part, to set the In-Reply-To:
header in the generated mail and thus enable correct
threading of replies.
Unfortunately, we give the wrong ID. We give the
In-Reply-To: header of the message to which the user
would be replying, but we should be using Message-Id:
of the message in question, instead.
(although the example given there no longer shows the
problem because I've fixed the bug and recreated the
archives since then)
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