Description of problem:
When recieving bugzilla mail, I'd like to sort the mails belonging to
one bug into a single thread.
This is currently not possible since the mails sent out from bugzilla
seem to have a random message-id, although the "In-Reply-To" header has
the same value for every mail belonging to a bug: "bugzilla-xxxx",
with xxxx being the bug number.

My proposal is to generate unique message id for each bug that is
created, save it, and to send out each follow-up mail to a bug with
"In-Reply-To" set to this message id, thus allowing a capable mail
reader to thread all anwers under the original bug.

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