Summary: Missing message-ids in Bugzilla messages
It appears that messages generated by the new Bugzilla only have a Message-ID
header if they are messages for new bugs, not for comments. This breaks at
least the "Raw text" links in the gcc-bugs list archives.
I don't think it matters much what the message-ids are as long as they are
unique, but Bugzilla should generate them rather than leaving this to some