[Dovecot] Error: Threading lost Message ID?

[Timo Sirainen]

On Fri, 2013-08-09 at 15:45 +0200, Ralf Hildebrandt wrote:
> QUERY:    THREAD REFERENCES ISO-8859-1 ALL
> RESPONSE: [SERVERBUG] Internal error occurred. Refer to server log for more information. [2013-08-09 15:42:34]
> 
> Aug  9 15:41:48 postamt dovecot: imap(username) tTbs7oPjfACNKs4m: Error: Threading lost Message ID
> Aug  9 15:42:34 postamt dovecot: imap(username) tTbs7oPjfACNKs4m: Error: Threading lost Message ID
> 
> What does that mean? WHY has the Message-Id been lost? How can I find
> out WHICH MAIL caused this?

Can you reproduce it? I'm guessing dovecot.index.thread file was
corrupted and caused this. It should probably rebuild the thread if this
error happens.

Or if you can reproduce this without dovecot.index.thread then it's
definitely a bug and I'd like to get some headers to reproduce it:

doveadm fetch -u user at domain 'hdr.message-id hdr.in-reply-to hdr.references' mailbox INBOX

Anyway, improved the error message: http://hg.dovecot.org/dovecot-2.2/rev/5de1e4fdb758