[Dovecot] duplicate message headers in Thunderbird with dovecot server

[Matt McClure]

I've been trying to diagnose some strange interaction between dovecot
and Mozilla Thunderbird.

If two clients are connected to a dovecot IMAP server, Mozilla-based
clients start showing multiple messages in the message list for each
message that arrives after the sessions were started.

There is really only one copy of the message in the mbox file on the
server.  However, its UID changes repeatedly during the session, and
Mozilla gets confused.  From looking at Thunderbird's log of the IMAP
conversation, it seems the message sequence number does not change, and
I'm guessing that other clients handle the situation better because of this.

Nevertheless, I found this in the IMAP RFC 3501, so my interpretation is
that there is a dovecot bug involved:

   The unique identifier of a message MUST NOT change during the
   session, and SHOULD NOT change between sessions.  Any change of
   unique identifiers between sessions MUST be detectable using the
   UIDVALIDITY mechanism discussed below.  Persistent unique identifiers
   are required for a client to resynchronize its state from a previous
   session with the server (e.g., disconnected or offline access
   clients); this is discussed further in [IMAP-DISC].

Has anyone else experienced this problem?  Is there a known solution?

I've been logging what I've found so far at
http://bugzilla.mozilla.org/show_bug.cgi?id=209561

-- 
Matt

    Funky like your grandpa's drawers
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