I have installed imap-2006b a couple of weeks ago, and converted all my mailboxes from MBX to MIX about a week ago.

Starting a few days ago, I get an error message "Backwards-running mix index 1027283 < 1027292" whenever I click on a certain message in one particular mailbox (received on that day), in Thunderbird. The message seems to open okay, though, and I'm fairly sure I'm not missing any other messages.

This error is consistent - it appears every time I start Thunderbird, open the folder, and click on the message.

In addition, when clicking on any message in the mailbox, Thunderbird gives a message "IDLEfailed" (sic), which appears to mean that it unexpectedly lost the IDLE connection.

Surprisingly, "mailutil copy" doesn't give any error messages, and produces a mailbox that works just fine in Thunderbird...

When I delete and expunge all messages from the original folder, apart from the offending one plus the next one, the problem still occurs. Note that the messages don't appear to be "burped" - the message data files still contain all the original messages, but the index file only contains two lines. When I also delete and expunge that "next one", only leaving the offending message, the problem goes away, and the mailbox is "burped" as well.

The mailbox is filled only using dmail, using a procmail recipe. The dmail in question is definitely the 2006b one.

imap2006b mas compiled OOTB, with "make lrh".  I have an /etc/c-client.cf:

        I accept the risk for IMAP toolkit 4.1.
        set hide-dot-files 1
        set new-folder-format mix
        set empty-folder-format mix

Mark, I will followup to you with (links to) the mail folders, and the Thunderbird IMAP log (since they contain identifiable information that I'd rather not share in public).

Best regards,

 - Michael
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