On June 10, 2017 at 10:30 PM Tristan Miller <psychonaut@nothingisreal.com> wrote:
Greetings.
I use Dovecot 2.2.29.1 as my IMAP server. Owing to a bug in my mail client [1], several unique messages (mostly in my Sent folder) have duplicate Message-ID headers. Dovecot itself doesn't seem to be bothered by this, though my mail client is confused by the false duplicates. (It screws up the threading display, and results in data loss when I run the client's deduplication filter.)
I would like to change the Message-ID headers in the "duplicate" message files stored in my IMAP server so that they are unique. I realize that this has disadvantages of its own, but I can't think of a better alternative.
So this leads me to two questions:
- Will Dovecot get confused if I simply open the message files in a text editor and manually change their Message-ID headers? If so, how should I go about changing the Message-ID headers?
Expunge the mails, then edit message-id's and import them back.
- Does there exist any tool that will scan a maildir folder to find messages with duplicate Message-IDs, and automatically rewrite the Message-ID headers so that they are (probably) unique? I could probably kludge together a quick shell script, but if someone's already gone to the trouble of writing such a tool and making it relatively robust, I'd rather use that instead.
https://wiki2.dovecot.org/Tools/Doveadm/Deduplicate should let you expunge duplicate messages.
Regards, Tristan
[1] http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3828
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Tristan MillerFree Software developer, ferret herder, logologist https://logological.org/