Hi Nick,

the Double Post was "intenional" - I was not subscribed with this emailadress so the first mail went into "moderator approval" and I resent it after subscribing myself to the list....the mods were even faster so it was doubled :)

Oliver

On 03.10.25 22:58, Nick Tait via dovecot wrote:
    On 04/10/2025 00:49, Oliver Welter via dovecot wrote:

     Hi All,

     I have migrated my mailserver (from dovecot 2.2 on debian 10 to dovecot
     2.3 provided by the mailcow-dockerized project) by coping over the
     mailstorage directory "as is".

     There is now a single mailbox where I have an issue with duplicated mails
     - the "Sent" folder had approx 400 mails upon migration, it now has 4500
     mails with each mail duplicated several times. Below are the header lines
     of one message, besides the Message-Id the header is exactly the same on
     all copies.

     I tried "doveadm force-resync" on the mailbox and the mailbox was removed
     and recreated from scratch on the mail app but  we still get additional
     copies added  - anybody has an idea what is going on here and how to fix
     this?

     Oliver

    Hi Oliver.

    Just wanted to let you know that I received 2 copies of your email above.
    They had different dates and message IDs, and the multipart boundary IDs
    were different (which is probably due to the way mailman forwards the
    message) and a few other minor things (also related to mailman?) but the
    content was otherwise the same.

    In case it helps the dates and message IDs were:

  Message-ID: [1]<[email protected]>
  Date: Fri, 3 Oct 2025 13:21:30 +0200

    and

  Message-ID: [2]<[email protected]>
  Date: Fri, 3 Oct 2025 13:49:55 +0200

    It would be interesting to know what your mail logs show when you sent
    your email?

    Nick.

References

    Visible links
    1. mailto:[email protected]
    2. mailto:[email protected]

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