3 Oct
2025
3 Oct
'25
3:05 p.m.
On Fri, 3 Oct 2025 at 13:55, Oliver Welter via dovecot <dovecot@dovecot.org> wrote:
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.
Not sure if it is related to the upgrade, but we had a similar issue. In general, if Message-id is different, it means it is a different message, not the same message duplicated/copied. In our case, it was some antivirus plugin on client machine trying to move message into Junk/Spam folder, but changing it in the process, which caused it detected the moved message as a new one and a loop started. You can try to check your mailserver (SMTP) logs if you will find the different message ids there.
-- bye, Marki