In the past I remember this kind thing happening with the old Courier IMAP.

Upgrading to Dovecot solved the issue.

Buit you probably are running Dovecot already?


On Thu, May 30, 2019 at 3:14 AM Jeff Koch <> wrote:
> Hi List:
> All of a sudden this morning everyone using one of our QMT7 mailservers has 
> started getting 6,7,8 copies of each email. This is with IMAP accounts. It 
> seems as if the mailserver is not registering or marking the emails that they 
> have already been downloaded. I checked and we don't have multiple copies on 
> the mailserver itself - just on the email clients that connect to it.
> Any ideas ? Everything was working fine until this morning.
> Regards, Jeff

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