Hi, There is a plugin "mail_log" that you can use to audit what users/user agents are doing, probably mail_log_events flag_change is helpful?

--
peter

Am 2016-12-06 um 10:24 schrieb plataleas:
Hi Steffen

Thanks for the reply!

- Users are accessing from multiple devices simultaneously
- Each user has his own mailbox, we do not use shared mailboxes

regards



On 12/06/2016 10:14 AM, Steffen Kaiser wrote:
On Tue, 6 Dec 2016, plataleas wrote:

We experience some unexpected behavior with dovecot. It happens that
emails marked as read get marked as unread (MUA is Thunderbird on port
143). Unfortunately this happens randomly, reproducing this issue is
difficult. We could not find any pattern, it happens rarely.

does your user(s) access these mailboxes from two or more clients
simultaneously - either from the same account or as shared mailboxes?

-- Steffen Kaiser

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