On 14 April 2019 00:54 Martin Müller via dovecot <dovecot@dovecot.org> wrote:

Hi!

About 4-6 MUA Thunderbird 60.6.1 are going to connect with dovecot 2.2.13/IMAP (debian 8) and are using the same user/password. This setup works for years flawless (updated clients and serversoftware).

Since a few weeks there is one major trouble:

I one of the client moves a mail from the inbox to a another IMAP-Folder, most of the moved mail are moved for the moment. But an unstable period later, the mails are moved back to the inbox. In rarely cases, the moved mail is copied (one in the inbox, one in the destinationfolder).

Now I have to check, if this a Thunderbird-Issue or is this a dovecot-issue. For that reason, I will activate the extended logging of dovecot.

I cant see such events in the logfiles. Which switch is to turn on to log all events?

Or do anyone know the reason for the annoying "copy/move-the-mail-back"-issue?

Thank you in advance for all inputs.

regards, martin

---
Aki Tuomi