We have the same problem, with a twist. When Thunderbird deletes a folder, it is still shown by the GUI. Dovecot deleted the folder correctly, and the sunscriptions file is also correct. Some other times, on shared folders, Thunderbird refuses to delete; in this case, apple mail on iphone can delete successfully. This suggests that the problem is in Thunderbird's code. 

R 

On 5 Feb 2018, at 17:32, Aki Tuomi <aki.tuomi@dovecot.fi> wrote:

On February 5, 2018 at 6:16 PM Gabriel Kaufmann <mailings@typoworx.com> wrote:


Doesn't anyone have an idea?

It looks like Dovecot and/or Thunderbird simply "ignore" sub-folders of
IMAP-Folder in Trash/ as they are also not shown in Trash-Folder.
Sub-Folder for INBOX and other IMAP-Folders work perfect (using
layout=fs Mailbox).

Why doesn't this work for Trash?

Best regards

Gabriel Kaufmann

Can you try running this as root and provide output?

doveadm -Dv -o mail_debug=yes mailbox delete -u username Trash/Somefolder

Aki

I had the same with Mac Mail.app. I decided to rm -rf the sdbox file on the master and replica and I won.

It was persistant though and I think it had to do with the following:

I let my mail deliver in yearboxes, which have many many subfolders, some are just "placeholders". They appear different in the view.

Regular mailboxes are "dark" in colors, placeholder boxes are "white" in colors (see attachment), where winkels is the "placeholder" folder and "action" is the regular mailbox in which mail gets delivered.

I could not get rid of those "winkels" kind of folders". Only by force removing them from the filesystem hierarchie.

Hope this helps a bit :)

Cheers

Remko