On Tue, May 22, 2018 at 10:40, Steffen Kaiser <skdove...@inf.h-brs.de> wrote:

> Thunderbird (or some versions anyway) will display any subscribed folder, 
> regardless if it exists or not.

> Dovecot fails to both delete or rename non-existant folders.

> Checkout the local file "subscriptions" in your mailbox storage. (Close any 
> mail client before).

More explicitly, there are three possible actions here:

- the postmaster edits a user's subscription file in the server :-((

- the user edits the same file using their own client software (Thunderbird 
fails on this) :-(

- Thunderbird is patched to automatically clear the subscription file from 
non-existent folders :-)

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