IMAP & KMail/Akonadi: Unavailable folders

[Jörg Schaible]

Hi,

now after 2 decades using KMail, I am on the verge of giving up.

I am currently using KMail and Akonadi 24.08.1 and I face the problem, that 
not all folders from my IMAP account are available in KMail. Only when I 
delete the account in KMail and recreate it, all folders are available for 
some time, but latest after two days, a lot of them are no longer present.

Anything is there when I look into the folder structure for the server-side 
subscription, every single folder. However, opening the local subscriptions 
dialog, a lot of folders are missing, especially the deeper nested ones.

When I start akonadiconsole I can see in the browser tab the complete folder 
structure, but all folders that are no longer available in KMail's local 
subscription are grayed out for unknown reason. Comparing the folder 
properties for the proper and dysfunctional ones reveals nothing special, the 
properties for the grayed out folders seem all OK.

I have no idea, what causes the problem, nor how to solve it. The server uses 
Courier and I am using the MySQL backend with an external DB, but an attempt 
to switch to Sqlite with akonadi-db-migration runs simply into a segfault when 
the new DB is about to be initialized.

So, currently KMail is for me no longer usable after all those years (with a 
lot of downs and only a view ups) and this is really embarrassing. And again I 
am missing rock solid KMail 3...

Regards,
Jörg