kmail: Storage of messages in subfolders

[Rüdiger Härtel]

Hello,

I have several subfolders where kmail sorts incoming messages into and 
configured several filters (not sieve scripts) to a achieve this. The email is 
requested off an POP3 account and the local mail is stored in maildir format.

However if I look into the subfolders on my disk I do see the subfolder on the 
1st level. Subfolders and emails therin on the 2nd level are not stored on 
disk.

So my question: Where are those files?
Has this someting to do with akonadi?

Just to be more verbose:

  kmail             filesystem
==================================================
  inbox             $HOME/Mail/inbox          ok
  sent-mail         $HOME/Mail/sent-mail      ok
  outbox            $HOME/Mail/outbox         ok
  trash             $HOME/Mail/trash          ok
  templates         $HOME/Mail/templates      ok
  mailing-lists     $HOME/Mail/mailing-lists  ok
   + digikam        ???? where are the files ???
   + Fossil         ???? where are the files ???
   + kde-pim        ???? where are the files ???


I am using kde-neon 5.8.5 with kmail 5.4.


Regards

Rüdiger