Hello Carsten, ty, I am glad I can help a little ...
Kopano must have changed the directories in Summer last year. I ran into it, when I updated my productive system (that will get replaced with Debian 10 + 8.7.0) to a nightly of 8.6.81.xxx end of August 2018. Regards Martin
pEpkey.asc
Description: application/pgp-keys