Am 02.08.21 um 19:59 schrieb Stefan G. Weichinger:
>> ... "Error: Can't open mailbox Oeffentlich: Mailbox
doesn't exist:
>> Oeffentlich"
Additional info from the conf:
namespace {
	type = private
	separator = /
	prefix 
#location defaults to mail_location.
	inbox = yes
}
namespace {
	type = public
	separator = /
	prefix = Oeffentlich/
	location = maildir:/home/vmail/oeffentlich
	subscriptions = yes
}
That "subscriptions = yes" is different from the example at
https://doc.dovecot.org/configuration_manual/shared_mailboxes/public_shared/#public-shared-mailboxes
(last block).