limit sharing ability to certain users

Hello

Is it possible to limit the ability of sharing it’s own mailboxes to only a few users? We have a few sensitive mailboxes of users where the ability to share via IMAP SETACL should be prevented.

I tried the following so far… doveadm acl remove -u test@onnet.ch INBOX user=test@onnet.ch admin

but when doing this the admin rights are still there doveadm acl rights -u test@onnet.ch INBOX vmail@buserver:~$ doveadm acl rights -u test@onnet.ch INBOX Rights
lookup read write write-seen write-deleted insert post expunge create delete admin

Thanks in advance for your help Simeon