public folders, ACLs

[Stefan G. Weichinger]

I now solved most of my problems here and have a test setup that does 
what it should do.

We only hit the issue that deleting a folder from the public namespace 
fails because of this issue:

https://dovecot.org/list/dovecot/2011-May/059315.html

That is 10 years old ... is there a valid solution maybe?

(yes, I will try to find something as well)

We currently use a global ACL file and have 3 users in with full 
"lrwstipekxa" permissions.

Toggling off thunderbird's use of Trash isn't really wanted ...