Hi Aki! Thank you very much for replying. I must admin that I thought this way (in the config file) was available for the private namespace...! But, if I read well, this solution considers only one namespace with two example folders in it. What I had with dovecot 2.3 is a little different (I apologize if I was unclear). Try to be more precise. If I look at the Folders situation in Roundcube (or in any mail client), I see the standard folders (Sent, Drafts, Trash, Junk) and two Public Folders (let's say FOO and BAR) that are created in the config as two namespaces. In Roundcube, the users with "lrwstipekxa" rights can freely create and delete folders in FOO and BAR and in the folders they contains, the ones with "lrs" rights can see and set read flag, the others don't see them at all. In dovecot 2.4, with the dovecot-acl files I cannot reproduce the same situation: I can create the two namespaces, I see them in Roundcube but cannot create folders in FOO and BAR. The strange thingh is that, if I manually create a folder -let's say TEST- then I can create and delete folders in TEST and in its subfolder but still not in FOO and BAR. What I need to know is: there is a way to reproduce the 2.3 behavior also in 2.4 or the new dovecot changes no longer allow it?
As soon I have a little time, I will try your solution but it seems to take the dovecot-acl files solution in the dovecot config file, isn't it?
Anyway, thank you so much for support.
Lukas