[Dovecot] help with global ACL

Dear All, I am willing to know can i restrict all my users to delete some general folders like Drafts, Sent, SPAM, Trash etc. I am using autocreate plugin to create these folders and using Maildir to store my mails. I also want that they can not unsubscribe the above mentioned folder as well.

Dovecot version - 1.2.11

Please send me some link so that i can implement the same if possible.

Thanks

Piyush Joshi