Dovecot ignores existing mailboxes and creates its own

Hello,

I have Postfix with Maildir format. User's emails are being delivered into

$HOME/mail/inbox

Apart from ~/mail/inbox, there are the usual folders:

$HOME/mail/archive
$HOME/mail/drafts
$HOME/mail/inbox
$HOME/mail/trash

Now I have installed dovecot, and set

mail_location = maildir:~/mail:LAYOUT=fs

additionally, I have defined mailboxes as follows:

namespace inbox {
  mailbox drafts {
    special_use = \Drafts
  }
  mailbox sent {
    special_use = \Sent
  }
  mailbox trash {
    special_use = \Trash
  }
}

The problem I am having is following:

1. dovecot ignores the folders (drafts, sent, trash) and creates its own folders begining with capiotal letter:

   Drafts Sent Trash

2. dovecot ignores ~/mail/inbox and instead creates

   ~/mail/cur ~/mail/new ~/mail/tmp

can somebody please advise how to tell dovecot, to use my existing folder structure, ie:

~/mail/inbox/{cur,new,tmp}
~/mail/drafts/{cur,new,tmp}
~/mail/sent/{cur,new,tmp}
~/mail/trash/{cur,new,tmp}

any advice would be much appreciated

thanks, Martin