[Dovecot] dovecot IMAPS + kmail

[Timothy Murphy]

I notice that kmail does not allow an IMAP sub-folder to be created
(from an IMAPS client).
When I try, kmail says this cannot be done for one of the following reasons:
        Your access permissions may be inadequate to perform the requested 
operation 
        on this resource.
        The location where the folder was to be created may not exist.
        A protocol error or incompatibility may have occurred.

Is there any simple way of getting round this?
KMail has no problem creating top-level IMAP folders.