handling public namespace (under mdbox/sdbox)

[Michal Soltys]

Besides of course a "dummy" user that has admin rights to all subfloders 
- and handles delivery via Public/ prefix. For example using: 
public-dummy+Public/path/to/subfloder.

But - with maildir I've been using a dedicated user that sees public 
namespace as its own mailbox - so all the alises/redirects go w/o 
Public/ prefix in such case - for example: 
public-dedicated+path/to/subfloder . This has been working fine with old 
maildir, but will this be ok for dbox mailboxes as well ?