[Dovecot] Per-namespace proxying?

[VanL]

Hello,

Searching in the archives, I saw the following posting from Timo Sirainen:

[Dovecot] Roadmap to future (06 Dec 2007):
[...]
> Proxying
> --------
>
> - These could be implemented to v1.2. - Log in normally (no proxying)
> if destination IP is the server itself.
>
> - Support for per-namespace proxying:
>
> namespace public {
>   prefix = Public/
>   location = proxy:public.example.org
> }
>
> There are two choices for this: Dummy IMAP proxying or handling it with
> a mail storage backend. Dummy IMAP proxying would just let the remote server
> whose mailbox is currently selected handle most of the commands and their
> replies. I'm just afraid that this will become problematic in future.
>
... (continues)

Was this feature ever implemented? Is it in the 1.2 alphas?

On a related note, were virtual mailboxes implemented?

Thanks,

Van