[Dovecot] Separate access to different "folders" of the same mailbox?

[Timo Sirainen]

On Thu, 2011-02-10 at 09:15 +0200, Alexander Chekalin wrote:

> in my company we have a mailbox that holds a copy of every message that 
> our SMTP processed. While it eats a lot of space, it saved us several 
> times when, you may imaging, user "suddenly" deleted the most important 
> message in his life and call our IT guys for help. The mailbox contains 
> "folders" for each day (like 2011-02-10), which keeps mailings for that 
> day only.

Besides the archiving options others mentioned, there's
http://wiki2.dovecot.org/Plugins/Lazyexpunge