read mail in mbox files

[ernest]

Hi,
This is my setup: I use fetchmail to get mail from
different POP/IMAP servers, then split the incoming
mail with procmail into different mbox files in ~/Mail.
What I'd like is gnus to work directly on these mbox
files. Is this possible? What backend do I need?
I'd say I don't even want a backend, because I don't
want to copy mail anywhere!
Frankly, I'm a bit confused :/
Cheers,
Ernest