Jesus Cea wrote:

> 500 GB of harddisk :-p. I'm planning to migrate my mail system
> (currently about 300 GB of user mailboxes, stored under a UGLY mbox
> format) to Durus, but I need better write behaviour, since mailbox
> read/write is 1:1. I was planning to migrate the mboxes to BerkeleyDB

Not to point out the obvious, but why not just us maildir?  Python can
read that, as can most any other tool from the last 5 years.  Serve it
up via IMAP & call it a day.