[Exim] Exim & Mysql configuration

Hi,

I'm newbie with Exim.
Since Exim include Mysql capabilities, I would like to configure exim to
look on a database:
The database include 2 fields called 'name' and 'mailbox'

'name 'is the name of the user, 'maildrop' is the location of the
mailbox:

ex:
    name: a000
    mailbox: /var/spool/mail/a/0/00

I want that, when a mail arrive to a machine (called smtp for ex.), this
machine connect to a database on another machine and fetch the mailbox.
The mail will be delivered to this mailbox.

I hope I'm clear.

Please help me.

Laurent Luyckx