[Exim] Problem with Delivery to /var/mail

Hi all.

Here's my debug -d9 -bt output

queued for local_delivery transport: local_part=ccao domain=fastech.com
localuser director succeeded for ccao
  transport: local_delivery
ccao@???
    <-- ccao@???
  deliver to ccao in domain fastech.com
  director = localuser, transport = local_delivery  

Ok. so exim got its head straight about who I am and where it's about
to do. My configuration is the default:

local_delivery:
driver = appendfile
file = /var/mail/${local_part}
delivery_date_add
envelope_to_add
return_path_add
group = mail
mode = 0660

localuser:
  driver = localuser
  transport = local_delivery      

but nothing under /var/mail. Oh yea...I already did chmod 0660 and chgrp
on /var/mail.

Thanks for any help.

C