[Exim] Virtual Domains

Hi,
Running exim 2.11 with virtual domains. Is there anyway to set it up so
that
if a mail address doesn't exist it goes to another email address instead of
being rejected. ie mail gets sent to dog@??? dog doesn't exist
so it then forwards it to reception@???
I would prefer it to be domain specific.
Any one know how to do this or could point me in the right direction.
Looked through the docs that came with it, with no success.
TIA
cya
Andrew

SEOL System/Network Administrator
admin@???
awd@???
99 Commercial Street East
MOUNT GAMBIER, SA, 5290
Ph +61 8 8724 9796
Fax +61 8 8725 4983
Providing Internet Access to the South East
----------------------------------------------------------------------------
------