Exim bounce message

[tps@unslept.com]

I know I'm not the first one to try this out, but I can't find anything
on the exim site, so I turn to you guys. :)

As many of you know, I work at bnl.gov (Brookhaven National Lab) during
the day. I've implemented a Perimeter Defense network (firewall) utilizing
a Cisco Pix, and application proxies running Debian. Along with this, I have
a smtp gateway that all mail must pass through. We are getting ready to
start blocking email directly to the individual machines, and making
all mail go to 'user@bnl.gov'. However, I'd like Exim, on the smtp gateway,
to be able to send email back to the sender, if the email is sent to
user@machine.bnl.gov, sorta like "I'm sorry, mail to this machine is 
disabled. Please try sending mail to user@bnl.gov bla bla bla". I can;t
figure this out. Anyone else try something like this?

Thanks,
Tim

-- 
   >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
   >> Tim Sailer (at home)             ><  Coastal Internet, Inc.          <<
   >> Network and Systems Operations   ><  PO Box 671                      <<
   >> http://www.buoy.com              ><  Ridge, NY 11961                 <<
   >> tps@unslept.com/tps@buoy.com     ><  (631) 476-3031                  <<
   >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<