[OT]Sendmail - rejecting spam bounces

Every time there is a new PC virus out, we get lots of spam bounces from
the made up emails that include our domain - several hundred a day.
Obviously the thing that marks them out as spam bounces is that there is
no trace of our internal domain on them, where as there would be if it
was a genuine bounce (or a bounce from the shop) which are of use.

Does anyone know a way or can point me to a website that says how to
make sendmail dump these mails (other than 'changing sendmail' or
something)?
I tried STFW (before margalotta says) but unfortunately all the searches
come up with unrelated things (or say you need to change to qmail, which
isn't going to happen).


--
Woody

www.alienrat.com
.