I have one address on a server I administer that seems to have been grabbed as 
a spoof address.  I get fifty or so bounce messages per day that appear to be 
spam that's used that address as a return.  As far as I can tell nothing is 
actually relaying through my server, but it sure is a pain to be flooded with 
the debris.  I've missed one real problem with the server because I was just 
deleting them all without looking at them.  If anybody has suggestions on 
dealing with this I'd love to hear them too.