Sometimes braindead mail sytems can make returned mail *seem* to come
from the list.  They can be nasty to get rid of (mail loops).
 
However, here you seem to have different domains.  Note that for the
domain it is COM rather than AU.  Is there really a latrobe.edu.COM ?
If so, does it really have anything to do with latrobe.edu.AU ?
I've never heard of an edu.COM before, but I don't keep keep up with
everything all the time (maybe that should be most things most of the
time).
 
Check your subscriber list.  Have you got any with the userid
ACIM?  If so, you might want to start there.  And maybe think about
not allowing subs with userids the same as your listname (tell them
to put in something to differentiate it).  And, maybe,  you might
want to put in a * Filter= Also,acim@*
 
Douglas
       Douglas Winship   Hays County, Texas  [log in to unmask]
                    Secondary AUTOCAT Listowner
                              MEDLAB-L