Help with Mailman version 2.0.13

[FooBar]

I need some help please.  I asked on the Mailman list and no one seems 
to knwo the answer.  I want to set up Mailman so that it just blackholes 
email that is sent to the list from non-subscribers.  I knwo how to 
configure things so that such posts are not sent to the list, but this 
makes them go to an admin holding bin and each mail must be manually 
rejected.  The file that handles this is Hold.py and it looks like that 
line 152 calls the hold_for_approval function.  I think that if I could 
comment that line out and add the line to call the function that black 
holes the messages but I do not know what that function is.  Can anyone 
point me in the right direction here?  Thanks!


DB