ezmlm-weed blocking bounce messages?

I took a peek at the ezmlm-weed source and the "weeded" bounce 
message (maybe I should have done that before my first post), and 
think I see the problem.

ezmlm-weed contains:
     if (stralloc_starts(&line,"Auto-Submitted:"))
       _exit(99);


and the bounce contains:
Auto-Submitted: auto-generated (failure)


I'm not sure what kind of problems I might have if I removed that 
test from ezmlm-weed.  Of course, it shouldn't be any worse than my 
current "fix" of not running ezmlm-weed at all.  Any thoughts on how 
common "Auto-Submitted" messages are, and how likely I would be to 
drop subscribers for "bouncing" if I took that check out?