> > The formula is that there has been more than 50 more failures than
> > successful deliveries to a given address.  Each time a bounce is
> > received, a counter for that address is incremented by two.  Each
> > time a message for a list is sent out, all counters are decremented
> > by one.  If the counter is greater than 100, that address will be
> > unsubscribed the next time I process the bounces.
> 
> Surely that can't be all there is to it, or I (who have received
> probably several thousand netbsd.org list messages) would take on the
> order of a year to get unsubscribed even if every message to me started
> bouncing.
> 
> Is there a floor on this counter, or anything equivalent?

Yes, the floor is 0.  That helps keep the database size down too, as
it only contains addresses which have bounced.

	--jtc