>  The DISTRIBUTE method that was suggested instead of probes will suffer from
>the same problem, as there isn't any way to identify which list subscriber
>the bounce pertains to, right?
 
I've used a DISTRIBUTE job containing addresses of all subscribers and was
able to find a particular email address that had forwarding and was bouncing
errors back for weeks....postmasters at the forwarder/fowardee site were of
no help...in addition I was able to discover NOMAIL addresses that were no
longer valid.
 
 Bob