It would appear to me that the [log in to unmask] is
using the RFC822 ERRORS-TO: field embedded in
the message to bounce the message.  I'll bet
there will some debate if that is correct.
 
I suggest that you DELETE those subscribers that
are no longer valid, and SET NOMAIL (or possibly
DELETE) those that have full mailboxes.
 
--  co-owner:   INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
URL:mailto:[log in to unmask]                "I get paid by the millisecond"