We were getting duplicate mail files here as well. The problem appears
to be related to the communications problems at node UGA. It seems that
when a VMNET link crashes, sometimes the sending node re-queues the file
even though the receiving side thinks the transfer is complete. So when
the link re-starts, the same file is sent. The connectivity problems at
UGA were so bad that the same file was being sent over and over again.
It was just a coincidence that Listserv was involved. The people at UGA
are aware that there was a problem. I believe that their communications
troubles have been resolved for the most part.
-jj