There ought to be a message on the console log. I guess the file was sent
in a format not recognized as mail, and the distribution was rejected
because files are not allowed on the list. The (NJE) sender was notified
(which probably means nobody got the message, since it looks like a
mailer machine), and the file was transferred to the postmaster just in
case the problem is due to a bug and the file is important.
Eric