The mailer and LISTSERV(tm) log files would be the best source of
information - for example, what exactly is in the logfiles at the time
the message from the application arrives?  And, based on what you've
included below, is "the application" in fact generating messages
addressed to "[log in to unmask]"
rather than the usual list address (not "-request")?  What is the FROM
address in the application-generated messages, and have you looked in
that mailbox to see what is being sent there?

To see who has been served off, submit a SERVE LIST command, but there
is some chance that only works for the Postmaster, I'm not sure about
that point.

>>> [log in to unmask] 8/12/2005 2:04:17 PM >>>
How can I get a list of those served out, rather than guess as to who
has. 
I have done SERVE on the obvious.
Do you think it is worth doing LOOPCHECK NONE for a short time? 
What else will tell me what the error actually is rather than this
generic garbage below?
Is there some debug prameter I can turn on for a short time to catch
this error?

THE ERROR
------------------------------ Message in error
-------------------------------
Received: from s-listserv.thomsonlearning.com
(s-listserv.thomsonlearning.com
          [198.80.146.63])
	by s-listserv.thomsonlearning.com (8.11.6/8.11.6) with ESMTP id
j7CF59232447
	for <[log in to unmask]>; Fri,
12 Aug 2005
                         11:05:09 -0400
Date:         Fri, 12 Aug 2005 11:05:09 -0400
From: "L-Soft list server at S-LISTSERV.THOMSONLEARNING.COM (1.8e)"
              <[log in to unmask]>
Subject: Your message to
[log in to unmask] 
To: [log in to unmask] 
Message-ID:  
<[log in to unmask]>
X-LSV-ListID: SW-CONNECTION

Fri, 12 Aug 2005 11:05:09

Your message  to [log in to unmask] 
has
been  forwarded  to  the  "list   owners"  (the  people  who  manage
the
SW-CONNECTION list). If  you wanted to reach a human  being, you used
the correct procedure  and you can ignore  the remainder of this
message. If you were  trying to send  a command for  the computer to
execute, please read on.