I'm having the same problem.  Did I miss a response to the inquiry?
 Computing Affairs, Southern Illinois University at Carbondale
 Faner Hall 2032                  (618) 453-6271
 *** Forwarding note from LSTSRV-L--POLYGRAF 03/23/90 03:38 ***
 
 
 >The enclosed mail file, found in the SUMMER reader and shown under the
 >spoolid 0017 in the console log, has been identified as a possible delivery
 >error notice for the following reason:  "Sender:", "From:" or "Reply-To:"
 >field pointing to the list has been found in mail body.
 
 The message is followed by the mail reply that the user was trying to post.
 Is there any way to turn off this error to allow the mail to be posted to the
 listserv?
 
 * Taryn L. Westergaard           (602)621-2996
 * BITNET: taryn@arizvm1          INTERNET: [log in to unmask]