To prevent potential bugs from  causing loops, LISTSERV generally refuses
to process "unexpected" files from itself. That is, when LISTSERV sends a
file to  itself with intent to  later process it,  it sets a flag  in the
file descriptor  and, if  the flag  is not present,  it later  refuses to
process the  file. Such  files can  be created even  without bugs  if the
server is abruptly  stopped while it was preparing a  file for some user.
If  you GIVE  a file  to LISTSERV  or to  a list,  this is  not something
expected and the file is rejected. However you should be able to have the
file in  question *mailed* to the  list, by specifying F=MAIL  on the AFD
command.
 
  Eric