LISTSERV tolerates warnings  for mail posted to a list.  After all, human
beings are  going to  read it, and  they have the  option of  using their
brains to figure out what was meant. LISTSERV does not, however, tolerate
warnings for  messages containing commands  that have to be  executed. In
this case it would  probably have worked out ok, in  other cases it could
have led to incorrect results, possibly a loop, etc.
 
  Eric