*> 
  *> to this reader the above strongly suggests that we ought not to mess with
  *> the "try-really-hard" principle of SMTP, just because some small amount of
  *> spam reduction can be had by making delivery "brittler" or subject to more
  *> conditions having been met. 
  *> 
  *> -- 
  *> Måns Nilsson    http://vvv.besserwisser.org
  *> 
Unfortunately, I believe we are in the situation in which SMTP is
simple, robust, and increasingly *useless*.  We have to bite that
bullet and swallow it... ;-)
Your metaphor mixer,
Bob Braden