>One can bury one's head in the sand if one likes, but non-receiving >domains that turn on nullmx (or whatever it ends up being called) >need to be aware that in practice they will find their mail rejected >by many receiving systems if they attempt to use such a domain in >the "MAIL FROM:<return-path>". As I think I said in the summary note a few days ago, my updated copy of the draft now says pretty much that. R's, John