Well, sending the question to DEAR-BOD might be appropriate. This way it would be on the agenda of the next BoD meeting, and they might come out with a Directive for the Prohibition of Non-Standard Mail Gateways, "Standard" being defined as per a Future Proposal from a Gateway Task Force. Since this question affects the whole network and is of interest to everybody, I will answer it. The best recommendation is to use a subject starting with UNDELIVER (case is irrelevant). There are a number of other 'tabu' subjects, like RETURNED NETWORK MAIL. In any case, a copy of at least the original header, IN RFC822 FORMAT (ie NOT in JANET or UUCP or X.400 form), should be included in the BODY of the rejection notice. Eric