Prime example of MAIL TRANSFER AGENTS using the Sender: address for reporting problems: The IBM-NETS list this weekend had problems sending mail through the MIT-MULTICS gateway (again!) and the Multics Gateway sent the problem report to the Sender field which was - of course - IBM-NETS @ BITNIC (at least I thought it was IBM-NETS; Monday morning - I may not be thinking straight.) Anyhow, I got something like 6 or 7 copies of this error-reporting mail. I would hope that this would spark the need for realization of implementation instead of just imagination. Any thought? - Michael Gettes, Boston University