Ok Michael, now please explain me how the Multics mailer will react when I place an "Errors-To: CCMRG@BOSTONU" in the mail header. The Multics mailer is obviously the culprit. It is generating a new piece of mail with a different message-id, telling you that your original piece of mail (which one?) has been processed without crashing the Multics system (hey, good news!!). It's more or less the same as a DVM which would be subscribed to a list and would send out a piece of mail saying "Buuurps" to the list every time a contribution is received. Eric