>How is From: A@B > From: X@Y RFC822 says (in 4.1) that the meaning of that is "unspecified", even though the formal definition they have chosen allows for any field to be specified any number of times. I personally chose to call that "illegal", because I can't find any reasonable interpretation and I have more important uses for my time than dealing with "lost causes" of this type. >Different from > From: A@B, X@Y (which is perfectly legal under RFC822) ? As you said later, this is legal ONLY if there is a 'Sender:' field, and the 'Sender:' field can point to only one mailbox. LISTSERV simply does not support commands or notebook database entries having more than one origin, anyway. Eric