How about using the USENET keyword of NEWSGROUP: and making that a replyable field with a higher priority than that of Sender: for notification/rejection purposes. Not that I intend to redefine the way that RFC822 works - but if MAs like MAILBOOK are going to be picky - then I consider it our duty to find a way around it in order to keep a more efficient distributed-mail-network. yes? - Michael Gettes, Boston University I guess this is meant for Eric since he is the only one responding.