I'm afraid I don't understand the question. One thing I can say is that MAIL-11 + VMSMAIL is not an RFC822 mail system, it's a VMS/DECNET mail system. It does not have a *concept* of 'Sender:' or 'Reply-To:' or the like, it knows about the person who sent the message, period. Given a message with 'From:', 'Sender:' and 'Reply-To:' pointing to 3 different addresses, which one should you select as the origin (and recipient of any reply to the message)? Eric