> If the sender is concerned about optimizing for each recipient, they can > get that effect by reducing to a single RCPT-TO per DATA. if several recipients have similar capabliities, sending a separate copy of each message hardly seems like an optimization. > So it is not as pretty as the separate command, but it permits roughly the > same mode of operation. overloading RCPT is simply unacceptable. It would be a Bad Idea for any SMTP extension, but this proposal pre-empts RCPT error reporting for a very specific application. Keith