LISTSERV already has in place the vehicle you need. The list owner can set the Ack keyword to either Yes, No, or Msg, and indivuals on the list can set their preference by TELLing LISTSERV to SET ACK YES or NO or MSG. "Yes" requests full acknowledgements, and is the default. "No" currently sends one interactive message saying "Your mail for ... has been successfully processed.", but it has been suggested that even that is too much. "Msg" causes the stats to be sent via interactive messages instead of as a mail file. The only thing missing is a way to set the Ack value for senders who are not also receivers (although changing the list's value would probably do the trick at the expense of those who haven't made up their minds.) Ross