Help With a Simple Mail Script...

I have a mailbox that receives orders. I would like to create and send a new identical message to every sender of every message in that mailbox. The reason I cannot simply use the Reply rule is because the original message contains sensitive material which I do not want the recipient of the reply to see. I know this is easy but I’m not able to nail it down. I can get it to send to the first or last person but not all.