What computer program is used to advise the sender that an email has been opened by the receiver?

This usually works when Outlook or Outlook Express work through a server running Microsoft Exchange. On a corporate network, which may have many servers, they may all be running Exchange so the read receipts can be transmitted between servers.What computer program is used to advise the sender that an email has been opened by the receiver?
Use outlook or outlook express.





Before you send your email, click options.





Here you can click notify when email is opened.