This is a Return Receipt for the mail that you sent to xxxx.
Note: This Return Receipt only acknowledges that the message was displayed on the recipient’s computer. There is no guarantee that the recipient has read or understood the message contents.
Oh. Even mail delivery systems (which usually send out highly technical and complicated messages) start expressing themselves like lawyers.
But if they specify this, maybe that means it’s a functionality they’re working on, and pretty soon you’ll be informed immediately when someone you wrote to hasn’t properly understood your message. That will be helpful. It will drown our mailboxes with warning notices, but it’ll sure be helpful. Or maybe it should just be an elementary auto-reply system embedded only in Outlook.