On mcdonalds.com, if you click the "Ronald McDonald House Charities" link, you will read this: "McDonald's is not responsible for the opinions, policies, statements or practices of any other companies, such as those that may be expressed in the web site you are entering"!
Strange... without the undo feature you will need to send another e-mail to that person or another time the same e-mail to the right person. In this way google will display more ads and earn more money... maybe it will be a 'pay for undo', or a 'this undo was sponsorized by ___'