Erasing or Changing Emails Even After They're Delivered: Good Idea?

techconsumer.com — "A new service allows you as the email sender to control emails even after they?ve landed in the recipient?s inbox. I was intrigued both from a technical perspective (i.e., how does it work?) and from a sociology perspective (i.e., what does potentially needing this technology tell us about ourselves?)." Jul 24, 2007 View in Crawl 4