Houyhnhnms - Yahoo! has recently changed certain settings in its email policy which will allow the company to eavesdrop on customer mail. With the new service, the search engine uses a spam blocking technology to learn about its users so they can be targeted by display advertisements.
However, this is not where it ends – Yahoo! will also hold the right to scan emails from people using other email accounts if they send emails to Yahoo! users.
In addition to this, users hold the responsibility to warn others about the changes made to their accounts. (more)
Extra Credit: How to Encrypt Your Email
