NY Times: A New Trick Gives Snoops Easy Access to E-MailFeb 05, 2001, 19:01 (5 Talkback[s])
(Other stories by Amy Harmon)
"For those still harboring the illusion that e-mail exchanges are private, a watchdog group has uncovered a new trick that enables someone to essentially bug an e-mail message so that the spy would be privy to any comments that a recipient might add as the message is forwarded to others or sent back and forth."
"The maneuver does not take advantage of any security flaw in e-mail software. It is simply one feature of a fancier and increasingly common form of e-mail known as HTML mail, which enables users to send and receive e-mail messages that look and act like a Web page."