An electronic mail system and method enables the originator of a message
sent by electronic mail to select a date, time, or event at which the
message and all incarnations of the message to self-destruct, regardless
of the number and types of computers or software systems that may have
interacted with the message. The system and message also permits the
originator to include processing and handling limitations. The necessary
control over the message is achieved by encrypting the message and
enabling viewing only through a viewer applet arranged to facilitate
destruction of the message upon the occurrence of the selected expiration
time, date, or event, and to implemented the handling and processing
limitations. A central server can be used to exercise additional control
over the message by serving as a proxy destination, and by streaming the
encrypted message to the viewer applet. The viewer applet can be
transmitted to new recipients with the message so that the system and
method can direct mail to any electronic mail user.