HOWTO Add SMTP Receipt Notification to a mail

This article is incomplete and was first written in January 2007
for the BeezNest technical website (http://glasnost.beeznest.org/articles/353).
Receipt Notification (or "Accusé de réception" in french) can be very easily added to an e-mail by adding the following line in the e-mail's SMTP header:
"Disposition-Notification-To:address@domain.extrn"
Where address@domain.ext is the e-mail address you want the receipt notification to be sent to AND r should be the end-of-line marker of your SMTP server.