Send an email that disappears after it is read. Yes you can!

There may be times when you want to send a message that leaves no traces. Since "deleting" an e-mail doesn't really remove it from the sending server--let alone from the recipient's in-box and all the stops in between--you need a messaging system that keeps the message itself outside of either e-mail account. You also need to ensure that the text will disappear once it has been read.

That's the idea behind the free Privnote service. Write your note on the site, check the option to "Notify me when this note gets read" if you wish, and click Create Note to generate a link you can paste into an e-mail to the note's recipient. Compose your note in a text box on the Privnote site and then send a link to the note's recipient; after it has been read, the note is erased.

After the person opens the note and closes the page, the note disappears. The recipient can copy and paste the note's contents, so you can't be sure the message will not reappear elsewhere, but at least you know only the person who receives the link has access to the note. The recipient is given the option to compose another secure note.  (Credit: Screenshot by Dennis O'Reilly)