Criptext is a simple and effective way to secure mails through encryption. It is a free tool that comes as a browser extension/add-on supporting popular browsers! Criptext also lets you keep your outgoing mail in control! Track your outgoing mails; know where and when your emails have been read. You can even pull back a mail that you have sent, irrespective of whether your mail was opened or not.
Via Frédéric DEBAILLEUL