Gmail Confidential Mode
Gmail’s new Confidential Mode lets users send email messages that “self destruct” and cannot be printed or forwarded. Settings allow senders to choose an amount of time before the email expires (from one day to five years) and can restrict access to the message after it is sent.
Senders can also choose to require a password to open the message. The email contains a link to the actual content of the message, which is hosted on Google servers. The Electronic Frontier Foundation (EFF) takes issue with Google’s claims of Confidential Mode’s security and privacy, pointing out that the messages are not encrypted end-to-end.