新版 Gmail 已经可以使用了，右上角的 Setting > Try the new Gmail
大家如何看待新版 Gmail 这三个新功能？
Well, now you can simply click the lock icon at the bottom of an email to enable the new Confidential Mode, which lets you add a bunch of extra layers of security (as mentioned below) to the emails of your choice.
- Self-Destructing Emails: This feature lets you send emails that disappear from the recipient's inbox after a period (between 1 day and five years) you specify or which you can revoke at any time even after you have sent them.
- Un-Forwardable Emails: Confidential emails open in a special window that does not allow the recipient to forward, copy or print the email, though recipients can still grab a screenshot, or snap a photo from their phone.
- Two-factor Authentication (2FA) for Emails: If you're paranoid, you can even enable 2FA for a single email, requiring recipients to enter a secret passcode send to them via SMS before opening it.
All the above Confidential Mode features work even with emails sent to non-Gmail users, requiring them to click on a link before opening confidential emails.