Gmail Confidential Mode
- In the Gmail app on iOS or Android: after composing your email, tap the three-dots button. ...
- Tap Confidential Mode.
- Tap Expires in 1 week.
- Set an expiration time, and tap Done.
- Tap Standard.
- Select between SMS passcode delivery or Standard Confidential mode, and tap Done.
- Tap the Check mark.
- Tap Send.