Step 6. A Require Passcode category appears underneath the expiry date. If the person you’re emailing has Gmail and you want to add an additional degree of protection, choose SMS passcode to ask them to enter a password that will be sent to their phone number. If your receiver does not have Gmail, even if you choose No SMS passcode, they will get an email with a passcode.
At the bottom of the message, a notice indicating the communication is being delivered in confidential mode will display.
Method 2. Using the Mobile app
Step 1. Open the Gmail app on your smartphone.
Step 2. Start composing a new message.
Step 3. Tap the three dots in the app’s top right corner, then choose Confidential mode.
