Gmail's "Confidential mode" provides a method of sending emails and attachments that will expire and include passcode protection. Here's how to use it:
1. On your computer, go to Gmail.
2. Click the "Compose" button.
3. In the bottom of the "New Message" window, click on the padlock/clock symbol to turn on "Confidential mode."
Tip: If you've already turned on "Confidential mode" for an email, go to the bottom of the email, then click Edit.
4. Set an expiration date (1 day to 5 years) and passcode. These settings impact both the message text and any attachments.
If you choose "No SMS passcode," recipients who use Gmail will be able to open the message directly. Recipients who don't
use Gmail will be emailed a passcode. Note that Gmail creates and sends the password, not you.
If you choose "SMS passcode" you will be asked later to enter the recipient's text message phone number. Note that Gmail
creates and sends the password, not you.
5. Click on the "Save" button.
6. Enter the recipient's name, message subject and message. Note that the message subject will not be concealed in
7. Click on the "Send" button. If you previously chose "SMS code," you will be asked to enter the recipient's text message phone
Note: The Gmail phone app also includes "Confidential mode."
Send Secure Message or Document