According to Google, “You can send messages and attachments with Gmail’s confidential mode to help protect sensitive information from unauthorized access. You can use confidential mode to set an expiration date for messages or revoke access at any time. Recipients of the confidential message will have options to forward, copy, print, and download disabled.”
Confidential mode is now available on mobile devices and can help you protect sensitive information from unauthorized access. Learn more about this feature → https://t.co/lmQNElH6C1 pic.twitter.com/Nxtx2yU0pG
— Gmail (@gmail) August 16, 2018
Users who send emails under Confidential Mode can passcode protect emails. This means that the person who is reading the email will need a passcode to unlock it. This is done either by a passcode being sent via SMS, or if the recipient is not a Gmail user, they will be emailed a passcode instead.
There will also be the option to revoke access to the email, and the contents of said email cannot be copied, downloaded, printed, or forwarded. So if you do have the need to send such emails, do keep an eye out for the feature which should already be live.