The new confidential mode gives users the ability to place restrictions on emails as part of an effort to keep them from getting into the hands of people who should not have them.
Google has announced this morning that the feature has now gone live in the Gmail for Android app. You can use the feature to set an expiration for your emails, letting you remove an email and its content after a certain period of days. You can also set an expiration date and passcode for a message or attachment that you're sending.
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"You can send messages and attachments with Gmail's confidential mode to help protect sensitive information from unauthorized access", Google explains on its support page for the new feature. Recipients may still be able to do things like take screenshots of emails or even using a camera to take a picture. There's a new option in the overflow menu at the top called "Confidential mode". If you have the update app, open it and tap on Compose icon on the bottom right.
It is worth noting once an email is sent any self-destruct date that was chosen can not be altered. Another minor downside might be if you don't check your email a lot, and then the message expires before you've seen it. Only the recipient with the authentic passcode will be able to access the contents of the sent email. Ensure you enter the recipients phone number not of your own. Also, depending on your settings, the attachments in the mail will be or will not be secured by a passcode.