When sending a confidential email you also have the option of requiring a SMS passcode to open the message. Google states that users can send messages and attachments with Gmail's confidential mode to help protect sensitive information from unauthorized access.
For users to make the most of the new feature they have to be in an email thread. Basically, it lets you send self-destructive emails that will be deleted automatically in the said time.
Keep in mind that once the email is in Confidential Mode, any attachments, documents, or pictures will also be locked.
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To begin with, ensure that your Gmail app is up to date with the latest version 8.7.15.
In case you want to stop the recipient from opening the email before the expiration date, here's what you need to do.
It is worth noting once an email is sent any self-destruct date that was chosen can not be altered. If you choose " No SMS passcode", those using the Gmail app will be able to open your message/attachment directly, while those who don't have a Gmail account will get emailed a passcode.
Open the mail sent via Confidential mode, scroll down to the bottom of the screen. With apps like BHIM, when you enter the payments mode and take a screenshot, it either gives an error that you can't take screenshots, or on some phones it captures complete black photos.