https://www.theverge.com/2019/5/29/18644525/gmail-confidential-mode-on-default-g-suite-june
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https://www.theverge.com/2019/5/29/18644525/gmail-confidential-mode-on-default-g-suite-june
origin - https://www.pipiscrew.com/2019/05/gmail-confidential-mode/ gmail-confidential-mode