The yet-to-be introduced feature works quite much like expiring emails in "ProtonMail" in which the email becomes unreadable after some time.

The search engine giant has another feature up its sleeve called "confidential mode" that will allow users to limit what recipients can do with the emails you send, preventing them from being forwarded, downloaded or printed, according to another report in The Verge.

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"Google will also let Gmail users require a passcode to open emails, which will be generated via SMS, or set an expiration date on sent emails," The Verge reported.

"The features are very similar to some found in Microsoft's full Outlook application and Microsoft is also adding the ability to restrict emails on its Outlook.com service," the report added.