Meta-owned messaging app WhatsApp is continuing to add safety layers. Since the app was born, it has allowed users to login with a mobile phone number. Now, it has started testing a new feature which allows users to link their email with their WhatsApp account. Mind you, this follows security features which have been recently added like Chat Lock, Device Verification etc. The ability to add your email to your WhatsApp account adds a verification layer to the app, allowing you to use it for account authentication in addition to your mobile number, which was the only option earlier.