ProtonMail 3.6 introduces the most requested feature from the ProtonMail community with almost 1900 votes – Two Factor Authentication.

Note: Due to the way we roll out new versions, ProtonMail 3.6 has not been released to everybody yet, if you don’t see it yet, you will see it soon.

At ProtonMail, security is always our highest priority, and we are constantly improving our technology to ensure that the email encryption we provide stays at the cutting edge. Adding Two Factor Authentication, is an important milestone in our security roadmap. For those of you unfamiliar with Two Factor Authentication, we will be publishing a longer blog post next week discussing the advantages and practical usage of Two Factor Authentication.

With ProtonMail 3.6, we are not only introducing Two Factor Authentication, we are also rolling out an entirely redesigned authentication system leveraging the research our team has been conducting over the past year. This includes the introduction of a Single Password Mode, which allows ProtonMail to be used with a single password instead of two passwords, without compromising security or privacy. Technical details of how we accomplished this can be found here. Note, we will continue to support the legacy Two Password Mode.

Both of these features are also already supported in the current version of the ProtonMail secure email mobile apps for Android and iOS. Together, these features make our 3.6 release a giant step forward in our mission to make ProtonMail the world’s most secure email service.

ProtonMail does not show advertisements or abuse your privacy to make money. Paid accounts are our only source of funding. Please consider upgrading to a ProtonMail Plus account so that we can continue to operate the service and fund further development.

Two Factor Authentication (2FA) adds an additional layer of security to your ProtonMail account by adding a second step (or second factor) to the login process to authenticate your identity. This helps protect your account from unauthorized access. A comprehensive guide on how to set up 2FA with ProtonMail can be found here.

One Password Mode removes the need to remember two passwords (Login and Mailbox), making it even easier to use ProtonMail. One Password Mode makes it easier to use 2FA by reducing the number of authentication prompts by one. Due to security enhancements that we have made to ProtonMail’s authentication system, we are able to achieve One Password Mode without compromising security or privacy. You can learn how to switch to One Password Mode by following the guide here. Note, we will continue to support the legacy Two Password Mode.

Version 3.6 Full Release Notes

New Features

Bug Fixes

Show Images no longer collapses the blockquote below

Edit Identity now visible on inactive addresses

Fixed storage space indicator bar showing incorrect amount on Windows

CSS not showing properly within message body

Fixed an issue where sometimes the number of unread messages is -1

Improvement

Show a warning message when non-ProtonMail users respond to an Outside Encrypted message the maximum of 5 times.

As always, your feedback is appreciated. Please report bugs using ProtonMail report bug feature, or send us a support request here: https://protonmail.com/support