Proton Mail is a Swiss end-to-end encrypted email service founded in 2013. Proton Mail uses client-side encryption to protect email content and user data before they are sent to Proton Mail servers, unlike other common email providers such as Gmail and Outlook.com. Proton Mail is run by Proton AG, which also operates Proton VPN, Proton Drive, Proton Calendar, Proton Pass and Proton Wallet.
Proton Mail received its initial funding through a crowdfunding campaign, and initial membership was by invitation only; however, beginning in March 2016, Proton Mail was opened to the public. Acquiring more than two million users by 2017, membership grew to almost 70 million by 2022.
The source code for the back-end of Proton Mail remains closed source. However, Proton Mail released the source code for the web interface, iOS and Android apps as well the Proton Mail Bridge app, under an open-source license.
History
On May 16, 2014, Proton Mail entered into public beta. It was met with enough response that after three days they needed to temporarily suspend beta signups to expand server capacity. Two...
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