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On, ProtonMail entered into public beta. In 2017, ProtonMail had over 2 million users, and grew to over 5 million by September 2018, 20 million by the end of 2019, and over 50 million in 2020. Initially invitation-only, ProtonMail opened up to the public in March 2016. Although the default account setup is free, the service is sustained by optional paid services.
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ProtonMail received initial funding through a crowdfunding campaign. The company also operates ProtonVPN, a VPN service. ProtonMail is run by Proton Technologies AG, a company based in the Canton of Geneva. The service can be accessed through a webmail client, the Tor network, or dedicated iOS and Android apps. ProtonMail uses client-side encryption to protect email content and user data before they are sent to ProtonMail servers, unlike other common email providers such as Gmail and. ProtonMail is an end-to-end encrypted email service founded in 2013 in Geneva, Switzerland by scientists who spent time at the CERN research facility.
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