ProtonMail is an end-to-end encrypted email service founded in 2013 at the CERN research facility.ProtonMail uses client-side encryption to protect email contents and user data before they are sent to ProtonMail servers, in contrast to other common email providers such as Gmail and Hotmail. The service can be accessed through a webmail client or dedicated iOS and Android apps.
ProtonMail is run by Proton Technologies AG, a company based in the Canton of Geneva, and its servers are located at two locations in Switzerland, outside of US and EU jurisdiction. The service received initial funding through a crowdfunding campaign. The default account setup is free and the service is sustained by optional paid services. As of January 2017, ProtonMail has over 2 million users.