ProtonMail:終端到終端加密郵件平臺是一個由麻省理工學院創業指導下開發的一款終端到終端的加密電子郵件系統，總部在瑞士，並基於瑞士隱私法保護郵件的隱私，對於安全基本要求很高的使用者來說，非常有用。

安全郵件的問題這幾年被提到的很多，尤其是政府、部隊方面對安全郵件的需求還是很旺盛的。ProtonMail提供端對端的郵件加密方案，並且宣佈永久免費。

ProtonMail was founded in summer 2013 at CERN by scientists who were drawn together by a shared vision of a more secure and private Internet. Early ProtonMail hackathons were held at the famous CERN Restaurant One. ProtonMail is developed both at CERN and MIT and is headquartered in Geneva, Switzerland. We were semifinalists in 2014 MIT 100K startup launch competition and are advised by the MIT Venture Mentoring Service.