protonmail，proton的意思是質子，所以protonmail也被稱為質子信箱，根據Wikipedia的介紹，protonmail是由在歐洲核子研究組織工作過的成員創建的，伺服器位於瑞士。
protonmail怎麼樣？
免費版的儲存空間為1G，protonmail非常注意信箱隱私和安全，加密 加密 加密，端到端加密，自始至終的加密，郵件在ProtonMail的服務器上是加密存儲的，在伺服器與用戶設備的傳輸過程中也是加密的。支持端到端加密的信件、帶密碼的信件和到期自動刪除的信件等。
評價：好。
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