A ProtonMail subscription lets you access your e-mail via a locally installed mail client, such as Outlook or Thunderbird. It involves installing a separate program called ProtonMail Bridge which handles communication between their server and the client software, taking care of all the encrypting and decrypting.
A ProtonMail subscription lets you access your e-mail via a locally installed mail client, such as Outlook or Thunderbird. It involves installing a separate program called ProtonMail Bridge which handles communication between their server and the client software, taking care of all the encrypting and decrypting.