When sending emails to somebody that's not using ProtonMail, messages are encrypted with TLS, but only if the other email service supports it. All of this is done automatically with no work from the users. The sender uses the recipient's public key to encrypt the message, then the recipient decrypts the message with his/her private key. Best of all, they won't even have to install any other apps or extensions to read or reply to the messages.īy default, emails sent from one ProtonMail user to another use asymmetric cryptography to provide end-to-end encryption. It can be hard to get all of your friends, family, coworkers, and acquaintances to jump on board with the more-secure email system ProtonMail, but that doesn't mean you can't still send them encrypted emails.
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