Quote:
Proton website reads:
When you send an encrypted message to a non-ProtonMail user, they receive a link which loads the encrypted message onto their browser which they can decrypt using a decryption passphrase that you have shared with them.
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I sent an encrypted message to a non-ProtonMail user. That email was read with the Thunderbird client with the 'ThunderBrowse' add-on enabled in it. That add-on is basically a web browser that loads pages into the 'message body' field. So this encrypted email was read , the link clicked on, and the ProtonMail 'Decrypt' page as well as the message itself when the passphrase was entered was displayed in the email client. EasyPeasy!