Using Thunderbird with a YubiKey
Is it possible to use integrate Proton Mail that's secured with a YubiKey and an Inbox password? Attempts to follow instructions with Mail Bridge were unsuccessful.
Posted Sep 18, 2022, 2:48 PM UTC
22
I'm using Bridge + Thunderbird with both 2FA and two-password mode enabled. First setup up the account in the Bridge, which will ask for your Proton account credentials. Inside the Bridge, you will see you need to use 127.0.0.1 (localhost) and the port numbers for IMAP and SMTP. The username needed should be your primary Proton e-mail. The password must be the password given in the Bridge.
All this is safe, as the IMAP/SMTP ports on the Bridge should never be exposed on the Internet at all; it is all happening locally on your device.
2
What exactly do you mean by "secured with a Yubikey"? Proton currently does not support Webauthn, so I assume you mean the Yubico authenticator, which uses 2FA via TOTP (6-digit one-time codes). This is absolutely supported by the Bridge, and so is 2-password mode. Remember, you only log in to your Proton account in the Bridge. In Thunderbird you use the local credentials generated by the Bridge.