This is done using a self-signed TLS/SSL certificate that Bridge generates when you first set up the app. Securing Proton Bridge to Client connectionīridge sends your decrypted data to your chosen email client on a restricted communication channel that never leaves your device (via the loopback/localhost interface on 127.0.0.1).Īdditionally, Bridge, by default, adds a layer of encryption (STARTTLS or SSL) to prevent unauthorized apps on your device from monitoring the local data that is exchanged. In this article, we explain how Bridge secures its connection to your local email client and how to troubleshoot the most common errors. To work around this issue, temporarily set the SSL field to None instead of STARTTLS when setting up your account on Thunderbird. This causes an error when sending messages via Bridge.
NOTE: Thunderbird 78.3.X doesn’t allow adding self-signed SMTP certificates.
