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Page: 3.2 Proton Mail Bridge Users
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3.2 Proton Mail Bridge Users
Samuel FORESTIER edited this page 2025-01-11 19:21:01 +00:00
Table of Contents

About Proton Mail Bridge integration

thunderbird user.js enforces certificate strict PKP (Public Key Pinning) verification. This breaks software performing MITM (such as a local antivirus), or even Proton Mail Bridge.

When connecting Thunderbird for the first time to Proton Mail Bridge, this hardening measure (1223) must be relaxed :

  • security.cert_pinning.enforcement_level to 1

Once incoming/outgoing servers enrollment is done, you may switch back to template value :

  • security.cert_pinning.enforcement_level to 2