fix: Ignore protected headers in outer message part (#6357) #6370
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link2xt
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Dec 28, 2024
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link2xt
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Jul 14, 2025
Delta Chat always adds protected headers to the inner encrypted or signed message, so if a protected header is only present in the outer part, it should be ignored because it's probably added by the server or somebody else. The exceptions are Subject and List-ID because there are known cases when they are only present in the outer message part. Also treat any Chat-* headers as protected. This fixes e.g. a case when the server injects a "Chat-Version" IMF header tricking Delta Chat into thinking that it's a chat message. Also handle "Auto-Submitted" and "Autocrypt-Setup-Message" as protected headers on the receiver side, this was apparently forgotten.
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