Hi, Certificates from Let's encrypt are cross-signed by Digital Signature Trust Co. (DST root CA X3). The DST certificate is present in my Android 6.0.1 credential store by default. However, K-9 mail does not recognize the Let's Encrypt certificate and produces an error. I can accept the certificate anyways but it pops up every once and a while. Does K-9 mail not properly recognize cross-signed certificates?
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