Re: [Dovecot] Thunderbird STARTTLS error

I got only this keys. Can you explain me what exactly you mean with adding chains? And I wonder why this error only occurs in Thunderbird, not in openssl.

Never mind, I don't think my first guess was correct. I wonder if it has to do with the error 27 reported in the verify by openssl. According to the manual, an error 27 means:

"the root CA is not marked as trusted for the specified purpose."

It looks like the certificate is valid cryptographically, but that it wasn't certified for how you're using it.

If I run:

openssl x509 -in ssl.crt -noout -text

The output includes the following:

         X509v3 Extended Key Usage:
             TLS Web Server Authentication, TLS Web Client 

Authentication X509v3 Key Usage: critical Digital Signature, Key Encipherment

Does yours look different?