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GMX SMIME Cert valid but get ERR msg when I trying to send a signed email

wschrabi replied
wschrabi

I have Thunderbird 128.5.2esr and my email SMIME certificates are not assigned correctly when I send them to GMX. What can I do, are there bugs? 1) Select Cert Screencopy of SELECTION 2) err msg: Err-MSG at sending

I have Thunderbird 128.5.2esr and my email SMIME certificates are not assigned correctly when I send them to GMX. What can I do, are there bugs? 1) Select Cert [https://box.medunigraz.at/s/m5faFftcX7jwSpH Screencopy of SELECTION] 2) err msg: [https://box.medunigraz.at/s/JDpH6dNdmpLHmwk Err-MSG at sending]
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Chosen Solution

After I add the SMIME root CA Certificate for Certum Certum ROOT CAs I could do it successfully.