If the certificate chain of an S/MIME certificate is incomplete (often missing the root certificate), the validity for that ID (trust level) is shown as "invalid". Currently with an "?" icon next to the text in the certificate details:
{F25785078}
Please
- Replace the "?" by the red "x" icon, as the certificate is unusable like this
- Add some explanation why the certificate is invalid. In case "invalid" and the root (or next level up) certificate is missing, add the text ~", the certificate chain is incomplete." (As it might be that not only the root certificate is missing as in this example, but a chain of certificates.)
By the way, this is the details view of the same certificate after the root certificate was imported but without answering the "do you trust this certificate" question:
{F25785233}