Hello Thomas, I'm experiencing the same problem.
Please note: S/MIME worked fine until an update few weeks ago – I can't tell which one, though. So the problem is *not* related to some wrong, expired or missing certificates, but about something no longer working.
> there is no "Edit" button within the Certificate Manager in the People > register. So I'm wondering what you trying to do.This button is called "Edit CA Trust" and, as Thomas wrote, is accessible via the certificate manage -> Click "Persons" -> choose a person -> click "Edit Trust". Then a requester containing the button is displayed.
Now if you click this button, you'll get the said error message "Certificate for this certificate authority was not found", even if the certificate *is* installed and is valid, and S/MIME encryption for this person's certificate worked earlier.
> Please note that S/MIME is more or less broken by design and future > version of Thunderbird/Icedove maybe will not have S/MIME supportI agree with you that the hierarchical approach of S/MIME is an issue. But nevertheless it's widely used. So stating S/MIME as "who ever uses it, is a fool anyway." does neither help nor solve the problem.
-- Schönen Gruß Hartmut Goebel Dipl.-Informatiker (univ), CISSP, CSSLPInformation Security Management, Security Governance, Secure Software Development
Goebel Consult, Landshut http://www.goebel-consult.deBlog: http://www.goebel-consult.de/blog/fortbildung-iso-27001-lead-implementer Kolumne: http://www.cissp-gefluester.de/2012-04-compliance-bringt-keine-sicherheit
smime.p7s
Description: S/MIME Cryptographic Signature
