Hello Thomas, another way this problem show up:
When composing a message, select S/MIME -> Security information. Here the receivers of the message will be listed as "not found", even if the certificate *is* existing and valid.
-- 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

