If you receive any signed emails from Carl Zeiss AG where the signature cannot be verified, please check the following points:
- Your email program must be able to recognize the Carl Zeiss AG root certificate and the Secure Email certificate and must trust them as issuers of email certificates. You can download both certificates from
 Certificates; the trust setting has to be made by you in your email program.
- Your program may require the certificate revocation lists (CRLs) of both CAs, i.e. the current information on revoked certificates of Carl Zeiss AG.
- If you are unable to send encrypted emails to a specific employee of Carl Zeiss AG, you probably do not have the digital certificate of this person.
- As a S/MIME user, ask your communication partner at Carl Zeiss AG to send you a signed email; this email will contain the certificate. Many email programs extract and save the certificate automatically, while some programs have to be prompted to do so via a specific function.
- As a PGP user, please request the public PGP key of your communication partner at Carl Zeiss AG and import it to your PGP keyring.
- Check that the signed email received from Carl Zeiss AG could be verified. Otherwise, proceed as described in the previous paragraph. Only then will the import of certificates work properly
Should further questions arise, please contact your IT support. Further information is available from your certification department as well.
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