Setting up mail for verifying the validity of the certificate
The electronic signature used and evaluated, it is necessary first to your computer to install root certificates of the certification authorities or individual programmes, if required, to perform the certificate trust settings. If the setting does not, is usually communicated to the user the information that the electronic signature could not be verified and is not trusted.
Installation of the certificates of the certification authorities PostSignum QCA in Windows
root certification authority PostSignum Root QCA 2: postsignum_qca2_root. cer
qualified certification authority PostSignum Qualified CA2: postsignum_qca2_sub. cer
root certification authority PostSignum Root QCA: postsignum_qca_root.CER
qualified certification authority PostSignum Qualified CA: postsignum_qca_sub.CRT cer.
All certificates can be downloaded to disk, and then double-click the file to open the Certificate Wizard and install it into your Windows System.
For more information about the authority PostSignum root certificates, please visit http://www.postsignum.cz/certifikaty_autorit.html
The trust setting in MS Outlook (Express)
If you are in PC installed root certificates of PostSignum Root QCA and PostSignum Qualified CA, it should be possible for signed e-mail in the programme without issue.
Trust settings in other mail clients
In the event that your mail client does not use the Windows certificate store, you must import the root certificates to the client, if appropriate, to express confidence in reporting about the signed e-mail.
