Sometimes (about every half year) there are new certificates from the server. This is because we haven’t made it that far in the CACert hierarchy yet.
We are only allowed to use our public certificates for half a year. Then they have to be updated. You can get more information by pressing the button “fingerprints” above.
When the certificates are updated, your browser should
- your browser should not show an error message anymore
- the mail client should not cause any problems either