You can create a Self-Signed Certificate if you do not want to use any external Certificate Authority. Click the Generate Self-Signed button and the CommuniGate Pro Server creates a Self-Signed certificate for you: the Issuer will be same entity you have specified, and the entire Certificate will be signed using the Domain Private Key. When a Domain has a Self-Signed Certificate, client applications will warn users that the addressed server has presented a certificate "issued by an unknown authority". Users can "install" self-signed certificates to avoid these warnings.
When client applications receive a Certificate and its issuer is not included into their list of Trusted Authorities, the applications may display warnings or they may refuse to accept the Certificate.
Your users can "install" your Domain Certificates into their Trusted Authorities lists. Once installed, the Certificate becomes a "trusted" one. For some programs (such as Mac versions of Microsoft Outlook and Outlook Express) installing an "untrusted" Certificate is the only way to use that Certificate for secure communications.
To install a Domain Certificate, the user should use a browser application and open the login page of the WebUser Interface for the selected Domain. If the Domain has an enabled Certificate, the Secure Certificate link appears. The user should click on that link to download the Domain Certificate and "open" it. The browser should allow the user to verify the Certificate and to install it into the list of Trusted Authorities.
When a Domain has a Self-Signed Certificate, the Refresh Self-Signed button appears on the WebAdmin page. Click this button to create a new Self-Signed Certificate with the same serial number, but with a new validity period.