Table: Methods of adding a certificate authority-signed certificate
Submit a certificate signing request that you generated on the Add Certificate page to a certificate authority. When you receive the certificate back from the certificate authority, save it locally and import it to the Control Center to add it to the list of available certificates.
Update an existing TLS & HTTPS certificate authority-signed certificate with a new certificate that differs only in dates of validity. To do this, import the updated certificate into the Control Center, leaving the previous certificate in place.
In order to ensure that a certificate authority-signed certificate is accepted as valid, make sure that the CA certificate for the certificate authority that signed the certificate appears in the CA Certificates list on the Certificate Authority tab of the Certificate Settings page.
Another reason to add a certificate authority certificate is if your TLS and HTTP certificate requires an intermediate certificate authority certificate. When you add a certificate authority-signed certificate, you complete the certificate chain to permit authentication of the new certificate. All of your configured Scanners can access the certificate authority-signed certificates in the Control Center for SMTP/TLS and HTTPS authentication.