Use the Configuration > System > Certificates page to manage certificates and certificate authorities. These are used by the Email Appliance to manage encryption for the Administrative User Interface, the End User Web Quarantine, DKIM, and Email Encryption.

To fully configure certificates, it may be necessary to first add or configure a trusted certificate authority.

DKIM Settings

DomainKeys Identified Mail (DKIM) is an authentication framework used to sign and validate a message based on the domain of the sender. To configure DKIM to cryptographically sign outgoing mail, specify a private RSA key (in ASCII armor) and a "selector" string. For domains that you want to sign mail for, you also need to publish the public portion of the RSA key along with the selector in the DNS for those domains.