Activating DKIM Management Avanan allows an unlimited number of DKIM entries to be defined. To activate DKIM Management for Avanan: Add all your selectors to the domain's DKIM Management page. See Adding New DKIM Selector to your Domain. If required, insert DNS NS records for your subdomains. Click Save & Update to activate the selectors. Once the selectors are activated, the system shows your Name Servers. Avanan verifies the updated DNS NS record and activates DKIM Management.