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