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A systems administrator is working with clients to verify email-based services are performing properly. The administrator wants to have the email server digitally sign outbound emails using the organization's private key. Which of the following should the systems administrator configure?
Correct Answer: B
Comprehensive and Detailed Explanation: DomainKeys Identified Mail (DKIM) digitally signs outbound messages with the organization's private key, enabling recipients to verify integrity and authenticity using the corresponding public key in DNS. * SPF validates sending server IPs, not message integrity. * DMARC builds policy enforcement on top of SPF and DKIM results. * TLS secures the transport channel, not the message content itself.