A company wants to enhance its email security to prevent spoofing. The company implements a system that adds a digital signature to the header of every outgoing email. This signature is linked to the company's domain and can be verified by recipient mail servers using a public key published in the company's DNS records. Which email authentication technology did the company implement?
DomainKeys Identified Mail (DKIM) allows a sender to associate a domain name with an email message by affixing a digital signature to it. This signature is created using a private key and can be verified by the recipient's mail server using the corresponding public key, which is published in the sender's DNS records. This process ensures the email's authenticity and that it has not been tampered with in transit. Sender Policy Framework (SPF) is an alternative authentication method, but it only verifies that an email came from an authorized IP address, without using cryptographic signatures. Secure Sockets Layer (SSL) is a protocol for creating encrypted connections between a client and a server, not for authenticating email messages themselves. Post Office Protocol 3 (POP3) is a protocol used by email clients to retrieve mail from a server.
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