G Professional Collaboration Engineer Practice Exam

The chosen answer focuses on DKIM, which stands for DomainKeys Identified Mail. This protocol is specifically designed to ensure the integrity and authenticity of email messages. DKIM works by enabling the sending mail server to attach a digital signature to outgoing emails, which is then linked to the domain from which the email is sent. This signature is verified by the receiving mail server by checking it against the public key published in the sender’s DNS records.

By validating the DKIM signature, the receiving server can authenticate that the email was indeed sent from the claimed domain and that the message was not altered during transit. This helps combat various forms of email spoofing and phishing attacks, reinforcing trust in the communication.

In contrast, other protocols like SMTP (Simple Mail Transfer Protocol), IMAP (Internet Message Access Protocol), and POP (Post Office Protocol) serve different purposes in the email infrastructure. SMTP is primarily used for sending emails, while IMAP and POP are used for retrieving and storing emails. None of these focus specifically on validating the integrity and authenticity of the content, which is a crucial aspect addressed by DKIM.