Which of the following services checks whether the sender's IP address is associated with the sender's domain name when receiving email?

Question

Options

• ADKIM
• BMX
• CSPF
• DDMARC

• A
  5% (1)
• B
  5% (1)
• C
  91% (20)

Explanation

SPF (Sender Policy Framework) is a DNS-based email authentication mechanism. The receiving mail server queries the sending domain's DNS TXT record to retrieve the list of IP addresses that are authorized to send email on behalf of that domain. If the sending server's IP is not in that list, the email fails the SPF check. DKIM (A) uses cryptographic signatures embedded in the email headers to verify the message hasn't been tampered with - it does not check IP addresses. MX (B) is a DNS record type that identifies which mail server receives incoming mail for a domain. DMARC (D) is a policy layer built on top of SPF and DKIM that tells receiving servers what to do with messages that fail authentication, but it doesn't directly perform the IP-to-domain check itself.

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