What is the role of SPF and DKIM in email marketing?

• A. They measure click-through rates.
• B. They can replace the need for consent.
• C. They are used to host emails.
• D. SPF and DKIM authenticate emails to verify sender and protect deliverability.

Answer: (D)

SPF and DKIM are mechanisms that authenticate email to prove it's really from the claimed sender and hasn’t been tampered with in transit. SPF (Sender Policy Framework) checks that the sending server is authorized by the domain owner. When an email arrives, the receiving server looks up the domain’s SPF record and verifies that the sending IP is allowed to send on behalf of that domain. DKIM (DomainKeys Identified Mail) uses a digital signature created with a private key by the sending server; the corresponding public key is published in DNS, so the recipient can verify the signature and confirm that the message content hasn’t been altered and that the domain authorizes the email. Together, these mechanisms build trust with mailbox providers and improve deliverability by reducing spoofing and increasing the likelihood that legitimate messages reach the inbox. They do not measure click-through rates, cannot replace consent requirements, and do not host emails, which is why those options aren’t correct.