Question: Which of the following is NOT a form of email authentication?
- SPF
- DKIM
- BIMI
- CPC
- DMARC
Explanation
CPC refers to cost-per-click, which is a performance or advertising metric, not a method for verifying email sender identity. HubSpot defines email authentication through domain-based setup that helps prove HubSpot has permission to send on behalf of a sending domain. SPF, DKIM, and DMARC are authentication mechanisms used in that setup. BIMI is related to authenticated email because it allows a verified brand logo to display only after required authentication policies are configured.
Why the other options are incorrect
SPF is incorrect because it is used to authorize HubSpot to send email on behalf of a domain.
DKIM is incorrect because it is used to authenticate a sending domain in HubSpot.
BIMI is incorrect because it is tied to authenticated email and verified brand logo display.
DMARC is incorrect because it tells receiving servers how to handle unauthenticated email from a domain.
Source for verification
https://knowledge.hubspot.com/marketing-email/understand-email-sending-in-hubspot
https://knowledge.hubspot.com/marketing-email/use-bimi-to-display-your-verified-brand-logo-in-emails
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