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Note: This is technical but essential.
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SPF (Sender Policy Framework): An ID card for your domain.
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DKIM (DomainKeys): An encryption key that proves no one tampered with the email in transit.
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DMARC: A policy that tells Gmail what to do if an email fails the first two tests (Reject it or Quarantine it).
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Teaching Point: Without setting these up in your DNS (Domain Name System), your emails will hit the spam folder.