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How to Diagnose DKIM Failures After an NS Migration

📝 Originally published (in Japanese) at forge.workstyle.tech . TL;DR After an NS migration, mail was delivered but DKIM failed four days later. SPF passed, and the DMARC policy was p=none .

  • DKIM failed after nameserver migration despite passing SPF
  • Missing DKIM TXT record in new DNS caused issue
  • Comparing DNS records revealed missing record

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