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Regarding DKIM, Cloudflare recommends[1] a record of "v=DKIM1; p=", whereas this recommends deleting all "_domainkey" records. Is there a difference? [1] https

• zinekeller 4y ago
  "v=DKIM1; p=" is a perfectly valid DKIM record. It simply tells that the key has been revoked and you should no longer trust new emails signed with previous keys. The practical effects should be similar, although maybe there's a non-compliant server that retroactively revokes older emails (this should not happen, but I can only speculate).