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DKIM Fail — a DKIM verification result showing that a signature did not validate, such as because of altered signed content, a wrong key, or a malformed signature.
DKIM adds a digital signature to email. The sender protects the private key and publishes the public key in DNS under a selector. Validation shows that signed headers and body content were not changed after signing; it does not establish that the message is truthful.
DKIM Fail — a DKIM verification result showing that a signature did not validate, such as because of altered signed content, a wrong key, or a malformed signature.
The receiver reads the d= domain and s= selector from DKIM-Signature, retrieves the public key from DNS, and verifies the body hash and signature over the selected headers.
Protect the private key, use an adequate key size, rotate keys without interrupting delivery, and retain an old DNS key while messages signed with its selector may still be verified.
