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How are DomainKeys Identified Mail (DKIM) and DomainKeys different?

DomainKeys Identified Mail (DKIM) and DomainKeys differ in several ways:

  • DKIM offers multiple signature algorithms, while DomainKeys only offers one.
  • DKIM has more options for canonicalization, which validates both header and body.
  • DKIM has the ability to delegate signing to third parties.
  • DKIM can self-sign the DKIM-Signature header field to protect against it being modified.
  • DKIM has the ability to support signature timeouts in Domain Name System (DNS).

DKIM is the newer version of DomainKeys.

DomainKeys is outdated and not relevant to Domain-based Message Authentication, Reporting, and Conformance (DMARC) implementations.

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