DomainKeys (informally DK) is a deprecated e-mail authentication system designed by Yahoo[1][2] to verify the DNS domain of an e-mail sender and the message integrity.

Aspects of DomainKeys, along with parts of Identified Internet Mail, were combined to create DomainKeys Identified Mail (DKIM),[2][3][4] which is now widely used.[5]

Both DomainKeys and DKIM were published in May 2007, DomainKeys as an "historical" protocol, and DKIM as its standards-track replacement.8

See also


  1. "May 19, 2004 Yahoo Releases Specs for DomainKeys"
  2. 1 2 Delany, Mark (May 22, 2007). "One small step for email, one giant leap for Internet safety". Yahoo! corporate blog. Delany is credited as Chief Architect, inventor of DomainKeys.
  3. RFC 4870 ("Domain-Based Email Authentication Using Public Keys Advertised in the DNS (DomainKeys)"; obsoleted by RFC 4871).
  4. RFC 6376 ("DomainKeys Identified Mail (DKIM) Signatures"; obsoletes RFC 4871 and RFC 5672).
  5. Jim Fenton (15 June 2009). "DomainKeys Identified Mail (DKIM) Grows Significantly". Cisco. Retrieved 28 October 2014.

External links

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