Mandatory Tags for DKIM Signatures

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Last updated 2018-08-16 (latest revision 2018-02-12)
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The DKIM protocol applies a cryptographic signature to an e-mail message. This specification extends DKIM to allow new signature tags that validators are required to evaluate. The first such tag specifies a second signature that must be present for a signature to be valid.


John Levine (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)