https://app.knowbase.one/vault/rfc/docid/7120
RFC6541: DomainKeys Identified Mail (DKIM) Authorized Third-Party Signatures
Internet Engineering Task Force (IETF) M. Kucherawy Request for Comments: 6541 Cloudmark, Inc. Category: Experimental February 2012 ISSN: 2070-1721 DomainKeys Identified Mail (DKIM) Authorized Third-Part...