https://app.knowbase.one/vault/rfc/docid/359
RFC9091: Experimental Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Extension for Public Suffix Domains
Internet Engineering Task Force (IETF) S. Kitterman Request for Comments: 9091 fTLD Registry Services Category: Experimental T. Wicinski, Ed. ISSN: 2070-1721 July 2021 ...