DMARC
メールのなりすましを防ぐいろいろのひとつ
SPF、 DKIMで失敗した場合の対処方法、レポート先などを指定できる。
RFC 9989 Domain-Based Message Authentication, Reporting, and Conformance (DMARC)
https://www.rfc-editor.org/rfc/rfc9989.html
RFC 9990 Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Aggregate Reporting
https://www.rfc-editor.org/rfc/rfc9990.html
RFC 9991 Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Failure Reporting
https://www.rfc-editor.org/rfc/rfc9991.html
旧
RFC 7489 Domain-based Message Authentication, Reporting, and Conformance (DMARC) (旧)
RFC 9091 Experimental Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Extension for Public Suffix Domains → 9989
https://www.rfc-editor.org/rfc/rfc9091.html
IAJapan 訳
https://salt.iajapan.org/wpmu/anti_spam/admin/tech/rfc/rfc7489/
https://support.google.com/a/topic/2759254?hl=ja
https://support.google.com/a/answer/10032169
RFC 8617 ARC (実験)