[1] ご使用ドメインからの未認証メールを制御する - Gmail ヘルプ ( (2013-10-04 01:36:35 +09:00 版)) https://support.google.com/mail/answer/2451690

[6] DMARC レコードの追加 - Google Workspace 管理者ヘルプ, 2024-03-21T08:03:42.000Z https://support.google.com/a/answer/2466563

[2] DMARC.org - Domain-based Message Authentication, Reporting and Conformance ( (2013-07-26 17:50:10 +09:00 版)) http://dmarc.org/

[3]

dmarc.org – Domain Message Authentication Reporting & Conformance ( (2016-05-31 20:43:31 +09:00)) https://dmarc.org/

DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication protocol. It builds on the widely deployed SPF and DKIM protocols, adding a reporting function that allows senders and receivers to improve and monitor protection of the domain from fraudulent email.

[4] RFC 7489 - Domain-based Message Authentication, Reporting, and Conformance (DMARC) ( (2016-05-31 06:53:47 +09:00)) https://tools.ietf.org/html/rfc7489

[5] カスタムメールドメイン | Stripe のドキュメント, 2024-03-21T07:42:19.000Z https://docs.stripe.com/payments/account/email-domain#sender-authentication