DMARC(Domain-based Message Authentication, Reporting and Conformance, DMARC)
DMARC(Domain-based Message Authentication, Reporting and Conformance, DMARC)是以網域為基礎的「郵件驗證、報告與一致性」的驗證機制。他會在DNS記錄中設定一筆DMARC(TXT記錄)規則,並且配合SPF及DKIM這兩項設定,來確認郵件的真實性。當SPF及DKIM驗證失敗時,郵件伺服器會根據DMARC所定義的規則,決定針對該封郵件進行隔離(quarantine)、拒絕(reject)或正常遞送(none)等動作。