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Table of Contents
1. Introduction ....................................................3
2. Requirements ....................................................5
2.1. High-Level Goals ...........................................5
2.2. Out of Scope ...............................................6
2.3. Scalability ................................................6
2.4. Anti-Phishing ..............................................7
3. Terminology and Definitions .....................................7
3.1. Identifier Alignment .......................................8
3.2. Organizational Domain .....................................11
4. Overview .......................................................12
4.1. Authentication Mechanisms .................................12
4.2. Key Concepts ..............................................12
4.3. Flow Diagram ..............................................13
5. Use of RFC5322.From ............................................15
6. Policy .........................................................15
6.1. DMARC Policy Record .......................................16
6.2. DMARC URIs ................................................16
6.3. General Record Format .....................................17
6.4. Formal Definition .........................................21
6.5. Domain Owner Actions ......................................22
6.6. Mail Receiver Actions .....................................23
6.7. Policy Enforcement Considerations .........................27
7. DMARC Feedback .................................................28
7.1. Verifying External Destinations ...........................28
7.2. Aggregate Reports .........................................30
7.3. Failure Reports ...........................................36
8. Minimum Implementations ........................................37
9. Privacy Considerations .........................................38
9.1. Data Exposure Considerations ..............................38
9.2. Report Recipients .........................................39
目次
1. はじめに ........................................................3 2. 要件.............................................................5 2.1. 目標 .......................................................5 2.2. 範囲外 .....................................................6 2.3. スケーラビリティ ...........................................6 2.4. フィッシング対策 ...........................................7 3. 用語と定義 ......................................................7 3.1. 識別子アライメント .........................................8 3.2. 組織ドメイン ..............................................11 4. 概要 ...........................................................12 4.1. 認証メカニズム ............................................12 4.2. 主な概念 ..................................................12 4.3. フロー図 ..................................................13 5. RFC5322.Fromの使用 .............................................15 6. ポリシー .......................................................15 6.1. DMARCポリシーレコード .....................................16 6.2. DMARC URI .................................................16 6.3. レコードの一般フォーマット ................................17 6.4. フォーマット定義 ..........................................21 6.5. ドメイン所有者側の実装 ....................................22 6.6. メール受信者側の実装 ......................................23 6.7. ポリシー実施の際の検討事項 ................................27 7. DMARCのフィードバック ..........................................28 7.1. 外部送信先の検証 ..........................................28 7.2. 集約レポート ..............................................30 7.3. 失敗レポート ..............................................36 8. 必要最小限の実装 ...............................................37 9. プライバシーに対する検討事項 ...................................38 9.1. データ漏洩に対する検討事項 ................................38 9.2. レポート受信者 ............................................39
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