目 第１章 次 迷惑メールとは 迷惑 メールとは 1 迷惑メールの 迷惑 メールの現状 メールの 現状 第 １ 節 量的傾向 ································································ ································································· ································· １ 全体的傾向 ···························································· 12 ２ 国内発の迷惑メール ···················································· 14 ・Topics：迷惑メールによる影響 第 ２ 節 発信国の 発信国 の 特徴 ····························································· ····························································· １ 国内着の迷惑メールでの傾向 ············································ 16 ２ 世界全体での傾向 ······················································ 16 第 ３ 節 内容の 内容の 特徴 ······························································· ······························································· １ 国内着の迷惑メールでの傾向 ············································ 17 ・Topics：うっかりクリックに注意！ ・Topics：迷惑メールの例 第 ４ 節 送信手法の 送信手法 の 特徴 ··························································· ··························································· １ 送信者情報などの偽装 ·················································· 22 ２ ボットネット ·························································· 22 ３ 固定 IP アドレスを用いた送信 ··········································· 23 ４ 迷惑メールフィルターの回避 ············································ 23 第３章 次 第２章 目 第 １ 節 迷惑メール 迷惑 メールの メール の 定義 ·························································· ·························································· 2 １ 迷惑メールの問題 ······················································· 2 ２ 迷惑メールの特徴 ······················································· 2 ３ 法律の対象となる「迷惑メール」 ········································· 2 ４ このハンドブックで扱う迷惑メール ······································· 3 ５ SNS の迷惑メッセージ ··················································· 3 ・Topics：標的型サイバー攻撃、フィッシング詐欺、架空請求などで使われる 「なりすましメール」には、迷惑メール対策が有効です ・Topics：電子メールの仕組み 第 ２ 節 迷惑メールの 迷惑 メールの歴史 メールの 歴史 ·························································· ·························································· 8 １ 散発的な広告・宣伝メール ··············································· 8 ２ 迷惑メールの増加 ······················································· 8 ３ 国内発から海外発へ ····················································· 9 ・Topics：迷惑メールに関する裁判例 11 12 16 17 22 制度的な 制度的 な 対策 25 第 １ 節 法令による 法令 による制度的 による 制度的な 制度的 な 対策 ···················································· ···················································· 26 １ 特定電子メール法 ······················································ 27 ・Topics：特定電子メール法の沿革 ・Topics：現行の特定電子メール法の詳細 ２ 特定商取引法 ·························································· 35 ・Topics：特定商取引法による電子メール広告規制の沿革 ・Topics：現行の特定商取引法による電子メール広告規制の詳細 ３ その他の法律 ·························································· 41 第 ２ 節 迷惑メール 迷惑 メール関連法 メール 関連法の 関連法 の 執行状況 ················································ ················································ 42 １ 特定電子メール法の執行状況 ············································ 42 ２ 特定商取引に関する法律の執行状況（電子メール広告に関するもの） ········ 45 i 第４章 技術的な 技術的 な 対策 目 第 １ 節 概要 ································································ ····································································· ····································· １ 技術的な対策の概要 ···················································· 48 第 ２ 節 迷惑メール 迷惑 メール送信防止対策 メール 送信防止対策 ···················································· ···················································· １ MSA の踏み台対策について ·············································· 49 ２ パスワード漏洩防止対策 ················································ 51 ３ 転送メール対策 ························································ 53 第 ３ 節 迷惑メール 迷惑 メール受信防止対策 メール 受信防止対策 ···················································· ···················································· １ 実際のトラヒックを元にしたネットワークレベルの制限 ···················· 56 ２ ブラックリスト ························································ 56 ３ ドメイン（アドレス）の実在確認 ········································ 57 ４ フィルタリング ························································ 58 第 ４ 節 OP25B（ OP25B（ Outbound Port25 Blocking） Blocking） ········································· ········································· １ 概要 ·································································· 60 ・用語解説 ２ 導入の状況 ···························································· 63 ３ OP25B 導入後の課題 ···················································· 63 ・Topics：OP25B の効果 第 ５ 節 送信ドメイン 送信 ドメイン認証技術 ドメイン 認証技術································ 認証技術 ······················································· ······················································· １ 概要 ·································································· 67 ・Topics：エラーメール問題の仕組み ・用語解説 ・Topics：送信ドメイン認証での記載例 ２ 課題 ·································································· 73 ・Topics：DMARC ・Topics：フィードバックループ ・Topics：送信ドメイン認証技術の普及状況 ・Topics：送信ドメイン認証技術の企業・団体向け説明会等の実施 ・Topics：なりすまし防止「安心マーク」 次 第５章 第１節 １ ２ 第２節 １ ２ 第３節 １ ２ ３ ４ 第４節 １ ２ ３ ４ ５ ii 47 48 49 56 60 67 関係者による 関係者 による自主的 による 自主的な 自主的 な 取 り 組 み 携帯電話 携帯 電話事業者 電話 事業者の 事業者 の 取 り 組 み ·················································· ·················································· 迷惑メールの被害者を減少させるための対策 ······························ 84 自社の契約者が迷惑メールの送信者にならないための対策 ·················· 85 サービスプロバイダ サービス プロバイダー プロバイダ ー の 取 り 組 み ············································ ············································ 送信側での取り組み ···················································· 86 受信側での取り組み ···················································· 86 セキュリティベンダーの取 セキュリティベンダーの 取 り 組 み ············································ ············································ 迷惑メールの状況レポートの作成 ········································ 88 迷惑メール対策の新技術の開発と取り組み ································ 88 迷惑メール対策製品の性能向上 ·········································· 88 迷惑メールのフィードバック窓口 ········································ 88 配信サービス 配信 サービス事業者 サービス 事業者の 事業者 の 取 り 組 み ·············································· ·············································· 契約時の確認 ·························································· 89 送信リスト適正化のための機能の提供 ···································· 89 迷惑メールが送信された場合の対応 ······································ 89 技術的な対応 ·························································· 89 その他の措置 ·························································· 89 83 84 86 88 89 第６章 国際的な 国際的 な 取 り 組 み 91 １ 多国間での取り組み ···················································· 92 ２ 二国間等での取り組み ·················································· 93 ３ 最近の国際連携の動向 ·················································· 95 ・Topics：海外での迷惑メール対策法制の整備状況 第７章 １ ２ ３ ４ ５ 100 101 次 第８章 迷惑メール 迷惑 メール対策推進協議会 メール 対策推進協議会 ················································· ················································· 概要 ································································· 100 主な活動内容 ························································· 100 （ 一 財 ） 日本データ 日本 データ通信協会 データ 通信協会 迷惑メール 迷惑 メール相談 メール 相談センター 相談 センター ······················· 概要 ································································· 101 主な活動内容 ························································· 101 （ 一 財 ） 日本産業協会 電子商取引モニタリングセンター 電子商取引 モニタリングセンター ····················· 概要 ································································· 102 主な活動内容 ························································· 102 （ 一財） 一財 ） インターネット協会 インターネット 協会 迷惑メール 迷惑 メール対策委員会 メール 対策委員会 ························· 概要 ································································· 103 主な活動内容 ························································· 103 99 目 第１節 １ ２ 第２節 １ ２ 第３節 １ ２ 第４節 １ ２ 迷惑メール 迷惑 メール対策 組織等 における取 メール 対策に 対策 に 係 る 組織等における における 取 り 組 み 102 103 今後の 今後 の 取 り 組 み 105 10 5 制度的な対策 ························································· 106 技術的な対策 ························································· 106 国際連携の強化 ······················································· 106 自主的な取り組み ····················································· 106 周知活動 ····························································· 106 （ 参考１ 参考 １ ） 利用者が 利用者 が 注意すべきこと 注意 すべきこと ················································· ················································· （ 参考２ 参考 ２ ） メール送信 メール 送信側 送信 側 が 注意すべきこと 注意 すべきこと ··········································· ··········································· （ 参考３ 参考 ３ ） 用語集 ································································ ································································ （ 参考４ 参考 ４ ） 関連資料 ······························································ ······························································ 107 107 111 119 125 【 参考資料】 参考資料 】 ································································ ···································································· ···································· 131 １ 迷惑メール対策推進協議会設置要綱 ２ 迷惑メール追放宣言 ３ 迷惑メール対策推進協議会構成員 【 索引】 索引 】 ································································ ········································································ ········································ 137 iii MEMO
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