---
title: "ドメイン認証チェッカー | DMARC Report"
description: "任意のドメインのSPF、DMARC、BIMI、MTA-STS、TLS-RPTレコードを確認します。DMARC Reportによる無料のメール認証監査ツールです。"
image: "https://dmarcreport.com/images/og-default.png"
canonical: "https://dmarcreport.com/ja/tools/domain-auth-checker/"
---

## メール認証プロトコルを理解する

### SPF (Sender Policy Framework)

SPFは、お使いのドメインのメールを送信することが認可されているメールサーバーを指定します。承認されたIPアドレスとホスト名を列挙したDNS TXTレコードを公開することで機能します。受信サーバーはこのレコードをチェックし、受信メールが認可された送信元から来ていることを確認します。

### DMARC (Domain-based Message Authentication)

DMARCはSPFとDKIMを結び付け、どちらの認証方法も合格しなかったときに受信メールサーバーが何をすべきか（メッセージを拒否、隔離、または許可する）を指示します。また、集計レポートとフォレンジックレポートを可能にし、ドメイン所有者が認証結果を監視できるようにします。各レイヤーを当社の[DMARCチェッカー](/ja/tools/dmarc-checker/)、[SPFチェッカー](/ja/tools/spf-checker/)、[DKIM検索](/ja/tools/dkim-lookup/)で確認してください。

### BIMI (Brand Indicators for Message Identification)

BIMIは、対応するメールクライアントにおいて、認証されたメールの横にブランドロゴを表示できるようにします。有効なDMARCポリシー（quarantineまたはreject）と、GmailおよびApple Mailでのロゴ表示のためのオプションのVerified Mark Certificate（VMC）が必要です。

### MTA-STS (Mail Transfer Agent Strict Transport Security)

MTA-STSは、お使いのドメインがメール配信にTLS暗号化を要求することを送信メールサーバーに伝えます。暗号化された接続を義務付けるDNSレコードとポリシーファイルを公開することで、ダウングレード攻撃や中間者による傍受を防ぎます。

### TLS-RPT (TLS Reporting)

TLS-RPTは、受信メールサーバーがTLS接続の失敗をあなたに報告できるようにします。MTA-STSと組み合わせることで、証明書エラー、期限切れの証明書、または誤って構成された暗号化によって生じる配信の問題を可視化します。

## なぜ5つのプロトコルすべてが重要なのか

### なりすまし対策

SPF + DMARCは、認可されていない送信者がお使いのドメインになりすますのを防ぎます。

### 暗号化

MTA-STS + TLS-RPTは、メールが転送中に暗号化されることを保証し、失敗を報告します。

### ブランドへの信頼

BIMIは受信トレイにお使いのロゴを表示し、受信者の信頼と開封率を高めます。

## メール認証の修正にお困りですか？

DMARC Reportは、お使いのすべてのドメインでSPF、DKIM、DMARCを監視し、何を修正すべきかを正確に示します。設定は60秒で完了します。

[無料トライアルを開始](https://app.dmarcreport.com/signup?plan=free)

## 世界中のドメインを保護しています

![G2 Leader - DMARC](https://media.mailhop.org/dmarcreport/images/g2-badges/DMARC_Leader_Leader.png)

Rated 4.8/5 on G2 · 469 verified reviews

![G2 Momentum Leader - DMARC](https://media.mailhop.org/dmarcreport/images/g2-badges/DMARC_MomentumLeader_Leader.png)

VU

Verified User in Information Technology and Services

5/5

### "Best security tool for your own domains"

The weekly reports help me a lot to analyze quickly the emails sent from my domains and that gives me peace of mind.

8/31/2022Verified on G2

RC

Ryan C.

Director

4.5/5

### "Control Centre for Email Security"

I like that we can see and check all reports on just 1 platform. We manage multiple domains, and monitoring them all in one place is essential.

8/29/2022Verified on G2

eg

eddy g.

Director

4.5/5

### "A great solution to a common email problem."

I have been using them for the last month after my Google business email started giving DMARC errors. I didn't even know what it meant at that time. After a little googling I found that people can spoof it as well. So far so good — the best thing is it protects every email.

8/29/2022Verified on G2

[Read all 469 reviews on G2 →](https://www.g2.com/products/dmarc-report/reviews)

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