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<!doctype html>
<!--
Copyright 2026 ToppyMicroServices OU
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html lang="ja" data-resolver-mode="manual">
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; base-uri 'none'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self'; script-src-attr 'none'; style-src 'self' 'unsafe-inline'; font-src 'self'; img-src 'self' https: data:; connect-src 'self' https:;">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#0d1b2a">
<title>DMARC Checker / SPF・DKIM・BIMI 診断 | DMARC4all</title>
<meta name="description" content="Free browser-based DMARC checker and SPF/DKIM/BIMI audit. Check public DNS, review email authentication posture, and copy ready-to-use DNS fixes.">
<meta name="robots" content="index,follow,max-image-preview:large">
<link rel="canonical" href="https://dmarc4all.toppymicros.com/">
<link rel="alternate" type="text/plain" href="https://dmarc4all.toppymicros.com/llms.txt" title="DMARC4all LLM index">
<meta property="og:type" content="website">
<meta property="og:site_name" content="DMARC4all">
<meta property="og:title" content="DMARC Checker / SPF・DKIM・BIMI 診断 | DMARC4all">
<meta property="og:description" content="Free browser-based DMARC checker and SPF/DKIM/BIMI audit with ready-to-copy remediation steps.">
<meta property="og:url" content="https://dmarc4all.toppymicros.com/">
<meta property="og:image" content="https://dmarc4all.toppymicros.com/apple-touch-icon.png">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="DMARC Checker / SPF・DKIM・BIMI 診断 | DMARC4all">
<meta name="twitter:description" content="Free browser-based DMARC checker and SPF/DKIM/BIMI audit with ready-to-copy remediation steps.">
<meta name="twitter:image" content="https://dmarc4all.toppymicros.com/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="180x180" href="apple-touch-icon.png">
<link rel="icon" href="favicon.ico">
<link rel="apple-touch-icon" sizes="180x180" href="apple-touch-icon.png">
<link rel="manifest" href="manifest.webmanifest?v=2">
<link rel="stylesheet" href="assets/fonts/fonts.css">
<link rel="stylesheet" href="styles.css?v=13">
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "WebApplication",
"name": "DMARC4all",
"url": "https://dmarc4all.toppymicros.com/",
"applicationCategory": "SecurityApplication",
"operatingSystem": "Any",
"isAccessibleForFree": true,
"description": "Free browser-based DMARC checker and SPF/DKIM/BIMI audit using public DNS by default, with optional public RDAP and HTTPS reference checks.",
"publisher": {
"@type": "Organization",
"name": "ToppyMicroServices",
"url": "https://dmarc4all.toppymicros.com/"
},
"offers": {
"@type": "Offer",
"price": "0",
"priceCurrency": "USD"
},
"featureList": [
"DMARC, SPF, DKIM, BIMI, DNSSEC, MTA-STS, and TLS-RPT checks",
"Browser-only public DNS diagnostics by default",
"Optional opt-in public RDAP and HTTPS reference checks",
"Copy-ready DNS remediation guidance"
]
}
</script>
<script defer src="vendor/dompurify.min.js"></script>
<script defer src="i18n/ja.js?v=21"></script>
<script defer src="i18n/en.js?v=21"></script>
<script defer src="i18n/es.js?v=21"></script>
<script defer src="i18n/de.js?v=21"></script>
<script defer src="i18n/ko.js?v=21"></script>
<script defer src="i18n/vi.js?v=21"></script>
<script defer src="i18n/th.js?v=21"></script>
<script defer src="i18n/km.js?v=21"></script>
<script defer src="i18n/my.js?v=21"></script>
<script defer src="i18n/id.js?v=21"></script>
<script defer src="i18n/et.js?v=21"></script>
<script defer src="i18n/zh.js?v=21"></script>
<script defer src="i18n/ru.js?v=21"></script>
<script defer src="i18n/bn.js?v=21"></script>
<script defer src="i18n/vi_extra.js?v=21"></script>
<script defer src="i18n/th_extra.js?v=21"></script>
<script defer src="i18n/km_extra.js?v=21"></script>
<script defer src="i18n/id_extra.js?v=21"></script>
<script defer src="i18n/et_extra.js?v=21"></script>
<script defer src="i18n/zh_extra.js?v=21"></script>
<script defer src="i18n/ru_extra.js?v=21"></script>
<script defer src="i18n/es_extra.js?v=21"></script>
<script defer src="i18n/de_extra.js?v=21"></script>
<script defer src="i18n/extra_tr_my.js?v=21"></script>
<script defer src="i18n/extra_tr_ko.js?v=21"></script>
<script defer src="i18n/ui_extra.js?v=21"></script>
<script defer src="i18n/bn_extra.js?v=1"></script>
<script type="module" src="app.js?v=21"></script>
</head>
<body>
<div class="shell">
<div class="brandbar" aria-label="ToppyMicroServices">
<img src="apple-touch-icon.png" alt="ToppyMicroServices">
<span class="brand-name">ToppyMicroServices</span>
<div class="brand-actions">
<a class="brand-tool-link" href="header_analyzer.html" data-i18n="tools.header">Header Analyzer</a>
<a class="brand-tool-link" href="authentication_graph.html" data-i18n="tools.authGraph">Auth Graph</a>
<nav class="lang-switch" aria-label="Language" data-i18n-aria-label="lang.label">
<button type="button" class="lang-btn" data-lang-choice="ja" title="日本語" aria-label="日本語">JA</button>
<button type="button" class="lang-btn" data-lang-choice="en" title="English" aria-label="English">EN</button>
<button type="button" class="lang-btn" data-lang-choice="es" title="Español" aria-label="Español">ES</button>
<button type="button" class="lang-btn" data-lang-choice="de" title="Deutsch" aria-label="Deutsch">DE</button>
<button type="button" class="lang-btn" data-lang-choice="ko" title="한국어" aria-label="한국어">KO</button>
<button type="button" class="lang-btn" data-lang-choice="vi" title="Tiếng Việt" aria-label="Tiếng Việt">VI</button>
<button type="button" class="lang-btn" data-lang-choice="th" title="ไทย" aria-label="ไทย">TH</button>
<button type="button" class="lang-btn" data-lang-choice="km" title="ភាសាខ្មែរ" aria-label="ភាសាខ្មែរ">KM</button>
<button type="button" class="lang-btn" data-lang-choice="my" title="မြန်မာ" aria-label="မြန်မာ">MY</button>
<button type="button" class="lang-btn" data-lang-choice="id" title="Bahasa Indonesia" aria-label="Bahasa Indonesia">ID</button>
<button type="button" class="lang-btn" data-lang-choice="et" title="Eesti" aria-label="Eesti">ET</button>
<button type="button" class="lang-btn" data-lang-choice="zh" title="中文" aria-label="中文">ZH</button>
<button type="button" class="lang-btn" data-lang-choice="ru" title="Русский" aria-label="Русский">RU</button>
<button type="button" class="lang-btn" data-lang-choice="bn" title="বাংলা" aria-label="বাংলা">BN</button>
</nav>
<a class="brand-github" href="https://github.com/ToppyMicroServices/DMARC4all" target="_blank" rel="noopener" aria-label="GitHub">
<svg class="brand-github-icon" viewBox="0 0 16 16" aria-hidden="true">
<path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.01 8.01 0 0 0 16 8c0-4.42-3.58-8-8-8Z" />
</svg>
</a>
</div>
</div>
<main>
<section class="hero">
<div class="hero-grid z-1">
<div class="hero-copy">
<p class="pill" data-i18n="hero.pill">DNSクイック診断</p>
<div class="hero-heading">
<h1 data-i18n="hero.title">公開DNSでメール対策を診断</h1>
</div>
<div class="hero-badges">
<span class="hero-badge" data-i18n="hero.free">完全無料（登録不要）</span>
<span class="hero-badge" data-i18n="hero.badge.auth">SPF / DKIM / DMARC / BIMI</span>
<span class="hero-badge" data-i18n="hero.badge.transport">DNSSEC / MTA-STS / TLS-RPT</span>
</div>
<div class="hero-proof-grid">
<article class="proof-card">
<p class="proof-copy" data-i18n="form.note">既定では公開DNSのみを確認します。任意の外部チェックを有効にすると、公開RDAP・HTTPSへ接続します。メールの送受信は行いません。</p>
</article>
<article class="proof-card">
<p class="proof-copy" data-i18n="form.privacyFirst">※プライバシー優先: Resolver（DoH）のCustomで自前のDoH URLを指定できます.</p>
</article>
<article class="proof-card">
<p class="proof-copy" data-i18n="form.disclaimer">結果は目安です。必要に応じてメールヘッダで確認してください。</p>
</article>
</div>
<p class="hero-prs tiny muted mt-10" data-i18n-html="hero.prs.html">PRs for typos are welcome on <a href="https://github.com/ToppyMicroServices/DMARC4all" target="_blank" rel="noopener">GitHub</a>.</p>
</div>
<div class="hero-panel">
<div class="card form-card">
<div class="form-card-header">
<div>
<h2 class="m-0-0-6" data-i18n="form.title">Quick 診断</h2>
</div>
</div>
<form id="quick-check-form">
<div>
<label for="domain" data-i18n="form.domain">ドメイン</label>
<input id="domain" name="domain" placeholder="example.com" required>
</div>
<div class="form-option-group">
<label class="flex-label">
<input type="checkbox" id="consent" required checked class="w-auto"> <span data-i18n="form.consent">公開DNS（誰でも閲覧可能な範囲）の確認に同意する</span>
</label>
</div>
<details class="advanced-options">
<summary data-i18n="form.advancedSettings">詳細設定</summary>
<div class="advanced-options-body">
<div class="form-option-group">
<label class="flex-label">
<input type="checkbox" id="subdomain-scan" class="w-auto"> <span data-i18n="form.subdomain">サブドメイン探索も実行する（任意）</span>
</label>
<label class="flex-label">
<input type="checkbox" id="dnsbl-check" class="w-auto"> <span data-i18n="form.dnsbl">DNSBLチェックも実行する（任意: 時間がかかります）</span>
</label>
<label class="flex-label">
<input type="checkbox" id="external-probes" class="w-auto" disabled> <span data-i18n="form.externalProbes">公開RDAP・HTTPSも確認する（任意：rdap.org と転送先のレジストリRDAP、対象ドメイン、BIMI URLへ接続）</span>
</label>
</div>
<div class="resolver-panel">
<div class="resolver-panel-head">
<label for="resolver-select" data-i18n="form.resolver">Resolver (DoH)</label>
<span class="resolver-mode-badge">DoH</span>
</div>
<div class="resolver-controls">
<div>
<select id="resolver-select">
<option value="cloudflare" data-i18n="form.resolver.cloudflare">Cloudflare</option>
<option value="quad9" data-i18n="form.resolver.quad9">Quad9</option>
<option value="google" data-i18n="form.resolver.google">Google</option>
<option value="custom" data-i18n="form.resolver.custom">Custom (URL)</option>
</select>
</div>
<div id="resolver-custom-wrap" class="hidden">
<label for="resolver-custom" data-i18n="form.resolver.customLabel">Custom DoH URL</label>
<input id="resolver-custom" data-i18n-placeholder="form.resolver.customPlaceholder" placeholder="https://example.com/dns-query">
<p class="tiny muted mt-6" data-i18n="form.resolver.customHint">自前のDoH（HTTPS）を指定できます</p>
</div>
</div>
<p class="tiny text-warn" id="resolver-error"></p>
</div>
</div>
</details>
<div class="grid">
<button type="submit" id="go-deep-btn" class="btn-gradient" data-i18n="form.deep" disabled>診断を実行</button>
</div>
<details class="form-notes">
<summary data-i18n="form.moreInfo">Usage notes & privacy</summary>
<p class="tiny" data-i18n="form.privacy">入力したドメイン名は選択したDoHリゾルバへ送信されます。任意の外部チェックを有効にした場合は、rdap.org と転送先のレジストリRDAP、確認対象ドメインの apex / www / mta-sts HTTPSホスト、BIMI URLにも接続します。個人情報は収集しません。</p>
<p class="tiny muted" id="resolver-note"></p>
<p class="tiny muted" data-i18n="form.subdomainNote">※サブドメイン探索(小規模)は管理下ドメイン, または明示許可のある範囲でのみ使用してください．</p>
</details>
<div class="rua-callout mt-10">
<p class="tiny muted">
<strong data-i18n="rua.link.label">RUA集約レポート（DMARC）:</strong>
<a href="rua_service.html" data-i18n="rua.link.spec">RUAサービス(無料)の紹介</a>
<span aria-hidden="true"> / </span>
<a href="rua_analyzer.html" data-i18n="tools.ruaAnalyzer">RUA Analyzer</a>
<span aria-hidden="true"> / </span>
<a href="authentication_graph.html" data-i18n="tools.authGraph">Authentication Graph</a>
</p>
<p class="tiny muted">
<a href="standards_privacy.html" data-i18n="links.standards">標準とプライバシー</a>
<span aria-hidden="true"> / </span>
<a href="dns_provider_guides.html" data-i18n="links.guides">DNS 事業者別ガイド</a>
<span aria-hidden="true"> / </span>
<a href="ai_usage.html" data-i18n="links.ai">AI・機械向けアクセス</a>
</p>
<details class="tiny muted">
<summary data-i18n-html="rua.example.summary.html">DMARCに <code>rua=</code> を追加する例（DMARC4all）</summary>
<pre class="tiny rua-code-block" data-i18n="rua.example.block">v=DMARC1のTXTに追加:
rua=mailto:example.com@dmarc4all.toppymicros.com</pre>
<p class="tiny muted mt-6" data-i18n-html="rua.example.note.html">※既存のDMARC設定（p= / sp= / adkim= / aspf= など）は維持したまま、<code>rua=</code> だけを追加（または更新）する。</p>
</details>
</div>
</form>
</div>
</div>
</div>
</section>
<section class="results-shell">
<div id="report" class="report report-root" aria-live="polite"></div>
</section>
</main>
</div>
</body>
</html>