{"id":8970,"date":"2025-03-07T20:33:39","date_gmt":"2025-03-07T19:33:39","guid":{"rendered":"https:\/\/webhosting.de\/spf-dkim-dmarc-email-authentifizierung\/"},"modified":"2025-03-07T20:33:39","modified_gmt":"2025-03-07T19:33:39","slug":"spf-dkim-dmarc-%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e8%aa%8d%e8%a8%bc","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-email-authentifizierung\/","title":{"rendered":"SPF\u3001DKIM\u3001DMARC\uff1a\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e\u8aac\u660e"},"content":{"rendered":"<p><h2>\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\uff1a\u4e0d\u6b63\u884c\u70ba\u304b\u3089\u306e\u4fdd\u8b77\u3068\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5411\u4e0a<\/h2><\/p>\n<p>\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306f\u3001\u73fe\u4ee3\u306e\u30c7\u30b8\u30bf\u30eb\u30fb\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066\u6975\u3081\u3066\u91cd\u8981\u306a\u5074\u9762\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u304c\u5b9f\u969b\u306b\u6307\u5b9a\u3055\u308c\u305f\u9001\u4fe1\u8005\u304b\u3089\u767a\u4fe1\u3055\u308c\u3001\u8a50\u6b3a\u5e2b\u3084\u30b9\u30d1\u30de\u30fc\u306b\u3088\u3063\u3066\u6539\u3056\u3093\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u3053\u3053\u3067\u4e2d\u5fc3\u7684\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u306e\u304c\u3001SPF\uff08Sender Policy Framework\uff09\u3001DKIM\uff08DomainKeys Identified Mail\uff09\u3001DMARC\uff08Domain-based Message Authentication, Reporting and Conformance\uff09\u3068\u3044\u30463\u3064\u306e\u91cd\u8981\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u3001\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u304b\u3001\u305d\u3057\u3066\u306a\u305c\u305d\u308c\u3089\u304c\u30e1\u30fc\u30eb\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u4e0d\u53ef\u6b20\u306a\u306e\u304b\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<p><h2>SPF: \u30e1\u30fc\u30eb\u30c9\u30e1\u30a4\u30f3\u306e\u30b2\u30fc\u30c8\u30ad\u30fc\u30d1\u30fc<\/h2><\/p>\n<p>Sender Policy Framework (SPF)\u306f\u3001\u30e1\u30fc\u30eb\u30c9\u30e1\u30a4\u30f3\u306e\u30b2\u30fc\u30c8\u30ad\u30fc\u30d1\u30fc\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\u3069\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u6a29\u9650\u3092\u6301\u3064\u304b\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002SPF\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u57fa\u672c\u7684\u306b\u627f\u8a8d\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u3068\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30ea\u30b9\u30c8\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><h3>SPF\u306e\u4ed5\u7d44\u307f<\/h3><\/p>\n<ul>\n<li><strong>SPF\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u8a2d\u5b9a<\/strong> \u30c9\u30e1\u30a4\u30f3\u306eDNS\u8a2d\u5b9a\u3067SPF\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u516c\u958b\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u308b\u691c\u8a3c\uff1a<\/strong> \u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u4fe1\u3059\u308b\u3068\u3001SPF\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002<\/li>\n<li><strong>IP\u30a2\u30c9\u30ec\u30b9\u306e\u691c\u8a3c\uff1a<\/strong> \u9001\u4fe1\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u8a8d\u8a3c\u3055\u308c\u305f\u30a2\u30c9\u30ec\u30b9\u306e\u3044\u305a\u308c\u304b\u3068\u4e00\u81f4\u3059\u308c\u3070\u3001\u30e1\u30fc\u30eb\u306fSPF\u30c1\u30a7\u30c3\u30af\u3092\u901a\u904e\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u5178\u578b\u7684\u306aSPF\u30a8\u30f3\u30c8\u30ea\u30fc\u306f\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u3060\uff1a<\/p>\n<p>v=spf1 ip4:192.0.2.0\/24 include:_spf.example.com -all<\/p>\n<p>\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u306f\u3001192.0.2.0\/24\u306e\u7bc4\u56f2\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068example.com\u306eSPF\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u30ea\u30b9\u30c8\u3055\u308c\u3066\u3044\u308b\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u8ff0\u3079\u3066\u3044\u307e\u3059\u3002\u672b\u5c3e\u306e-all\u306f\u3001\u4ed6\u306e\u3059\u3079\u3066\u306e\u9001\u4fe1\u5143\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3002<\/p>\n<p><h2>DKIM: \u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u30c7\u30b8\u30bf\u30eb\u7f72\u540d<\/h2><\/p>\n<p>DomainKeys Identified Mail (DKIM)\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u306b\u30c7\u30b8\u30bf\u30eb\u7f72\u540d\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u3053\u306e\u7f72\u540d\u306f\u3001\u30e1\u30fc\u30eb\u304c\u5b9f\u969b\u306b\u304a\u5ba2\u69d8\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u9001\u4fe1\u3055\u308c\u3001\u9001\u4fe1\u4e2d\u306b\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p><h3>DKIM\u306e\u4ed5\u7d44\u307f<\/h3><\/p>\n<ul>\n<li><strong>\u9375\u30da\u30a2\u306e\u751f\u6210\uff1a<\/strong> \u79d8\u5bc6\u9375\u3068\u516c\u958b\u9375\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<li><strong>\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u7f72\u540d\uff1a<\/strong> \u79d8\u5bc6\u9375\u306f\u96fb\u5b50\u30e1\u30fc\u30eb\u30fb\u30b5\u30fc\u30d0\u30fc\u306b\u4fdd\u5b58\u3055\u308c\u3001\u9001\u4fe1\u96fb\u5b50\u30e1\u30fc\u30eb\u306b\u7f72\u540d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002<\/li>\n<li><strong>\u516c\u958b\u9375\u306e\u516c\u958b\uff1a<\/strong> \u516c\u958b\u9375\u306f\u30c9\u30e1\u30a4\u30f3\u306eDNS\u8a2d\u5b9a\u3067\u516c\u958b\u3055\u308c\u308b\u3002<\/li>\n<li><strong>\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u308b\u691c\u8a3c\uff1a<\/strong> \u96fb\u5b50\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306f\u3001DKIM\u3067\u7f72\u540d\u3055\u308c\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u4fe1\u3059\u308b\u3068\u3001\u516c\u958b\u9375\u3092\u53d6\u5f97\u3057\u3066\u7f72\u540d\u3092\u691c\u8a3c\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>DNS\u8a2d\u5b9a\u306eDKIM\u30a8\u30f3\u30c8\u30ea\u30fc\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n<p>v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3QEKyU1fSma0axspqYK49aE...<\/p>\n<p><h3>DKIM\u306e\u5229\u70b9<\/h3><\/p>\n<ul>\n<li>\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u306a\u308a\u3059\u307e\u3057\u9632\u6b62\uff1a\u79d8\u5bc6\u9375\u306e\u6240\u6709\u8005\u306e\u307f\u304c\u6709\u52b9\u306a\u7f72\u540d\u3092\u4f5c\u6210\u3067\u304d\u308b\u3002<\/li>\n<li>\u96fb\u5b50\u30e1\u30fc\u30eb\u5185\u5bb9\u306e\u4fdd\u8b77\uff1a\u9001\u4fe1\u4e2d\u306b\u96fb\u5b50\u30e1\u30fc\u30eb\u306b\u5909\u66f4\u3092\u52a0\u3048\u308b\u3068\u3001\u7f72\u540d\u306f\u7121\u52b9\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>\u30c9\u30e1\u30a4\u30f3\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u5411\u4e0a\uff1a\u8a8d\u8a3c\u3055\u308c\u305f\u96fb\u5b50\u30e1\u30fc\u30eb\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u30d7\u30ed\u30d0\u30a4\u30c0\u304b\u3089\u3088\u308a\u4fe1\u983c\u3067\u304d\u308b\u3068\u8a55\u4fa1\u3055\u308c\u308b\u3002<\/li>\n<\/ul>\n<p><h2>DMARC: \u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e\u6307\u63ee\u8005<\/h2><\/p>\n<p>Domain-based Message Authentication, Reporting and Conformance (DMARC)\u306f\u3001SPF\u3068DKIM\u3092\u30d9\u30fc\u30b9\u306b\u3001\u5236\u5fa1\u3068\u5831\u544a\u306e\u30ec\u30a4\u30e4\u30fc\u3092\u8ffd\u52a0\u3057\u305f\u3082\u306e\u3067\u3059\u3002DMARC\u3067\u306f\u3001SPF\u307e\u305f\u306fDKIM\u306e\u30c1\u30a7\u30c3\u30af\u306b\u5931\u6557\u3057\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u53d7\u4fe1\u8005\u304c\u3069\u306e\u3088\u3046\u306b\u51e6\u7406\u3059\u3079\u304d\u304b\u306e\u30dd\u30ea\u30b7\u30fc\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><h3>DMARC\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u4f8b<\/h3><\/p>\n<p>v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc-reports@example.com<\/p>\n<p>\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u306f\u3053\u3046\u3042\u308b\uff1a<\/p>\n<ul>\n<li><strong>v=DMARC1\uff1a<\/strong> \u3053\u308c\u306f\u30d0\u30fc\u30b8\u30e7\u30f31\u306eDMARC\u30a8\u30f3\u30c8\u30ea\u30fc\u3067\u3042\u308b\u3002<\/li>\n<li><strong>p=\u9694\u96e2\uff1a<\/strong> \u8a8d\u8a3c\u306b\u5408\u683c\u3057\u306a\u3044\u30e1\u30fc\u30eb\u306f\u9694\u96e2\uff08\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306b\u79fb\u52d5\uff09\u3055\u308c\u308b\u3079\u304d\u3067\u3059\u3002<\/li>\n<li><strong>pct=100\u3067\u3042\u308b\uff1a<\/strong> \u3053\u306e\u30dd\u30ea\u30b7\u30fc\u306f100%\u306e\u30e1\u30fc\u30eb\u306b\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>rua=mailto:dmarc-reports@example.com:<\/strong> \u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u5834\u5408\u306e\u5831\u544a\u306f\u3001\u3053\u306e\u96fb\u5b50\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306b\u9001\u3089\u308c\u308b\u3002<\/li>\n<\/ul>\n<p><h3>DMARC\u306e\u6a5f\u80fd<\/h3><\/p>\n<ul>\n<li><strong>\u30dd\u30ea\u30b7\u30fc\u306e\u5b9a\u7fa9<\/strong> \u8a8d\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u96fb\u5b50\u30e1\u30fc\u30eb\u3092\u62d2\u5426\u3059\u308b\u304b\u3001\u9694\u96e2\u3059\u308b\u304b\u3001\u307e\u305f\u306f\u3068\u306b\u304b\u304f\u914d\u4fe1\u3059\u308b\u304b\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u5831\u544a\u3059\u308b\uff1a<\/strong> \u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u30e1\u30fc\u30eb\u3092\u542b\u3081\u3001\u304a\u5ba2\u69d8\u306b\u4ee3\u308f\u3063\u3066\u9001\u4fe1\u3055\u308c\u305f\u30e1\u30fc\u30eb\u306e\u8a73\u7d30\u306a\u30ec\u30dd\u30fc\u30c8\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/strong> DMARC\u306f\u3001SPF\u304a\u3088\u3073DKIM\u3067\u4f7f\u7528\u3055\u308c\u308b\u30c9\u30e1\u30a4\u30f3\u304cFrom:\u30a2\u30c9\u30ec\u30b9\u3068\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n<\/ul>\n<p><h2>\u306a\u305cSPF\u3001DKIM\u3001DMARC\u304c\u91cd\u8981\u306a\u306e\u304b\uff1f<\/h2><\/p>\n<p>\u3053\u308c\u30893\u3064\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u5b9f\u88c5\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u6c7a\u5b9a\u7684\u306a\u5229\u70b9\u304c\u3042\u308b\uff1a<\/p>\n<p><h3>1. \u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u6027\u306e\u5411\u4e0a<\/h3><\/p>\n<p>\u30e1\u30fc\u30eb\u30d7\u30ed\u30d0\u30a4\u30c0\u306f\u3001\u8a8d\u8a3c\u3055\u308c\u305f\u30e1\u30fc\u30eb\u306f\u3088\u308a\u4fe1\u983c\u3067\u304d\u308b\u3068\u8003\u3048\u3001\u3042\u306a\u305f\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0\u3067\u306f\u306a\u304f\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u5165\u308b\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n<p><h3>2. \u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u306a\u308a\u3059\u307e\u3057\u304b\u3089\u306e\u4fdd\u8b77<\/h3><\/p>\n<p>\u3053\u308c\u3089\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u3088\u308a\u3001\u8a50\u6b3a\u5e2b\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u30e1\u30fc\u30eb\u3092\u88c5\u3063\u3066\u507d\u9020\u3059\u308b\u3053\u3068\u304c\u975e\u5e38\u306b\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u88ab\u5bb3\u8005\u304c\u9a19\u3055\u308c\u3066\u6a5f\u5bc6\u60c5\u5831\u3092\u958b\u793a\u3057\u3066\u3057\u307e\u3046\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u653b\u6483\u306e\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><h3>3. \u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u5224\u304c\u4e0a\u304c\u308b<\/h3><\/p>\n<p>\u4e00\u8cab\u3057\u305f\u8a8d\u8a3c\u306f\u3001\u30e1\u30fc\u30eb\u30d7\u30ed\u30d0\u30a4\u30c0\u304b\u3089\u306e\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u5224\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002\u826f\u3044\u8a55\u5224\u306f\u3001\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u306b\u5bfe\u3059\u308b\u4fe1\u983c\u3092\u9ad8\u3081\u3001\u30d6\u30e9\u30f3\u30c9\u30a2\u30a4\u30c7\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u5f37\u5316\u3057\u307e\u3059\u3002<\/p>\n<p><h3>4. \u96fb\u5b50\u30e1\u30fc\u30eb\u30fb\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u95a2\u3059\u308b\u6d1e\u5bdf<\/h3><\/p>\n<p>DMARC\u30ec\u30dd\u30fc\u30c8\u306f\u3001\u6f5c\u5728\u7684\u306a\u8a50\u6b3a\u884c\u70ba\u3092\u542b\u3081\u3001\u8ab0\u304c\u304a\u5ba2\u69d8\u306b\u4ee3\u308f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3066\u3044\u308b\u304b\u306b\u3064\u3044\u3066\u306e\u8cb4\u91cd\u306a\u60c5\u5831\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6d1e\u5bdf\u306f\u3001\u30e1\u30fc\u30eb\u8a50\u6b3a\u306e\u7279\u5b9a\u3068\u5bfe\u7b56\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<p><h3>5. \u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u8981\u4ef6\u306e\u5c65\u884c<\/h3><\/p>\n<p>\u591a\u304f\u306e\u696d\u754c\u3084\u5730\u57df\u3067\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8981\u4ef6\u304c\u53b3\u3057\u304f\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002SPF\u3001DKIM\u3001DMARC\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u3089\u306e\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u8981\u4ef6\u3092\u6e80\u305f\u3057\u3001\u6cd5\u7684\u306a\u5f71\u97ff\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><h2>SPF\u3001DKIM\u3001DMARC\u306e\u5b9f\u88c5<\/h2><\/p>\n<p>\u3053\u308c\u3089\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u8a2d\u5b9a\u3059\u308b\u306b\u306f\u3001\u5c02\u9580\u7684\u306a\u77e5\u8b58\u3068\u30c9\u30e1\u30a4\u30f3\u306eDNS\u8a2d\u5b9a\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\u3067\u3059\u3002\u57fa\u672c\u7684\u306a\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<p><h3>1. SPF\u306e\u8a2d\u5b9a<\/h3><\/p>\n<ul>\n<li>DNS\u8a2d\u5b9a\u306bTXT\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<li>\u30c9\u30e1\u30a4\u30f3\u306e\u8a8d\u8a3c\u6e08\u307f\u30e1\u30fc\u30eb\u30bd\u30fc\u30b9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><h3>2. DKIM\u3092\u8a2d\u5b9a\u3059\u308b<\/h3><\/p>\n<ul>\n<li>DKIM\u9375\u30da\u30a2\uff08\u79d8\u5bc6\u9375\u3068\u516c\u958b\u9375\uff09\u3092\u751f\u6210\u3059\u308b\u3002<\/li>\n<li>\u516c\u958b\u9375\u3092TXT\u30a8\u30f3\u30c8\u30ea\u3068\u3057\u3066DNS\u8a2d\u5b9a\u306b\u8ffd\u52a0\u3059\u308b\u3002<\/li>\n<li>\u9001\u4fe1\u30e1\u30fc\u30eb\u306e\u7f72\u540d\u306b\u79d8\u5bc6\u9375\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u30fb\u30b5\u30fc\u30d0\u30fc\u3092\u8a2d\u5b9a\u3059\u308b\u3002<\/li>\n<\/ul>\n<p><h3>3. DMARC\u306e\u8a2d\u5b9a<\/h3><\/p>\n<ul>\n<li>DNS\u8a2d\u5b9a\u306bDMARC\u30a8\u30f3\u30c8\u30ea\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<li>DMARC\u30dd\u30ea\u30b7\u30fc\u3068\u30ec\u30dd\u30fc\u30c8\u8a2d\u5b9a\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><h3>4. \u30c6\u30b9\u30c8\u3068\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/h3><\/p>\n<ul>\n<li>MXToolbox\u3084DMARC Analyser\u306a\u3069\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>DMARC\u30ec\u30dd\u30fc\u30c8\u3092\u5b9a\u671f\u7684\u306b\u76e3\u8996\u3057\u3066\u554f\u984c\u3092\u7279\u5b9a\u3057\u3001\u8a2d\u5b9a\u3092\u6700\u9069\u5316\u3059\u308b\u3002<\/li>\n<\/ul>\n<p><h2>\u8ab2\u984c\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2><\/p>\n<p>\u3053\u308c\u3089\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u5b9f\u88c5\u306b\u306f\u591a\u304f\u306e\u5229\u70b9\u304c\u3042\u308b\u304c\u3001\u8003\u616e\u3059\u3079\u304d\u8ab2\u984c\u3082\u3042\u308b\uff1a<\/p>\n<p><h3>1. \u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u8907\u96d1\u3055<\/h3><\/p>\n<p>\u7279\u306b\u591a\u304f\u306e\u30e1\u30fc\u30eb\u30bd\u30fc\u30b9\u3092\u6301\u3064\u5927\u898f\u6a21\u306a\u7d44\u7e54\u3067\u306f\u3001\u6b63\u3057\u3044\u8a2d\u5b9a\u306f\u8907\u96d1\u306a\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002DNS\u7ba1\u7406\u3068\u30e1\u30fc\u30eb\u30a4\u30f3\u30d5\u30e9\u3092\u5341\u5206\u306b\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><h3>2. \u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30fb\u30b5\u30fc\u30d3\u30b9\u306e\u7d71\u5408<\/h3><\/p>\n<p>\u304a\u5ba2\u69d8\u306b\u4ee3\u308f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u30b5\u30fc\u30d3\u30b9\uff08\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30c4\u30fc\u30eb\u3084CRM\u30b7\u30b9\u30c6\u30e0\u306a\u3069\uff09\u3092\u3054\u5229\u7528\u306e\u5834\u5408\u306f\u3001SPF\u3068DKIM\u306e\u8a2d\u5b9a\u306b\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u304c\u8aa4\u3063\u3066\u30d6\u30ed\u30c3\u30af\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><h3>3. \u8a2d\u5b9a\u30df\u30b9\u306e\u56de\u907f<\/h3><\/p>\n<p>\u8a2d\u5b9a\u3092\u8aa4\u308b\u3068\u3001\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u304c\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u308a\u3001\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002DNS\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u6ce8\u610f\u6df1\u304f\u30c1\u30a7\u30c3\u30af\u3057\u3001\u5b9a\u671f\u7684\u306b\u76e3\u8996\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3042\u308b\u3002<\/p>\n<p><h3>4. \u7d99\u7d9a\u7684\u306a\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9<\/h3><\/p>\n<p>E\u30e1\u30fc\u30eb\u306e\u30a4\u30f3\u30d5\u30e9\u306f\u6642\u9593\u306e\u7d4c\u904e\u3068\u3068\u3082\u306b\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u8a2d\u5b9a\u306e\u8abf\u6574\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5b9a\u671f\u7684\u306a\u30c1\u30a7\u30c3\u30af\u3068\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<p><h2>\u5c0e\u5165\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2><\/p>\n<p>SPF\u3001DKIM\u3001DMARC\u306e\u5b9f\u88c5\u3092\u6210\u529f\u3055\u305b\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u5b88\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u30b9\u30c6\u30c3\u30d7\u30fb\u30d0\u30a4\u30fb\u30b9\u30c6\u30c3\u30d7\u3067\u7d39\u4ecb\uff1a<\/strong> \u307e\u305a\u306f\u5bdb\u5bb9\u306aDMARC\u30dd\u30ea\u30b7\u30fc(p=none)\u304b\u3089\u59cb\u3081\u3001\u30e1\u30fc\u30eb\u306e\u8a8d\u8a3c\u306b\u81ea\u4fe1\u304c\u3064\u3044\u3066\u304d\u305f\u3089\u5f90\u3005\u306b\u53b3\u3057\u304f\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/li>\n<li><strong>\u5b9a\u671f\u7684\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\uff1a<\/strong> DMARC\u30ec\u30dd\u30fc\u30c8\u3092\u5b9a\u671f\u7684\u306b\u76e3\u8996\u3057\u3001\u554f\u984c\u3092\u65e9\u671f\u306b\u767a\u898b\u30fb\u89e3\u6c7a\u3059\u308b\u3002<\/li>\n<li><strong>DNS\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u6700\u65b0\u6027\uff1a<\/strong> SPF\u3001DKIM\u3001DMARC\u30ec\u30b3\u30fc\u30c9\u306f\u5e38\u306b\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\u307e\u3057\u3087\u3046\u3002<\/li>\n<li><strong>IT\u30c1\u30fc\u30e0\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0<\/strong> \u3053\u308c\u3089\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u7ba1\u7406\u30fb\u76e3\u8996\u3057\u3001\u4e00\u8cab\u6027\u306e\u3042\u308b\u6b63\u3057\u3044\u5b9f\u88c5\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u3001IT\u30c1\u30fc\u30e0\u3092\u8a13\u7df4\u3059\u308b\u3002<\/li>\n<li><strong>\u8a8d\u8a3c\u30c4\u30fc\u30eb\u306e\u4f7f\u7528\uff1a<\/strong> SPF\u3001DKIM\u3001DMARC\u306e\u8a2d\u5b9a\u3068\u76e3\u8996\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u5c02\u7528\u306e\u30c4\u30fc\u30eb\u3084\u30b5\u30fc\u30d3\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<\/ul>\n<p><h2>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306e\u5f37\u5316<\/h2><\/p>\n<p>SPF\u3001DKIM\u3001DMARC\u306e\u4ed6\u306b\u3082\u3001\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u306b\u5f79\u7acb\u3064\u5bfe\u7b56\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<p><h3>1. \u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30fb\u30ec\u30a4\u30e4\u30fc\u30fb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff08TLS\uff09<\/h3><\/p>\n<p>TLS\u306f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u9593\u306e\u63a5\u7d9a\u3092\u6697\u53f7\u5316\u3057\u3001\u9001\u4fe1\u4e2d\u306b\u30e1\u30fc\u30eb\u304c\u508d\u53d7\u3055\u308c\u305f\u308a\u6539\u3056\u3093\u3055\u308c\u305f\u308a\u3059\u308b\u30ea\u30b9\u30af\u3092\u4f4e\u6e1b\u3057\u307e\u3059\u3002<\/p>\n<p><h3>2. 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