\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6fc0\u6e1b\u3057\u305f\u80cc\u666f\u3068\u3001\u3053\u308c\u304b\u3089\u306e\u653b\u6483\"\u8cea\"\u306e\u5909\u5316\u3092\u898b\u636e\u3048\u305f\u5bfe\u7b56<\/title>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Noto+Sans+JP:wght@400;500;700;900&display=swap\" rel=\"stylesheet\"\/>\n<style>\nbody {\n background-color: #f3f4f6;\n margin: 0;\n padding: 0;\n font-family: \"Noto Sans JP\", sans-serif;\n -webkit-font-smoothing: antialiased;\n}\n\n.web-container {\n background-color: #ffffff;\n max-width: 900px;\n margin: 0 auto;\n box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);\n min-height: 100vh;\n}\n\n.risk-report {\n font-family: \"Noto Sans JP\", sans-serif;\n line-height: 1.8;\n color: #333;\n padding: 20px;\n}\n\n.risk-report h1, .risk-report h2, .risk-report h3, .risk-report h4 {\n font-weight: 700;\n margin-top: 2.5em;\n}\n\n.risk-report h1 {\n font-size: 2rem;\n border-left: 6px solid #4F46E5;\n padding-left: 12px;\n margin-bottom: 1em;\n line-height: 1.4;\n color: #1e293b;\n}\n\n.risk-report h2 {\n font-size: 1.6rem;\n border-left: 5px solid #6366F1;\n padding-left: 10px;\n color: #1e293b;\n margin-bottom: 1em;\n}\n\n.risk-report h3 {\n font-size: 1.3rem;\n border-left: 4px solid #818CF8;\n padding-left: 8px;\n color: #334155;\n margin-bottom: 0.8em;\n}\n\n.risk-report h4 {\n font-size: 1.1rem;\n color: #475569;\n margin-top: 1.5em;\n margin-bottom: 0.5em;\n}\n\n.risk-report p {\n margin-bottom: 1.5em;\n}\n\n.risk-report ul, .risk-report ol {\n margin-left: 1.2em;\n padding-left: 0;\n}\n\n.risk-report li {\n margin-bottom: 0.4em;\n}\n\n.risk-report ul li {\n list-style-type: disc;\n}\n\n.risk-report strong {\n color: #4338CA;\n font-weight: 700;\n}\n\n.alert-box {\n background: #FEF2F2;\n border-left: 5px solid #DC2626;\n padding: 20px;\n margin: 2em 0;\n border-radius: 4px;\n}\n\n.info-box {\n background: #EFF6FF;\n border-left: 5px solid #3B82F6;\n padding: 20px;\n margin: 2em 0;\n border-radius: 4px;\n}\n\n.case-box {\n background: #F8FAFC;\n border-left: 5px solid #64748B;\n padding: 20px;\n margin: 2em 0;\n border-radius: 4px;\n}\n\n.checklist-box {\n background: #F0FDF4;\n border-left: 5px solid #10B981;\n padding: 20px;\n margin: 2em 0;\n border-radius: 4px;\n}\n\n.warning-box {\n background: #FEF3C7;\n border-left: 5px solid #F59E0B;\n padding: 20px;\n margin: 2em 0;\n border-radius: 4px;\n}\n\n.note-text {\n font-size: 0.9em;\n color: #666;\n text-align: right;\n margin-top: 1em;\n}\n\n.intro-section {\n background: #F9FAFB;\n padding: 20px;\n margin: 2em 0;\n border-radius: 8px;\n}\n\n.comparison-table {\n width: 100%;\n border-collapse: collapse;\n margin: 2em 0;\n}\n\n.comparison-table th,\n.comparison-table td {\n padding: 12px;\n text-align: left;\n border: 1px solid #E5E7EB;\n}\n\n.comparison-table th {\n background-color: #F3F4F6;\n font-weight: 700;\n color: #1e293b;\n}\n\n.comparison-table tr:nth-child(even) {\n background-color: #F9FAFB;\n}\n\n.stat-row {\n display: flex;\n gap: 16px;\n flex-wrap: wrap;\n margin: 2em 0;\n}\n\n.stat-card {\n flex: 1 1 160px;\n background: #EFF6FF;\n border: 1px solid #BFDBFE;\n border-radius: 8px;\n padding: 18px 16px;\n text-align: center;\n}\n\n.stat-card .num {\n font-size: 2.0rem;\n font-weight: 900;\n color: #1e40af;\n line-height: 1.1;\n}\n\n.stat-card .unit {\n font-size: 0.8rem;\n color: #3b82f6;\n margin-top: 4px;\n}\n\n.stat-card .label {\n font-size: 0.78rem;\n color: #475569;\n margin-top: 6px;\n}\n\n@media (max-width: 768px) {\n .risk-report h1 {\n font-size: 1.5rem;\n }\n .comparison-table {\n font-size: 0.9em;\n }\n .stat-card .num {\n font-size: 1.6rem;\n }\n}\n<\/style>\n<\/head>\n<body>\n<div class=\"web-container\">\n<article class=\"risk-report\">\n\n<p class=\"note-text\">\u30b5\u30a4\u30d0\u30fc\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u682a\u5f0f\u4f1a\u793e<br\/>\u203b\u672c\u53f7\u306fAI\u3067\u57f7\u7b46\u3057\u305f\u6587\u7ae0\u3092\u7b46\u8005\u304c\u76e3\u4fee\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h1>\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6fc0\u6e1b\u3057\u305f\u80cc\u666f\u3068\u3001<br\/>\u3053\u308c\u304b\u3089\u306e\u653b\u6483\"\u8cea\"\u306e\u5909\u5316\u3092\u898b\u636e\u3048\u305f\u5bfe\u7b56<\/h1>\n\n<div class=\"intro-section\">\n<p>\n\u4eca\u671d\u306f\u3001<br\/>\n<strong>\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\uff1d\u5b89\u5168\u306b\u306a\u3063\u305f\u3001\u3067\u306f\u306a\u3044\u300d<\/strong><br\/>\n\u3068\u3044\u3046\u3001\u73fe\u5728\u306e\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u672c\u8cea\u7684\u306a\u5909\u5316\u306b\u3064\u3044\u3066\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002\n<\/p>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u306a\u305c\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\u306e\u304b<\/h2>\n\n<p>\n2026\u5e741\u6708\u4ee5\u964d\u3001\u4e3b\u8981\u30e1\u30fc\u30eb\u30d7\u30ed\u30d0\u30a4\u30c0\u306e\u898f\u5236\u5f37\u5316\u304c\u672c\u683c\u5316\u3057\u305f\u3053\u3068\u3067\u3001\n\u591a\u304f\u306e\u4f01\u696d\u3067\u8ff7\u60d1\u30e1\u30fc\u30eb\u306e\u53d7\u4fe1\u6570\u304c\u5927\u5e45\u306b\u6e1b\u5c11\u3057\u3066\u3044\u307e\u3059\u3002\n\u898f\u5236\u5f37\u5316\u524d\u3068\u6bd4\u3079\u3001<strong>\u6570\u5206\u306e\u4e00\u306b\u307e\u3067\u6fc0\u6e1b\u3057\u305f<\/strong>\u3068\u3044\u3046\u5831\u544a\u3082\u73cd\u3057\u304f\u3042\u308a\u307e\u305b\u3093\u3002\n<\/p>\n\n<div class=\"info-box\">\n<p><strong>\ud83d\udccc \u306a\u305c\u6e1b\u3063\u305f\u306e\u304b<\/strong><\/p>\n<p>\nSPF\u30fbDKIM\u30fbDMARC\u306e\u8a8d\u8a3c\u3092\u30d1\u30b9\u3067\u304d\u306a\u3044\u5927\u91cf\u9001\u4fe1\u30e1\u30fc\u30eb\u306e\u591a\u304f\u304c\u3001\n\u53d7\u4fe1\u8005\u306b\u5c4a\u304f\u524d\u306b\u81ea\u52d5\u7684\u306b\u5f3e\u304b\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u305f\u3081\u3067\u3059\u3002<br\/>\n\u4ee5\u524d\u306f\u5927\u91cf\u306b\u5c4a\u3044\u3066\u3044\u305f\u7121\u5dee\u5225\u578b\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u3001\n\u30d7\u30ed\u30d0\u30a4\u30c0\u5074\u3067\u30d5\u30a3\u30eb\u30bf\u3055\u308c\u308b\u5272\u5408\u304c\u98db\u8e8d\u7684\u306b\u9ad8\u307e\u3063\u3066\u3044\u307e\u3059\u3002\n<\/p>\n<\/div>\n\n<p>\n\u3053\u306e\u6e1b\u5c11\u306e\u4e3b\u56e0\u306f\u3001<strong>\u4e3b\u8981\u30e1\u30fc\u30eb\u30d7\u30ed\u30d0\u30a4\u30c0\u304c\u76f8\u6b21\u3044\u3067\u9001\u4fe1\u30eb\u30fc\u30eb\u3092\u53b3\u683c\u5316\u3057\u305f<\/strong>\u3053\u3068\u3067\u3059\u3002<br\/>\nSPF\u30fbDKIM\u30fbDMARC\u306e\u8a8d\u8a3c\u3092\u30d1\u30b9\u3067\u304d\u306a\u3044\u5927\u91cf\u9001\u4fe1\u30e1\u30fc\u30eb\u306e\u591a\u304f\u304c\u3001\n\u53d7\u4fe1\u8005\u306b\u5c4a\u304f\u524d\u306b\u5f3e\u304b\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\n<\/p>\n\n<h3>\u3010\u4e3b\u8981\u30d7\u30ed\u30d0\u30a4\u30c0\u306e\u898f\u5236\u5f37\u5316\u3011<\/h3>\n\n<table class=\"comparison-table\">\n<thead>\n<tr>\n<th>\u30d7\u30ed\u30d0\u30a4\u30c0<\/th>\n<th>\u5f37\u5316\u6642\u671f<\/th>\n<th>\u4e3b\u306a\u5185\u5bb9<\/th>\n<th>\u5bfe\u8c61<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Yahoo! Japan<\/strong><\/td>\n<td>2024\u5e7412\u6708\u301c\u63a8\u5968\u958b\u59cb<br\/>2025\u5e74 \u6bb5\u968e\u7684\u7fa9\u52d9\u5316<\/td>\n<td>DMARC\u5bfe\u5fdc\u3092\u63a8\u5968\u5316\u2192\u672a\u5bfe\u5fdc\u30e1\u30fc\u30eb\u3092\u30b9\u30d1\u30e0\u6271\u3044\u3002<br\/>\u7c73\u56fdYahoo!\u306f2024\u5e742\u6708\u304b\u3089\u5927\u53e3\u9001\u4fe1\u8005\u3078\u306e\u7fa9\u52d9\u5316\u3092\u5148\u884c\u5b9f\u65bd\u3002<\/td>\n<td>\u5927\u91cf\u9001\u4fe1\u8005<\/td>\n<\/tr>\n<tr>\n<td><strong>Microsoft<br\/>\uff08Outlook\uff0fHotmail\uff09<\/strong><\/td>\n<td>2025\u5e745\u67085\u65e5\u301c<\/td>\n<td>SPF\u30fbDKIM\u30fbDMARC\u5bfe\u5fdc\u3092\u7fa9\u52d9\u4ed8\u3051\u3002<br\/>\u672a\u5bfe\u5fdc\u30e1\u30fc\u30eb\u306f\u30b8\u30e3\u30f3\u30af\u3078\u632f\u308a\u5206\u3051\u307e\u305f\u306f\u62d2\u5426\u3002<\/td>\n<td>1\u65e55,000\u901a\u8d85\u306e<br\/>\u5927\u91cf\u9001\u4fe1\u8005<\/td>\n<\/tr>\n<tr>\n<td><strong>Gmail\uff08Google\uff09<\/strong><\/td>\n<td>2025\u5e7411\u6708\u301c<br\/>\uff08\u5f37\u5316\u30d5\u30a7\u30fc\u30ba\uff09<\/td>\n<td>2024\u5e742\u6708\u306e\u7fa9\u52d9\u5316\u306b\u7d9a\u304d\u3001\u672a\u6e96\u62e0\u30d0\u30eb\u30af\u30e1\u30fc\u30eb\u3078\u306e<br\/>\u30da\u30ca\u30eb\u30c6\u30a3\u3092\u6bb5\u968e\u7684\u306b\u5f37\u5316\u3002\u9045\u5ef6\u30fb\u62d2\u5426\u306e\u5272\u5408\u3092\u62e1\u5927\u3002<\/td>\n<td>1\u65e55,000\u901a\u8d85\u306e<br\/>\u5927\u91cf\u9001\u4fe1\u8005<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<div class=\"case-box\">\n<p><strong>\ud83d\udccb Yahoo! Japan\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066<\/strong><\/p>\n<p>\n\u7c73\u56fdYahoo!\u304c\u5927\u53e3\u9001\u4fe1\u8005\u3078\u306eDMARC\u7fa9\u52d9\u5316\u30922024\u5e742\u6708\u304b\u3089\u958b\u59cb\u3057\u305f\u306e\u306b\u5bfe\u3057\u3001<br\/>\nYahoo! Japan\u306f2024\u5e7412\u6708\u306bDMARC\u5bfe\u5fdc\u3092\u300c\u63a8\u5968\u300d\u3068\u3057\u3066\u6848\u5185\u3057\u30012025\u5e74\u4ee5\u964d\u306b\u6bb5\u968e\u7684\u306a\u7fa9\u52d9\u5316\u3078\u79fb\u884c\u3057\u307e\u3057\u305f\u3002<br\/>\n\u300c4\u6708\u304b\u3089\u5f37\u5316\u300d\u3068\u3044\u3046\u4e00\u90e8\u5831\u9053\u306f\u7c73\u56fdYahoo!\u306e\u30d5\u30a7\u30fc\u30ba\u30a2\u30c3\u30d7\u3092\u6307\u3059\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3001<br\/>\n\u56fd\u5185\u5411\u3051\u767a\u4fe1\u3067\u306f\u300c2025\u5e74\u306b\u6bb5\u968e\u7684\u7fa9\u52d9\u5316\u300d\u3068\u8868\u73fe\u3059\u308b\u306e\u304c\u6b63\u78ba\u3067\u3059\u3002\n<\/p>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u300c\u91cf\u306e\u6e1b\u5c11\u300d\u304c\u793a\u3059\u3001\u65b0\u305f\u306a\u8105\u5a01\u69cb\u9020<\/h2>\n\n<p>\n\u5927\u91cf\u7121\u5dee\u5225\u578b\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u5f3e\u304b\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u534a\u9762\u3001<br\/>\n\u653b\u6483\u8005\u306f\u6226\u7565\u3092\u8ee2\u63db\u3057\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"warning-box\">\n<p><strong>\ud83d\udca1 \u653b\u6483\u306e\u8cea\u7684\u30b7\u30d5\u30c8<\/strong><\/p>\n<p>\n<strong>\u8a8d\u8a3c\u3092\u3059\u308a\u629c\u3051\u308b\u300c\u5c11\u6570\u30fb\u9ad8\u7cbe\u5ea6\u300d\u306e\u30bf\u30fc\u30b2\u30c3\u30c8\u578b\u653b\u6483\u306b\u30b7\u30d5\u30c8\u3057\u3066\u3044\u308b<\/strong>\u306e\u3067\u3059\u3002<br\/>\n\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\u300d\u306f\u300c\u653b\u6483\u304c\u6e1b\u3063\u305f\u300d\u3067\u306f\u306a\u304f\u3001<br\/>\n\u300c\u5927\u91cf\u9001\u4fe1\u578b\u304c\u6e1b\u308a\u3001\u898b\u7834\u308a\u306b\u304f\u3044\u653b\u6483\u304c\u5897\u3048\u305f\u300d\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\n<\/p>\n<\/div>\n\n<h3>\u3010\u5909\u5316\u2460 AI\u751f\u6210\u306b\u3088\u308b\"\u81ea\u7136\u306a\u6587\u7ae0\"\u306e\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3011<\/h3>\n\n<p>\n\u5f93\u6765\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u306f\u4e0d\u81ea\u7136\u306a\u65e5\u672c\u8a9e\u3084\u6a5f\u68b0\u7ffb\u8a33\u306e\u8de1\u304c\u898b\u7834\u308b\u624b\u304c\u304b\u308a\u3067\u3057\u305f\u3002<br\/>\n\u3057\u304b\u3057\u751f\u6210AI\u306e\u666e\u53ca\u306b\u3088\u308a\u3001\u6587\u6cd5\u7684\u306b\u5b8c\u74a7\u3067\u656c\u8a9e\u30fb\u696d\u754c\u7528\u8a9e\u3082\u6b63\u78ba\u306a\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30e1\u30fc\u30eb\u304c\n\u5bb9\u6613\u306b\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"alert-box\">\n<p><strong>\u26a0\ufe0f \u5909\u5316\u306e\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u300c\u65e5\u672c\u8a9e\u304c\u304a\u304b\u3057\u3044\u300d\u3068\u3044\u3046\u5224\u65ad\u57fa\u6e96\u304c\u3082\u306f\u3084\u901a\u7528\u3057\u306a\u3044<\/li>\n<li>\u9001\u4fe1\u8005\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6b63\u898f\u306b\u898b\u305b\u308b\u300c\u306a\u308a\u3059\u307e\u3057\u300d\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u7cbe\u5ea6\u304c\u3055\u3089\u306b\u5411\u4e0a<\/li>\n<li>\u91d1\u984d\u30fb\u62c5\u5f53\u8005\u540d\u30fb\u6848\u4ef6\u540d\u3092\u500b\u4eba\u306b\u5408\u308f\u305b\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u30bf\u30fc\u30b2\u30c3\u30c8\u578b\u304c\u5897\u52a0<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u5909\u5316\u2461 \u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u507d\u88c5\uff08\u306a\u308a\u3059\u307e\u3057\uff09\u306e\u5de7\u5999\u5316\u3011<\/h3>\n\n<p>\nSPF\u30fbDKIM\u30fbDMARC\u306f\u300c\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u306e\u6b63\u5f53\u6027\u300d\u3092\u78ba\u8a8d\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<br\/>\n\u3057\u304b\u3057\u653b\u6483\u8005\u304c<strong>\u81ea\u8eab\u3067\u30c9\u30e1\u30a4\u30f3\u3092\u53d6\u5f97\u30fb\u6b63\u3057\u304f\u8a2d\u5b9a<\/strong>\u3059\u308b\u3053\u3068\u3067\u3001\n\u6280\u8853\u30d5\u30a3\u30eb\u30bf\u3092\u30d1\u30b9\u3057\u305f\u307e\u307e\u8868\u793a\u540d\u3060\u3051\u300c\u53d6\u5f15\u5148\u793e\u540d\u300d\u300c\u5f79\u54e1\u540d\u300d\u306b\u898b\u305b\u308b\u624b\u53e3\u304c\u5897\u3048\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"case-box\">\n<p><strong>\ud83d\udccb \u4e3b\u306a\u507d\u88c5\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n<ul>\n<li><strong>\u30d8\u30c3\u30c0From\u306e\u507d\u88c5\uff1a<\/strong>\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u8868\u793a\u3059\u308b\u300c\u5dee\u51fa\u4eba\u300d\u6b04\u3060\u3051\u3092\u66f8\u304d\u63db\u3048\u3001\u5b9f\u969b\u306e\u9001\u4fe1\u5143\uff08\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\uff09\u306f\u5225\u30c9\u30e1\u30a4\u30f3<\/li>\n<li><strong>\u985e\u4f3c\u30c9\u30e1\u30a4\u30f3\u53d6\u5f97\uff1a<\/strong>\u6b63\u898f\u30c9\u30e1\u30a4\u30f3\u306b\u9177\u4f3c\u3057\u305f\u6587\u5b57\u5217\uff08\u6570\u5b57\u306e\u300c1\u300d\u3092\u5c0f\u6587\u5b57\u300cl\u300d\u306b\u7f6e\u304d\u63db\u3048\u308b\u306a\u3069\uff09\u3067\u30c9\u30e1\u30a4\u30f3\u3092\u53d6\u5f97\u3057\u3001\u8a8d\u8a3c\u3092\u901a\u904e\u3055\u305b\u308b<\/li>\n<li><strong>\u30d5\u30ea\u30fc\u30e1\u30fc\u30eb\u60aa\u7528\uff1a<\/strong>\u9001\u4fe1\u5143\u306f\u6b63\u898fGmail\u30a2\u30ab\u30a6\u30f3\u30c8\u3067DMARC\u3092\u30d1\u30b9\u3002\u300c\u8868\u793a\u540d\u300d\u3060\u3051\u5f79\u54e1\u540d\u306b\u8a2d\u5b9a<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u5909\u5316\u2462 \u30c1\u30e3\u30c3\u30c8\u30c4\u30fc\u30eb\u3078\u306e\u8a98\u5c0e\u578b\u653b\u6483\uff08BEC\u9032\u5316\u5f62\uff09\u3011<\/h3>\n\n<p>\n2025\u5e7412\u6708\u301c2026\u5e741\u6708\u306b\u6025\u5897\u3057\u305f\u300cLINE\u8a98\u5c0e\u578bBEC\u300d\u306e\u3088\u3046\u306b\u3001<br\/>\n\u30e1\u30fc\u30eb\u306f\u3042\u304f\u307e\u3067\u5165\u53e3\u306b\u904e\u304e\u305a\u3001\u30c1\u30e3\u30c3\u30c8\u30c4\u30fc\u30eb\u3078\u8a98\u5c0e\u3057\u3066\u304b\u3089\u91d1\u92ad\u3084\u60c5\u5831\u3092\u643e\u53d6\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u304c\u5b9a\u7740\u3057\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"alert-box\">\n<p><strong>\u26a0\ufe0f \u306a\u305c\u30c1\u30e3\u30c3\u30c8\u304c\u72d9\u308f\u308c\u308b\u306e\u304b<\/strong><\/p>\n<ul>\n<li>\u300c\u793e\u5185\u30c4\u30fc\u30eb\u306f\u5b89\u5168\u300d\u3068\u3044\u3046\u601d\u3044\u8fbc\u307f\u304c\u5b88\u308a\u3092\u7de9\u304f\u3057\u3084\u3059\u3044<\/li>\n<li>\u9001\u4fe1\u5143\u78ba\u8a8d\u306e\u7fd2\u6163\u304c\u306a\u304f\u3001\u30b9\u30d4\u30fc\u30c9\u91cd\u8996\u3067\u691c\u8a3c\u304c\u5f8c\u56de\u3057\u306b\u306a\u308b<\/li>\n<li>\u30e1\u30fc\u30eb\u4ee5\u4e0a\u306b\u300c\u65e2\u8aad\u30fb\u8fd4\u4fe1\u300d\u306e\u30d7\u30ec\u30c3\u30b7\u30e3\u30fc\u304c\u3042\u308a\u3001\u51b7\u9759\u306a\u5224\u65ad\u304c\u96e3\u3057\u3044<\/li>\n<\/ul>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u6280\u8853\u5bfe\u7b56\u3060\u3051\u3067\u9632\u304e\u5207\u308c\u306a\u3044\u7406\u7531<\/h2>\n\n<p>\nSPF\u30fbDKIM\u30fbDMARC\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u306f\u5fc5\u8981\u6761\u4ef6\u3067\u3059\u304c\u3001\u5341\u5206\u6761\u4ef6\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\n<\/p>\n\n<table class=\"comparison-table\">\n<thead>\n<tr>\n<th>\u5bfe\u7b56<\/th>\n<th>\u9632\u3052\u308b\u3082\u306e<\/th>\n<th>\u9632\u3052\u306a\u3044\u3082\u306e\uff08\u9650\u754c\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>SPF<\/strong><\/td>\n<td>\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u9001\u4fe1<\/td>\n<td>\u653b\u6483\u8005\u304c\u6b63\u898f\u8a2d\u5b9a\u3057\u305f\u5225\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u9001\u4fe1\u3002\u8ee2\u9001\u30e1\u30fc\u30eb\u306eIP\u5909\u66f4\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>DKIM<\/strong><\/td>\n<td>\u9001\u4fe1\u5f8c\u306e\u30e1\u30fc\u30eb\u672c\u6587\u30fb\u30d8\u30c3\u30c0\u6539\u3056\u3093<\/td>\n<td>\u653b\u6483\u8005\u30c9\u30e1\u30a4\u30f3\u3067\u6b63\u898f\u7f72\u540d\u3055\u308c\u305f\u507d\u30e1\u30fc\u30eb\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>DMARC<\/strong><\/td>\n<td>SPF\u30fbDKIM\u3068\u30d8\u30c3\u30c0From\u306e\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af<\/td>\n<td>\u6b63\u898f\u8a8d\u8a3c\u6e08\u307f\u5225\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u3063\u305f\u507d\u30e1\u30fc\u30eb\u3002\u8868\u793a\u540d\u3060\u3051\u306e\u507d\u88c5\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>AI\u30d5\u30a3\u30eb\u30bf<\/strong><\/td>\n<td>\u65e2\u77e5\u30d1\u30bf\u30fc\u30f3\u306e\u30b9\u30d1\u30e0\u30fb\u30de\u30eb\u30a6\u30a7\u30a2<\/td>\n<td>AI\u751f\u6210\u306e\u81ea\u7136\u306a\u6587\u7ae0\u3001\u521d\u51fa\u30d1\u30bf\u30fc\u30f3\u306e\u9ad8\u5ea6\u6a19\u7684\u578b\u653b\u6483\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<div class=\"warning-box\">\n<p><strong>\ud83d\udca1 \u6838\u5fc3<\/strong><\/p>\n<p>\n\u30e1\u30fc\u30eb\u653b\u6483\u306e\u672c\u8cea\u306f<strong>\u300c\u6280\u8853\u7684\u306a\u7a81\u7834\u300d\u3067\u306f\u306a\u304f\u300c\u4eba\u306e\u5224\u65ad\u3092\u72c2\u308f\u305b\u308b\u3053\u3068\u300d<\/strong>\u3067\u3059\u3002<br\/>\n\u3069\u308c\u307b\u3069\u7cbe\u5de7\u306a\u30d5\u30a3\u30eb\u30bf\u304c\u3042\u3063\u3066\u3082\u3001\u53d7\u4fe1\u8005\u304c\u300c\u672c\u7269\u3060\u300d\u3068\u4fe1\u3058\u3066\u884c\u52d5\u3059\u308c\u3070\u88ab\u5bb3\u306f\u767a\u751f\u3057\u307e\u3059\u3002<br\/>\n<strong>\u6280\u8853\u5bfe\u7b56\uff0b\u4eba\u7684\u5bfe\u7b56\uff0b\u7d44\u7e54\u30eb\u30fc\u30eb\u306e\u4e09\u5c64<\/strong>\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\n<\/p>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u4eca\u3053\u305d\u898b\u76f4\u3059\u3079\u304d\u5bfe\u7b56\u306e\u512a\u5148\u9806\u4f4d<\/h2>\n\n<h3>\u3010\u2705 \u6280\u8853\u9762\u306e\u6574\u5099\uff08\u307e\u305a\u73fe\u72b6\u78ba\u8a8d\u304b\u3089\uff09\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<ul>\n<li>\u2714 SPF\u30fbDKIM\u30fbDMARC\u306e\u8a2d\u5b9a\u72b6\u6cc1\u3092\u78ba\u8a8d\u3057\u3001DMARC\u30dd\u30ea\u30b7\u30fc\u3092\u6bb5\u968e\u7684\u306b <code>p=quarantine<\/code> \u2192 <code>p=reject<\/code> \u3078\u5f37\u5316<\/li>\n<li>\u2714 DMARC\u30ec\u30dd\u30fc\u30c8\uff08RUA\u30ec\u30dd\u30fc\u30c8\uff09\u3092\u5b9a\u671f\u7684\u306b\u78ba\u8a8d\u3057\u3001\u4e0d\u5be9\u306a\u9001\u4fe1\u5143\u3092\u628a\u63e1<\/li>\n<li>\u2714 \u30e1\u30fc\u30eb\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u9694\u96e2\u30dd\u30ea\u30b7\u30fc\u3092\u7dad\u6301\u30fb\u5f37\u5316\uff08\"\u6e1b\u3063\u305f\u304b\u3089\u7de9\u3081\u308b\"\u306f\u9006\u52b9\u679c\uff09<\/li>\n<li>\u2714 \u985e\u4f3c\u30c9\u30e1\u30a4\u30f3\u306e\u76e3\u8996\u30c4\u30fc\u30eb\u5c0e\u5165\u3092\u691c\u8a0e<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u2705 \u904b\u7528\u30eb\u30fc\u30eb\u306e\u6574\u5099\uff08\u4eba\u7684\u5bfe\u7b56\uff09\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<ul>\n<li>\u2714 <strong>\u91d1\u92ad\u6307\u793a\u306f\u5fc5\u305a\u96fb\u8a71\u307e\u305f\u306f\u5bfe\u9762\u3067\u4e8c\u91cd\u78ba\u8a8d<\/strong>\uff08\u300c\u81f3\u6025\u300d\u300c\u5f79\u54e1\u6307\u793a\u300d\u306f\u7279\u306b\u30ea\u30b9\u30af\u9ad8\uff09<\/li>\n<li>\u2714 \u30e1\u30fc\u30eb\u30fb\u30c1\u30e3\u30c3\u30c8\u306e\u307f\u3067\u5b8c\u7d50\u3059\u308b\u632f\u8fbc\u30fb\u9001\u91d1\u30fb\u53e3\u5ea7\u5909\u66f4\u306e\u7981\u6b62\u3092\u30eb\u30fc\u30eb\u5316<\/li>\n<li>\u2714 \u77e5\u3089\u306a\u3044\u5916\u90e8\u304b\u3089\u306e\u30c1\u30e3\u30c3\u30c8\u62db\u5f85\u30fb\u30b0\u30eb\u30fc\u30d7\u8ffd\u52a0\u306f\u7ba1\u7406\u8005\u78ba\u8a8d\u3092\u5fc5\u9808\u3068\u3059\u308b<\/li>\n<li>\u2714 \u300c\u7591\u554f\u3092\u6301\u3063\u3066\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3092\u8a55\u4fa1\u3059\u308b\u300d\u6587\u5316\u306e\u91b8\u6210<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u2705 \u6559\u80b2\u3068\u8a13\u7df4\uff08\u7d44\u7e54\u7684\u5bfe\u7b56\uff09\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<ul>\n<li>\u2714 \u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30e1\u30fc\u30eb\u8a13\u7df4\u3092\u5b9a\u671f\u5b9f\u65bd\uff08AI\u751f\u6210\u578b\u306e\u81ea\u7136\u306a\u6587\u7ae0\u30d1\u30bf\u30fc\u30f3\u3092\u542b\u3081\u308b\uff09<\/li>\n<li>\u2714 \u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u5831\u544a\u306e\u30cf\u30fc\u30c9\u30eb\u3092\u4e0b\u3052\u3001\u7591\u308f\u3057\u3044\u5834\u5408\u306f\u3059\u3050\u76f8\u8ac7\u3067\u304d\u308b\u4f53\u5236\u3092\u6574\u5099<\/li>\n<li>\u2714 \u5168\u793e\u54e1\u5411\u3051\u306b\u300c\u91cf\u306f\u6e1b\u3063\u305f\u304c\u8cea\u306f\u4e0a\u304c\u3063\u305f\u300d\u3068\u3044\u3046\u73fe\u72b6\u8a8d\u8b58\u3092\u5171\u6709<\/li>\n<\/ul>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u4eca\u3059\u3050\u78ba\u8a8d\u3067\u304d\u308b\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n\n<h3>\u3010\u6280\u8853\u30c1\u30a7\u30c3\u30af\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<p><strong>\ud83d\udccb \u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u25a1 \u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306eSPF\u30fbDKIM\u30fbDMARC\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3066\u3044\u308b<\/li>\n<li>\u25a1 DMARC\u30dd\u30ea\u30b7\u30fc\u304c <code>p=none<\/code> \u306e\u307e\u307e\u653e\u7f6e\u3055\u308c\u3066\u3044\u306a\u3044<\/li>\n<li>\u25a1 DMARC\u306eRUA\u30ec\u30dd\u30fc\u30c8\u3092\u53d7\u4fe1\u30fb\u5206\u6790\u3059\u308b\u904b\u7528\u304c\u3042\u308b<\/li>\n<li>\u25a1 \u30e1\u30fc\u30eb\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u9694\u96e2\u30eb\u30fc\u30eb\u3092\u300c\u91cf\u304c\u6e1b\u3063\u305f\u304b\u3089\u300d\u3068\u7de9\u3081\u3066\u3044\u306a\u3044<\/li>\n<li>\u25a1 \u985e\u4f3c\u30c9\u30e1\u30a4\u30f3\uff08\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306b\u4f3c\u305b\u305f\u507d\u30c9\u30e1\u30a4\u30f3\uff09\u306e\u76e3\u8996\u304c\u3067\u304d\u3066\u3044\u308b<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u904b\u7528\u30fb\u4eba\u7684\u30c1\u30a7\u30c3\u30af\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<p><strong>\ud83d\udccb \u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u25a1 \u91d1\u92ad\u30fb\u53e3\u5ea7\u5909\u66f4\u306e\u6307\u793a\u306f\u30e1\u30fc\u30eb\u30fb\u30c1\u30e3\u30c3\u30c8\u5358\u72ec\u3067\u5b9f\u884c\u3057\u306a\u3044\u30eb\u30fc\u30eb\u304c\u3042\u308b<\/li>\n<li>\u25a1 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<strong>\u4e3b\u8981\u30d7\u30ed\u30d0\u30a4\u30c0\u306e\u898f\u5236\u5f37\u5316\u3067\u3001\u7121\u5dee\u5225\u5927\u91cf\u578b\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u306f\u6e1b\u5c11<\/strong><br\/>\n\u2192 \u3057\u304b\u3057\u3053\u308c\u306f\u300c\u653b\u6483\u8005\u304c\u91cf\u3088\u308a\u8cea\u306b\u5207\u308a\u66ff\u3048\u305f\u300d\u3053\u3068\u3092\u610f\u5473\u3059\u308b<\/li>\n<li>\u2714 <strong>AI\u751f\u6210\u306e\u81ea\u7136\u306a\u6587\u7ae0\u30fb\u7cbe\u5de7\u306a\u30c9\u30e1\u30a4\u30f3\u507d\u88c5\u30fb\u30c1\u30e3\u30c3\u30c8\u8a98\u5c0e\u578b<\/strong><br\/>\n\u2192 \u6280\u8853\u30d5\u30a3\u30eb\u30bf\u3092\u3059\u308a\u629c\u3051\u3066\u4eba\u306e\u5224\u65ad\u3092\u72c2\u308f\u305b\u308b\u3053\u3068\u304c\u76ee\u7684<\/li>\n<li>\u2714 <strong>\u300c\u6e1b\u3063\u305f\u304b\u3089\u5b89\u5fc3\u300d\u3067\u306f\u306a\u304f\u300c\u6b8b\u3063\u305f1\u901a\u304c\u5371\u967a\u300d<\/strong><br\/>\n\u2192 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\u6700\u3082\u91cd\u8981\u306a\u3053\u3068<\/strong><\/p>\n<p>\n<strong>\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\u300d\u306f\u653b\u6483\u8005\u306e\u6226\u7565\u5909\u66f4\u306e\u30b5\u30a4\u30f3\u3067\u3059\u3002<\/strong><br\/>\n\u91cf\u304c\u6e1b\u3063\u305f\u3053\u3068\u306b\u5b89\u5835\u305b\u305a\u3001\u6b8b\u3063\u305f\u653b\u6483\u30e1\u30fc\u30eb\u306e\u300c\u8cea\u300d\u306b\u76ee\u3092\u5411\u3051\u308b\u3053\u3068\u304c\u3001<br\/>\n\u4eca\u6700\u3082\u5fc5\u8981\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u610f\u8b58\u306e\u8ee2\u63db\u3067\u3059\u3002\n<\/p>\n<\/div>\n\n<p>\n\u6c17\u306b\u306a\u308b\u70b9\u304c\u3042\u308c\u3070\u3001<br\/>\n\u500b\u5225\u306b\u72b6\u6cc1\u3092\u4f3a\u3044\u306a\u304c\u3089\u306e\u3054\u76f8\u8ac7\u3082\u53ef\u80fd\u3067\u3059\u3002<br\/>\n\u304a\u6c17\u8efd\u306b\u3054\u9023\u7d61\u304f\u3060\u3055\u3044\u3002\n<\/p>\n\n<p>\n\u672c\u65e5\u3082\u3001\u3069\u3046\u305e\u5b89\u5168\u306a\u4e00\u65e5\u3092\u304a\u904e\u3054\u3057\u304f\u3060\u3055\u3044\u3002\n<\/p>\n\n<h3>\u25a0 \u53c2\u8003\u60c5\u5831<\/h3>\n\n<ul>\n<li><a href=\"https:\/\/support.google.com\/a\/answer\/14229414?hl=ja\" target=\"_blank\">Google \u30e1\u30fc\u30eb\u9001\u4fe1\u8005\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff08\u516c\u5f0f\uff09<\/a><\/li>\n<li><a href=\"https:\/\/knowledge.brandkeeper.jp\/dmarc\/1778\/\" target=\"_blank\">Microsoft Outlook DMARC\u8981\u4ef6\uff082025\u5e745\u6708\u301c\uff09<\/a><\/li>\n<li><a href=\"https:\/\/maildata.jp\/blog\/blog-2025-01-24.html\" target=\"_blank\">Yahoo! Japan DMARC\u5bfe\u5fdc\u306e\u63a8\u79fb<\/a><\/li>\n<li><a href=\"https:\/\/powerdmarc.com\/ja\/email-phishing-dmarc-statistics\/\" target=\"_blank\">PowerDMARC\uff1a2025\u5e74\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u7d71\u8a08<\/a><\/li>\n<li><a href=\"https:\/\/www.ipa.go.jp\/security\/bec\/index.html\" target=\"_blank\">IPA\uff1a\u30d3\u30b8\u30cd\u30b9\u30e1\u30fc\u30eb\u8a50\u6b3a\uff08BEC\uff09\u5bfe\u7b56<\/a><\/li>\n<\/ul>\n\n<p class=\"note-text\">\n\u203b2026\u5e742\u6708\u6642\u70b9\u306e\u60c5\u5831\u3067\u3059\u3002<br\/>\n\u6700\u65b0\u60c5\u5831\u306f\u5404\u516c\u5f0f\u30b5\u30a4\u30c8\u3067\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n<\/p>\n\n\n\n\n\n<hr style=\"border: none; border-top: 1px solid #E5E7EB; margin: 3em 0;\"\/>\n\n<p>\n\u6700\u5f8c\u307e\u3067\u304a\u8aad\u307f\u3044\u305f\u3060\u304d\u3001\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002\n<\/p>\n\n<p>\n\u5f0a\u793e\u306e\u793e\u540d\u3068\u306a\u3063\u3066\u3044\u308b\u300c\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u300d\u306f\u3001<br\/>\n\u300c\u56de\u5fa9\u529b\u300d\u3084\u300c\u5f3e\u6027\u300d\u3092\u610f\u5473\u3059\u308b\u82f1\u5358\u8a9e\u3067\u3059\u3002\n<\/p>\n\n<p>\n\u3064\u307e\u308a\u3001\u74b0\u5883\u306e\u5909\u5316\u3084\u7a81\u767a\u7684\u306a\u4e8b\u8c61\u306b\u5bfe\u3057\u3066<br\/>\n\u3057\u306a\u3084\u304b\u306b\u7c98\u308a\u5f37\u304f\u5bfe\u5fdc\u3057\u3066\u3044\u304f<br\/>\n\u7acb\u3061\u4f4d\u7f6e\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<p>\n\u76ee\u307e\u3050\u308b\u3057\u304f\u5909\u5316\u3059\u308b\u6642\u6d41\u306e\u4e2d\u3067\u3001<br\/>\n\u305d\u308c\u3092\u898b\u6975\u3081\u3064\u3064\u6d41\u3055\u308c\u306a\u3044\u89e3\u6c7a\u7b56\u3092\u63d0\u6848\u81f4\u3057\u307e\u3059\u3002\n<\/p>\n\n<p style=\"font-size: 0.9em; margin-top: 2em;\">\n****************************<br\/>\n\u30b5\u30a4\u30d0\u30fc\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u682a\u5f0f\u4f1a\u793e<br\/>\n\u65e5\u672c\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u682a\u5f0f\u4f1a\u793e<br\/>\n\u3012103-0026<br\/>\n\u6771\u4eac\u90fd\u4e2d\u592e\u533a\u65e5\u672c\u6a4b\u515c\u753a17\u756a1\u53f7<br\/>\n\u65e5\u672c\u6a4b\u30ed\u30a4\u30e4\u30eb\u30d7\u30e9\u30b6706<br\/>\nTel 03-6823-8902<br\/>\nE-mail: <a href=\"\/cdn-cgi\/l\/email-protection\" class=\"__cf_email__\" data-cfemail=\"6c05020a032c060d1c0d02411e091f05000509020f09420f0342061c\">[email protected]<\/a><br\/>\nhttps:\/\/japan-resilience.co.jp\/cyber<br\/>\n****************************\n<\/p>\n\n<\/article>\n<\/div>\n<script data-cfasync=\"false\" src=\"\/cdn-cgi\/scripts\/5c5dd728\/cloudflare-static\/email-decode.min.js\"><\/script><\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6fc0\u6e1b\u3057\u305f\u80cc\u666f\u3068\u3001\u3053\u308c\u304b\u3089\u306e\u653b\u6483\"\u8cea\"\u306e\u5909\u5316\u3092\u898b\u636e\u3048\u305f\u5bfe\u7b56 \u30b5\u30a4\u30d0\u30fc\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u682a\u5f0f\u4f1a\u793e\u203b\u672c\u53f7\u306fAI\u3067\u57f7\u7b46\u3057\u305f\u6587\u7ae0\u3092\u7b46\u8005\u304c\u76e3\u4fee\u3057\u3066\u3044\u307e\u3059\u3002 \u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6fc0\u6e1b\u3057\u305f\u80cc\u666f\u3068\u3001\u3053\u308c\u304b\u3089\u306e\u653b\u6483\"\u8cea\"\u306e\u5909\u5316\u3092\u898b\u636e\u3048\u305f\u5bfe\u7b56 […]<\/p>\n","protected":false},"author":8,"featured_media":2605,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_memberships_contains_paid_content":false,"vkexunit_cta_each_option":"","footnotes":""},"categories":[8],"tags":[],"class_list":["post-3565","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-information"],"jetpack_featured_media_url":"https:\/\/japan-resilience.co.jp\/cyber\/wp-content\/uploads\/2024\/09\/d05706d3e2e4253a4c22ba1114d027b1.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/posts\/3565","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/comments?post=3565"}],"version-history":[{"count":4,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/posts\/3565\/revisions"}],"predecessor-version":[{"id":3569,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/posts\/3565\/revisions\/3569"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/media\/2605"}],"wp:attachment":[{"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/media?parent=3565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/categories?post=3565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/japan-resilience.co.jp\/cyber\/wp-json\/wp\/v2\/tags?post=3565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":3565,"date":"2026-02-27T09:19:01","date_gmt":"2026-02-27T00:19:01","guid":{"rendered":"https:\/\/japan-resilience.co.jp\/cyber\/?p=3565"},"modified":"2026-02-27T11:23:07","modified_gmt":"2026-02-27T02:23:07","slug":"column","status":"publish","type":"post","link":"https:\/\/japan-resilience.co.jp\/cyber\/2026\/02\/27\/column\/","title":{"rendered":"\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6fc0\u6e1b\u3057\u305f\u80cc\u666f\u3068\u3001\u3053\u308c\u304b\u3089\u306e\u653b\u6483\"\u8cea\"\u306e\u5909\u5316\u3092\u898b\u636e\u3048\u305f\u5bfe\u7b56"},"content":{"rendered":"\n\n\n\n\n\n\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6fc0\u6e1b\u3057\u305f\u80cc\u666f\u3068\u3001\u3053\u308c\u304b\u3089\u306e\u653b\u6483\"\u8cea\"\u306e\u5909\u5316\u3092\u898b\u636e\u3048\u305f\u5bfe\u7b56<\/title>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Noto+Sans+JP:wght@400;500;700;900&display=swap\" rel=\"stylesheet\"\/>\n<style>\nbody {\n background-color: #f3f4f6;\n margin: 0;\n padding: 0;\n 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class=\"intro-section\">\n<p>\n\u4eca\u671d\u306f\u3001<br\/>\n<strong>\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\uff1d\u5b89\u5168\u306b\u306a\u3063\u305f\u3001\u3067\u306f\u306a\u3044\u300d<\/strong><br\/>\n\u3068\u3044\u3046\u3001\u73fe\u5728\u306e\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u672c\u8cea\u7684\u306a\u5909\u5316\u306b\u3064\u3044\u3066\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002\n<\/p>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 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class=\"comparison-table\">\n<thead>\n<tr>\n<th>\u30d7\u30ed\u30d0\u30a4\u30c0<\/th>\n<th>\u5f37\u5316\u6642\u671f<\/th>\n<th>\u4e3b\u306a\u5185\u5bb9<\/th>\n<th>\u5bfe\u8c61<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Yahoo! Japan<\/strong><\/td>\n<td>2024\u5e7412\u6708\u301c\u63a8\u5968\u958b\u59cb<br\/>2025\u5e74 \u6bb5\u968e\u7684\u7fa9\u52d9\u5316<\/td>\n<td>DMARC\u5bfe\u5fdc\u3092\u63a8\u5968\u5316\u2192\u672a\u5bfe\u5fdc\u30e1\u30fc\u30eb\u3092\u30b9\u30d1\u30e0\u6271\u3044\u3002<br\/>\u7c73\u56fdYahoo!\u306f2024\u5e742\u6708\u304b\u3089\u5927\u53e3\u9001\u4fe1\u8005\u3078\u306e\u7fa9\u52d9\u5316\u3092\u5148\u884c\u5b9f\u65bd\u3002<\/td>\n<td>\u5927\u91cf\u9001\u4fe1\u8005<\/td>\n<\/tr>\n<tr>\n<td><strong>Microsoft<br\/>\uff08Outlook\uff0fHotmail\uff09<\/strong><\/td>\n<td>2025\u5e745\u67085\u65e5\u301c<\/td>\n<td>SPF\u30fbDKIM\u30fbDMARC\u5bfe\u5fdc\u3092\u7fa9\u52d9\u4ed8\u3051\u3002<br\/>\u672a\u5bfe\u5fdc\u30e1\u30fc\u30eb\u306f\u30b8\u30e3\u30f3\u30af\u3078\u632f\u308a\u5206\u3051\u307e\u305f\u306f\u62d2\u5426\u3002<\/td>\n<td>1\u65e55,000\u901a\u8d85\u306e<br\/>\u5927\u91cf\u9001\u4fe1\u8005<\/td>\n<\/tr>\n<tr>\n<td><strong>Gmail\uff08Google\uff09<\/strong><\/td>\n<td>2025\u5e7411\u6708\u301c<br\/>\uff08\u5f37\u5316\u30d5\u30a7\u30fc\u30ba\uff09<\/td>\n<td>2024\u5e742\u6708\u306e\u7fa9\u52d9\u5316\u306b\u7d9a\u304d\u3001\u672a\u6e96\u62e0\u30d0\u30eb\u30af\u30e1\u30fc\u30eb\u3078\u306e<br\/>\u30da\u30ca\u30eb\u30c6\u30a3\u3092\u6bb5\u968e\u7684\u306b\u5f37\u5316\u3002\u9045\u5ef6\u30fb\u62d2\u5426\u306e\u5272\u5408\u3092\u62e1\u5927\u3002<\/td>\n<td>1\u65e55,000\u901a\u8d85\u306e<br\/>\u5927\u91cf\u9001\u4fe1\u8005<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<div class=\"case-box\">\n<p><strong>\ud83d\udccb Yahoo! Japan\u306e\u7d4c\u7def\u306b\u3064\u3044\u3066<\/strong><\/p>\n<p>\n\u7c73\u56fdYahoo!\u304c\u5927\u53e3\u9001\u4fe1\u8005\u3078\u306eDMARC\u7fa9\u52d9\u5316\u30922024\u5e742\u6708\u304b\u3089\u958b\u59cb\u3057\u305f\u306e\u306b\u5bfe\u3057\u3001<br\/>\nYahoo! Japan\u306f2024\u5e7412\u6708\u306bDMARC\u5bfe\u5fdc\u3092\u300c\u63a8\u5968\u300d\u3068\u3057\u3066\u6848\u5185\u3057\u30012025\u5e74\u4ee5\u964d\u306b\u6bb5\u968e\u7684\u306a\u7fa9\u52d9\u5316\u3078\u79fb\u884c\u3057\u307e\u3057\u305f\u3002<br\/>\n\u300c4\u6708\u304b\u3089\u5f37\u5316\u300d\u3068\u3044\u3046\u4e00\u90e8\u5831\u9053\u306f\u7c73\u56fdYahoo!\u306e\u30d5\u30a7\u30fc\u30ba\u30a2\u30c3\u30d7\u3092\u6307\u3059\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3001<br\/>\n\u56fd\u5185\u5411\u3051\u767a\u4fe1\u3067\u306f\u300c2025\u5e74\u306b\u6bb5\u968e\u7684\u7fa9\u52d9\u5316\u300d\u3068\u8868\u73fe\u3059\u308b\u306e\u304c\u6b63\u78ba\u3067\u3059\u3002\n<\/p>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u300c\u91cf\u306e\u6e1b\u5c11\u300d\u304c\u793a\u3059\u3001\u65b0\u305f\u306a\u8105\u5a01\u69cb\u9020<\/h2>\n\n<p>\n\u5927\u91cf\u7121\u5dee\u5225\u578b\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u5f3e\u304b\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u534a\u9762\u3001<br\/>\n\u653b\u6483\u8005\u306f\u6226\u7565\u3092\u8ee2\u63db\u3057\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"warning-box\">\n<p><strong>\ud83d\udca1 \u653b\u6483\u306e\u8cea\u7684\u30b7\u30d5\u30c8<\/strong><\/p>\n<p>\n<strong>\u8a8d\u8a3c\u3092\u3059\u308a\u629c\u3051\u308b\u300c\u5c11\u6570\u30fb\u9ad8\u7cbe\u5ea6\u300d\u306e\u30bf\u30fc\u30b2\u30c3\u30c8\u578b\u653b\u6483\u306b\u30b7\u30d5\u30c8\u3057\u3066\u3044\u308b<\/strong>\u306e\u3067\u3059\u3002<br\/>\n\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\u300d\u306f\u300c\u653b\u6483\u304c\u6e1b\u3063\u305f\u300d\u3067\u306f\u306a\u304f\u3001<br\/>\n\u300c\u5927\u91cf\u9001\u4fe1\u578b\u304c\u6e1b\u308a\u3001\u898b\u7834\u308a\u306b\u304f\u3044\u653b\u6483\u304c\u5897\u3048\u305f\u300d\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\n<\/p>\n<\/div>\n\n<h3>\u3010\u5909\u5316\u2460 AI\u751f\u6210\u306b\u3088\u308b\"\u81ea\u7136\u306a\u6587\u7ae0\"\u306e\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3011<\/h3>\n\n<p>\n\u5f93\u6765\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u306f\u4e0d\u81ea\u7136\u306a\u65e5\u672c\u8a9e\u3084\u6a5f\u68b0\u7ffb\u8a33\u306e\u8de1\u304c\u898b\u7834\u308b\u624b\u304c\u304b\u308a\u3067\u3057\u305f\u3002<br\/>\n\u3057\u304b\u3057\u751f\u6210AI\u306e\u666e\u53ca\u306b\u3088\u308a\u3001\u6587\u6cd5\u7684\u306b\u5b8c\u74a7\u3067\u656c\u8a9e\u30fb\u696d\u754c\u7528\u8a9e\u3082\u6b63\u78ba\u306a\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30e1\u30fc\u30eb\u304c\n\u5bb9\u6613\u306b\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"alert-box\">\n<p><strong>\u26a0\ufe0f \u5909\u5316\u306e\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u300c\u65e5\u672c\u8a9e\u304c\u304a\u304b\u3057\u3044\u300d\u3068\u3044\u3046\u5224\u65ad\u57fa\u6e96\u304c\u3082\u306f\u3084\u901a\u7528\u3057\u306a\u3044<\/li>\n<li>\u9001\u4fe1\u8005\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6b63\u898f\u306b\u898b\u305b\u308b\u300c\u306a\u308a\u3059\u307e\u3057\u300d\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u7cbe\u5ea6\u304c\u3055\u3089\u306b\u5411\u4e0a<\/li>\n<li>\u91d1\u984d\u30fb\u62c5\u5f53\u8005\u540d\u30fb\u6848\u4ef6\u540d\u3092\u500b\u4eba\u306b\u5408\u308f\u305b\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u30bf\u30fc\u30b2\u30c3\u30c8\u578b\u304c\u5897\u52a0<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u5909\u5316\u2461 \u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u507d\u88c5\uff08\u306a\u308a\u3059\u307e\u3057\uff09\u306e\u5de7\u5999\u5316\u3011<\/h3>\n\n<p>\nSPF\u30fbDKIM\u30fbDMARC\u306f\u300c\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u306e\u6b63\u5f53\u6027\u300d\u3092\u78ba\u8a8d\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<br\/>\n\u3057\u304b\u3057\u653b\u6483\u8005\u304c<strong>\u81ea\u8eab\u3067\u30c9\u30e1\u30a4\u30f3\u3092\u53d6\u5f97\u30fb\u6b63\u3057\u304f\u8a2d\u5b9a<\/strong>\u3059\u308b\u3053\u3068\u3067\u3001\n\u6280\u8853\u30d5\u30a3\u30eb\u30bf\u3092\u30d1\u30b9\u3057\u305f\u307e\u307e\u8868\u793a\u540d\u3060\u3051\u300c\u53d6\u5f15\u5148\u793e\u540d\u300d\u300c\u5f79\u54e1\u540d\u300d\u306b\u898b\u305b\u308b\u624b\u53e3\u304c\u5897\u3048\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"case-box\">\n<p><strong>\ud83d\udccb \u4e3b\u306a\u507d\u88c5\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n<ul>\n<li><strong>\u30d8\u30c3\u30c0From\u306e\u507d\u88c5\uff1a<\/strong>\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u8868\u793a\u3059\u308b\u300c\u5dee\u51fa\u4eba\u300d\u6b04\u3060\u3051\u3092\u66f8\u304d\u63db\u3048\u3001\u5b9f\u969b\u306e\u9001\u4fe1\u5143\uff08\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\uff09\u306f\u5225\u30c9\u30e1\u30a4\u30f3<\/li>\n<li><strong>\u985e\u4f3c\u30c9\u30e1\u30a4\u30f3\u53d6\u5f97\uff1a<\/strong>\u6b63\u898f\u30c9\u30e1\u30a4\u30f3\u306b\u9177\u4f3c\u3057\u305f\u6587\u5b57\u5217\uff08\u6570\u5b57\u306e\u300c1\u300d\u3092\u5c0f\u6587\u5b57\u300cl\u300d\u306b\u7f6e\u304d\u63db\u3048\u308b\u306a\u3069\uff09\u3067\u30c9\u30e1\u30a4\u30f3\u3092\u53d6\u5f97\u3057\u3001\u8a8d\u8a3c\u3092\u901a\u904e\u3055\u305b\u308b<\/li>\n<li><strong>\u30d5\u30ea\u30fc\u30e1\u30fc\u30eb\u60aa\u7528\uff1a<\/strong>\u9001\u4fe1\u5143\u306f\u6b63\u898fGmail\u30a2\u30ab\u30a6\u30f3\u30c8\u3067DMARC\u3092\u30d1\u30b9\u3002\u300c\u8868\u793a\u540d\u300d\u3060\u3051\u5f79\u54e1\u540d\u306b\u8a2d\u5b9a<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u5909\u5316\u2462 \u30c1\u30e3\u30c3\u30c8\u30c4\u30fc\u30eb\u3078\u306e\u8a98\u5c0e\u578b\u653b\u6483\uff08BEC\u9032\u5316\u5f62\uff09\u3011<\/h3>\n\n<p>\n2025\u5e7412\u6708\u301c2026\u5e741\u6708\u306b\u6025\u5897\u3057\u305f\u300cLINE\u8a98\u5c0e\u578bBEC\u300d\u306e\u3088\u3046\u306b\u3001<br\/>\n\u30e1\u30fc\u30eb\u306f\u3042\u304f\u307e\u3067\u5165\u53e3\u306b\u904e\u304e\u305a\u3001\u30c1\u30e3\u30c3\u30c8\u30c4\u30fc\u30eb\u3078\u8a98\u5c0e\u3057\u3066\u304b\u3089\u91d1\u92ad\u3084\u60c5\u5831\u3092\u643e\u53d6\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u304c\u5b9a\u7740\u3057\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<div class=\"alert-box\">\n<p><strong>\u26a0\ufe0f \u306a\u305c\u30c1\u30e3\u30c3\u30c8\u304c\u72d9\u308f\u308c\u308b\u306e\u304b<\/strong><\/p>\n<ul>\n<li>\u300c\u793e\u5185\u30c4\u30fc\u30eb\u306f\u5b89\u5168\u300d\u3068\u3044\u3046\u601d\u3044\u8fbc\u307f\u304c\u5b88\u308a\u3092\u7de9\u304f\u3057\u3084\u3059\u3044<\/li>\n<li>\u9001\u4fe1\u5143\u78ba\u8a8d\u306e\u7fd2\u6163\u304c\u306a\u304f\u3001\u30b9\u30d4\u30fc\u30c9\u91cd\u8996\u3067\u691c\u8a3c\u304c\u5f8c\u56de\u3057\u306b\u306a\u308b<\/li>\n<li>\u30e1\u30fc\u30eb\u4ee5\u4e0a\u306b\u300c\u65e2\u8aad\u30fb\u8fd4\u4fe1\u300d\u306e\u30d7\u30ec\u30c3\u30b7\u30e3\u30fc\u304c\u3042\u308a\u3001\u51b7\u9759\u306a\u5224\u65ad\u304c\u96e3\u3057\u3044<\/li>\n<\/ul>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u6280\u8853\u5bfe\u7b56\u3060\u3051\u3067\u9632\u304e\u5207\u308c\u306a\u3044\u7406\u7531<\/h2>\n\n<p>\nSPF\u30fbDKIM\u30fbDMARC\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u306f\u5fc5\u8981\u6761\u4ef6\u3067\u3059\u304c\u3001\u5341\u5206\u6761\u4ef6\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\n<\/p>\n\n<table class=\"comparison-table\">\n<thead>\n<tr>\n<th>\u5bfe\u7b56<\/th>\n<th>\u9632\u3052\u308b\u3082\u306e<\/th>\n<th>\u9632\u3052\u306a\u3044\u3082\u306e\uff08\u9650\u754c\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>SPF<\/strong><\/td>\n<td>\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u9001\u4fe1<\/td>\n<td>\u653b\u6483\u8005\u304c\u6b63\u898f\u8a2d\u5b9a\u3057\u305f\u5225\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u9001\u4fe1\u3002\u8ee2\u9001\u30e1\u30fc\u30eb\u306eIP\u5909\u66f4\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>DKIM<\/strong><\/td>\n<td>\u9001\u4fe1\u5f8c\u306e\u30e1\u30fc\u30eb\u672c\u6587\u30fb\u30d8\u30c3\u30c0\u6539\u3056\u3093<\/td>\n<td>\u653b\u6483\u8005\u30c9\u30e1\u30a4\u30f3\u3067\u6b63\u898f\u7f72\u540d\u3055\u308c\u305f\u507d\u30e1\u30fc\u30eb\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>DMARC<\/strong><\/td>\n<td>SPF\u30fbDKIM\u3068\u30d8\u30c3\u30c0From\u306e\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af<\/td>\n<td>\u6b63\u898f\u8a8d\u8a3c\u6e08\u307f\u5225\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u3063\u305f\u507d\u30e1\u30fc\u30eb\u3002\u8868\u793a\u540d\u3060\u3051\u306e\u507d\u88c5\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>AI\u30d5\u30a3\u30eb\u30bf<\/strong><\/td>\n<td>\u65e2\u77e5\u30d1\u30bf\u30fc\u30f3\u306e\u30b9\u30d1\u30e0\u30fb\u30de\u30eb\u30a6\u30a7\u30a2<\/td>\n<td>AI\u751f\u6210\u306e\u81ea\u7136\u306a\u6587\u7ae0\u3001\u521d\u51fa\u30d1\u30bf\u30fc\u30f3\u306e\u9ad8\u5ea6\u6a19\u7684\u578b\u653b\u6483\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<div class=\"warning-box\">\n<p><strong>\ud83d\udca1 \u6838\u5fc3<\/strong><\/p>\n<p>\n\u30e1\u30fc\u30eb\u653b\u6483\u306e\u672c\u8cea\u306f<strong>\u300c\u6280\u8853\u7684\u306a\u7a81\u7834\u300d\u3067\u306f\u306a\u304f\u300c\u4eba\u306e\u5224\u65ad\u3092\u72c2\u308f\u305b\u308b\u3053\u3068\u300d<\/strong>\u3067\u3059\u3002<br\/>\n\u3069\u308c\u307b\u3069\u7cbe\u5de7\u306a\u30d5\u30a3\u30eb\u30bf\u304c\u3042\u3063\u3066\u3082\u3001\u53d7\u4fe1\u8005\u304c\u300c\u672c\u7269\u3060\u300d\u3068\u4fe1\u3058\u3066\u884c\u52d5\u3059\u308c\u3070\u88ab\u5bb3\u306f\u767a\u751f\u3057\u307e\u3059\u3002<br\/>\n<strong>\u6280\u8853\u5bfe\u7b56\uff0b\u4eba\u7684\u5bfe\u7b56\uff0b\u7d44\u7e54\u30eb\u30fc\u30eb\u306e\u4e09\u5c64<\/strong>\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\n<\/p>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u4eca\u3053\u305d\u898b\u76f4\u3059\u3079\u304d\u5bfe\u7b56\u306e\u512a\u5148\u9806\u4f4d<\/h2>\n\n<h3>\u3010\u2705 \u6280\u8853\u9762\u306e\u6574\u5099\uff08\u307e\u305a\u73fe\u72b6\u78ba\u8a8d\u304b\u3089\uff09\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<ul>\n<li>\u2714 SPF\u30fbDKIM\u30fbDMARC\u306e\u8a2d\u5b9a\u72b6\u6cc1\u3092\u78ba\u8a8d\u3057\u3001DMARC\u30dd\u30ea\u30b7\u30fc\u3092\u6bb5\u968e\u7684\u306b <code>p=quarantine<\/code> \u2192 <code>p=reject<\/code> \u3078\u5f37\u5316<\/li>\n<li>\u2714 DMARC\u30ec\u30dd\u30fc\u30c8\uff08RUA\u30ec\u30dd\u30fc\u30c8\uff09\u3092\u5b9a\u671f\u7684\u306b\u78ba\u8a8d\u3057\u3001\u4e0d\u5be9\u306a\u9001\u4fe1\u5143\u3092\u628a\u63e1<\/li>\n<li>\u2714 \u30e1\u30fc\u30eb\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u9694\u96e2\u30dd\u30ea\u30b7\u30fc\u3092\u7dad\u6301\u30fb\u5f37\u5316\uff08\"\u6e1b\u3063\u305f\u304b\u3089\u7de9\u3081\u308b\"\u306f\u9006\u52b9\u679c\uff09<\/li>\n<li>\u2714 \u985e\u4f3c\u30c9\u30e1\u30a4\u30f3\u306e\u76e3\u8996\u30c4\u30fc\u30eb\u5c0e\u5165\u3092\u691c\u8a0e<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u2705 \u904b\u7528\u30eb\u30fc\u30eb\u306e\u6574\u5099\uff08\u4eba\u7684\u5bfe\u7b56\uff09\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<ul>\n<li>\u2714 <strong>\u91d1\u92ad\u6307\u793a\u306f\u5fc5\u305a\u96fb\u8a71\u307e\u305f\u306f\u5bfe\u9762\u3067\u4e8c\u91cd\u78ba\u8a8d<\/strong>\uff08\u300c\u81f3\u6025\u300d\u300c\u5f79\u54e1\u6307\u793a\u300d\u306f\u7279\u306b\u30ea\u30b9\u30af\u9ad8\uff09<\/li>\n<li>\u2714 \u30e1\u30fc\u30eb\u30fb\u30c1\u30e3\u30c3\u30c8\u306e\u307f\u3067\u5b8c\u7d50\u3059\u308b\u632f\u8fbc\u30fb\u9001\u91d1\u30fb\u53e3\u5ea7\u5909\u66f4\u306e\u7981\u6b62\u3092\u30eb\u30fc\u30eb\u5316<\/li>\n<li>\u2714 \u77e5\u3089\u306a\u3044\u5916\u90e8\u304b\u3089\u306e\u30c1\u30e3\u30c3\u30c8\u62db\u5f85\u30fb\u30b0\u30eb\u30fc\u30d7\u8ffd\u52a0\u306f\u7ba1\u7406\u8005\u78ba\u8a8d\u3092\u5fc5\u9808\u3068\u3059\u308b<\/li>\n<li>\u2714 \u300c\u7591\u554f\u3092\u6301\u3063\u3066\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3092\u8a55\u4fa1\u3059\u308b\u300d\u6587\u5316\u306e\u91b8\u6210<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u2705 \u6559\u80b2\u3068\u8a13\u7df4\uff08\u7d44\u7e54\u7684\u5bfe\u7b56\uff09\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<ul>\n<li>\u2714 \u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30e1\u30fc\u30eb\u8a13\u7df4\u3092\u5b9a\u671f\u5b9f\u65bd\uff08AI\u751f\u6210\u578b\u306e\u81ea\u7136\u306a\u6587\u7ae0\u30d1\u30bf\u30fc\u30f3\u3092\u542b\u3081\u308b\uff09<\/li>\n<li>\u2714 \u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u5831\u544a\u306e\u30cf\u30fc\u30c9\u30eb\u3092\u4e0b\u3052\u3001\u7591\u308f\u3057\u3044\u5834\u5408\u306f\u3059\u3050\u76f8\u8ac7\u3067\u304d\u308b\u4f53\u5236\u3092\u6574\u5099<\/li>\n<li>\u2714 \u5168\u793e\u54e1\u5411\u3051\u306b\u300c\u91cf\u306f\u6e1b\u3063\u305f\u304c\u8cea\u306f\u4e0a\u304c\u3063\u305f\u300d\u3068\u3044\u3046\u73fe\u72b6\u8a8d\u8b58\u3092\u5171\u6709<\/li>\n<\/ul>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u4eca\u3059\u3050\u78ba\u8a8d\u3067\u304d\u308b\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n\n<h3>\u3010\u6280\u8853\u30c1\u30a7\u30c3\u30af\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<p><strong>\ud83d\udccb \u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u25a1 \u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306eSPF\u30fbDKIM\u30fbDMARC\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3066\u3044\u308b<\/li>\n<li>\u25a1 DMARC\u30dd\u30ea\u30b7\u30fc\u304c <code>p=none<\/code> \u306e\u307e\u307e\u653e\u7f6e\u3055\u308c\u3066\u3044\u306a\u3044<\/li>\n<li>\u25a1 DMARC\u306eRUA\u30ec\u30dd\u30fc\u30c8\u3092\u53d7\u4fe1\u30fb\u5206\u6790\u3059\u308b\u904b\u7528\u304c\u3042\u308b<\/li>\n<li>\u25a1 \u30e1\u30fc\u30eb\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u9694\u96e2\u30eb\u30fc\u30eb\u3092\u300c\u91cf\u304c\u6e1b\u3063\u305f\u304b\u3089\u300d\u3068\u7de9\u3081\u3066\u3044\u306a\u3044<\/li>\n<li>\u25a1 \u985e\u4f3c\u30c9\u30e1\u30a4\u30f3\uff08\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306b\u4f3c\u305b\u305f\u507d\u30c9\u30e1\u30a4\u30f3\uff09\u306e\u76e3\u8996\u304c\u3067\u304d\u3066\u3044\u308b<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u904b\u7528\u30fb\u4eba\u7684\u30c1\u30a7\u30c3\u30af\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<p><strong>\ud83d\udccb \u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u25a1 \u91d1\u92ad\u30fb\u53e3\u5ea7\u5909\u66f4\u306e\u6307\u793a\u306f\u30e1\u30fc\u30eb\u30fb\u30c1\u30e3\u30c3\u30c8\u5358\u72ec\u3067\u5b9f\u884c\u3057\u306a\u3044\u30eb\u30fc\u30eb\u304c\u3042\u308b<\/li>\n<li>\u25a1 \u5f79\u54e1\u30fb\u4e0a\u53f8\u304b\u3089\u306e\u300c\u81f3\u6025\u300d\u6307\u793a\u3067\u3082\u96fb\u8a71\u78ba\u8a8d\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u304c\u3042\u308b<\/li>\n<li>\u25a1 \u77e5\u3089\u306a\u3044\u5916\u90e8\u304b\u3089\u306e\u30c1\u30e3\u30c3\u30c8\u62db\u5f85\u3092\u7ba1\u7406\u8005\u627f\u8a8d\u306a\u304f\u53d7\u3051\u306a\u3044\u30eb\u30fc\u30eb\u304c\u3042\u308b<\/li>\n<li>\u25a1 \u300c\u7591\u308f\u3057\u3044\u30e1\u30fc\u30eb\u3092\u5831\u544a\u3057\u305f\u4eba\u3092\u8cac\u3081\u306a\u3044\u300d\u6587\u5316\u304c\u6839\u4ed8\u3044\u3066\u3044\u308b<\/li>\n<\/ul>\n<\/div>\n\n<h3>\u3010\u6559\u80b2\u30fb\u7d44\u7e54\u30c1\u30a7\u30c3\u30af\u3011<\/h3>\n\n<div class=\"checklist-box\">\n<p><strong>\ud83d\udccb \u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u25a1 \u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u8a13\u7df4\u30e1\u30fc\u30eb\u3092\u904e\u53bb1\u5e74\u4ee5\u5185\u306b\u5b9f\u65bd\u3057\u305f<\/li>\n<li>\u25a1 \u8a13\u7df4\u30e1\u30fc\u30eb\u306bAI\u751f\u6210\u306e\u81ea\u7136\u306a\u65e5\u672c\u8a9e\u30d1\u30bf\u30fc\u30f3\u3092\u542b\u3081\u3066\u3044\u308b<\/li>\n<li>\u25a1 \u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u5831\u544a\u7a93\u53e3\u3068\u624b\u9806\u304c\u5168\u793e\u54e1\u306b\u5468\u77e5\u3055\u308c\u3066\u3044\u308b<\/li>\n<li>\u25a1 \u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\uff1d\u5b89\u5168\u300d\u3068\u3044\u3046\u8aa4\u8a8d\u8b58\u3092\u6255\u62ed\u3059\u308b\u793e\u5185\u5468\u77e5\u3092\u884c\u3063\u3066\u3044\u308b<\/li>\n<\/ul>\n<\/div>\n\n\n\n\n\n<h2>\u25a0 \u307e\u3068\u3081\uff1a\u91cf\u306e\u5b89\u5fc3\u304c\"\u8cea\u306e\u898b\u843d\u3068\u3057\"\u3092\u751f\u3080<\/h2>\n\n<div class=\"alert-box\">\n<p><strong>\u26a0\ufe0f \u4eca\u53f7\u306e\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>\n<ul>\n<li>\u2714 <strong>\u4e3b\u8981\u30d7\u30ed\u30d0\u30a4\u30c0\u306e\u898f\u5236\u5f37\u5316\u3067\u3001\u7121\u5dee\u5225\u5927\u91cf\u578b\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u306f\u6e1b\u5c11<\/strong><br\/>\n\u2192 \u3057\u304b\u3057\u3053\u308c\u306f\u300c\u653b\u6483\u8005\u304c\u91cf\u3088\u308a\u8cea\u306b\u5207\u308a\u66ff\u3048\u305f\u300d\u3053\u3068\u3092\u610f\u5473\u3059\u308b<\/li>\n<li>\u2714 <strong>AI\u751f\u6210\u306e\u81ea\u7136\u306a\u6587\u7ae0\u30fb\u7cbe\u5de7\u306a\u30c9\u30e1\u30a4\u30f3\u507d\u88c5\u30fb\u30c1\u30e3\u30c3\u30c8\u8a98\u5c0e\u578b<\/strong><br\/>\n\u2192 \u6280\u8853\u30d5\u30a3\u30eb\u30bf\u3092\u3059\u308a\u629c\u3051\u3066\u4eba\u306e\u5224\u65ad\u3092\u72c2\u308f\u305b\u308b\u3053\u3068\u304c\u76ee\u7684<\/li>\n<li>\u2714 <strong>\u300c\u6e1b\u3063\u305f\u304b\u3089\u5b89\u5fc3\u300d\u3067\u306f\u306a\u304f\u300c\u6b8b\u3063\u305f1\u901a\u304c\u5371\u967a\u300d<\/strong><br\/>\n\u2192 \u6280\u8853\u30fb\u904b\u7528\u30fb\u7d44\u7e54\u6587\u5316\u306e\u4e09\u5c64\u5bfe\u7b56\u304c\u4e0d\u53ef\u6b20<\/li>\n<\/ul>\n<\/div>\n\n<div class=\"warning-box\">\n<p><strong>\ud83d\udca1 \u6700\u3082\u91cd\u8981\u306a\u3053\u3068<\/strong><\/p>\n<p>\n<strong>\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u6e1b\u3063\u305f\u300d\u306f\u653b\u6483\u8005\u306e\u6226\u7565\u5909\u66f4\u306e\u30b5\u30a4\u30f3\u3067\u3059\u3002<\/strong><br\/>\n\u91cf\u304c\u6e1b\u3063\u305f\u3053\u3068\u306b\u5b89\u5835\u305b\u305a\u3001\u6b8b\u3063\u305f\u653b\u6483\u30e1\u30fc\u30eb\u306e\u300c\u8cea\u300d\u306b\u76ee\u3092\u5411\u3051\u308b\u3053\u3068\u304c\u3001<br\/>\n\u4eca\u6700\u3082\u5fc5\u8981\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u610f\u8b58\u306e\u8ee2\u63db\u3067\u3059\u3002\n<\/p>\n<\/div>\n\n<p>\n\u6c17\u306b\u306a\u308b\u70b9\u304c\u3042\u308c\u3070\u3001<br\/>\n\u500b\u5225\u306b\u72b6\u6cc1\u3092\u4f3a\u3044\u306a\u304c\u3089\u306e\u3054\u76f8\u8ac7\u3082\u53ef\u80fd\u3067\u3059\u3002<br\/>\n\u304a\u6c17\u8efd\u306b\u3054\u9023\u7d61\u304f\u3060\u3055\u3044\u3002\n<\/p>\n\n<p>\n\u672c\u65e5\u3082\u3001\u3069\u3046\u305e\u5b89\u5168\u306a\u4e00\u65e5\u3092\u304a\u904e\u3054\u3057\u304f\u3060\u3055\u3044\u3002\n<\/p>\n\n<h3>\u25a0 \u53c2\u8003\u60c5\u5831<\/h3>\n\n<ul>\n<li><a href=\"https:\/\/support.google.com\/a\/answer\/14229414?hl=ja\" target=\"_blank\">Google \u30e1\u30fc\u30eb\u9001\u4fe1\u8005\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff08\u516c\u5f0f\uff09<\/a><\/li>\n<li><a href=\"https:\/\/knowledge.brandkeeper.jp\/dmarc\/1778\/\" target=\"_blank\">Microsoft Outlook DMARC\u8981\u4ef6\uff082025\u5e745\u6708\u301c\uff09<\/a><\/li>\n<li><a href=\"https:\/\/maildata.jp\/blog\/blog-2025-01-24.html\" target=\"_blank\">Yahoo! Japan DMARC\u5bfe\u5fdc\u306e\u63a8\u79fb<\/a><\/li>\n<li><a href=\"https:\/\/powerdmarc.com\/ja\/email-phishing-dmarc-statistics\/\" target=\"_blank\">PowerDMARC\uff1a2025\u5e74\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u7d71\u8a08<\/a><\/li>\n<li><a href=\"https:\/\/www.ipa.go.jp\/security\/bec\/index.html\" target=\"_blank\">IPA\uff1a\u30d3\u30b8\u30cd\u30b9\u30e1\u30fc\u30eb\u8a50\u6b3a\uff08BEC\uff09\u5bfe\u7b56<\/a><\/li>\n<\/ul>\n\n<p class=\"note-text\">\n\u203b2026\u5e742\u6708\u6642\u70b9\u306e\u60c5\u5831\u3067\u3059\u3002<br\/>\n\u6700\u65b0\u60c5\u5831\u306f\u5404\u516c\u5f0f\u30b5\u30a4\u30c8\u3067\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n<\/p>\n\n\n\n\n\n<hr style=\"border: none; border-top: 1px solid #E5E7EB; margin: 3em 0;\"\/>\n\n<p>\n\u6700\u5f8c\u307e\u3067\u304a\u8aad\u307f\u3044\u305f\u3060\u304d\u3001\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002\n<\/p>\n\n<p>\n\u5f0a\u793e\u306e\u793e\u540d\u3068\u306a\u3063\u3066\u3044\u308b\u300c\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9\u300d\u306f\u3001<br\/>\n\u300c\u56de\u5fa9\u529b\u300d\u3084\u300c\u5f3e\u6027\u300d\u3092\u610f\u5473\u3059\u308b\u82f1\u5358\u8a9e\u3067\u3059\u3002\n<\/p>\n\n<p>\n\u3064\u307e\u308a\u3001\u74b0\u5883\u306e\u5909\u5316\u3084\u7a81\u767a\u7684\u306a\u4e8b\u8c61\u306b\u5bfe\u3057\u3066<br\/>\n\u3057\u306a\u3084\u304b\u306b\u7c98\u308a\u5f37\u304f\u5bfe\u5fdc\u3057\u3066\u3044\u304f<br\/>\n\u7acb\u3061\u4f4d\u7f6e\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002\n<\/p>\n\n<p>\n\u76ee\u307e\u3050\u308b\u3057\u304f\u5909\u5316\u3059\u308b\u6642\u6d41\u306e\u4e2d\u3067\u3001<br\/>\n\u305d\u308c\u3092\u898b\u6975\u3081\u3064\u3064\u6d41\u3055\u308c\u306a\u3044\u89e3\u6c7a\u7b56\u3092\u63d0\u6848\u81f4\u3057\u307e\u3059\u3002\n<\/p>\n\n<p style=\"font-size: 0.9em; 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