{"id":746,"date":"2026-05-01T15:30:00","date_gmt":"2026-05-01T06:30:00","guid":{"rendered":"https:\/\/www.meruhaikun.com\/blog\/?p=746"},"modified":"2026-05-01T16:37:06","modified_gmt":"2026-05-01T07:37:06","slug":"%e3%82%ad%e3%83%a3%e3%83%aa%e3%82%a2%e3%83%a1%e3%83%bc%e3%83%ab%e3%81%ab%e3%83%a1%e3%83%bc%e3%83%ab%e3%81%8c%e5%b1%8a%e3%81%8b%e3%81%aa%e3%81%84%e5%8e%9f%e5%9b%a0%e3%81%a8%e3%81%af%ef%bc%9f%e3%82%ad","status":"publish","type":"post","link":"https:\/\/www.meruhaikun.com\/blog\/?p=746","title":{"rendered":"\u30102026\u5e74\u6700\u65b0\u3011\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u3044\u539f\u56e0\u3068\u5bfe\u7b56\uff5cdocomo\u30fbau\u30fbsoftbank\u5225\u306b\u89e3\u8aac"},"content":{"rendered":"\n<!-- ============================================================\n     \u3081\u308b\u914d\u304f\u3093\u30d6\u30ed\u30b0 2026\u5e74\u7248\u30ea\u30e9\u30a4\u30c8\u8a18\u4e8b\n     WordPress\u300c\u30ab\u30b9\u30bf\u30e0HTML\u300d\u30d6\u30ed\u30c3\u30af\u306b\u305d\u306e\u307e\u307e\u8cbc\u308a\u4ed8\u3051\u3066\u3054\u5229\u7528\u304f\u3060\u3055\u3044\n     ============================================================ -->\n\n<style>\n.mh26-wrap {\n  font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;\n  font-size: 16px;\n  line-height: 1.9;\n  color: #333;\n  max-width: 860px;\n  margin: 0 auto;\n}\n.mh26-wrap * { box-sizing: border-box; }\n\n\/* \u30ea\u30fc\u30c9\u6587\u30dc\u30c3\u30af\u30b9 *\/\n.mh26-lead-box {\n  background: #f0f7ff;\n  border-left: 5px solid #0070c0;\n  border-radius: 4px;\n  padding: 20px 24px;\n  margin: 24px 0 32px;\n}\n.mh26-lead-box ul {\n  margin: 8px 0 0;\n  padding-left: 1.4em;\n}\n.mh26-lead-box li {\n  margin-bottom: 6px;\n  color: #1a4a80;\n  font-weight: 500;\n}\n\n\/* \u76ee\u6b21 *\/\n.mh26-toc {\n  background: #fafafa;\n  border: 1px solid #dde6f0;\n  border-radius: 8px;\n  padding: 20px 28px;\n  margin: 32px 0;\n}\n.mh26-toc-title {\n  font-size: 15px;\n  font-weight: 700;\n  color: #0070c0;\n  margin: 0 0 10px;\n  letter-spacing: 0.05em;\n}\n.mh26-toc ol {\n  margin: 0;\n  padding-left: 1.5em;\n}\n.mh26-toc li {\n  margin-bottom: 4px;\n  font-size: 14px;\n}\n.mh26-toc a {\n  color: #1a4a80;\n  text-decoration: none;\n}\n.mh26-toc a:hover { text-decoration: underline; }\n\n\/* \u898b\u51fa\u3057H2 *\/\n.mh26-wrap h2 {\n  font-size: 22px;\n  font-weight: 700;\n  color: #1f3864;\n  border-bottom: 3px solid #0070c0;\n  padding-bottom: 8px;\n  margin: 48px 0 20px;\n}\n\n\/* \u898b\u51fa\u3057H3 *\/\n.mh26-wrap h3 {\n  font-size: 18px;\n  font-weight: 700;\n  color: #1f3864;\n  border-left: 4px solid #0070c0;\n  padding-left: 12px;\n  margin: 32px 0 14px;\n}\n\n\/* \u898b\u51fa\u3057H4 *\/\n.mh26-wrap h4 {\n  font-size: 16px;\n  font-weight: 700;\n  color: #0070c0;\n  margin: 24px 0 10px;\n}\n\n\/* \u6ce8\u76ee\u30d0\u30c3\u30b8\u4ed8\u304d\u898b\u51fa\u3057 *\/\n.mh26-badge {\n  display: inline-block;\n  background: #c00000;\n  color: #fff;\n  font-size: 12px;\n  font-weight: 700;\n  padding: 2px 8px;\n  border-radius: 3px;\n  margin-right: 8px;\n  vertical-align: middle;\n  position: relative;\n  top: -2px;\n}\n.mh26-badge-new {\n  background: #0070c0;\n}\n\n\/* \u901a\u5e38\u30ea\u30b9\u30c8 *\/\n.mh26-wrap ul.mh26-list {\n  padding-left: 0;\n  list-style: none;\n  margin: 12px 0 20px;\n}\n.mh26-wrap ul.mh26-list li {\n  padding: 6px 0 6px 28px;\n  position: relative;\n  border-bottom: 1px dashed #e0e8f0;\n}\n.mh26-wrap ul.mh26-list li:last-child { border-bottom: none; }\n.mh26-wrap ul.mh26-list li::before {\n  content: \"\u25cf\";\n  color: #0070c0;\n  position: absolute;\n  left: 4px;\n  font-size: 10px;\n  top: 10px;\n}\n\n\/* \u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8 *\/\n.mh26-wrap ul.mh26-check {\n  padding-left: 0;\n  list-style: none;\n  margin: 12px 0 20px;\n}\n.mh26-wrap ul.mh26-check li {\n  padding: 7px 0 7px 32px;\n  position: relative;\n  border-bottom: 1px solid #eef4fb;\n}\n.mh26-wrap ul.mh26-check li:last-child { border-bottom: none; }\n.mh26-wrap ul.mh26-check li::before {\n  content: \"\u2714\";\n  color: #00a050;\n  position: absolute;\n  left: 4px;\n  font-weight: 700;\n}\n\n\/* \u6ce8\u76ee\u30dc\u30c3\u30af\u30b9\uff08\u91cd\u8981\uff09 *\/\n.mh26-alert {\n  background: #fff4f4;\n  border: 2px solid #c00000;\n  border-radius: 6px;\n  padding: 16px 20px;\n  margin: 20px 0;\n  font-weight: 700;\n  color: #c00000;\n}\n.mh26-alert::before {\n  content: \"\u26a0 \";\n}\n\n\/* \u30a4\u30f3\u30d5\u30a9\u30dc\u30c3\u30af\u30b9 *\/\n.mh26-info {\n  background: #f0f7ff;\n  border: 1px solid #b0d0ef;\n  border-radius: 6px;\n  padding: 16px 20px;\n  margin: 20px 0;\n  font-size: 15px;\n  color: #1a4a80;\n}\n\n\/* \u6ce8\u8a18 *\/\n.mh26-note {\n  font-size: 13px;\n  color: #888;\n  font-style: italic;\n  margin: 8px 0 16px;\n  padding-left: 12px;\n  border-left: 2px solid #ccc;\n}\n\n\/* 3\u30ab\u30e9\u30e0\u6280\u8853\u89e3\u8aac\u30b0\u30ea\u30c3\u30c9 *\/\n.mh26-tech-grid {\n  display: flex;\n  gap: 16px;\n  margin: 20px 0;\n  flex-wrap: wrap;\n}\n.mh26-tech-card {\n  flex: 1;\n  min-width: 200px;\n  background: #fff;\n  border: 1px solid #b0d0ef;\n  border-top: 4px solid #0070c0;\n  border-radius: 6px;\n  padding: 16px;\n}\n.mh26-tech-card h5 {\n  margin: 0 0 8px;\n  font-size: 16px;\n  color: #0070c0;\n  font-weight: 700;\n}\n.mh26-tech-card p {\n  margin: 0;\n  font-size: 14px;\n  line-height: 1.7;\n  color: #444;\n}\n\n\/* \u30c8\u30ec\u30f3\u30c9\u30ab\u30fc\u30c9 *\/\n.mh26-trend {\n  background: #fff;\n  border: 1px solid #dde6f0;\n  border-radius: 8px;\n  padding: 20px 24px;\n  margin: 20px 0;\n  border-left: 6px solid #0070c0;\n}\n.mh26-trend-label {\n  font-size: 13px;\n  color: #0070c0;\n  font-weight: 700;\n  letter-spacing: 0.06em;\n  margin-bottom: 6px;\n}\n.mh26-trend h3 {\n  border: none;\n  padding: 0;\n  margin: 0 0 10px;\n  font-size: 17px;\n  color: #1f3864;\n}\n\n\/* CTA\u30dc\u30c3\u30af\u30b9 *\/\n.mh26-cta {\n  background: linear-gradient(135deg, #0070c0 0%, #004d8f 100%);\n  border-radius: 10px;\n  padding: 32px 28px;\n  text-align: center;\n  margin: 48px 0 24px;\n  color: #fff;\n}\n.mh26-cta p {\n  margin: 0 0 20px;\n  font-size: 17px;\n  line-height: 1.7;\n  color: #fff;\n}\n.mh26-cta a.mh26-btn {\n  display: inline-block;\n  background: #fff;\n  color: #0070c0;\n  font-weight: 700;\n  font-size: 16px;\n  padding: 14px 36px;\n  border-radius: 50px;\n  text-decoration: none;\n  box-shadow: 0 4px 12px rgba(0,0,0,0.2);\n  transition: transform 0.2s;\n}\n.mh26-cta a.mh26-btn:hover { transform: translateY(-2px); }\n\n\/* \u307e\u3068\u3081\u30dc\u30c3\u30af\u30b9 *\/\n.mh26-summary {\n  background: #f0f7ff;\n  border: 2px solid #0070c0;\n  border-radius: 8px;\n  padding: 24px 28px;\n  margin: 40px 0;\n}\n.mh26-summary-title {\n  font-size: 18px;\n  font-weight: 700;\n  color: #0070c0;\n  margin: 0 0 14px;\n}\n\n\/* \u30ad\u30e3\u30ea\u30a2\u8a2d\u5b9a\u30c6\u30fc\u30d6\u30eb *\/\n.mh26-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 16px 0 24px;\n  font-size: 15px;\n}\n.mh26-table th {\n  background: #0070c0;\n  color: #fff;\n  padding: 10px 14px;\n  text-align: left;\n  font-weight: 700;\n}\n.mh26-table td {\n  padding: 10px 14px;\n  border-bottom: 1px solid #dde6f0;\n  vertical-align: top;\n}\n.mh26-table tr:nth-child(even) td { background: #f5f9ff; }\n\n\/* \u533a\u5207\u308a *\/\n.mh26-divider {\n  border: none;\n  border-top: 1px solid #dde6f0;\n  margin: 40px 0;\n}\n\n\/* \u516c\u958b\u65e5 *\/\n.mh26-meta {\n  font-size: 13px;\n  color: #999;\n  text-align: right;\n  margin-top: 32px;\n}\n<\/style>\n\n<div class=\"mh26-wrap\">\n\n  <!-- ======== \u30ea\u30fc\u30c9 ======== -->\n  <div class=\"mh26-lead-box\">\n    <strong>\u3053\u3093\u306a\u304a\u60a9\u307f\u3092\u304a\u6301\u3061\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/strong>\n    <ul>\n      <li>\u9867\u5ba2\u304b\u3089\u300c\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u3044\u300d\u3068\u3044\u3046\u554f\u3044\u5408\u308f\u305b\u304c\u5897\u3048\u3066\u3044\u308b<\/li>\n      <li>\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3078\u306e\u5230\u9054\u7387\u304c\u4f4e\u304f\u3001\u539f\u56e0\u304c\u5206\u304b\u3089\u306a\u3044<\/li>\n      <li>\u30b9\u30c6\u30c3\u30d7\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u30ba\u30ec\u3066\u56f0\u3063\u3066\u3044\u308b<\/li>\n      <li>2025\u301c2026\u5e74\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316\u306b\u81ea\u793e\u304c\u5bfe\u5fdc\u3067\u304d\u3066\u3044\u308b\u304b\u4e0d\u5b89<\/li>\n    <\/ul>\n  <\/div>\n\n  <p>\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306e\u666e\u53ca\u7387\u304c9\u5272\u3092\u8d85\u3048\u305f\u73fe\u5728\u3001Gmail\u3084Yahoo!\u30e1\u30fc\u30eb\u3092\u4f7f\u3046\u30e6\u30fc\u30b6\u30fc\u304c\u5897\u3048\u308b\u4e00\u65b9\u3067\u3001\u30ad\u30e3\u30ea\u30a2\u9593\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u6301\u3061\u904b\u3073\uff08\u30ca\u30f3\u30d0\u30fc\u30dd\u30fc\u30bf\u30d3\u30ea\u30c6\u30a3\uff09\u304c\u5b9a\u7740\u3057\u305f\u3053\u3068\u3067\u3001\u4f7f\u3044\u6163\u308c\u305f\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3092\u7d99\u7d9a\u3057\u3066\u4f7f\u3046\u30e6\u30fc\u30b6\u30fc\u3082\u4f9d\u7136\u3068\u3057\u3066\u591a\u304f\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n  <p>\u3055\u3089\u306b<strong>2025\u301c2026\u5e74\u306b\u304b\u3051\u3066\u3001\u5404\u30ad\u30e3\u30ea\u30a2\u306f\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\uff08SPF\u30fbDKIM\u30fbDMARC\uff09\u3078\u306e\u5bfe\u5fdc\u5f37\u5316\u3084\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u306e\u53b3\u683c\u5316\u3092\u4e00\u5c64\u9032\u3081\u3066\u304a\u308a<\/strong>\u3001\u914d\u4fe1\u8005\u5074\u306e\u5bfe\u7b56\u304c\u8ffd\u3044\u3064\u3044\u3066\u3044\u306a\u3044\u30b1\u30fc\u30b9\u304c\u5897\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n\n  <p>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u3044\u539f\u56e0\u3068\u30012026\u5e74\u6642\u70b9\u3067\u53d6\u308b\u3079\u304d\u6700\u65b0\u306e\u5bfe\u7b56\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n  <!-- ======== \u76ee\u6b21 ======== -->\n  <div class=\"mh26-toc\">\n    <p class=\"mh26-toc-title\">\ud83d\udccb \u76ee\u6b21<\/p>\n    <ol>\n      <li><a href=\"#mh-basic\">\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306e\u57fa\u790e\u77e5\u8b58<\/a><\/li>\n      <li><a href=\"#mh-trend\">\u30102025\u301c2026\u5e74\u30c8\u30ec\u30f3\u30c9\u3011\u30ad\u30e3\u30ea\u30a2\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316<\/a><\/li>\n      <li><a href=\"#mh-cause\">\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u30444\u3064\u306e\u539f\u56e0<\/a><\/li>\n      <li><a href=\"#mh-solution\">\u5230\u9054\u7387\u3092\u4e0a\u3052\u308b5\u3064\u306e\u5bfe\u7b56\u30102026\u5e74\u7248\u3011<\/a><\/li>\n      <li><a href=\"#mh-service\">\u3081\u308b\u914d\u304f\u3093\u306e\u53d6\u308a\u7d44\u307f<\/a><\/li>\n      <li><a href=\"#mh-summary\">\u307e\u3068\u3081<\/a><\/li>\n    <\/ol>\n  <\/div>\n\n  <!-- ======== 1. \u57fa\u790e\u77e5\u8b58 ======== -->\n  <h2 id=\"mh-basic\">\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n  <p>\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3068\u306f\u3001\u643a\u5e2f\u96fb\u8a71\u306e\u901a\u4fe1\u4e8b\u696d\u8005\uff08\u30ad\u30e3\u30ea\u30a2\uff09\u304c\u63d0\u4f9b\u3059\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u3067\u3059\u30022026\u5e74\u73fe\u5728\u3001\u4e3b\u306a\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n  <table class=\"mh26-table\">\n    <thead>\n      <tr><th>\u30ad\u30e3\u30ea\u30a2 \/ \u30d6\u30e9\u30f3\u30c9<\/th><th>\u30c9\u30e1\u30a4\u30f3<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr><td>NTT\u30c9\u30b3\u30e2<\/td><td>@docomo.ne.jp<\/td><\/tr>\n      <tr><td>au<\/td><td>@ezweb.ne.jp \/ @au.com<\/td><\/tr>\n      <tr><td>\u30bd\u30d5\u30c8\u30d0\u30f3\u30af<\/td><td>@softbank.ne.jp<\/td><\/tr>\n      <tr><td>UQ mobile\uff08au\u30b5\u30d6\u30d6\u30e9\u30f3\u30c9\uff09<\/td><td>@uqmobile.jp<\/td><\/tr>\n      <tr><td>\u30ef\u30a4\u30e2\u30d0\u30a4\u30eb\uff08\u30bd\u30d5\u30c8\u30d0\u30f3\u30af\u30b5\u30d6\u30d6\u30e9\u30f3\u30c9\uff09<\/td><td>@ymobile.ne.jp<\/td><\/tr>\n      <tr><td>\u697d\u5929\u30e2\u30d0\u30a4\u30eb<\/td><td>@rakuten.jp<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n\n  <p>\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u3067\u306e\u4fe1\u983c\u6027\u304c\u9ad8\u304f\u3001\u7aef\u672b\u56fa\u6709\u306e\u30b5\u30fc\u30d3\u30b9\u3068\u3057\u3066\u9577\u5e74\u89aa\u3057\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u305d\u306e\u5206\u3001<strong>\u8ff7\u60d1\u30e1\u30fc\u30eb\u5bfe\u7b56\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3082\u975e\u5e38\u306b\u5f37\u529b\u3067\u3001\u6b63\u898f\u306e\u914d\u4fe1\u30e1\u30fc\u30eb\u304c\u5f3e\u304b\u308c\u3066\u3057\u307e\u3046\u30b1\u30fc\u30b9<\/strong>\u304c\u5f8c\u3092\u7d76\u3061\u307e\u305b\u3093\u3002<\/p>\n\n  <!-- ======== 2. 2025-2026\u5e74\u30c8\u30ec\u30f3\u30c9 ======== -->\n  <h2 id=\"mh-trend\">\u30102025\u301c2026\u5e74\u30c8\u30ec\u30f3\u30c9\u3011\u30ad\u30e3\u30ea\u30a2\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316<\/h2>\n\n  <p>2025\u5e74\u304b\u30892026\u5e74\u306b\u304b\u3051\u3066\u3001\u5404\u30ad\u30e3\u30ea\u30a2\u304a\u3088\u3073\u4e3b\u8981\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u5fdc\u304c\u5927\u5e45\u306b\u5f37\u5316\u3055\u308c\u307e\u3057\u305f\u3002\u914d\u4fe1\u62c5\u5f53\u8005\u306f\u4ee5\u4e0b\u306e\u52d5\u5411\u3092\u5fc5\u305a\u628a\u63e1\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n  <div class=\"mh26-trend\">\n    <p class=\"mh26-trend-label\">\ud83d\udd14 \u6700\u65b0\u60c5\u5831 \u2460 \u30c9\u30b3\u30e2\u30e1\u30fc\u30eb\uff082025\u5e742\u6708\u301c\uff09<\/p>\n    <h3>\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u300d\u5c0e\u5165\u3068DMARC\u9694\u96e2\u30dd\u30ea\u30b7\u30fc\u5bfe\u5fdc<\/h3>\n    <p>2025\u5e742\u670813\u65e5\u3088\u308a\u3001NTT\u30c9\u30b3\u30e2\u306f\u300c\u30c9\u30b3\u30e2\u30e1\u30fc\u30eb\u300d\u306b<strong>\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u300d\u3092\u65b0\u8a2d<\/strong>\u3057\u307e\u3057\u305f\u3002\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\uff08DMARC\uff09\u306e\u300c\u9694\u96e2\uff08quarantine\uff09\u300d\u30dd\u30ea\u30b7\u30fc\u306b\u8a72\u5f53\u3059\u308b\u30e1\u30fc\u30eb\u304c\u3001\u53d7\u4fe1\u30dc\u30c3\u30af\u30b9\u3067\u306f\u306a\u304f\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u3078\u81ea\u52d5\u632f\u308a\u5206\u3051\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n    <ul class=\"mh26-check\">\n      <li>SPF\u30fbDKIM\u30fbDMARC\u306e3\u3064\u3059\u3079\u3066\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u306a\u3044\u3068\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u3078\u632f\u308a\u5206\u3051\u3089\u308c\u308b\u30ea\u30b9\u30af\u304c\u5927\u5e45\u306b\u9ad8\u307e\u308b<\/li>\n      <li>\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306b\u5165\u3063\u305f\u30e1\u30fc\u30eb\u306f<strong>\u53d7\u4fe1\u304b\u308930\u65e5\u5f8c\u306b\u81ea\u52d5\u524a\u9664<\/strong>\u3055\u308c\u308b<\/li>\n      <li>\u5f93\u6765\u306f\u53d7\u4fe1\u62d2\u5426\u3055\u308c\u3066\u3044\u305f\u8a8d\u8a3c\u30e1\u30fc\u30eb\u304c\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u3067\u53d7\u3051\u53d6\u308c\u308b\u30e1\u30ea\u30c3\u30c8\u3082\u3042\u308b<\/li>\n    <\/ul>\n  <\/div>\n\n  <div class=\"mh26-trend\">\n    <p class=\"mh26-trend-label\">\ud83d\udd14 \u6700\u65b0\u60c5\u5831 \u2461 Gmail\u30fbOutlook\uff082024\u5e74\u301c\u7d99\u7d9a\uff09<\/p>\n    <h3>\u5927\u91cf\u9001\u4fe1\u8005\u3078\u306e\u8a8d\u8a3c\u7fa9\u52d9\u5316\u304c\u7d99\u7d9a\u5f37\u5316<\/h3>\n    <p>Google\u306f2024\u5e742\u6708\u3088\u308a\u30011\u65e55,000\u901a\u4ee5\u4e0a\u9001\u4fe1\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066SPF\u30fbDKIM\u30fbDMARC\u306e\u8a2d\u5b9a\u3092\u5fc5\u9808\u5316\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u3001Microsoft\u306eOutlook.com\u30fbHotmail\u30fbLive\u5b9b\u3066\u306e\u914d\u4fe1\u306b\u3064\u3044\u3066\u3082\u3001<strong>2025\u5e745\u67085\u65e5\u304b\u3089\u540c\u69d8\u306e\u9001\u4fe1\u8005\u8981\u4ef6\u306e\u9069\u7528\u3092\u958b\u59cb<\/strong>\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u4eca\u3082\u306a\u304a\u7d99\u7d9a\u30fb\u5f37\u5316\u3055\u308c\u3066\u304a\u308a\u3001\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3078\u306e\u914d\u4fe1\u306b\u3082\u5f71\u97ff\u304c\u51fa\u3066\u3044\u307e\u3059\u3002<\/p>\n  <\/div>\n\n  <div class=\"mh26-trend\">\n    <p class=\"mh26-trend-label\">\ud83d\udd14 \u6700\u65b0\u60c5\u5831 \u2462 \u696d\u754c\u5168\u4f53\uff08JPAAWG\uff09<\/p>\n    <h3>\u696d\u754c\u6a2a\u65ad\u3067\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u5bfe\u7b56\u6a19\u6e96\u5316\u304c\u9032\u3080<\/h3>\n    <p>\u65e5\u672c\u8ff7\u60d1\u30e1\u30fc\u30eb\u5bfe\u7b56\u30ef\u30fc\u30ad\u30f3\u30b0\u30b0\u30eb\u30fc\u30d7\uff08JPAAWG\uff09\u304c\u56fd\u5185ISP\u30fb\u30ad\u30e3\u30ea\u30a2\u30fb\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u4e8b\u696d\u8005\u3068\u9023\u643a\u3057\u3001\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\u306e\u666e\u53ca\u3092\u63a8\u9032\u3057\u3066\u3044\u307e\u3059\u30022025\u5e7411\u6708\u306b\u306f\u7b2c8\u56deGeneral Meeting\u304c\u958b\u50ac\u3055\u308c\u3001\u696d\u754c\u5168\u4f53\u3067\u306e\u5bfe\u7b56\u5f37\u5316\u304c\u7d9a\u3044\u3066\u3044\u307e\u3059\u3002\u4eca\u5f8c\u3082\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u5f37\u5316\u306b\u76f4\u7d50\u3059\u308b\u52d5\u304d\u3067\u3059\u3002<\/p>\n  <\/div>\n\n  <!-- ======== 3. \u5c4a\u304b\u306a\u3044\u539f\u56e0 ======== -->\n  <h2 id=\"mh-cause\">\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u30444\u3064\u306e\u539f\u56e0<\/h2>\n\n  <ul class=\"mh26-list\">\n    <li><strong>\u2460 \u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u30fc\u306b\u3088\u308b\u632f\u308a\u5206\u3051\u30fb\u30d6\u30ed\u30c3\u30af<\/strong><\/li>\n    <li><strong>\u2461 \u30ad\u30e3\u30ea\u30a2\u30d6\u30ed\u30c3\u30af\uff08\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u904e\u591a\u306b\u3088\u308b\u914d\u4fe1\u9045\u5ef6\u30fb\u62d2\u5426\uff09<\/strong><\/li>\n    <li><strong>\u2462 \u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\uff08SPF\u30fbDKIM\u30fbDMARC\uff09\u306e\u672a\u8a2d\u5b9a\u30fb\u8a2d\u5b9a\u30df\u30b9<\/strong><\/li>\n    <li><strong>\u2463 RFC\u898f\u683c\u306b\u9055\u53cd\u3057\u305f\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u4f7f\u7528<\/strong><\/li>\n  <\/ul>\n\n  <h3>\u539f\u56e0\u2460 \u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u30fc\u306b\u3088\u308b\u632f\u308a\u5206\u3051\u30fb\u30d6\u30ed\u30c3\u30af<\/h3>\n  <p>\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306f\u521d\u671f\u8a2d\u5b9a\u306e\u6bb5\u968e\u304b\u3089\u5f37\u529b\u306a\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30d1\u30bd\u30b3\u30f3\uff08\u5916\u90e8\u30b5\u30fc\u30d0\u30fc\uff09\u304b\u3089\u9001\u4fe1\u3055\u308c\u308b\u30e1\u30fc\u30eb\u306f\u3001\u30b9\u30d1\u30e0\u3068\u306e\u898b\u5206\u3051\u304c\u3064\u304d\u306b\u304f\u3044\u305f\u3081\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u307b\u307c\u30d6\u30ed\u30c3\u30af\u307e\u305f\u306f\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u3078\u632f\u308a\u5206\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n  <p>2025\u5e742\u6708\u306e\u30c9\u30b3\u30e2\u30e1\u30fc\u30eb\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306b\u3088\u308a\u3001DMARC\u306e\u300c\u9694\u96e2\u300d\u30dd\u30ea\u30b7\u30fc\u306b\u8a72\u5f53\u3059\u308b\u30e1\u30fc\u30eb\u304c\u81ea\u52d5\u3067\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u3078\u632f\u308a\u5206\u3051\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<strong>\u8a8d\u8a3c\u304c\u4e0d\u5341\u5206\u306a\u30e1\u30fc\u30eb\u306f\u3053\u308c\u307e\u3067\u4ee5\u4e0a\u306b\u5c4a\u304d\u306b\u304f\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/strong><\/p>\n\n  <h3>\u539f\u56e0\u2461 \u30ad\u30e3\u30ea\u30a2\u30d6\u30ed\u30c3\u30af\uff08\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u904e\u591a\uff09<\/h3>\n  <p>\u4e00\u6589\u914d\u4fe1\u306e\u969b\u3001\u914d\u4fe1\u30ea\u30b9\u30c8\u306b\u7121\u52b9\u306a\u30a2\u30c9\u30ec\u30b9\uff08\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\uff09\u304c\u591a\u304f\u542b\u307e\u308c\u3066\u3044\u308b\u3068\u3001\u30ad\u30e3\u30ea\u30a2\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u30b9\u30d1\u30e0\u9001\u4fe1\u3068\u5224\u65ad\u3057\u3001<strong>\u6709\u52b9\u306a\u30a2\u30c9\u30ec\u30b9\u3078\u306e\u30e1\u30fc\u30eb\u307e\u3067\u307e\u3068\u3081\u3066\u30d6\u30ed\u30c3\u30af\u30fb\u9045\u5ef6<\/strong>\u3055\u305b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u653e\u7f6e\u3057\u3066\u3044\u308b\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u304c\u84c4\u7a4d\u3059\u308b\u307b\u3069\u30ea\u30b9\u30af\u306f\u9ad8\u307e\u308a\u307e\u3059\u3002\u30b9\u30c6\u30c3\u30d7\u30e1\u30fc\u30eb\u306a\u3069\u914d\u4fe1\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u91cd\u8981\u306a\u5834\u5408\u306f\u7279\u306b\u81f4\u547d\u7684\u306a\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n  <h3>\u539f\u56e0\u2462 \u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u672a\u8a2d\u5b9a\u30fb\u8a2d\u5b9a\u30df\u30b9 <span class=\"mh26-badge\">2026\u5e74\u6700\u91cd\u8981<\/span><\/h3>\n  <p>2024\u5e74\u4ee5\u964d\u3001\u5404\u30ad\u30e3\u30ea\u30a2\u304a\u3088\u3073Gmail\u30fbOutlook\u304c\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3078\u306e\u5bfe\u5fdc\u3092\u5f37\u5316\u3057\u3066\u304a\u308a\u3001\u672a\u8a2d\u5b9a\u306e\u307e\u307e\u914d\u4fe1\u3092\u7d9a\u3051\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u30ea\u30b9\u30af\u304c\u9ad8\u3044\u72b6\u614b\u3067\u3059\u3002\u4e3b\u306b\u4ee5\u4e0b\u306e3\u3064\u306e\u6280\u8853\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n  <div class=\"mh26-tech-grid\">\n    <div class=\"mh26-tech-card\">\n      <h5>SPF<\/h5>\n      <p>\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u304c\u6b63\u898f\u306e\u3082\u306e\u304b\u3092DNS\u3067\u691c\u8a3c\u3059\u308b\u6280\u8853\u3002\u666e\u53ca\u7387\u306f\u7d049\u5272\u3068\u9ad8\u304f\u3001\u6700\u4f4e\u9650\u5fc5\u9808\u306e\u8a2d\u5b9a\u3002<\/p>\n    <\/div>\n    <div class=\"mh26-tech-card\">\n      <h5>DKIM<\/h5>\n      <p>\u30e1\u30fc\u30eb\u306b\u96fb\u5b50\u7f72\u540d\u3092\u4ed8\u4e0e\u3057\u3001\u5185\u5bb9\u306e\u6539\u3056\u3093\u304c\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3002\u8a2d\u5b9a\u306bDNS\u7de8\u96c6\u306e\u77e5\u8b58\u304c\u5fc5\u8981\u3067\u666e\u53ca\u7387\u306f4\u5272\u53f0\u306b\u3068\u3069\u307e\u308b\u3002<\/p>\n    <\/div>\n    <div class=\"mh26-tech-card\">\n      <h5>DMARC<\/h5>\n      <p>SPF\u30fbDKIM\u3092\u7d71\u5408\u3057\u3001\u8a8d\u8a3c\u5931\u6557\u6642\u306e\u51e6\u7406\u65b9\u91dd\uff08none\uff0fquarantine\uff0freject\uff09\u3092\u5b9a\u3081\u308b\u3002\u30c9\u30b3\u30e2\u30e1\u30fc\u30eb\u306f2025\u5e742\u6708\u3088\u308aquarantine\u30dd\u30ea\u30b7\u30fc\u306b\u6e96\u62e0\u6e08\u307f\u3002<\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"mh26-alert\">\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3078\u306e\u914d\u4fe1\u3067\u306f\u3001SPF\u306e\u307f\u306e\u5bfe\u5fdc\u3067\u306f\u4e0d\u5341\u5206\u306a\u30b1\u30fc\u30b9\u304c\u6025\u5897\u3057\u3066\u3044\u307e\u3059\u3002SPF\u30fbDKIM\u30fbDMARC\u306e3\u3064\u3059\u3079\u3066\u306e\u8a2d\u5b9a\u304c\u5f37\u304f\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/div>\n\n  <h3>\u539f\u56e0\u2463 RFC\u898f\u683c\u9055\u53cd\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9<\/h3>\n  <p>\u30c9\u30c3\u30c8\uff08.\uff09\u3092\u9023\u7d9a\u4f7f\u7528\u3057\u305f\u308a\u3001@\u30de\u30fc\u30af\u76f4\u524d\u306b\u30c9\u30c3\u30c8\u3092\u7f6e\u304f\u306a\u3069RFC\u898f\u683c\u306b\u9055\u53cd\u3057\u305f\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u643a\u5e2f\u96fb\u8a71\u9593\u306e\u9001\u53d7\u4fe1\u4ee5\u5916\u3067\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u30022009\u5e743\u6708\u307e\u3067docomo\u3067\u767b\u9332\u53ef\u80fd\u3060\u3063\u305f\u305f\u3081\u3001\u4eca\u3082\u4f7f\u3044\u7d9a\u3051\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u304c\u3044\u307e\u3059\u3002\u306a\u305c\u5c4a\u304b\u306a\u3044\u304b\u5206\u304b\u3089\u306a\u3044\u3068\u304d\u306f\u3001\u3053\u306e\u30b1\u30fc\u30b9\u3092\u7591\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n  <!-- ======== 4. \u5bfe\u7b56 ======== -->\n  <h2 id=\"mh-solution\">\u5230\u9054\u7387\u3092\u4e0a\u3052\u308b5\u3064\u306e\u5bfe\u7b56\u30102026\u5e74\u7248\u3011<\/h2>\n\n  <h3>\u5bfe\u7b56\u2460 \u53d7\u4fe1\u8a31\u53ef\u30ea\u30b9\u30c8\uff08\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\uff09\u3078\u306e\u767b\u9332\u3092\u30e6\u30fc\u30b6\u30fc\u306b\u6848\u5185\u3059\u308b<\/h3>\n  <p>\u6700\u3082\u52b9\u679c\u7684\u306a\u5bfe\u7b56\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u81ea\u793e\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3084\u30c9\u30e1\u30a4\u30f3\u3092\u300c\u53d7\u4fe1\u8a31\u53ef\u30ea\u30b9\u30c8\u300d\u306b\u767b\u9332\u3057\u3066\u3082\u3089\u3046\u3053\u3068\u3067\u3059\u3002\u30e1\u30eb\u30de\u30ac\u767b\u9332\u76f4\u5f8c\u306e\u6848\u5185\u30e1\u30fc\u30eb\u3084LP\u306b\u8a2d\u5b9a\u65b9\u6cd5\u3092\u8a18\u8f09\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n  <table class=\"mh26-table\">\n    <thead>\n      <tr><th>\u30ad\u30e3\u30ea\u30a2<\/th><th>\u8a2d\u5b9a\u306e\u7279\u5fb4<\/th><\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td><strong>docomo<\/strong><\/td>\n        <td>\u300c\u53d7\u4fe1\u30ea\u30b9\u30c8\u8a2d\u5b9a\u300d\u304b\u3089\u30a2\u30c9\u30ec\u30b9\u307e\u305f\u306f\u30c9\u30e1\u30a4\u30f3\u3092\u767b\u9332\u3002\u767b\u9332\u3057\u305f\u30a2\u30c9\u30ec\u30b9\u306e\u5f8c\u534a\u90e8\u5206\u304c\u4e00\u81f4\u3059\u308b\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u53ef\u80fd\u306b\u3002<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>au<\/strong><\/td>\n        <td>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5b8c\u5168\u4e00\u81f4\u3001\u307e\u305f\u306f\u30c9\u30e1\u30a4\u30f3\uff08@\u4ee5\u964d\uff09\u306e\u4e00\u81f4\u3067\u53d7\u4fe1\u3092\u8a31\u53ef\u3002\u30c9\u30e1\u30a4\u30f3\u5358\u4f4d\u306e\u767b\u9332\u304c\u304a\u3059\u3059\u3081\u3002<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>softbank<\/strong><\/td>\n        <td>\u5b8c\u5168\u4e00\u81f4\u30fb\u30c9\u30e1\u30a4\u30f3\u4e00\u81f4\u306b\u52a0\u3048\u3001@\u30de\u30fc\u30af\u524d\u306e\u30ed\u30fc\u30ab\u30eb\u90e8\u5206\u3067\u306e\u4e00\u81f4\u8a2d\u5b9a\u3082\u53ef\u80fd\u3002\u300c\u53d7\u4fe1\u8a31\u53ef\u30ea\u30b9\u30c8\u8a2d\u5b9a\u300d\u304b\u3089\u767b\u9332\u3002<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n\n  <h3>\u5bfe\u7b56\u2461 \u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u306e\u5b9a\u671f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3067\u30ad\u30e3\u30ea\u30a2\u30d6\u30ed\u30c3\u30af\u3092\u56de\u907f\u3059\u308b<\/h3>\n  <p>\u914d\u4fe1\u30ea\u30b9\u30c8\u304b\u3089\u7121\u52b9\u306a\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u671f\u7684\u306b\u9664\u5916\u3059\u308b\u3053\u3068\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u624b\u52d5\u3067\u306e\u30c1\u30a7\u30c3\u30af\u306f\u5de5\u6570\u304c\u304b\u304b\u308a\u307e\u3059\u304c\u3001<strong>\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u306e\u300c\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u7ba1\u7406\u6a5f\u80fd\u300d<\/strong>\u3092\u6d3b\u7528\u3059\u308c\u3070\u3001\u30d0\u30a6\u30f3\u30b9\u3057\u305f\u30a2\u30c9\u30ec\u30b9\u3092\u81ea\u52d5\u7684\u306b\u62bd\u51fa\u30fb\u505c\u6b62\u3067\u304d\u307e\u3059\u3002\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\uff08\u6052\u4e45\u7684\u30a8\u30e9\u30fc\u30fb\u4e00\u6642\u7684\u30a8\u30e9\u30fc\uff09\u3054\u3068\u306b\u5bfe\u5fdc\u65b9\u91dd\u3092\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u30ea\u30b9\u30c8\u306e\u54c1\u8cea\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n  <h3>\u5bfe\u7b56\u2462 SPF\u30fbDKIM\u30fbDMARC\u3092\u8a2d\u5b9a\u3059\u308b <span class=\"mh26-badge\">2026\u5e74\u6700\u91cd\u8981<\/span><\/h3>\n  <p>\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e3\u3064\u3059\u3079\u3066\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u30012026\u5e74\u306b\u304a\u3044\u3066\u6700\u3082\u91cd\u8981\u306a\u5bfe\u7b56\u3067\u3059\u3002<\/p>\n\n  <ul class=\"mh26-check\">\n    <li><strong>SPF<\/strong>\uff1a\u81ea\u793e\u306e\u9001\u4fe1\u30b5\u30fc\u30d0\u30fcIP\u3092DNS\u306b\u767b\u9332\u3057\u3001\u306a\u308a\u3059\u307e\u3057\u3092\u9632\u3050<\/li>\n    <li><strong>DKIM<\/strong>\uff1a\u30e1\u30fc\u30eb\u306b\u96fb\u5b50\u7f72\u540d\u3092\u4ed8\u4e0e\u3057\u3001\u6539\u3056\u3093\u691c\u77e5\u3092\u53ef\u80fd\u306b\u3059\u308b<\/li>\n    <li><strong>DMARC<\/strong>\uff1aSPF\u30fbDKIM\u5931\u6557\u6642\u306e\u51e6\u7406\u65b9\u91dd\u3092\u8a2d\u5b9a\u3002\u307e\u305a\u306f <code>p=none<\/code> \u3067\u5c0e\u5165\u3057\u3001\u6bb5\u968e\u7684\u306b <code>quarantine<\/code>\u2192<code>reject<\/code> \u3078\u79fb\u884c\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081<\/li>\n  <\/ul>\n\n  <p class=\"mh26-note\">\u203b SPF\u3068DKIM\u3092\u4e21\u65b9\u8a2d\u5b9a\u3057\u3066\u304b\u3089DMARC\u3092\u8ffd\u52a0\u3059\u308b\u9806\u756a\u3092\u5fc5\u305a\u5b88\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u7247\u65b9\u3060\u3051\u306e\u72b6\u614b\u3067DMARC\u3092\u5148\u884c\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u9001\u4fe1\u5148\u306b\u3088\u3063\u3066\u306f\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n  <h3>\u5bfe\u7b56\u2463 \u914d\u4fe1\u901f\u5ea6\u306e\u6700\u9069\u5316\uff08\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\uff09<\/h3>\n  <p>\u30ad\u30e3\u30ea\u30a2\u3084\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u3088\u3063\u3066\u3001\u53d7\u3051\u5165\u308c\u3089\u308c\u308b\u9001\u4fe1\u901f\u5ea6\u306b\u306f\u5dee\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u5ea6\u306b\u5927\u91cf\u306e\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u3068\u30b5\u30fc\u30d0\u30fc\u306b\u8ca0\u8377\u304c\u304b\u304b\u308a\u3001\u9045\u5ef6\u3084\u30d6\u30ed\u30c3\u30af\u306e\u539f\u56e0\u306b\u306a\u308a\u307e\u3059\u3002<strong>\u30ad\u30e3\u30ea\u30a2\u3054\u3068\u306b\u6700\u9069\u306a\u914d\u4fe1\u30b9\u30d4\u30fc\u30c9\u306b\u81ea\u52d5\u8abf\u6574\u3059\u308b\u3053\u3068\u3067\u3001\u5230\u9054\u7387\u306e\u5927\u5e45\u306a\u6539\u5584<\/strong>\u304c\u898b\u8fbc\u3081\u307e\u3059\u3002<\/p>\n\n  <h3>\u5bfe\u7b56\u2464 RFC\u898f\u683c\u9055\u53cd\u30a2\u30c9\u30ec\u30b9\u3078\u306e\u4e8b\u524d\u5bfe\u5fdc<\/h3>\n  <p>\u767b\u9332\u30d5\u30a9\u30fc\u30e0\u306e\u6bb5\u968e\u3067RFC\u898f\u683c\u9055\u53cd\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6392\u9664\u3059\u308b\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u8a2d\u3051\u308b\u304b\u3001\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u5b9b\u3066\u306b\u914d\u4fe1\u3059\u308b\u969b\u306f\u30ea\u30b9\u30af\u3092\u30e6\u30fc\u30b6\u30fc\u306b\u4e8b\u524d\u306b\u4f1d\u3048\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3069\u3046\u3057\u3066\u3082\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3092\u5e0c\u671b\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u3001\u5c4a\u304b\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u660e\u8a18\u3057\u305f\u6ce8\u610f\u66f8\u304d\u3092\u6dfb\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n\n  <hr class=\"mh26-divider\">\n\n  <!-- ======== 5. \u3081\u308b\u914d\u304f\u3093\u306e\u53d6\u308a\u7d44\u307f ======== -->\n  <h2 id=\"mh-service\">\u3081\u308b\u914d\u304f\u3093\u304c\u884c\u3046\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u5230\u9054\u7387\u5411\u4e0a\u306e\u53d6\u308a\u7d44\u307f<\/h2>\n\n  <p>\u30e1\u30fc\u30eb\u914d\u4fe1SaaS\u306e\u300c\u3081\u308b\u914d\u304f\u3093\u300d\u3067\u306f\u3001\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3078\u306e\u5230\u9054\u7387\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u4ee5\u4e0b\u306e\u4ed5\u7d44\u307f\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n  <ul class=\"mh26-check\">\n    <li><strong>\u30ad\u30e3\u30ea\u30a2\u30fb\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3054\u3068\u306e\u6700\u9069\u306a\u914d\u4fe1\u30b9\u30d4\u30fc\u30c9\u81ea\u52d5\u8abf\u6574\uff08\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\uff09<\/strong>\uff1a\u5404\u30ad\u30e3\u30ea\u30a2\u306e\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u7279\u6027\u306b\u5408\u308f\u305b\u3066\u914d\u4fe1\u901f\u5ea6\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u3001\u30d6\u30ed\u30c3\u30af\u3084\u9045\u5ef6\u3092\u9632\u304e\u307e\u3059\u3002<\/li>\n    <li><strong>\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u81ea\u52d5\u7ba1\u7406\u6a5f\u80fd<\/strong>\uff1a\u30d0\u30a6\u30f3\u30b9\u3057\u305f\u30a2\u30c9\u30ec\u30b9\u3092\u81ea\u52d5\u3067\u914d\u4fe1\u505c\u6b62\u3057\u3001\u30ea\u30b9\u30c8\u306e\u54c1\u8cea\u3092\u7dad\u6301\u3002\u30a8\u30e9\u30fc\u7406\u7531\u3082\u30a2\u30c9\u30ec\u30b9\u3054\u3068\u306b\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/li>\n    <li><strong>SPF\u30fbDKIM\u5bfe\u5fdc\u306e\u9001\u4fe1\u74b0\u5883<\/strong>\uff1a\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306b\u5bfe\u5fdc\u3057\u305f\u5b89\u5168\u306a\u914d\u4fe1\u30a4\u30f3\u30d5\u30e9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n    <li><strong>\u5230\u9054\u7387\u30ec\u30dd\u30fc\u30c8<\/strong>\uff1a\u914d\u4fe1\u7d50\u679c\u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u78ba\u8a8d\u3067\u304d\u3001\u554f\u984c\u306e\u65e9\u671f\u767a\u898b\u3068\u6539\u5584\u304c\u53ef\u80fd\u3067\u3059\u3002<\/li>\n  <\/ul>\n\n  <div class=\"mh26-info\">\n    \ud83d\udca1 <strong>\u7121\u6599\u30d7\u30e9\u30f3\u3067\u304a\u8a66\u3057\u3044\u305f\u3060\u3051\u307e\u3059\uff01<\/strong><br>\n    \u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u7ba1\u7406\u6a5f\u80fd\u3084\u5230\u9054\u7387\u30ec\u30dd\u30fc\u30c8\u306a\u3069\u3001\u5b9f\u8df5\u7684\u306a\u6a5f\u80fd\u3092\u7121\u6599\u306e\u30d5\u30ea\u30fc\u30d7\u30e9\u30f3\u3067\u305d\u306e\u307e\u307e\u304a\u8a66\u3057\u3044\u305f\u3060\u3051\u307e\u3059\u3002\u307e\u305f\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u306b\u95a2\u3059\u308b\u304a\u60a9\u307f\u3092\u89e3\u6d88\u3067\u304d\u308b\u30aa\u30f3\u30e9\u30a4\u30f3\u30bb\u30df\u30ca\u30fc\u3082\u5b9a\u671f\u958b\u50ac\u4e2d\u3067\u3059\u3002\n  <\/div>\n\n  <!-- ======== 6. \u307e\u3068\u3081 ======== -->\n  <h2 id=\"mh-summary\">\u307e\u3068\u3081<\/h2>\n\n  <div class=\"mh26-summary\">\n    <p class=\"mh26-summary-title\">\ud83d\udccc 2026\u5e74\u7248 \u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u5230\u9054\u7387\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/p>\n    <ul class=\"mh26-check\">\n      <li>\u30e6\u30fc\u30b6\u30fc\u306b\u81ea\u793e\u30a2\u30c9\u30ec\u30b9\u30fb\u30c9\u30e1\u30a4\u30f3\u3092<strong>\u53d7\u4fe1\u8a31\u53ef\u30ea\u30b9\u30c8\u306b\u767b\u9332<\/strong>\u3057\u3066\u3082\u3089\u3046\u6848\u5185\u3092\u884c\u3063\u3066\u3044\u308b<\/li>\n      <li>\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u671f\u7684\u306b\u9664\u53bb\u3057\u3001<strong>\u914d\u4fe1\u30ea\u30b9\u30c8\u3092\u6e05\u6f54\u306b\u4fdd\u3063\u3066\u3044\u308b<\/strong><\/li>\n      <li><span class=\"mh26-badge\">\u6700\u91cd\u8981<\/span>  <strong>SPF\u30fbDKIM\u30fbDMARC\u306e3\u3064\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3092\u3059\u3079\u3066\u8a2d\u5b9a\u3057\u3066\u3044\u308b<\/strong><\/li>\n      <li>\u30ad\u30e3\u30ea\u30a2\u3054\u3068\u306b<strong>\u914d\u4fe1\u901f\u5ea6\u3092\u6700\u9069\u306b\u8abf\u6574<\/strong>\u3057\u3066\u30d6\u30ed\u30c3\u30af\u3092\u56de\u907f\u3057\u3066\u3044\u308b<\/li>\n      <li>RFC\u898f\u683c\u9055\u53cd\u30a2\u30c9\u30ec\u30b9\u3078\u306e<strong>\u5bfe\u5fdc\u7b56\u3092\u4e8b\u524d\u306b\u7528\u610f\u3057\u3066\u3044\u308b<\/strong><\/li>\n    <\/ul>\n  <\/div>\n\n  <p>\u300c\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u3044\u300d\u300c\u5230\u9054\u7387\u3092\u3082\u3063\u3068\u4e0a\u3052\u305f\u3044\u304c\u3069\u3053\u304b\u3089\u624b\u3092\u3064\u3051\u308c\u3070\u3044\u3044\u304b\u5206\u304b\u3089\u306a\u3044\u300d\u3068\u304a\u56f0\u308a\u306e\u65b9\u306f\u3001\u305c\u3072\u3081\u308b\u914d\u304f\u3093\u306e\u7121\u6599\u30d7\u30e9\u30f3\u3084\u30bb\u30df\u30ca\u30fc\u3092\u3054\u6d3b\u7528\u304f\u3060\u3055\u3044\u3002<\/p>\n\n  <!-- ======== CTA ======== -->\n  <div class=\"mh26-cta\">\n    <p>\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3078\u306e\u5230\u9054\u7387\u3067\u304a\u56f0\u308a\u306a\u3089<br>\u307e\u305a\u306f\u7121\u6599\u3067\u3081\u308b\u914d\u304f\u3093\u3092\u304a\u8a66\u3057\u304f\u3060\u3055\u3044<\/p>\n    <a class=\"mh26-btn\" href=\"https:\/\/www.meruhaikun.com\/f_request.html\" target=\"_blank\" rel=\"noopener\">\u7121\u6599\u30d7\u30e9\u30f3\u306b\u7533\u3057\u8fbc\u3080 \u2192<\/a>\n  <\/div>\n\n  <p class=\"mh26-meta\">\u516c\u958b\u65e5\uff1a2026\u5e745\u6708\uff5c\u3081\u308b\u914d\u304f\u3093\u7de8\u96c6\u90e8<\/p>\n\n<\/div><!-- \/.mh26-wrap -->\n","protected":false},"excerpt":{"rendered":"<p>\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306f\u3001\u914d\u4fe1\u8005\u5074\u304b\u3089\u898b\u308b\u3068\u30a2\u30c9\u30ec\u30b9\u304c\u5408\u3063\u3066\u3044\u3066\u3082\u9001\u4fe1\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u308a\u3001\u7279\u5b9a\u306e\u30a2\u30c9\u30ec\u30b9\u3060\u3051\u304c\u7a81\u7136\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u308a\u3001\u30e1\u30fc\u30eb\u306e\u5230\u9054\u304c\u6975\u7aef\u306b\u9045\u308c\u305f\u308a\u306a\u3069\u306e\u30c8\u30e9\u30d6\u30eb\u3082\u591a\u3044\u306e\u304c\u73fe\u72b6\u3067\u3059\u3002<br \/>\n\u305d\u3053\u3067\u672c\u8a18\u4e8b\u3067\u306f\u3001\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u306e\u6982\u8981\u3068\u914d\u4fe1\u30a8\u30e9\u30fc\u306b\u306a\u308b\u539f\u56e0\u3068\u5bfe\u7b56\u3092\u89e3\u8aac\u3057\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"author":6,"featured_media":761,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/746"}],"collection":[{"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=746"}],"version-history":[{"count":11,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/746\/revisions"}],"predecessor-version":[{"id":3137,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/746\/revisions\/3137"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=\/wp\/v2\/media\/761"}],"wp:attachment":[{"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=746"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=746"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meruhaikun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}