{"id":19017,"date":"2026-04-14T08:35:56","date_gmt":"2026-04-14T06:35:56","guid":{"rendered":"https:\/\/webhosting.de\/dkim-key-rotation-verwaltung-server-sicherheit-rotationsplan\/"},"modified":"2026-04-14T08:35:56","modified_gmt":"2026-04-14T06:35:56","slug":"dkim%e3%82%ad%e3%83%bc%e3%83%bb%e3%83%ad%e3%83%bc%e3%83%86%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e7%ae%a1%e7%90%86%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc%e3%83%bb%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/dkim-key-rotation-verwaltung-server-sicherheit-rotationsplan\/","title":{"rendered":"DKIM Key Rotation: \u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u306b\u3088\u308b\u6700\u5927\u9650\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3"},"content":{"rendered":"<p>\u4edd <strong>DKIM\u30ad\u30fc\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong> \u306f\u3001\u5b9a\u671f\u7684\u306b\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3057\u3001\u53e4\u3044\u30bb\u30ec\u30af\u30bf\u3092\u5b89\u5168\u306b\u6bb5\u968e\u7684\u306b\u524a\u9664\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u9375\u3092\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\u3001\u7f72\u540d\u4ed8\u304d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u507d\u9020\u304b\u3089\u5b88\u308a\u307e\u3059\u3002\u3053\u308c\u304c\u79c1\u306e\u5f37\u5316\u65b9\u6cd5\u3067\u3042\u308b\u3002 <strong>\u914d\u9054\u53ef\u80fd\u6027<\/strong> \u304a\u3088\u3073\u30c9\u30e1\u30a4\u30f3\u30fb\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3001\u8106\u5f31\u306a1024\u30d3\u30c3\u30c8\u9375\u3078\u306e\u653b\u6483\u3092\u9632\u304e\u30012048\u30d3\u30c3\u30c8\u9375\u306b\u3088\u308b\u5b89\u5168\u306a\u30e1\u30fc\u30eb\u8a8d\u8a3c\u3092\u5b9f\u73fe\u3059\u308b\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>2048\u30d3\u30c3\u30c8<\/strong> \u6a19\u6e96\u306e1024\u30d3\u30c3\u30c8\u30fb\u30ad\u30fc\u306b\u7f6e\u304d\u63db\u3048\u308b<\/li>\n  <li><strong>\u30bb\u30ec\u30af\u30bf<\/strong> \u4e26\u5217\u4f7f\u7528\uff08\u4f8b\uff1a\u30bb\u30ec\u30af\u30bf1\/\u30bb\u30ec\u30af\u30bf2\uff09<\/li>\n  <li><strong>\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/strong> 3\uff5e12\u30ab\u6708\u3001\u79fb\u884c\u671f\u3042\u308a<\/li>\n  <li><strong>\u30c6\u30b9\u30c8<\/strong> \u53e4\u3044\u30ad\u30fc\u306e\u30b9\u30a4\u30c3\u30c1\u3092\u5207\u308b\u524d\u306b<\/li>\n  <li><strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u30e2\u30cb\u30bf\u30fc\u3001\u30ec\u30dd\u30fc\u30c8\u5206\u6790<\/li>\n<\/ul>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/mailserver-sicherheit-8921.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>DKIM\u30ad\u30fc\u30fb\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u5b9f\u969b\u306b\u884c\u3046\u3053\u3068<\/h2>\n\n<p>\u79c1\u306f\u3001\u9001\u4fe1\u3059\u308b\u96fb\u5b50\u30e1\u30fc\u30eb\u306b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u7f72\u540d\u3092\u3057\u3066\u3044\u308b\u3002 <strong>\u30ad\u30fc<\/strong>, \u53d7\u4fe1\u8005\u306fDNS\u306eTXT\u30ec\u30b3\u30fc\u30c9\u306e\u516c\u958b\u9375\u3092\u4ecb\u3057\u3066\u7f72\u540d\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002selector1._domainkey.example.com\u306e\u3088\u3046\u306a\u30bb\u30ec\u30af\u30bf\u306f\u3001\u4e00\u81f4\u3059\u308b\u30a8\u30f3\u30c8\u30ea\u3068\u7f72\u540d\u3092\u78ba\u5b9f\u306b\u30ea\u30f3\u30af\u3055\u305b\u3001\u4e26\u5217\u51e6\u7406\u3092\u53ef\u80fd\u306b\u3059\u308b\u3002 <strong>\u9375<\/strong> \u3092\u30b9\u30e0\u30fc\u30ba\u306b\u5909\u66f4\u3067\u304d\u308b\u3002\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u884c\u308f\u306a\u3044\u3068\u3001\u9375\u306f\u53e4\u304f\u306a\u308a\u3001\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u306f\u77ed\u3044\u9375\u9577\u306b\u30da\u30ca\u30eb\u30c6\u30a3\u3092\u8ab2\u3057\u3001\u653b\u6483\u8005\u306f\u9577\u3044\u9375\u9577\u304b\u3089\u5229\u76ca\u3092\u5f97\u308b\u3053\u3068\u306b\u306a\u308b\u3002 <strong>\u79d8\u5bc6<\/strong>. .\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3055\u308c\u305f\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3001\u6709\u52b9\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u51fa\u56de\u3089\u306a\u304f\u306a\u308a\u3001\u3059\u3079\u3066\u306e\u30b7\u30b9\u30c6\u30e0\u306b\u65b0\u3057\u3044\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308b\u3068\u304d\u3060\u3051\u3001\u53e4\u3044\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u524a\u9664\u3057\u307e\u3059\u3002 <strong>\u30bb\u30ec\u30af\u30bf\u30fc<\/strong> \u3092\u4f7f\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u9632\u304e\u3001\u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u6697\u53f7\u3092\u6700\u65b0\u306b\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30ec\u30d9\u30eb<\/strong>.<\/p>\n\n<h2>\u5b9a\u671f\u7684\u306a\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u914d\u4fe1\u6027\u3092\u4fdd\u8a3c\u3059\u308b\u7406\u7531<\/h2>\n\n<p>\u77ed\u3044\u30ad\u30fc\u307e\u305f\u306f\u53e4\u3044\u30ad\u30fc\u306e\u8cbb\u7528 <strong>\u8a55\u5224<\/strong>, \u3053\u308c\u306f\u5373\u5ea7\u306b\u30b9\u30d1\u30e0\u7387\u306e\u4e0a\u6607\u306b\u53cd\u6620\u3055\u308c\u308b\u3002\u79c1\u306f\u65e5\u5e38\u7684\u306b2048\u30d3\u30c3\u30c8\u306b\u5207\u308a\u66ff\u3048\u3001Gmail\u3084Outlook\u306a\u3069\u306e\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u305d\u306e\u7f72\u540d\u3092 <strong>\u4fe1\u983c\u3067\u304d\u308b<\/strong> \u306b\u5206\u985e\u3059\u308b\u3002\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u884c\u3046\u305f\u3073\u306b\u3001\u653b\u6483\u5bfe\u8c61\u304c\u6e1b\u5c11\u3059\u308b\u3002 <strong>\u30c1\u30e3\u30f3\u30b9<\/strong> \u3092\u3088\u308a\u9577\u304f\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3057\u3066\u304a\u304f\u3002\u79c1\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u5931\u52b9\u3057\u3001\u5206\u6563\u30b7\u30b9\u30c6\u30e0\u304c\u65b0\u3057\u3044DNS\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u53d7\u4fe1\u3059\u308b\u306e\u306b\u5341\u5206\u306a\u79fb\u884c\u671f\u9593\u3092\u610f\u56f3\u7684\u306b\u9577\u304f\u3068\u3063\u3066\u3044\u308b\u3002 <strong>\u53c2\u7167<\/strong>. .\u8a8d\u8a3c\u306e\u5168\u4f53\u50cf\u306b\u3064\u3044\u3066\u306f\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u4ee5\u4e0b\u306e\u672c\u3092\u304a\u52e7\u3081\u3059\u308b\u3002 <a href=\"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-bimi%e3%80%81%e6%9c%80%e9%81%a9%e3%81%aa%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e3%83%bb%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%e3%83%bb%e3%83%9e%e3%83%88%e3%83%aa\/\">\u96fb\u5b50\u30e1\u30fc\u30eb\u30fb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30de\u30c8\u30ea\u30c3\u30af\u30b9<\/a>, SPF\u3001DMARC\u3001BIMI\u3092\u5099\u3048\u305fDKIM\u306f\u7406\u306b\u304b\u306a\u3063\u3066\u3044\u308b\u3002 <strong>\u30b3\u30cd\u30af\u30c8<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/mailserver_dkim_rotation_8453.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u63a8\u5968\u9593\u9694\u3068\u4e3b\u306a\u5f37\u307f<\/h2>\n\n<p>\u79c1\u306f\u30ea\u30b9\u30af\u306b\u5fdc\u3058\u30663\u30ab\u6708\u304b\u308912\u30ab\u6708\u3054\u3068\u306b\u4ea4\u4ee3\u3057\u3066\u3044\u308b\u3002 <strong>\u30f6\u6708<\/strong>, \u3088\u308a\u983b\u7e41\u306b\u3001\u3088\u308a\u9ad8\u3044\u8981\u4ef6\u3067\u30022048\u30d3\u30c3\u30c8\u306f\u79c1\u306e <strong>\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9<\/strong>, \u306a\u305c\u306a\u3089\u3001\u4e00\u822c\u7684\u306a\u30e1\u30fc\u30eb\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u77ed\u3044\u30ad\u30fc\u3092\u30de\u30a4\u30ca\u30b9\u306b\u8a55\u4fa1\u3057\u3001\u9577\u671f\u7684\u306b\u30d6\u30ed\u30c3\u30af\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002\u5207\u308a\u66ff\u3048\u308b\u524d\u306b\u3001\u79c1\u306f2\u3064\u76ee\u306e\u30bb\u30ec\u30af\u30bf\u3092\u8d77\u52d5\u3057\u3001\u7f72\u540d\u3092\u30c6\u30b9\u30c8\u3057\u3001\u53e4\u3044\u30ad\u30fc\u3092\u5c11\u306a\u304f\u3068\u308230\u65e5\u9593\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002 <strong>\u65e5\u6570<\/strong> \u304c\u4e26\u884c\u3057\u3066\u5b58\u5728\u3059\u308b\u3002\u79fb\u884c\u30d5\u30a7\u30fc\u30ba\u306e\u9593\u3001\u79c1\u306fDMARC\u306e\u30ec\u30dd\u30fc\u30c8\u7d50\u679c\u3092\u76e3\u8996\u3057\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u969c\u5bb3\u3092\u7279\u5b9a\u3059\u308b\u3002 <strong>\u30bd\u30fc\u30b9<\/strong> \u3092\u8a8d\u8b58\u3067\u304d\u308b\u3002\u7d99\u7d9a\u7684\u306b\u30b0\u30ea\u30fc\u30f3\u30fb\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3063\u305f\u5f8c\u306b\u306e\u307f\u3001\u53e4\u3044\u516c\u958b\u9375\u3092\u7121\u52b9\u3068\u3057\u3066\u30de\u30fc\u30af\u3057\u3001p=\u3092\u4f7f\u7528\u3057\u3066DNS\u5024\u3092\u30af\u30ea\u30a2\u3059\u308b\u3002<strong>\u306a\u3057<\/strong> \u307e\u305f\u306f\u524a\u9664\u3059\u308b\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30ea\u30b9\u30af\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb<\/th>\n      <th>\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb<\/th>\n      <th>\u4e3b\u306a\u5f37\u307f<\/th>\n      <th>\u79fb\u884c\u671f\u9593<\/th>\n      <th>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u4f4e\u3044<\/td>\n      <td>9-12\u30f6\u6708<\/td>\n      <td>2048\u30d3\u30c3\u30c8<\/td>\n      <td>30\u65e5<\/td>\n      <td>DMARC\u30ec\u30dd\u30fc\u30c8\u3001\u914d\u4fe1\u30ec\u30fc\u30c8<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td>\n      <td>6-9\u30f6\u6708<\/td>\n      <td>2048\u30d3\u30c3\u30c8<\/td>\n      <td>30\uff5e45\u65e5<\/td>\n      <td>\u30bb\u30ec\u30af\u30bf\u3054\u3068\u306e\u30a8\u30e9\u30fc\u7387<\/td>\n    <\/tr>\n    <tr>\n      <td>\u9ad8\u3044<\/td>\n      <td>3-6\u30f6\u6708<\/td>\n      <td>2048\u30d3\u30c3\u30c8<\/td>\n      <td>45\u65e5<\/td>\n      <td>\u304d\u3081\u7d30\u304b\u306a\u653f\u7b56\u8a55\u4fa1<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u6280\u8853\u7684\u306a\u6df1\u3055\uff1aDKIM\u30ec\u30b3\u30fc\u30c9\u3068\u7f72\u540d\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b<\/h2>\n\n<p>\u5805\u7262\u306a\u7f72\u540d\u306e\u305f\u3081\u306b\u3001\u79c1\u306fDNS\u30ec\u30b3\u30fc\u30c9\u3068\u30d8\u30c3\u30c0\u30fc\u306e\u7f72\u540d\u884c\u306e\u304d\u308c\u3044\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u6ce8\u610f\u3092\u6255\u3046\u3002DNS\u30ec\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5c11\u306a\u304f\u3068\u3082v=DKIM1; k=rsa; p=...\u3092\u8a2d\u5b9a\u3057\u3001\u4e0d\u8981\u306a\u8ffd\u52a0\u306f\u7701\u304f\u3002\u307e\u305f <strong>t=<\/strong>-\u30b9\u30a4\u30c3\u30c1\u3092\u7279\u5225\u306b\u4f7f\u3063\u3066\u3044\u308b\uff1a <strong>t=y<\/strong> \u30de\u30fc\u30af\u3055\u308c\u305f\u30c6\u30b9\u30c8\uff08\u4e00\u6642\u7684\u306b\u3057\u304b\u4f7f\u3048\u306a\u3044\uff09\u3001, <strong>t=s<\/strong> \u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u304c\u540c\u3058\u9375\u3092\u4f7f\u3063\u3066\u7f72\u540d\u3059\u308b\u3053\u3068\u304c\u306a\u3044\u5834\u5408\u306b\u306e\u307f\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u4ed5\u69d8 <strong>s=\u30e1\u30fc\u30eb<\/strong> \u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u3042\u308b\u3002\u7f72\u540d\u3067\u306f <strong>a=rsa-sha256<\/strong> \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u3057\u3066\u3001, <strong>c=\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u3066\u3044\u308b<\/strong> \u30ed\u30d0\u30b9\u30c8\u306a\u6b63\u6e96\u5316\u306e\u305f\u3081\u306b <strong>\u30aa\u30fc\u30d0\u30fc\u30b5\u30a4\u30f3<\/strong> (h=...) From\u3001To\u3001Subject\u3001Date\u3001Message-ID\u3001MIME-Version\u3001Content-Type\u306a\u3069\u306e\u91cd\u8981\u306a\u30d8\u30c3\u30c0\u30fc\u3002\u30bf\u30b0\u306b\u3064\u3044\u3066 <strong>l=<\/strong> (\u4f53\u9577\uff09\u3068 <strong>z=<\/strong> (\u30d8\u30c3\u30c0\u30fc\u30b3\u30d4\u30fc\uff09\u306f\u3001\u691c\u8a3c\u3092\u3088\u308a\u8106\u5f31\u306b\u3057\u305f\u308a\u3001\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u304b\u3089\u3060\u3002.<\/p>\n\n<p>d=\u30c9\u30e1\u30a4\u30f3\u306f\u3001DMARC\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u4e00\u81f4\u3059\u308b\u3088\u3046\u306b\u8a08\u753b\u3057\u307e\u3059\u3002\u8907\u6570\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u9001\u4fe1\u3059\u308b\u5834\u5408\u3001\u79c1\u306f\u610f\u56f3\u7684\u306b\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\uff08\u4f8b\uff1acrm.example.com\uff09\u3092\u9078\u629e\u3057\u3001\u30b7\u30b9\u30c6\u30e0\u3054\u3068\u306b\u72ec\u81ea\u306e\u30bb\u30ec\u30af\u30bf\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 <strong>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/strong>. .\u7591\u554f\u304c\u3042\u308b\u5834\u5408\u3001\u79c1\u306f\u7f72\u540d\u306ei= ID\u3092\u7a7a\u306b\u3057\u3066\u3001\u81ea\u52d5\u7684\u306bd=\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3059\u308b\u3088\u3046\u306b\u3057\u3001\u4e0d\u5fc5\u8981\u306bDMARC\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u4f11\u61a9<\/strong>.<\/p>\n\n<h2>DNS\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1aTTL\u3001\u30c1\u30e3\u30f3\u30ad\u30f3\u30b0\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u5236\u9650<\/h2>\n\n<p>2048\u30d3\u30c3\u30c8\u306e\u9375\u306f\u9577\u3044\u3002\u591a\u304f\u306eDNS\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f <strong>\u30c1\u30e3\u30f3\u30ad\u30f3\u30b0<\/strong> \u3092\u9006\u30ab\u30f3\u30de\u3067\u56f2\u3093\u3060\u8907\u6570\u306e\u90e8\u5206\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3001\u5b9f\u884c\u6642\u306b\u30a2\u30bb\u30f3\u30d6\u30eb\u3059\u308b\u3002\u4fdd\u5b58\u5f8c\u3001TXT\u30ec\u30b3\u30fc\u30c9\u306eBase64\u30d6\u30ed\u30c3\u30af\u306b\u6539\u884c\u3084\u30b9\u30da\u30fc\u30b9\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\u307e\u305f\u3001\u6587\u5b57\u5217\u3054\u3068\u306e255\u6587\u5b57\u30eb\u30fc\u30eb\u3068DNS\u5168\u4f53\u306e\u5236\u9650\u3082\u5b88\u3063\u3066\u3044\u308b\u3002\u8fc5\u901f\u306a\u5909\u63db\u306e\u305f\u3081\u306b <strong>TTL<\/strong> \u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u6570\u65e5\u524d\u306b\u8a2d\u5b9a\u3057\uff08\u4f8b\u3048\u3070300\uff5e600\u79d2\u306b\uff09\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u6210\u529f\u3057\u305f\u5f8c\u306b\u518d\u3073\u5897\u3084\u3059\u3002\u305d\u306e\u969b\u3001\u6b21\u306e\u3053\u3068\u3092\u8003\u616e\u3059\u308b\u3002 <strong>\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5<\/strong> (NXDOMAIN)\u3067\u3042\u308b\u305f\u3081\u3001\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u306b\u5bfe\u3059\u308b\u6642\u671f\u5c1a\u65e9\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u8a8d\u77e5\u3092\u9045\u3089\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<p>\u3059\u3079\u3066\u306e\u30ea\u30be\u30eb\u30d0\u304c\u540c\u3058\u30b9\u30d4\u30fc\u30c9\u3067\u66f4\u65b0\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u79c1\u306f\u30d0\u30c3\u30d5\u30a1\u3092\u8a08\u753b\u3059\u308b\u3002\u53e4\u3044\u30ec\u30b3\u30fc\u30c9\u306f\u5c11\u306a\u304f\u3068\u308230\u65e5\u9593\u3001\u30e1\u30fc\u30eb\u306e\u91cf\u304c\u975e\u5e38\u306b\u591a\u304b\u3063\u305f\u308aMTA\u306e\u901f\u5ea6\u304c\u9045\u304b\u3063\u305f\u308a\u3059\u308b\u5834\u5408\u306f\u3055\u3089\u306b\u9577\u304f\u4fdd\u5b58\u3057\u307e\u3059\u3002 <strong>45\u65e5<\/strong>. .\u305d\u306e\u3068\u304d\u521d\u3081\u3066\u3001\u305d\u308c\u3089\u3092\u524a\u9664\u3059\u308b\u304b\u3001\u516c\u958b\u9375\u30bf\u30b0\u3092\u8a2d\u5b9a\u3059\u308b\u3002 <strong>p=<\/strong> \u3092\u7a7a\u767d\u306b\u3057\u3066\u4f7f\u7528\u3092\u53d6\u308a\u6d88\u3059\u3002\u91cd\u8981 <strong>p=<\/strong> \u306f\u516c\u958b\u9375\u3092\u8a18\u8ff0\u3059\u308b\u3002<strong>p=<\/strong> \u306f\u30dd\u30ea\u30b7\u30fc\uff08\u306a\u3057\uff0f\u691c\u75ab\uff0f\u62d2\u5426\uff09\u3092\u5236\u5fa1\u3059\u308b\u3002\u79c1\u306f\u3053\u308c\u3092\u6587\u66f8\u5316\u3059\u308b <strong>\u7528\u8a9e\u89e3\u8aac<\/strong>, \u30c1\u30fc\u30e0\u304c\u30e9\u30f3\u30d6\u30c3\u30af\u306e\u4e2d\u3067\u7528\u8a9e\u3092\u9593\u9055\u3048\u306a\u3044\u3088\u3046\u306b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/dkim-key-rotation-mailserver-2764.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5b9f\u8df5\u30ac\u30a4\u30c9\u81ea\u5206\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067\u306e\u624b\u52d5\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/h2>\n\n<p>\u65b0\u3057\u3044\u30ad\u30fc\u30fb\u30da\u30a2\u304b\u3089\u59cb\u3081\u3001\u30af\u30ea\u30a2\u3068\u3057\u30662048\u30d3\u30c3\u30c8\u3092\u8a2d\u5b9a\u3059\u308b\u3002 <strong>\u30e9\u30a4\u30f3<\/strong>. .OpenDKIM\u3067\u306f\u3001opendkim-genkey\u3067\u5404\u30bb\u30ec\u30af\u30bf\u306e\u30da\u30a2\u3092\u751f\u6210\u3057\u3001DNS\u3067\u516c\u958b\u9375\u3092\u516c\u958b\u3057\u3001\u305d\u3057\u3066 <strong>\u4f1d\u64ad<\/strong> \u30aa\u30d5\u3002\u305d\u306e\u5f8c\u3001MTA\u306eMilter\u8a2d\u5b9a\u3092\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u306b\u5909\u66f4\u3057\u3001\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u306e\u30d8\u30c3\u30c0\u7f72\u540d\u3092\u6ce8\u610f\u6df1\u304f\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>\u307e\u3055\u306b<\/strong>. .\u3082\u3057\u3059\u3079\u3066\u304c\u3046\u307e\u304f\u3044\u304f\u306a\u3089\u3001\u53e4\u3044\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u304c\u9001\u3089\u308c\u306a\u3044\u3088\u3046\u306b\u3001\u4e88\u5b9a\u3055\u308c\u3066\u3044\u308b\u79fb\u884c\u671f\u9593\u4e2d\u306f\u4e21\u65b9\u306e\u30bb\u30ec\u30af\u30bf\u3092\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3057\u3066\u304a\u304f\u3002 <strong>\u5931\u6557<\/strong>. .Plesk\u3092\u304a\u4f7f\u3044\u306e\u65b9\u306f\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u672c\u66f8\u3067\u5b9f\u7528\u7684\u306a\u30d2\u30f3\u30c8\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-plesk-%e3%82%ac%e3%82%a4%e3%83%89-%e5%ae%89%e5%85%a8-%e3%83%81%e3%83%a5%e3%83%bc%e3%83%8b%e3%83%b3%e3%82%b0-%e3%83%97%e3%83%ad%e3%83%95%e3%82%a7%e3%83%83%e3%82%b7%e3%83%a7%e3%83%8a\/\">\u30d7\u30ec\u30b9\u30af\u30ac\u30a4\u30c9<\/a>, DKIM\u306e\u53d6\u308a\u6271\u3044\u3068\u5fae\u8abf\u6574\u304c\u624b\u306e\u5c4a\u304f\u7bc4\u56f2\u306b <strong>\u4f5c\u308b<\/strong>.<\/p>\n\n<p>\u79c1\u306f\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u3001\u65e5\u4ed8\u3001\u30bb\u30ec\u30af\u30bf\u3001\u30ad\u30fc\u30b5\u30a4\u30ba\u3001DNS\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u542b\u3080\u30b7\u30f3\u30d7\u30eb\u306a\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ed\u30b0\u306b\u8a18\u9332\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30eb\u30fc\u30c6\u30a3\u30f3<\/strong>. .\u3053\u306e\u65e5\u8a8c\u306f\u3001\u76e3\u67fb\u3001\u6df7\u4e71\u3001\u30c1\u30fc\u30e0\u306e\u5f15\u304d\u7d99\u304e\u306a\u3069\u306e\u969b\u306b\u3001\u9577\u3044\u6642\u9593\u3092\u304b\u3051\u305a\u306b\u5f79\u306b\u7acb\u3061\u307e\u3059\u3002 <strong>\u691c\u7d22<\/strong>. .\u3088\u308a\u4fbf\u5229\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u306f\u691c\u8a3c\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u524d\u306b\u3001\u30ad\u30fc\u3092\u751f\u6210\u3057\u3001DNS\u30ec\u30b3\u30fc\u30c9\u3092\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3057\u3001MTA\u306e\u8a2d\u5b9a\u3092\u8abf\u6574\u3059\u308b\u5c0f\u3055\u306a\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u66f8\u3044\u3066\u3044\u307e\u3059\u3002 <strong>\u6d3e\u9063<\/strong>. .\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30bb\u30b9\u3092\u6a19\u6e96\u5316\u3057\u3001\u751f\u7523\u7684\u306a\u74b0\u5883\u306b\u304a\u3044\u3066\u9ad8\u4fa1\u306a\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u306e\u539f\u56e0\u3068\u306a\u308b\u30bf\u30a4\u30d7\u30df\u30b9\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u539f\u56e0<\/strong>. .\u79fb\u884c\u671f\u9593\u306e\u7d42\u308f\u308a\u306b\u3001\u79c1\u306fDNS\u306e\u53e4\u3044\u30ad\u30fc\u3092\u5931\u52b9\u3055\u305b\u3001\u6700\u5f8c\u306b\u3082\u3046\u4e00\u5ea6DMARC\u30ec\u30dd\u30fc\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>\u30a2\u30ce\u30de\u30ea\u30fc<\/strong>.<\/p>\n\n<h2>\u5b89\u5168\u306a\u9375\u7ba1\u7406\u3068\u904b\u7528\u54c1\u8cea<\/h2>\n\n<p>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8DKIM\u30ad\u30fc\u3082\u4ed6\u306e\u30ad\u30fc\u3068\u540c\u69d8\u306b\u6271\u3046 <strong>\u79d8\u5bc6<\/strong>\u30d5\u30a1\u30a4\u30eb\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u306e\u5236\u9650\uff08Milter\u30e6\u30fc\u30b6\u30fc\u306e\u307f\u8aad\u307f\u53d6\u308a\u53ef\u80fd\u306a\u3069\uff09\u3001\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u7981\u6b62\u3001\u30a2\u30af\u30bb\u30b9\u3068\u5171\u6709\u306e\u305f\u3081\u306e\u660e\u78ba\u306a\u5f79\u5272\u5206\u62c5\u3002\u5927\u898f\u6a21\u306a\u74b0\u5883\u3067\u306f\u3001\u79c1\u306f\u9375\u3092 <strong>\u30a8\u30a4\u30c1\u30a8\u30b9\u30a8\u30e0<\/strong>- \u307e\u305f\u306f\u79d8\u5bc6\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3092\u4f7f\u7528\u3057\u3001\u5b9a\u7fa9\u3055\u308c\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u7d4c\u7531\u3067\u306e\u307fMTA\u306e\u7f72\u540d\u3092\u8a31\u53ef\u3059\u308b\u3002CI\/CD\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u306f\u3001\u9375\u306f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u3068\u306f\u5225\u306b\u4fdd\u7ba1\u3057\u3001\u6210\u679c\u7269\u3084\u30ed\u30b0\u306b\u4fdd\u5b58\u3055\u308c\u308b\u3053\u3068\u306f\u907f\u3051\u308b\u3002 <strong>\u30e9\u30f3\u30c9<\/strong>. .\u30ea\u30de\u30a4\u30f3\u30c0\u30fc\u306e\u3042\u308b\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30fb\u30ab\u30ec\u30f3\u30c0\u30fc\uff08\u7de0\u3081\u5207\u308a\u306e60\u65e5\u524d\u300130\u65e5\u524d\u30017\u65e5\u524d\u306a\u3069\uff09\u306f\u3001\u66f4\u65b0\u304c\u65e5\u5e38\u696d\u52d9\u306e\u4e00\u90e8\u306b\u306a\u308b\u306e\u3092\u9632\u3050\u3002 <strong>\u6ec5\u3073\u308b<\/strong>.<\/p>\n\n<p>\u79c1\u306f\u610f\u8b58\u7684\u306b\u4ee5\u4e0b\u3092\u9078\u629e\u3057\u307e\u3059\u3002 <strong>rsa-sha256<\/strong>; ed25519-ha256\u306e\u3088\u3046\u306a\u4ee3\u66ff\u624b\u6bb5\u306f\u52b9\u7387\u7684\u3060\u304c\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u307e\u3060\u5e83\u304f\u78ba\u7acb\u3055\u308c\u3066\u3044\u306a\u3044\u30023072\u30d3\u30c3\u30c8\u306eRSA\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u9ad8\u3081\u307e\u3059\u304c\u3001\u4e00\u90e8\u306eDNS\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3067\u306f\u9650\u754c\u306b\u9054\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u30022048\u30d3\u30c3\u30c8\u306f\u5805\u7262\u3067\u3059\u3002 <strong>\u30b9\u30a4\u30fc\u30c8\u30b9\u30dd\u30c3\u30c8<\/strong> \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u4e92\u63db\u6027\u306e\u9762\u3067\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/Mailserver_Management_Sicherheit_7834.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>Microsoft 365\u3068Google Workspace\u306b\u3088\u308b\u81ea\u52d5\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/h2>\n\n<p>Microsoft 365\u3067\u306fPowerShell\u3092\u4f7f\u7528\u3057\u3001Rotate-DkimSigningConfig\u3092\u4f7f\u7528\u3057\u3066\u6b21\u306e\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002 <strong>\u30b9\u30a4\u30c3\u30c1<\/strong> \u3092\u65b0\u3057\u3044\u9375\u306b\u5909\u66f4\u3059\u308b\u3002\u4e00\u65b9\u3001\u30b9\u30e0\u30fc\u30ba\u306a\u5207\u308a\u66ff\u3048\u306e\u305f\u3081\u306b2\u3064\u306e\u30bb\u30ec\u30af\u30bf\u304c\u5229\u7528\u53ef\u80fd\u3067\u3042\u308b\u3002\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8\u306f\u3001\u7f72\u540d\u3055\u308c\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8f38\u9001\u4e2d\u306b\u5931\u308f\u308c\u306a\u3044\u3088\u3046\u3001\u6570\u65e5\u9593\u306b\u308f\u305f\u308b\u5207\u308a\u66ff\u3048\u30d5\u30a7\u30fc\u30ba\u3092\u793e\u5185\u3067\u8a08\u753b\u3057\u3066\u3044\u308b\u3002 <strong>\u671f\u9650\u5207\u308c<\/strong>. .\u3053\u306e\u9593\u3001DMARC\u30ec\u30fc\u30c8\u3068\u30d8\u30c3\u30c0\u30fc\u3092\u3001\u4e21\u65b9\u306e\u30bb\u30ec\u30af\u30bf\u304c\u304d\u308c\u3044\u306b\u306a\u308b\u307e\u3067\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>\u30c1\u30a7\u30c3\u30af<\/strong>. .Google Workspace\u3067\u306f\u3001\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u624b\u52d5\u3067\u751f\u6210\u3057\u3001\u516c\u958b\u9375\u3092\u5165\u529b\u3057\u3066\u3001\u30b7\u30b9\u30c6\u30e0\u3092\u65b0\u3057\u3044\u3082\u306e\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002 <strong>\u7f72\u540d<\/strong>. .\u540c\u3058\u3053\u3068\u304c\u3053\u3053\u3067\u3082\u5f53\u3066\u306f\u307e\u308b\uff1a\u5341\u5206\u306a\u6642\u9593\u4e26\u884c\u3057\u3066\u30c9\u30e9\u30a4\u30d6\u3057\u3001\u30ed\u30b0\u3092\u8aad\u307f\u3001\u305d\u3057\u3066\u53e4\u3044\u30ad\u30fc\u3060\u3051\u3092\u8aad\u3080\u3002 <strong>\u30b9\u30a4\u30c3\u30c1\u3092\u5207\u308b<\/strong>.<\/p>\n\n<p>\u5916\u90e8\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u306e\u6642\u9593\u304c\u7570\u306a\u308b\u305f\u3081\u3001\u30bf\u30a4\u30df\u30f3\u30b0\u3068\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u304c\u3088\u308a\u91cd\u8981\u306b\u306a\u308b\u3053\u3068\u3092\u5ff5\u982d\u306b\u7f6e\u3044\u3066\u3044\u308b\u3002 <strong>\u4f5c\u308b<\/strong>. .\u8907\u6570\u306e\u653e\u9001\u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u30b5\u30fc\u30d3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u8a08\u753b\u3092\u56fa\u5b9a\u3055\u308c\u305f\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u7d71\u5408\u3057\u307e\u3059\u3002 <strong>\u30a6\u30a3\u30f3\u30c9\u30a6\u30ba<\/strong>. .\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30b3\u30fc\u30c0\u30fc\u3084\u30ec\u30b7\u30fc\u30d0\u30fc\u3092\u6df7\u4e71\u3055\u305b\u3001\u914d\u4fe1\u7387\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3088\u3046\u306a\u77db\u76fe\u3057\u305f\u5909\u66f4\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u4e0b\u3052\u308b<\/strong>. .\u7591\u554f\u304c\u3042\u308b\u3068\u304d\u306f\u3001\u4ea4\u4ee3\u3092\u3042\u307e\u308a\u306a\u3044\u6642\u671f\u306b\u5ef6\u671f\u3059\u308b\u3002 <strong>\u30c8\u30e9\u30d5\u30a3\u30c3\u30af<\/strong>. .\u3053\u308c\u306b\u306f\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306e\u7a93\u53e3\u3092\u660e\u78ba\u306b\u4f1d\u3048\u308b\u3053\u3068\u3084\u3001\u3055\u307e\u3056\u307e\u306a\u30bf\u30fc\u30b2\u30c3\u30c8\u30fb\u30d7\u30ed\u30d0\u30a4\u30c0\u3092\u4ecb\u3057\u305f\u30c6\u30b9\u30c8\u30a2\u30ab\u30a6\u30f3\u30c8\u306e\u7de8\u6210\u3082\u542b\u307e\u308c\u308b\u3002 <strong>\u4f7f\u3046<\/strong>.<\/p>\n\n<h2>M365\/\u30ef\u30fc\u30af\u30b9\u30da\u30fc\u30b9\uff1a\u7279\u5225\u306a\u6a5f\u80fd\u3068\u843d\u3068\u3057\u7a74<\/h2>\n\n<p>Microsoft 365\u306f\u56fa\u5b9a\u30bb\u30ec\u30af\u30bf\u540d\uff08selector1\/selector2\uff09\u3068\u5185\u90e8\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30ed\u30fc\u30eb\u30b9<\/strong>, DNS\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u6b63\u3057\u304f\u306a\u308a\u6b21\u7b2c\u3001\u7f72\u540d\u304c\u958b\u59cb\u3055\u308c\u308b\u3002\u30ea\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u306f\u3001\u305d\u306e\u9593\u306b\u53e4\u3044\u9375\u3084\u65b0\u3057\u3044\u9375\u3067\u96fb\u5b50\u30e1\u30fc\u30eb\u3092\u7f72\u540d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u4e26\u884c\u30d5\u30a7\u30fc\u30ba\u304c\u8a08\u753b\u3055\u308c\u3066\u3044\u308b\u3002Google Workspace\u3067\u306f\u3001TXT\u30ad\u30fc\u304c2048\u30d3\u30c3\u30c8\u30ad\u30fc\u3067\u6b63\u3057\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u30c1\u30e3\u30f3\u30ad\u30f3\u30b0<\/strong> TTL\u3092\u610f\u56f3\u7684\u306b\u4f4e\u304f\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u9ad8\u901f\u306a\u8996\u8a8d\u6027\u3092\u5b9f\u73fe\u3057\u3066\u3044\u308b\u3002\u79c1\u306f\u30bf\u30a4\u30df\u30f3\u30b0\u30a8\u30e9\u30fc\u3084\u90e8\u5206\u7684\u306a\u30c7\u30d7\u30ed\u30a4\u3092\u691c\u51fa\u3059\u308b\u305f\u3081\u306b\u3001\u7a4d\u6975\u7684\u306b\u3053\u308c\u3092\u8aad\u3093\u3067\u3044\u308b\u3002 <strong>\u8a8d\u8b58\u3059\u308b<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/dkim_key_rotation_6734.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u4ee3\u8868\u56e3\u3068\u8907\u6570\u306eESP\u3092\u6b63\u3057\u304f\u8abf\u6574\u3059\u308b<\/h2>\n\n<p>\u30b5\u30fc\u30d3\u30b9\u30fb\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u4ed5\u4e8b\u3092\u3059\u308b\u5834\u5408\u3001\u79c1\u306f\u6b21\u306e\u3088\u3046\u306a\u65b9\u6cd5\u3067\u59d4\u4efb\u3059\u308b\u3053\u3068\u306b\u3057\u3066\u3044\u308b\u3002 <strong>CNAME<\/strong>-\u30a8\u30f3\u30c8\u30ea\u30fc\u3092_domainkey\u30db\u30b9\u30c8\u306b\u6e21\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u9375\u306e\u7ba1\u7406\u3092\u81ea\u5206\u305f\u3061\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u7261\u725b<\/strong>. .\u5404\u30bd\u30fc\u30b9\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u30bb\u30ec\u30af\u30bf\u3092\u6587\u66f8\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30f3\u30d5\u30ea\u30af\u30c8\u3092\u56de\u907f\u3057\u3001\u9593\u9055\u3063\u3066\u5165\u529b\u3059\u308b\u3053\u3068\u304c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c8<\/strong>. .\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30c4\u30fc\u30eb\u3001CRM\u3001\u72ec\u81ea\u306e\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3092\u4f7f\u3063\u305f\u4e26\u884c\u914d\u4fe1\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u610f\u8b58\u7684\u306b\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u9806\u756a\u3092\u8a08\u753b\u3057\u3066\u3044\u308b\u3002 <strong>\u3092\u901a\u3057\u3066<\/strong>. .\u5404\u30b7\u30b9\u30c6\u30e0\u306b\u3064\u3044\u3066\u30012048\u30d3\u30c3\u30c8\u306e\u9375\u304c\u304d\u308c\u3044\u306b\u53d7\u3051\u5165\u308c\u3089\u308c\u3001\u30d8\u30c3\u30c0\u30fc\u304c\u4e00\u8cab\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u4e8b\u524d\u306b\u30c6\u30b9\u30c8\u3059\u308b\u3002 <strong>\u73fe\u308c\u308b<\/strong>.<\/p>\n\n<p>\u30d5\u30a7\u30a4\u30eb\u30bb\u30fc\u30d5\u306e\u305f\u3081\u306b\u3001\u3042\u3089\u304b\u3058\u30813\u3064\u306e\u30bb\u30ec\u30af\u30bf\u3092\u5b9a\u7fa9\u3057\u3066\u304a\u304f\u3002 <strong>\u30d0\u30c3\u30d5\u30a1<\/strong>. .3\u3064\u76ee\u306f\u3001\u6f0f\u6d29\u3057\u305f\u30ad\u30fc\u3092\u3059\u3050\u306b\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u5099\u3048\u3066\u4e88\u5099\u3068\u3057\u3066\u6b8b\u3057\u3066\u304a\u304f\u3002 <strong>\u7f6e\u304d\u63db\u3048\u308b<\/strong> \u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u306e\u30ea\u30b6\u30fc\u30d6\u306f\u3001\u79c1\u304c\u6025\u306a\u884c\u52d5\u3092\u53d6\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u3001\u914d\u9054\u53ef\u80fd\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3082\u306e\u3067\u3042\u308b\u3002 <strong>\u30de\u30b9\u30c8<\/strong>. .\u52a0\u3048\u3066\u3001\u9375\u306e\u7ba1\u7406\u3082\u5185\u90e8\u3067\u884c\u3063\u3066\u3044\u308b\u3002 <strong>\u30e9\u30f3\u30d6\u30c3\u30af<\/strong> \u5f79\u5272\u5206\u62c5\u3092\u660e\u78ba\u306b\u3059\u308b\u3002\u3064\u307e\u308a\u3001\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u4e2d\u306b\u8ab0\u304cDNS\u3001MTA\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u30a2\u30af\u30bb\u30b9\u3092\u64cd\u4f5c\u3057\u3001\u8ab0\u304c\u30a2\u30af\u30bb\u30d7\u30bf\u30f3\u30b9\u306b\u8cac\u4efb\u3092\u6301\u3064\u304b\u3092\u5168\u54e1\u304c\u628a\u63e1\u3057\u3066\u3044\u308b\u306e\u3060\u3002 <strong>\u7279\u5fb4<\/strong>.<\/p>\n\n<h2>\u30de\u30eb\u30c1\u30c9\u30e1\u30a4\u30f3\u6226\u7565\u306e\u30af\u30ea\u30fc\u30f3\u30d7\u30e9\u30f3\u30cb\u30f3\u30b0\u3068\u30a2\u30e9\u30a4\u30f3\u30e1\u30f3\u30c8<\/h2>\n\n<p>\u751f\u7523\u30c1\u30e3\u30cd\u30eb\u3001\u53d6\u5f15\u30c1\u30e3\u30cd\u30eb\u3001\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u30c1\u30e3\u30cd\u30eb\u3092\u8ad6\u7406\u7684\u306b\u5206\u96e2\u3057\u3066\u3044\u307e\u3059\u3002\u5225\u3005\u306e\u30bb\u30ec\u30af\u30bf\u3092\u6301\u3064\u5225\u3005\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\uff08\u4f8b\uff1abilling.example.com\u3001notify.example.com\u3001news.example.com\uff09\u304c\u3001\u30af\u30ea\u30fc\u30f3\u3067\u900f\u660e\u6027\u306e\u9ad8\u3044\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u30c1\u30e3\u30cd\u30eb\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002 <strong>DMARC\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/strong> \u307e\u305f\u3001\u8a2d\u5b9a\u30df\u30b9\u306b\u3088\u308b\u526f\u4f5c\u7528\u3092\u8efd\u6e1b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001CRM\u6d3e\u9063\u304c\u610f\u56f3\u305b\u305a\u306b\u30e1\u30a4\u30f3\u30fb\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u5224\u3092\u843d\u3068\u3059\u3053\u3068\u306f\u306a\u3044\u3002 <strong>\u8ca0\u62c5<\/strong>. .\u79c1\u306f\u5404\u30c1\u30e3\u30f3\u30cd\u30eb\u306e\u30aa\u30fc\u30ca\u30fc\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u65e5\u3001\u30c6\u30b9\u30c8\u30d1\u30b9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u3002\u8907\u6570\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u540c\u3058\u30bb\u30ec\u30af\u30bf\u30fc\u3092\u5171\u6709\u3059\u308b\u306e\u3092\u907f\u3051\u3001\u30cd\u30fc\u30df\u30f3\u30b0\u3082\u540c\u3058\u306b\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u3044\u3063\u3066\u3044<\/strong> (\u4f8b\uff1as2026q1\u3001s2026q3\uff09\u306e\u3088\u3046\u306b\u3001\u30ed\u30b0\u3084DMARC\u30ec\u30dd\u30fc\u30c8\u304c\u3059\u3050\u306b\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/dkim-key-rotation-9056.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5207\u308a\u66ff\u3048\u5f8c\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3068\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/h2>\n\n<p>\u3055\u307e\u3056\u307e\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u4f55\u901a\u304b\u306e\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u9001\u308a\u3001\u8a8d\u8a3c\u7d50\u679c\u3092\u8aad\u307f\u3001DKIM\u7f72\u540d\u3092\u7d30\u90e8\u306b\u81f3\u308b\u307e\u3067\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u3067\u3001\u3059\u3079\u3066\u306e\u5207\u308a\u66ff\u3048\u3092\u691c\u8a3c\u3057\u3066\u3044\u308b\u3002 <strong>\u8a73\u7d30<\/strong>. .DMARC\u306e\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u3067\u306f\u3001\u5404\u30ec\u30dd\u30fc\u30c8\u306e\u6bce\u65e5\u306e\u5408\u5426\u6bd4\u7387\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u30bd\u30fc\u30b9<\/strong>. .\u79c1\u306f\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3084DNS\u306e\u554f\u984c\u3092\u7279\u5b9a\u3059\u308b\u305f\u3081\u306b\u3001\u76ee\u7acb\u3064\u53d7\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3092\u30de\u30fc\u30af\u3057\u3066\u3044\u308b\u3002 <strong>\u63a2\u3059<\/strong>. .\u307e\u305f\u3001MTA\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u8a18\u9332\u3057\u3001\u914d\u4fe1\u7d71\u8a08\u3068\u95a2\u9023\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001\u539f\u56e0\u3068\u7d50\u679c\u3092\u7d20\u65e9\u304f\u5206\u6790\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u8a8d\u8b58\u3059\u308b<\/strong>. .SPF\u3001DKIM\u3001DMARC\u306e\u57fa\u672c\u304c\u307e\u3060\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u3053\u306e\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u6982\u8981\u3067\u59cb\u3081\u3089\u308c\u307e\u3059\uff1a <a href=\"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bcauth%e3%82%b5\/\">SPF\u3001DKIM\u3001DMARC<\/a> \u5f79\u5272\u3092\u660e\u78ba\u306b\u8aac\u660e\u3057 <strong>\u30b3\u30f3\u30af\u30ea\u30fc\u30c8<\/strong>.<\/p>\n\n<p>\u3082\u3057\u500b\u3005\u306e\u6545\u969c\u304c\u7d9a\u304f\u3088\u3046\u3067\u3042\u308c\u3070\u3001\u30bb\u30ec\u30af\u30bf\u3001d=\u30c9\u30e1\u30a4\u30f3\u3001b=\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u30d8\u30c3\u30c0\u3092\u3088\u304f\u5206\u6790\u3059\u308b\u3002 <strong>\u5fb9\u5e95\u7684<\/strong>. .\u591a\u304f\u306e\u5834\u5408\u3001DNS\u30ec\u30b3\u30fc\u30c9\u306e\u30bf\u30a4\u30d7\u30df\u30b9\u3001\u516c\u958b\u9375\u306e\u6539\u884c\u30df\u30b9\u3001\u307e\u305f\u306f\u8a2d\u5b9a\u30df\u30b9\u304c\u3042\u308b\u3002 <strong>\u30db\u30b9\u30c8\u540d<\/strong>. .\u30d8\u30c3\u30c0\u30fc\u66f8\u304d\u63db\u3048\u306e\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u3001\u7f72\u540d\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u6b63\u898f\u5316\u65b9\u6cd5\u3068\u30ec\u30b7\u30fc\u30d0\u30fc\u30b7\u30b9\u30c6\u30e0\u3092\u6bd4\u8f03\u3059\u308b\u3002 <strong>\u3055\u3089\u3051\u51fa\u3059<\/strong>. .\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u3088\u3063\u3066\u6319\u52d5\u304c\u7570\u306a\u308b\u306e\u3067\u3001\u8907\u6570\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u5bfe\u3057\u3066\u518d\u5ea6\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002 <strong>\u9055\u3046<\/strong>. .\u3059\u3079\u3066\u306e\u30d1\u30b9\u304c\u5b89\u5b9a\u3057\u3066\u521d\u3081\u3066\u3001\u6700\u7d42\u7684\u306b\u53e4\u3044\u30ad\u30fc\u3092 <strong>DNS<\/strong>.<\/p>\n\n<h2>\u54c1\u8cea\u6307\u6a19\u3068\u76ee\u6a19\u5024<\/h2>\n\n<p>\u79c1\u306f\u3001\u914d\u4fe1\u53ef\u80fd\u6027\u306b\u95a2\u3059\u308b\u5185\u90e8SLO\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\uff1a\u30bd\u30fc\u30b9\u3054\u3068\u306eDKIM\u30d1\u30b9\u7387\u3001\u30c1\u30e3\u30cd\u30eb\u3054\u3068\u306eDMARC\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3001\u5927\u898f\u6a21\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u300c\u53d7\u4fe1\u7bb1\u300d\u914d\u4fe1\u306e\u5272\u5408\u3001\u30bb\u30ec\u30af\u30bf\u3054\u3068\u306e\u5909\u63db\u5b8c\u4e86\u307e\u3067\u306e\u6642\u9593\u3002\u4e26\u884c\u6bb5\u968e\u3067\u306f\u3001\u77ed\u671f\u7684\u306b\u306f\u6df7\u5728\u7387\u304c\u4e88\u60f3\u3055\u308c\u308b\u304c\u3001\u4e2d\u671f\u7684\u306b\u306f <strong>\u53a9\u820e<\/strong> DKIM\u306e\u30d1\u30b9\u30ec\u30fc\u30c8\u306f%\u3067100\u306b\u8fd1\u3044\u3002\u30af\u30a9\u30fc\u30bf\u304c\u5b9a\u7fa9\u3055\u308c\u305f\u3057\u304d\u3044\u5024\u3092\u4e0b\u56de\u3063\u305f\u5834\u5408\u3001\u79c1\u306f\u30d7\u30ec\u30a4\u30d6\u30c3\u30af\uff08\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3001TTL\u30c1\u30a7\u30c3\u30af\u3001DNS\u691c\u8a3c\u3001MTA\u8a2d\u5b9a\u3001\u518d\u30c6\u30b9\u30c8\uff09\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u6c17\u4ed8\u304b\u306a\u3044\u3046\u3061\u306b <strong>\u54c1\u8cea<\/strong> \u62bc\u3059\u3002.<\/p>\n\n<h2>\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u76f4\u63a5\u7684\u306a\u89e3\u6c7a\u7b56<\/h2>\n\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u306f24\u301c48\u6642\u9593\u6301\u7d9a\u3059\u308b\u305f\u3081\u3001\u77ed\u3059\u304e\u308b\u79fb\u884c\u6642\u9593\u306f\u30b7\u30b0\u30cd\u30c1\u30e3\u3092\u58ca\u3057\u3066\u3057\u307e\u3046\u3002 <strong>\u30db\u30fc\u30eb\u30c9<\/strong>. .\u305d\u306e\u305f\u3081\u3001\u30d1\u30e9\u30ec\u30eb\u30d5\u30a7\u30fc\u30ba\u3067\u306f\u4f59\u88d5\u3092\u6301\u3063\u305f\u8a08\u753b\u3092\u7acb\u3066\u3001\u5b9f\u6226\u3092\u5fd7\u5411\u3059\u308b\u3002 <strong>\u30e9\u30f3\u30bf\u30a4\u30e0<\/strong>. .1024\u30d3\u30c3\u30c8\u306e\u9375\u306f\u914d\u9054\u7387\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u306e\u3067\u3001\u79c1\u306f2048\u30d3\u30c3\u30c8\u306b\u983c\u3063\u3066\u3044\u308b\u3002 <strong>\u30c7\u30d5\u30a9\u30eb\u30c8<\/strong>. .\u6b63\u3057\u3044\u30bb\u30ec\u30af\u30bf\u304c\u30d8\u30c3\u30c0\u306b\u306a\u3044\u5834\u5408\u306f\u3001\u9001\u4fe1\u8005\u3068DNS\u304c\u6b63\u3057\u304f\u306a\u308b\u307e\u3067MTA-Config\u3068OpenDKIM-Map\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>\u4e00\u81f4<\/strong>. .\u5236\u9650\u306e\u53b3\u3057\u3044\u500b\u3005\u306e\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u3064\u3044\u3066\u306f\u3001\u7591\u60d1\u3068\u6599\u91d1\u5236\u9650\u3092\u6700\u5c0f\u9650\u306b\u3059\u308b\u305f\u3081\u3001\u9001\u4fe1\u91cf\u3092\u6642\u9593\u7684\u306b\u5206\u6563\u3055\u305b\u308b\u3002 <strong>\u907f\u3051\u308b<\/strong>.<\/p>\n\n<p>\u7f72\u540d\u304c\u30af\u30ea\u30fc\u30f3\u3067\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u30e1\u30fc\u30eb\u304c\u5931\u6557\u3059\u308b\u5834\u5408\u3001\u79c1\u306fDMARC\u30dd\u30ea\u30b7\u30fc\u3068SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u6b21\u306e\u3088\u3046\u306b\u898b\u3066\u3044\u308b\u3002 <strong>\u30c1\u30a7\u30fc\u30f3<\/strong>. .\u591a\u304f\u306e\u5834\u5408\u3001CDN\u3001\u8ee2\u9001\u30b5\u30fc\u30d3\u30b9\u3001\u307e\u305f\u306fCRM\u30b3\u30cd\u30af\u30bf\u30fc\u306f\u3001DKIM\u691c\u8a3c\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u30dc\u30c7\u30a3\u3084\u30d8\u30c3\u30c0\u30fc\u3078\u306e\u5fae\u5999\u306a\u5909\u66f4\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002 <strong>\u4f11\u61a9<\/strong>. .\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u79c1\u306f\u5b89\u5b9a\u3057\u305f\u6b63\u6e96\u5316\u306b\u983c\u308a\u3001\u305d\u308c\u306b\u9069\u5408\u3057\u305f\u4ee3\u66ff\u30bb\u30ec\u30af\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002 <strong>\u65b9\u91dd<\/strong> \u304c\u5f79\u7acb\u3061\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u304c\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u3067\u4f7f\u7528\u3067\u304d\u308b\u30dc\u30c7\u30a3\u30fc\u306e\u66f8\u304d\u63db\u3048\u3001\u30d5\u30c3\u30bf\u30fc\u3001\u30c8\u30e9\u30c3\u30ad\u30f3\u30b0\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u8ffd\u52a0\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3082\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>\u9452\u307f\u308b<\/strong>. .\u4f53\u7cfb\u7684\u306a\u30c1\u30a7\u30c3\u30af\u306f\u3001\u6700\u7d42\u7684\u306b\u6642\u9593\u3092\u7bc0\u7d04\u3057\u3001\u78ba\u5b9f\u306b <strong>\u54c1\u8cea<\/strong>.<\/p>\n\n<h2>\u7dca\u6025\u6642\u306e\u5bfe\u7b56\u5371\u967a\u306b\u3055\u3089\u3055\u308c\u305f\u9375\u306f\u76f4\u3061\u306b\u89e3\u9664\u3059\u308b<\/h2>\n\n<p>\u3082\u3057\u30ad\u30fc\u304c\u5371\u306a\u304f\u306a\u3063\u305f\u3089\u3001\u79c1\u306f\u7528\u610f\u3057\u305f\u30ad\u30fc\u306b\u624b\u3092\u4f38\u3070\u3059\u3002 <strong>\u30ea\u30b6\u30fc\u30d6\u30bb\u30ec\u30af\u30bf\u30fc<\/strong>\u65b0\u3057\u3044\u516c\u958b\u9375\u3092\u767a\u884c\u3057\u3001MTA\u3092\u30ea\u30b6\u30fc\u30d6\u306b\u5207\u308a\u66ff\u3048\u3001\u53e4\u3044\u30bb\u30ec\u30af\u30bf\u3092\u9078\u629e\u3059\u308b\u3002 <strong>p=<\/strong> \u30b7\u30b0\u30ca\u30eb\u3092\u7a7a\u306b\u3059\u308b\u304b\u524a\u9664\u3057\u307e\u3059\u3002\u79c1\u306f\u3001\u30ed\u30b0\u304c\u4e0d\u6b63\u4f7f\u7528\u3092\u793a\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u95a2\u4fc2\u3059\u308b\u30c1\u30fc\u30e0\u306b\u901a\u77e5\u3057\u3001DMARC\u306e\u5931\u6557\u7387\u306e\u76e3\u8996\u3092\u5f37\u5316\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u5b9a\u671f\u7684\u306b\u65b0\u3057\u3044\u30b5\u30fc\u30c9\u30fb\u30bb\u30ec\u30af\u30bf\u3092\u5c0e\u5165\u3057\u3001\u6b21\u306e\u3053\u3068\u3092\u884c\u3044\u307e\u3059\u3002 <strong>\u30d0\u30c3\u30d5\u30a1<\/strong> \u3092\u30ea\u30b9\u30c8\u30a2\u3059\u308b\u3002\u30e9\u30f3\u30d6\u30c3\u30af\u306b\u306f\u3001\u660e\u78ba\u306a\u5f79\u5272\u3001\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u30fb\u30c1\u30e3\u30cd\u30eb\u3001\u627f\u8a8d\u30b9\u30c6\u30c3\u30d7\u304c\u542b\u307e\u308c\u3066\u304a\u308a\u3001\u5bfe\u5fdc\u6642\u9593\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30db\u30fc\u30eb\u30c9<\/strong>.<\/p>\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u9078\u629e\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u6bd4\u8f03<\/h2>\n\n<p>\u30e1\u30fc\u30eb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u95a2\u3057\u3066\u8a00\u3048\u3070\u3001\u79c1\u306f\u30b7\u30fc\u30e0\u30ec\u30b9\u306aDKIM\u30b5\u30dd\u30fc\u30c8\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3001\u3044\u304f\u3064\u304b\u306e <strong>\u30bb\u30ec\u30af\u30bf<\/strong> \u30682048\u30d3\u30c3\u30c8\u306e\u6a19\u6e96\u304c\u3042\u308b\u30021024\u30d3\u30c3\u30c8\u3057\u304b\u8a31\u53ef\u3057\u3066\u3044\u306a\u3044\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u4ee5\u4e0b\u3092\u5371\u3046\u304f\u3059\u308b\u3002 <strong>\u914d\u9001<\/strong> \u305d\u3057\u3066\u8a55\u5224\u3002OpenDKIM\u3092\u7d71\u5408\u3057\u3001\u30b9\u30af\u30ea\u30d7\u30c6\u30a3\u30f3\u30b0\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\u4f01\u696d\u306f\u3001\u5b9f\u8df5\u306b\u304a\u3044\u3066\u591a\u304f\u306e\u3053\u3068\u3092\u7bc0\u7d04\u3067\u304d\u308b\u3002 <strong>\u6642\u9593<\/strong>. .\u30c6\u30b9\u30c8\u3067\u306f\u3001webhoster.de\u306f\u3001\u30b7\u30fc\u30e0\u30ec\u30b9\u306aDKIM\u306e\u7d71\u5408\u3068\u81ea\u52d5\u5316\u53ef\u80fd\u3067\u5370\u8c61\u7684\u3067\u3059\u3002 <strong>\u30d7\u30ed\u30bb\u30b9<\/strong>. .\u4ee5\u4e0b\u306e\u6982\u8981\u306f\u3001\u8cfc\u5165\u306e\u610f\u601d\u6c7a\u5b9a\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u57fa\u6e96\u3092\u660e\u78ba\u306b\u793a\u3057\u3066\u3044\u308b\u3002 <strong>\u30af\u30ea\u30a2<\/strong>:<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc<\/th>\n      <th>DKIM\u30b5\u30dd\u30fc\u30c8<\/th>\n      <th>\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/th>\n      <th>\u4e3b\u306a\u5f37\u307f<\/th>\n      <th>\u8a55\u4fa1<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>webhoster.de<\/td>\n      <td>\u5b8c\u5168\uff08OpenDKIM\uff09<\/td>\n      <td>\u30b9\u30af\u30ea\u30d7\u30c8\u30d0\u30fc\u3068\u7d71\u5408<\/td>\n      <td>2048\u30d3\u30c3\u30c8<\/td>\n      <td><strong>\u30c6\u30b9\u30c8\u52dd\u8005<\/strong> \u7ba1\u7406\u8005\u5411\u3051<\/td>\n    <\/tr>\n    <tr>\n      <td>\u305d\u306e\u4ed6<\/td>\n      <td>\u30d9\u30fc\u30b9<\/td>\n      <td>\u30de\u30cb\u30e5\u30a2\u30eb<\/td>\n      <td>\u591a\u304f\u306e\u5834\u54081024\u30d3\u30c3\u30c8<\/td>\n      <td>\u9650\u5b9a\u8ca9\u58f2 <strong>\u3075\u3055\u308f\u3057\u3044<\/strong><\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u3001DNSSEC\u3001\u30ed\u30ae\u30f3\u30b0<\/h2>\n\n<p>\u8d77\u52d5\u3055\u305b\u308b <strong>\u30c7\u30a3\u30ca\u30bb\u30c3\u30af<\/strong>, DNS\u3067\u516c\u958b\u3055\u308c\u308bDKIM\u30ad\u30fc\u304c\u64cd\u4f5c\u304b\u3089\u4fdd\u8b77\u3055\u308c\u308b\u3088\u3046\u306b\u3001\u5229\u7528\u53ef\u80fd\u306a\u5834\u5408\u306f\u3001DKIM\u30ad\u30fc\u306e\u4fdd\u5b58\u671f\u9593\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u898f\u5236\u3055\u308c\u305f\u74b0\u5883\u3067\u306f\u3001\u30ed\u30b0\u3001DMARC\u30ec\u30dd\u30fc\u30c8\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ed\u30b0\u306e\u4fdd\u5b58\u671f\u9593\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u8ab0\u304c\u3001\u3044\u3064\u3001\u3069\u306e\u30bb\u30ec\u30af\u30bf\u3092\u6709\u52b9\u5316\u3001\u5909\u66f4\u3001\u524a\u9664\u3057\u305f\u304b\u3092\u8a18\u9332\u3057\u307e\u3059\u3002 <strong>\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u5316<\/strong> \u304c\u3042\u308b\u3002\u3053\u306e\u30c8\u30ec\u30fc\u30b5\u30d3\u30ea\u30c6\u30a3\u306f\u3001\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3001\u91d1\u3068\u540c\u3058\u4fa1\u5024\u304c\u3042\u308a\u3001\u5916\u90e8\u304b\u3089\u306e\u60c5\u5831\u53ce\u96c6\u304c\u5bb9\u6613\u306b\u306a\u308b\u3002 <strong>\u76e3\u67fb<\/strong>. .\u79c1\u306f\u307e\u305f\u3001\u65b9\u91dd\u3001\u9593\u9694\u3001\u4e3b\u8981\u306a\u5f37\u307f\u304c\u4f9d\u7136\u3068\u3057\u3066\u30ea\u30b9\u30af\u30fb\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306b\u5408\u81f4\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u6bce\u5e74\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092DevOps\u30d7\u30ed\u30bb\u30b9\u306b\u7d44\u307f\u8fbc\u3080<\/h2>\n\n<p>\u79c1\u306fCI\/CD\u306b\u30ad\u30fc\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u7d71\u5408\u3057\u3001\u30d3\u30eb\u30c9\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u304c\u30ad\u30fc\u3092\u751f\u6210\u3057\u3001DNS\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u5145\u586b\u3057\u3001MTA\u8a2d\u5b9a\u3092\u5236\u5fa1\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8<\/strong>. .\u5404\u672c\u756a\u7a3c\u50cd\u306e\u524d\u306b\u3001DNS\u306e\u53ef\u8996\u6027\u3068\u30d8\u30c3\u30c0\u30fc\u7f72\u540d\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u691c\u8a3c\u6bb5\u968e\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002 <strong>\u3079\u3093\u3051\u3044\u3058\u307e<\/strong>. .\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u4e88\u5b9a\u5916\u306e\u5236\u9650\u3084\u9045\u5ef6\u3092\u8ab2\u3057\u305f\u5834\u5408\u306b\u5099\u3048\u3066\u3001\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u6e96\u5099\u3057\u3066\u304a\u304f\u3002 <strong>\u30bb\u30c3\u30c8<\/strong>. .\u3055\u3089\u306b\u3001\u5e741\u56de\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30ec\u30d3\u30e5\u30fc\u3092\u8a08\u753b\u3057\u3001\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb\u3001\u4e3b\u8981\u6570\u5024\u3001\u5831\u544a\u306e\u8cea\u3092\u5206\u6790\u3057\u3066\u3044\u308b\u3002 <strong>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/strong>. 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