{"id":19561,"date":"2026-05-31T18:18:04","date_gmt":"2026-05-31T16:18:04","guid":{"rendered":"https:\/\/webhosting.de\/dkim-canonicalization-signaturstabilitaet-mailserver-absicherung\/"},"modified":"2026-05-31T18:18:04","modified_gmt":"2026-05-31T16:18:04","slug":"dkim-%e6%ad%a3%e8%a6%8f%e5%8c%96-%e7%bd%b2%e5%90%8d-%e5%ae%89%e5%ae%9a%e6%80%a7-%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/dkim-canonicalization-signaturstabilitaet-mailserver-absicherung\/","title":{"rendered":"\u5b89\u5168\u306a\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u305f\u3081\u306eDKIM\u6b63\u898f\u5316\u3068\u7f72\u540d\u306e\u5b89\u5b9a\u6027"},"content":{"rendered":"<p>\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u306e\u304b\u30012\u3064\u306e\u6587\u7ae0\u3067\u8aac\u660e\u3057\u3088\u3046\u3002 <strong>DKIM\u306e\u6b63\u898f\u5316<\/strong> \u30d8\u30c3\u30c0\u30fc\u3068\u30dc\u30c7\u30a3\u30fc\u3092\u6a19\u6e96\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u308f\u305a\u304b\u306a\u8f38\u9001\u306e\u5909\u66f4\u306b\u3082\u7f72\u540d\u304c\u6709\u52b9\u3067\u3042\u308a\u7d9a\u3051\u308b\u3088\u3046\u306b\u3057\u305f\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066 <strong>\u7f72\u540d<\/strong> \u6697\u53f7\u30c1\u30a7\u30c3\u30af\u3092\u5371\u967a\u306b\u3055\u3089\u3059\u3053\u3068\u306a\u304f\u3001\u5b9f\u969b\u306e\u30e1\u30fc\u30eb\u30fb\u30c1\u30e3\u30cd\u30eb\u3067\u9ad8\u3044\u914d\u9054\u7387\u3092\u9054\u6210\u3059\u308b\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<p>\u3059\u3050\u306b\u3067\u3082\u59cb\u3081\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u4ee5\u4e0b\u306e\u4e3b\u8981\u306a\u70b9\u3092\u307e\u3068\u3081\u3066\u304a\u3053\u3046\u3002 <strong>\u6b63\u898f\u5316<\/strong> \u305d\u3057\u3066\u30b7\u30b0\u30cd\u30c1\u30e3\u30fc\u306e\u5b89\u5b9a\u6027\u3002.<\/p>\n<ul>\n  <li><strong>\u30ea\u30e9\u30c3\u30af\u30b9<\/strong> \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u8a73\u7d30\u304c\u540c\u3058\u306b\u306a\u308a\u3001\u6709\u52b9\u306a\u30c1\u30a7\u30c3\u30af\u306e\u53ef\u80fd\u6027\u304c\u9ad8\u307e\u308b\u3002.<\/li>\n  <li><strong>\u30b7\u30f3\u30d7\u30eb<\/strong> \u306f\u53b3\u683c\u3067\u3001\u308f\u305a\u304b\u306a\u5909\u5316\u3067\u3088\u308a\u65e9\u304f\u58ca\u308c\u308b\u3002.<\/li>\n  <li><strong>\u30d8\u30c3\u30c0\u30fc<\/strong> \u901a\u5e38\u3001\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u305f\u614b\u5ea6\u3067\u63a5\u3057\u3001\u4f53\u3082\u30ea\u30e9\u30c3\u30af\u30b9\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002.<\/li>\n  <li><strong>\u8ee2\u9001<\/strong>, \u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3068\u30aa\u30fc\u30c8\u30ec\u30b9\u30dd\u30f3\u30c0\u30fc\u306e\u30ea\u30c3\u30d7\u30eb\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3002.<\/li>\n  <li><strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> SPF\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u3001\u4e00\u8cab\u6027\u306e\u3042\u308bDKIM\u30c1\u30a7\u30c3\u30af\u304b\u3089\u5229\u76ca\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/li>\n<\/ul>\n<p>\u79c1\u304c\u3053\u308c\u3089\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u4e00\u8cab\u3057\u3066\u5b9f\u884c\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u5c0f\u3055\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u5909\u66f4\u304c\u983b\u7e41\u306b\u8d77\u3053\u308b\u304b\u3089\u3067\u3042\u308b\u3002 <strong>\u59a5\u5f53\u6027<\/strong> \u7f72\u540d\u306e\u7279\u306b\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3084\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3067\u306f <strong>\u30e2\u30fc\u30c9<\/strong> \u914d\u4fe1\u307e\u305f\u306f\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0\u7d4c\u7531\u30b9\u30da\u30fc\u30b9\u3068\u6539\u884c\u306e\u53d6\u308a\u6271\u3044\u3092\u7de9\u548c\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u30c1\u30a7\u30c3\u30af\u304c\u3088\u308a\u78ba\u5b9f\u306b\u306a\u308a\u307e\u3059\u3002 <strong>\u7f72\u540d<\/strong>. .\u540c\u6642\u306b\u3001\u64cd\u4f5c\u306e\u4f59\u5730\u304c\u306a\u3044\u3088\u3046\u306b\u3001\u95a2\u9023\u3059\u308b\u30d8\u30c3\u30c0\u30fc\u306b\u76ee\u3092\u5149\u3089\u305b\u3066\u3044\u308b\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067 <strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/strong> \u305d\u3057\u3066\u65e5\u5e38\u4f7f\u7528\u3078\u306e\u9069\u5408\u6027\u3002.<\/p>\n\n<h2>DKIM\u306e\u6b63\u898f\u5316\u3068\u306f\u3069\u3046\u3044\u3046\u610f\u5473\u3067\u3059\u304b\uff1f<\/h2>\n\n<p>\u6b63\u898f\u5316\u3068\u306f\u3001\u7f72\u540d\u306e\u524d\u306b\u30d8\u30c3\u30c0\u30fc\u3068\u30dc\u30c7\u30a3\u30fc\u3092\u7d71\u4e00\u3057\u305f\u5f62\u306b\u3059\u308b\u305f\u3081\u306b\u79c1\u304c\u4f7f\u3063\u3066\u3044\u308b\u30eb\u30fc\u30eb\u306e\u3053\u3068\u3067\u3042\u308b\u3002 <strong>\u5be9\u67fb<\/strong> \u30bf\u30fc\u30b2\u30c3\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u3067\u306f\u3001\u540c\u3058\u30d0\u30a4\u30c8\u5217\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306f\u30d8\u30c3\u30c0\u30fc\u3092\u633f\u5165\u3057\u3001\u30a2\u30fc\u30ab\u30a4\u30d6\u30b7\u30b9\u30c6\u30e0\u306f\u6539\u884c\u306b\u89e6\u308c\u3001\u30b9\u30ad\u30e3\u30ca\u30fc\u306f\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5909\u66f4\u3059\u308b\u3002 <strong>\u30ea\u30e9\u30c3\u30af\u30b9<\/strong>. .\u30b7\u30f3\u30d7\u30eb\u30fb\u30e2\u30fc\u30c9\u306f\u307b\u3068\u3093\u3069\u9038\u8131\u3092\u8a31\u5bb9\u3057\u306a\u3044\u304c\u3001\u30ea\u30e9\u30c3\u30af\u30b9\u30fb\u30e2\u30fc\u30c9\u306f\u30b9\u30da\u30fc\u30b9\u3068\u30d6\u30ec\u30fc\u30af\u3092\u6a19\u6e96\u5316\u3059\u308b\u3002 <strong>\u7f72\u540d<\/strong> \u306f\u3001\u5916\u89b3\u4e0a\u306e\u5909\u66f4\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u6709\u52b9\u3067\u3042\u308b\u3002DKIM\u7f72\u540d\u306e\u4e2d\u3067\u3001\u79c1\u306fc=header\/body\u3068\u3057\u3066\u30e2\u30fc\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u3002 <strong>\u30dc\u30c7\u30a3<\/strong>. .\u79c1\u304crelaxed\/relaxed\u3092\u597d\u3080\u306e\u306f\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30c1\u30a7\u30fc\u30f3\u306b\u6cbf\u3063\u305f\u5178\u578b\u7684\u306a \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u8a02\u6b63\u3067\u306f\u8aa4\u8b66\u5831\u304c\u767a\u751f\u3057\u306a\u3044\u304b\u3089\u3067\u3042\u308b\u3002\u306a\u305c\u306a\u3089\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30fb\u30c1\u30a7\u30fc\u30f3\u306b\u6cbf\u3063\u305f\u5178\u578b\u7684\u306a \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u8a02\u6b63\u306f\u8aa4\u5831\u3092\u767a\u751f\u3055\u305b\u306a\u3044\u304b\u3089\u3067\u3042\u308b\u3002 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>-\u4e00\u65b9\u3001\u4e0d\u5fc5\u8981\u306a\u62d2\u5426\u306f\u3042\u307e\u308a\u8d77\u3053\u3089\u306a\u3044\u3002.<\/p>\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\/05\/sichere-mailserver-dkim-4821.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u8010\u4e45\u6027\u306e\u305f\u3081\u306b\u6b63\u898f\u5316\u304c\u91cd\u8981\u306a\u7406\u7531<\/h2>\n\n<p>\u6700\u5927\u9650\u306e\u4e00\u8cab\u6027\u3092\u76ee\u6307\u3057\u3066\u3044\u308b\u3002 <strong>\u7f72\u540d<\/strong>, \u306a\u305c\u306a\u3089\u3001\u6709\u52b9\u306a\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308b\u305f\u3073\u306b\u3001\u53d7\u4fe1\u8005\u3068\u306e\u4fe1\u983c\u95a2\u4fc2\u304c\u69cb\u7bc9\u3055\u308c\u308b\u304b\u3089\u3067\u3059\u3002\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u7d4c\u7531\u306e\u8ee2\u9001\u3067\u306f\u3001\u4ef6\u540d\u306b\u63a5\u982d\u8f9e\u3092\u5165\u308c\u305f\u308a\u3001\u30d5\u30c3\u30bf\u30fc\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3057\u307e\u3059\u3002 <strong>\u69cb\u6210<\/strong> \u305d\u306e\u5834\u5408\u3001\u3059\u3050\u306b\u58ca\u308c\u3066\u3057\u307e\u3046\u3002\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306f\u30d8\u30c3\u30c0\u30fc\u3068\u30dc\u30c7\u30a3\u3092\u90e8\u5206\u7684\u306b\u66f8\u304d\u63db\u3048\u308b\u306e\u3067\u3001relaxed\u306e\u65b9\u304c\u30af\u30c3\u30b7\u30e7\u30f3\u306b\u306a\u308a\u3001\u7121\u52b9\u306a\u7f72\u540d\u304c\u5c11\u306a\u304f\u306a\u308b\u3002\u30a2\u30fc\u30ab\u30a4\u30d6\u30b7\u30b9\u30c6\u30e0\u3084\u30aa\u30fc\u30c8\u30ec\u30b9\u30dd\u30f3\u30c0\u30fc\u306f\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u3059\u308b\u306e\u3067\u3001\u79c1\u306f\u610f\u8b58\u7684\u306b\u7f72\u540d\u3055\u308c\u305f\u30d8\u30c3\u30c0\u30fc\u3092\u9078\u629e\u3057\u3001relaxed\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002DKIM\u304c\u6709\u52b9\u306a\u307e\u307e\u3067\u3042\u308b\u3053\u3068\u304c\u591a\u3051\u308c\u3070\u591a\u3044\u307b\u3069\u3001\u79c1\u306eDKIM\u306b\u5bfe\u3059\u308b\u8a55\u4fa1\u306f\u660e\u78ba\u306b\u306a\u308b\u3002 <strong>\u30c9\u30e1\u30a4\u30f3<\/strong> \u305d\u3057\u3066\u3001\u6b63\u5f53\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30b9\u30d1\u30e0\u3067\u7d42\u308f\u308b\u3053\u3068\u304c\u5c11\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d6\u30e9\u30f3\u30c9\u306e\u8a55\u5224\u304c\u5b88\u3089\u308c\u3001\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u30fb\u30c1\u30e3\u30cd\u30eb\u304c\u6df7\u4e71\u3059\u308b\u3053\u3068\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n<h2>\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u305f\u30b7\u30f3\u30d7\u30eb\u306a\u4ed5\u4e8b\u306e\u8a73\u7d30<\/h2>\n\n<p>\u79c1\u306e\u6c7a\u5b9a\u304c\u518d\u73fe\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u306f\u6b63\u5178\u5316\u306e\u7279\u5b9a\u306e\u30eb\u30fc\u30eb\u3092\u5b88\u3063\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li><strong>\u30d8\u30c3\u30c0\u30fc\u306e\u30ea\u30e9\u30c3\u30af\u30b9<\/strong>\u30d8\u30c3\u30c0\u30fc\u540d\u3092\u5c0f\u6587\u5b57\u306b\u3057\u3001\u30b3\u30ed\u30f3\u306e\u5468\u308a\u306e\u4f59\u8a08\u306a\u7a7a\u767d\u3092\u524a\u9664\u3057\u3001\u9023\u7d9a\u3059\u308b\u884c\u30921\u884c\u306b\u6298\u308a\u7573\u307f\u3001\u30d8\u30c3\u30c0\u30fc\u5024\u5185\u306e\u8907\u6570\u306e\u7a7a\u767d\u3092\u6b63\u78ba\u306b1\u3064\u306e\u7a7a\u767d\u306b\u3059\u308b\u3002\u7f72\u540d\u3055\u308c\u308b\u30d8\u30c3\u30c0\u30fc\u306e\u9806\u5e8f\u306fh=\u30ea\u30b9\u30c8\u306b\u5f93\u3063\u3066\u4fdd\u6301\u3055\u308c\u3001\u91cd\u8907\u306f\u305d\u3053\u3067\u6307\u5b9a\u3055\u308c\u305f\u9806\u5e8f\u3067\u8003\u616e\u3055\u308c\u308b\u3002.<\/li>\n  <li><strong>\u30b7\u30f3\u30d7\u30eb\u306a\u30d8\u30c3\u30c0\u30fc<\/strong>\u79c1\u306f\u5404\u30d0\u30a4\u30c8\u5217\u3092\u9001\u4fe1\u3055\u308c\u305f\u3068\u304a\u308a\u306b\u6b8b\u3059\u3002\u4e2d\u9593\u99c5\u3067\u30b9\u30da\u30fc\u30b9\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3001\u6539\u884c\u3057\u305f\u308a\u3001\u518d\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3057\u305f\u308a\u3059\u308b\u305f\u3073\u306b\u3001\u30c1\u30a7\u30c3\u30af\u306f\u4e2d\u65ad\u3055\u308c\u308b\u3002.<\/li>\n  <li><strong>\u4f53\u304c\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u3066\u3044\u308b<\/strong>CRLF\u3067\u884c\u3092\u533a\u5207\u308a\u3001\u884c\u672b\u306e\u7a7a\u767d\u3092\u524a\u308a\u3001\u5358\u8a9e\u3068\u5358\u8a9e\u306e\u9593\u306e\u7a7a\u767d\u30921\u3064\u306b\u6e1b\u3089\u3057\u3001\u672c\u6587\u306e\u6700\u5f8c\u306b\u4f59\u5206\u306a\u7a7a\u884c\u3092\u524a\u9664\u3059\u308b\u3002\u5b8c\u5168\u306b\u7a7a\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u306f1\u884c\u306e\u7a7a\u884c\u3068\u3057\u3066\u6b63\u898f\u5316\u3055\u308c\u308b\u3002.<\/li>\n  <li><strong>\u30b7\u30f3\u30d7\u30eb\u306a\u30dc\u30c7\u30a3<\/strong>\u884c\u672b\u3092\u542b\u3080\u3059\u3079\u3066\u306e\u884c\u306e\u5b8c\u5168\u4e00\u81f4\u304c\u5fc5\u8981\u3067\u3059\u3002\u5909\u63db\u3055\u308c\u305f\u884c\u672b\u3067\u3082\u30c1\u30a7\u30c3\u30af\u306b\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002.<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30eb\u30fc\u30eb\u306f\u3001\u30d8\u30c3\u30c0\u30fc\u306e\u6298\u308a\u305f\u305f\u307f\u3001\u7a7a\u767d\u306e\u4fee\u6b63\u30017bit\/8bit\u5909\u63db\u3001\u7570\u306a\u308bMTA\u5b9f\u88c5\u3068\u3044\u3063\u305f\u5178\u578b\u7684\u306a\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306e\u5909\u66f4\u3092\u53cd\u6620\u3057\u3066\u3044\u308b\u3002relaxed\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u610f\u5473\u7684\u306a\u64cd\u4f5c\u3092\u96a0\u853d\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u5916\u898b\u7684\u306a\u9038\u8131\u3092\u9632\u3044\u3067\u3044\u308b\u3002.<\/p>\n\n<h2>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a\u30ea\u30e9\u30c3\u30af\u30b9 vs \u30b7\u30f3\u30d7\u30eb<\/h2>\n\n<p>\u306a\u305c\u306a\u3089\u3001\u30d8\u30c3\u30c0\u30fc\u540d\u306e\u5927\u6587\u5b57\u8868\u8a18\u3084\u8ffd\u52a0\u30b9\u30da\u30fc\u30b9\u3068\u3044\u3063\u305f\u5c0f\u3055\u306a\u3053\u3068\u304c\u3001\u30d8\u30c3\u30c0\u30fc\u306e\u7f72\u540d\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b\u3089\u3060\u3002 <strong>\u5be9\u67fb<\/strong> \u3067\u306a\u3044\u3068\u4e0d\u5fc5\u8981\u306b\u50be\u3044\u3066\u3057\u307e\u3046\u3002\u6539\u884c\u304c\u6b63\u898f\u5316\u3055\u308c\u3001\u884c\u672b\u306e\u30b9\u30da\u30fc\u30b9\u304c\u524a\u3089\u308c\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5e83\u3044\u30b9\u30da\u30fc\u30b9\u304c\u5f97\u3089\u308c\u308b\u304b\u3089\u3060\u3002 <strong>\u59a5\u5f53\u6027<\/strong> \u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u9069\u5fdc\u5f8c\u3002c=relaxed\/relaxed\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u6697\u53f7\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u5f31\u3081\u308b\u3053\u3068\u306a\u304f\u3001\u7570\u7a2e\u30a4\u30f3\u30d5\u30e9\u3067\u6700\u3082\u4fe1\u983c\u3067\u304d\u308b\u7d50\u679c\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002\u79c1\u306fSimple\u3092\u7279\u306b\u53b3\u5bc6\u306b\u7ba1\u7406\u3055\u308c\u305f\u5185\u90e8\u74b0\u5883\u3067\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30d1\u30b9<\/strong>-\u30b9\u30c6\u30fc\u30b7\u30e7\u30f3\u3002\u30aa\u30fc\u30d7\u30f3\u306a\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u306f\u3001\u5358\u7d14\u306a\u3053\u3068\u306f\u4e0d\u5fc5\u8981\u306a\u30ea\u30b9\u30af\u3092\u3082\u305f\u3089\u3057\u3001\u6709\u52b9\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u5931\u6557\u3059\u308b\u305f\u3081\u3001\u8cac\u4efb\u3042\u308b\u30c1\u30fc\u30e0\u3092\u30a4\u30e9\u30a4\u30e9\u3055\u305b\u308b\u3002\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304b\u3089\u306e\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u5bfe\u5fdc\u3059\u308b\u4eba\u306f\u3001\u30ea\u30e9\u30c3\u30af\u30b9\uff0f\u30ea\u30e9\u30c3\u30af\u30b9\u306e\u65b9\u304c\u306f\u308b\u304b\u306b\u30ea\u30e9\u30c3\u30af\u30b9\u3067\u304d\u3001\u30b3\u30b9\u30c8\u3082\u7bc0\u7d04\u3067\u304d\u308b\u3002 <strong>\u30b5\u30dd\u30fc\u30c8<\/strong>-\u6642\u9593\u3060\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\/05\/dkim_meeting_stabil4567.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u6280\u8853\u7684\u57fa\u790e\uff1aDKIM\u7f72\u540d\u3068\u30ad\u30fc<\/h2>\n\n<p>\u79c1\u306f\u3001\u9001\u4fe1\u30b5\u30fc\u30d0\u30fc\u4e0a\u306e\u79d8\u5bc6\u9375\u3068\u3001\u4ee5\u4e0b\u306eDNS TXT\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u306e\u516c\u958b\u9375\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30c9\u30e1\u30a4\u30f3\u30ad\u30fc<\/strong>, \u53d7\u4fe1\u30b7\u30b9\u30c6\u30e0\u304c\u691c\u8a3c\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3042\u308b\u3002DNS\u30a8\u30f3\u30c8\u30ea\u306b\u306f\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u3001\u9375\u306e\u30bf\u30a4\u30d7\u3001Base64\u30a8\u30f3\u30b3\u30fc\u30c9\u3055\u308c\u305f\u516c\u958b\u9375\u304c\u542b\u307e\u308c\u308b\u3002 <strong>\u30ad\u30fc<\/strong>; \u79d8\u5bc6\u9375\u306f\u30b5\u30fc\u30d0\u306b\u5b89\u5168\u306b\u6b8b\u3063\u3066\u3044\u308b\u3002\u53d7\u4fe1\u8005\u304cDKIM\u7f72\u540d\u3092\u767a\u898b\u3059\u308b\u3068\u3059\u3050\u306b\u3001DNS\u30ec\u30b3\u30fc\u30c9\u306b\u554f\u3044\u5408\u308f\u305b\u3001\u7f72\u540d\u3068\u30c9\u30e1\u30a4\u30f3\u304c\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u3053\u306e\u30c1\u30a7\u30fc\u30f3\u306f\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3001\u9577\u3055\u3001\u30bb\u30ec\u30af\u30bf\u540d\u3092\u9069\u5207\u306b\u5b9a\u7fa9\u3057\u3001\u304b\u3064 <strong>\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0<\/strong> \u79c1\u7684\u8cc7\u6599\u306e\u5168\u4f53\u50cf\u306b\u3064\u3044\u3066\u306f\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a <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\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30de\u30c8\u30ea\u30c3\u30af\u30b9<\/a>, \u3053\u308c\u306f\u3001SPF\u3001DKIM\u3001DMARC\u3001BIMI\u306e\u5f79\u5272\u3092\u660e\u78ba\u306b\u6574\u7406\u3057\u305f\u3082\u306e\u3067\u3042\u308b\u3002\u3053\u308c\u306f\u3001SPF\u3001DKIM\u3001DMARC\u3001BIMI\u306e\u6697\u53f7\u5316\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u304c <strong>\u30e1\u30c3\u30bb\u30fc\u30b8<\/strong> \u8ffd\u8de1\u53ef\u80fd\u3067\u6c38\u4e45\u306b\u691c\u8a3c\u53ef\u80fd\u3067\u3042\u308b\u3002.<\/p>\n\n<h2>\u30d8\u30c3\u30c0\u30fc\u30ea\u30b9\u30c8\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3001\u5b89\u5168\u306a\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a<\/h2>\n\n<p>\u79c1\u306fc=\u3060\u3051\u3067\u306a\u304f\u3001\u4ed6\u306eDKIM\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3088\u3063\u3066\u3082\u7f72\u540d\u306e\u5b89\u5b9a\u6027\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li><strong>h=<\/strong> \u306f\u3001\u7f72\u540d\u3055\u308c\u305f\u30d8\u30c3\u30c0\u30fc\u3092\u3001\u305d\u308c\u3089\u304c\u4f7f\u7528\u3055\u308c\u308b\u6b63\u78ba\u306a\u9806\u5e8f\u3067\u30ea\u30b9\u30c8\u3057\u3066\u3044\u308b\u3002\u79c1\u306f\u3001From\u3001To\u3001Subject\u3001Date\u3001Message-ID\u3001MIME-Version\u3068\u3044\u3063\u305f\u5b89\u5b9a\u3057\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u542b\u3081\u3001\u307b\u3068\u3093\u3069\u5e38\u306b\u9014\u4e2d\u3067\u5909\u5316\u3059\u308b\u63ee\u767a\u6027\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\uff08Received\u3001Return-Path\u3001Authentication-Results\u3001X-Header\u306a\u3069\uff09\u306f\u7701\u3044\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>d=<\/strong> \u306f\u7f72\u540d\u30c9\u30e1\u30a4\u30f3\u3092\u6307\u5b9a\u3059\u308b\u3002DMARC\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3067\u306f\u3001\u53d7\u4fe1\u8005\u304cID\u3092\u660e\u78ba\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\uff08\u307e\u305f\u306f\u9069\u5207\u306a\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\uff09\u3067d=\u3092\u9078\u629e\u3059\u308b\u3002.<\/li>\n  <li><strong>s=<\/strong> \u306f\u30bb\u30ec\u30af\u30bf\u3092\u8868\u3057\u307e\u3059\u3002\u79c1\u306f\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3084\u30de\u30eb\u30c1\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30fb\u30b7\u30ca\u30ea\u30aa\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u65e5\u4ed8\/\u30b5\u30fc\u30d3\u30b9\u53c2\u7167\uff08\u4f8b\uff1as=mail2026\uff09\u3092\u542b\u3080\u8aac\u660e\u7684\u306a\u540d\u524d\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002.<\/li>\n  <li><strong>t=<\/strong> \u306b\u306f\u7f72\u540d\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304c\u542b\u307e\u308c\u308b\u3001, <strong>x=<\/strong> \u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u6709\u52b9\u671f\u9650\u3002\u53e4\u3044\u3001\u9045\u308c\u305f\u30e1\u30fc\u30eb\u3092\u4e0d\u5fc5\u8981\u306b\u3072\u3063\u304f\u308a\u8fd4\u3055\u306a\u3044\u3088\u3046\u306b\u3001x=\u4e2d\u7a0b\u5ea6\u306b\u8a2d\u5b9a\u3057\u305f\u3002.<\/li>\n  <li><strong>bh=<\/strong> \u306f\u6b63\u898f\u5316\u3055\u308c\u305f\u30dc\u30c7\u30a3\u306e\u30cf\u30c3\u30b7\u30e5\u3067\u3042\u308a\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5b8c\u5168\u6027\u3092\u4fdd\u8b77\u3059\u308b\u3002. <strong>b=<\/strong> \u306f\u3001\u9078\u629e\u3055\u308c\u305f\u30d8\u30c3\u30c0\u30fc\u3068\u30dc\u30c7\u30a3\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u4ecb\u3057\u305f\u5b9f\u969b\u306e\u7f72\u540d\u3067\u3042\u308b\u3002.<\/li>\n  <li><strong>l=<\/strong> \u90e8\u5206\u7684\u306a\u30dc\u30c7\u30a3\u7f72\u540d\u306f\u30ea\u30d7\u30ec\u30a4\u653b\u6483\u306e\u30ea\u30b9\u30af\u3092\u9ad8\u3081\u308b\u306e\u3067\u3001\u79c1\u306f\u30dc\u30c7\u30a3\u9577\u30bf\u30b0\u3092\u4f7f\u7528\u3057\u306a\u3044\u3002\u79c1\u306f\u3001\u660e\u78ba\u306a\u5b8c\u5168\u6027\u306e\u305f\u3081\u306b\u30d5\u30eb\u30dc\u30c7\u30a3\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u597d\u3080\u3002.<\/li>\n  <li><strong>z=<\/strong> (\u30b3\u30d4\u30fc\u3055\u308c\u305f\u30d8\u30c3\u30c0\u30fc\uff09\u306f\u4e00\u822c\u7684\u306b\u7701\u7565\u3055\u308c\u308b\u3002\u4ed8\u52a0\u4fa1\u5024\u306f\u307b\u3068\u3093\u3069\u306a\u3044\u304c\u3001\u30c7\u30fc\u30bf\u4fdd\u8b77\u3068\u5b89\u5b9a\u6027\u306e\u30ea\u30b9\u30af\u304c\u9ad8\u307e\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002.<\/li>\n<\/ul>\n<p>\u9375\u306e\u5f37\u5ea6\u306b\u306fRSA 2048\u30d3\u30c3\u30c8\u3092\u4f7f\u3063\u3066\u3044\u308b\u3002\u3053\u308c\u306f\u5e83\u7bc4\u306a\u4e92\u63db\u6027\u304c\u3042\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3082\u9ad8\u304f\u3001\u901a\u5e38\u306f\u65ad\u7247\u5316\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u306a\u304fDNS\u306eTXT\u30ec\u30b3\u30fc\u30c9\u306b\u53ce\u307e\u308b\u3002\u9577\u3059\u304e\u308b\u9375\u306fDNS\u3068\u30ea\u30be\u30eb\u30d0\u306b\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u77ed\u3059\u304e\u308b\u9375\uff081024\uff09\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u3002\u516c\u958b\u9375\u3092255\u6587\u5b57\u306e\u6587\u5b57\u5217\u306b\u304d\u308c\u3044\u306b\u5206\u5272\u3057\u3001\u6b63\u3057\u3044\u9006\u30ab\u30f3\u30de\u306b\u6ce8\u610f\u3057\u3001\u4e0d\u7528\u610f\u306a\u30b9\u30da\u30fc\u30b9\u3092\u907f\u3051\u308b\u3002.<\/p>\n\n<h2>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u5b9f\u88c5<\/h2>\n\n<p>\u79c1\u306f\u30ad\u30fc\u751f\u6210\u304b\u3089\u59cb\u3081\u3001\u660e\u78ba\u306a\u30bb\u30ec\u30af\u30bf\u540d\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u306e\u30bb\u30ec\u30af\u30bf\u540d\u3092\u4fdd\u6301\u3059\u308b\u3002 <strong>\u30d5\u30a1\u30a4\u30eb<\/strong> \u304c\u6df7\u3056\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u30b5\u30fc\u30d0\u30fc\u4e0a\u3067\u53b3\u5bc6\u306b\u5206\u96e2\u3055\u308c\u3066\u3044\u308b\u3002\u305d\u306e\u5f8c\u3001\u516c\u958b\u9375\u3092DNS\u306b\u516c\u958b\u3057\u3001\u89e3\u6c7a\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3001\u30bb\u30df\u30b3\u30ed\u30f3\u3001\u9006\u30ab\u30f3\u30de\u3001\u304a\u3088\u3073 <strong>\u8a18\u9332<\/strong>. .\u30b5\u30fc\u30d0\u30fc\u306e\u8a2d\u5b9a\u3067\u3001\u3069\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u7f72\u540d\u3059\u308b\u304b\u3001\u3069\u306e\u30d8\u30c3\u30c0\u30fc\u304c\u7f72\u540d\u306b\u542b\u307e\u308c\u308b\u304b\u3001\u3069\u306e\u6b63\u898f\u5316\uff08\u901a\u5e38\u306fc=relaxed\/relaxed\uff09\u3092\u4f7f\u3046\u304b\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u305d\u306e\u5f8c\u3001\u3055\u307e\u3056\u307e\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3001\u30d8\u30c3\u30c0\u30fc\u3001\u672c\u6587\u306e\u30cf\u30c3\u30b7\u30e5\u3001\u4f7f\u7528\u3055\u308c\u305f\u6b63\u898f\u5316\u3092\u5206\u6790\u3057\u307e\u3059\u3002 <strong>\u30bb\u30ec\u30af\u30bf\u30fc<\/strong>. .\u904b\u7528\u4e2d\u3001\u79c1\u306f\u914d\u4fe1\u7387\u3001\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u30eb\u30fc\u30d7\u3001DMARC\u30ec\u30dd\u30fc\u30c8\u3092\u76e3\u8996\u3057\u3001\u7570\u5e38\u304c\u3042\u308c\u3070\u6b63\u898f\u5316\u3092\u8abf\u6574\u3057\u305f\u308a\u3001\u30d8\u30c3\u30c0\u30fc\u30ea\u30b9\u30c8\u3092\u9069\u5fdc\u3055\u305b\u305f\u308a\u3059\u308b\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u6280\u8853\u7684\u306a\u57fa\u76e4\u3092\u30af\u30ea\u30fc\u30f3\u306a\u72b6\u614b\u306b\u4fdd\u3061 <strong>\u8a55\u4fa1<\/strong> \u7406\u89e3\u3057\u3084\u3059\u3044\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\/05\/mailsecurity-dkim-stability-2473.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>MIME\u3001\u6587\u5b57\u30bb\u30c3\u30c8\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5909\u63db<\/h2>\n\n<p>\u79c1\u306f\u3001MTA\u3084\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u304c\u30b3\u30f3\u30c6\u30f3\u30c4\u8ee2\u9001\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3084\u6587\u5b57\u30bb\u30c3\u30c8\u3001\u6539\u884c\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3092\u8a08\u753b\u3057\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li><strong>Quoted-Printable\u3068Base64\u306e\u6bd4\u8f03<\/strong>\u3053\u306e2\u3064\u306e\u9593\u306e\u5909\u63db\u306f\u4e00\u822c\u7684\u3067\u3042\u308b\u3002Relaxed-body\u306e\u6b63\u898f\u5316\u306f\u3001\u7a7a\u767d\u3084\u884c\u672b\u306e\u9055\u3044\u3092\u6355\u3089\u3048\u308b\u304c\u3001\u610f\u5473\u7684\u306a\u5909\u66f4\uff08MIME\u30d1\u30fc\u30c4\u306e\u518d\u30d1\u30c3\u30b1\u30fc\u30b8\u306a\u3069\uff09\u306f\u7f72\u540d\u3092\u58ca\u3059\u3002.<\/li>\n  <li><strong>7bit\/8bit\u5909\u63db<\/strong>8bit\u30927bit\u306b\u5909\u63db\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u3082\u3042\u308b\u3002Relaxed\u306f\u884c\u672b\u3092\u6b63\u898f\u5316\u3059\u308b\u304c\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u518d\u30a8\u30f3\u30b3\u30fc\u30c9\u3055\u308c\u305f\u308a\u30e9\u30c3\u30d7\u3055\u308c\u305f\u308a\u3059\u308b\u5834\u5408\u306f\u3001\u4e2d\u9593\u5b9b\u5148\u3067\u306e\u518d\u7f72\u540d(\u4f8b\u3048\u3070\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306e\u5834\u5408)\u304b\u3001\u771f\u6b63\u6027\u306e\u9023\u9396\u306e\u305f\u3081\u306eARC\u3060\u3051\u304c\u52a9\u3051\u306b\u306a\u308b\u3002.<\/li>\n  <li><strong>\u672b\u5c3e\u306e\u6539\u884c<\/strong>\u79c1\u306f\u3001\u672c\u6587\u306e\u6700\u5f8c\u304cCRLF\u3067\u6b63\u3057\u304f\u7d42\u308f\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002Relaxed\u306f\u4f59\u5206\u306a\u7d42\u4e86\u884c\u3092\u524a\u9664\u3057\u307e\u3059\u304c\u3001simple\u306f\u524a\u9664\u3057\u307e\u305b\u3093\u3002.<\/li>\n  <li><strong>\u7a7a\u3063\u307d\u306e\u6b7b\u4f53<\/strong>relax\u3067\u306f\u3001\u7a7a\u306e\u30dc\u30c7\u30a3\u306f1\u884c\u306e\u7a7a\u884c\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3002\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u9664\u5916\u3059\u308b\u305f\u3081\u306b\u3001\u30c6\u30b9\u30c8\u3067\u306f\u3053\u308c\u3092\u660e\u793a\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002.<\/li>\n<\/ul>\n<p>HTML\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u3064\u3044\u3066\u306f\u3001\u30a4\u30f3\u30e9\u30a4\u30ca\u30fc\u3001DLP\u30b9\u30ad\u30e3\u30ca\u30fc\u3001\u30ea\u30f3\u30af\u30c1\u30a7\u30c3\u30ab\u30fc\u304c\u5c5e\u6027\u3084\u7a7a\u767d\u3092\u5909\u66f4\u3057\u306a\u3044\u304b\u76e3\u8996\u3057\u3066\u3044\u308b\u3002\u3082\u3057\u305d\u3046\u306a\u3089\u3001\u7f72\u540d\u3055\u308c\u3001\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30d8\u30c3\u30c0\u30fc\u306e\u6570\u3092\u5c11\u306a\u304f\u3057\u3001\u7f8e\u5bb9\u7684\u306a\u4ecb\u5165\u3092\u6700\u5c0f\u9650\u306b\u3059\u308b\u305f\u3081\u306brelaxed\/relaxed\u3092\u4e3b\u5f35\u3059\u308b\u3002.<\/p>\n\n<h2>\u5178\u578b\u7684\u306a\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3092\u907f\u3051\u308b<\/h2>\n\n<p>\u4e0d\u9069\u5207\u306a\u6539\u884c\u3001\u30bb\u30df\u30b3\u30ed\u30f3\u3084\u5f15\u7528\u7b26\u306e\u6b20\u843d\u306b\u3088\u308a\u3001\u53d7\u4fe1\u8005\u304c\u30d1\u30d6\u30ea\u30c3\u30af\u30fb\u30ec\u30b3\u30fc\u30c9\u3092\u8a8d\u8b58\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u3002 <strong>\u30ad\u30fc<\/strong> \u3092\u304d\u308c\u3044\u306b\u30ed\u30fc\u30c9\u3059\u308b\u3002\u307e\u305f\u3001DNS\u3068\u30b5\u30fc\u30d0\u30fc\u30d5\u30a1\u30a4\u30eb\u306e\u540c\u671f\u304c\u3068\u308c\u3066\u3044\u306a\u3044\u3068\u3001\u30ad\u30fc\u5909\u66f4\u6642\u306b\u540c\u671f\u304c\u3068\u308c\u306a\u3044\u305f\u3081\u306b\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u3002 <strong>\u8d70\u308b<\/strong>. .simple\/simple\u306e\u3088\u3046\u306a\u53b3\u3057\u3059\u304e\u308b\u6b63\u898f\u5316\u306f\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3001\u30a2\u30fc\u30ab\u30a4\u30d6\u3067\u3059\u3050\u306b\u5931\u6557\u3057\u3001\u4e0d\u5fc5\u8981\u306b\u914d\u4fe1\u6027\u3092\u640d\u306a\u3044\u307e\u3059\u3002\u983b\u7e41\u306b\u5909\u66f4\u3055\u308c\u308b\u591a\u304f\u306e\u30d8\u30c3\u30c0\u306b\u7f72\u540d\u3059\u308b\u3053\u3068\u306f\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u59a5\u5f53\u6027\u3092\u5371\u3046\u304f\u3059\u308b\u306e\u3067\u3001\u540c\u69d8\u306b\u5371\u967a\u3067\u3059\u3002 <strong>\u7f72\u540d<\/strong> \u8106\u5f31\u3067\u3042\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u30d0\u30e9\u30f3\u30b9\u306e\u53d6\u308c\u305f\u30d8\u30c3\u30c0\u30fc\u30ea\u30b9\u30c8\u3092\u4f7f\u3044\u3001From\u3001To\u3001Subject\u3001Date\u3068\u9069\u5207\u306a\u88dc\u8db3\u306b\u7126\u70b9\u3092\u5f53\u3066\u3001\u30d8\u30c3\u30c0\u30fc\u3068 <strong>\u30dc\u30c7\u30a3<\/strong> \u6e96\u5099\u304c\u3067\u304d\u3066\u3044\u308b\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u9023\u9396\u53cd\u5fdc\u3092\u9632\u304e\u3001\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u6642\u9593\u3092\u7bc0\u7d04\u3059\u308b\u3002.<\/p>\n\n<h2>\u30d8\u30c3\u30c0\u30fc\u3068\u30dc\u30c7\u30a3\u306e\u6b63\u898f\u5316\u306e\u6bd4\u8f03<\/h2>\n\n<p>\u6c7a\u65ad\u3092\u5177\u4f53\u7684\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u5404\u30e2\u30fc\u30c9\u306e\u52b9\u679c\u3092\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u8868\u306b\u307e\u3068\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u7528\u7684\u306a\u30d2\u30f3\u30c8\u3092\u52a0\u3048\u305f\u3002 <strong>\u30bb\u30ec\u30af\u30b7\u30e7\u30f3<\/strong>. .\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3067\u3001\u81ea\u5206\u306b\u5408\u3063\u305f\u30e2\u30fc\u30c9\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u5468\u8fba\u74b0\u5883<\/strong> \u6b7b\u89d2\u3092\u4f5c\u308b\u3053\u3068\u306a\u304f\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30a2\u30b9\u30da\u30af\u30c8<\/th>\n      <th>\u30b7\u30f3\u30d7\u30eb\uff08\u30d8\u30c3\u30c0\u30fc\uff0f\u30dc\u30c7\u30a3\uff09<\/th>\n      <th>\u30ea\u30e9\u30c3\u30af\u30b9\uff08\u30d8\u30c3\u30c0\u30fc\uff0f\u30dc\u30c7\u30a3\uff09<\/th>\n      <th>\u5b9f\u8df5\u7de8<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u30b9\u30da\u30fc\u30b9\u306b\u5bfe\u3059\u308b\u8010\u6027<\/td>\n      <td>\u4f4e\u304f\u3001\u9055\u3044\u306f\u3059\u3050\u306b\u58ca\u308c\u308b<\/td>\n      <td>\u9ad8\u304f\u3001\u8907\u6570\u306e\u30b9\u30da\u30fc\u30b9\u304c\u6a19\u6e96\u5316\u3055\u308c\u3066\u3044\u308b<\/td>\n      <td>\u6df7\u5408\u8def\u7dda\u306e\u5834\u5408 <strong>\u30ea\u30e9\u30c3\u30af\u30b9<\/strong> \u597d\u610f<\/td>\n    <\/tr>\n    <tr>\n      <td>\u6539\u884c\u306e\u51e6\u7406<\/td>\n      <td>\u53b3\u683c\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u6b63\u78ba\u306b\u30d5\u30a3\u30c3\u30c8\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/td>\n      <td>\u4e00\u822c\u7684\u306a\u30d0\u30ea\u30a2\u30f3\u30c8\u3092\u6b63\u898f\u5316<\/td>\n      <td>\u518d\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u53ef\u80fd\u306a\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4 <strong>\u30ea\u30e9\u30c3\u30af\u30b9<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u8ee2\u9001\uff0f\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8<\/td>\n      <td>\u9aa8\u6298\u306e\u30ea\u30b9\u30af\u304c\u9ad8\u3044<\/td>\n      <td>\u304b\u306a\u308a\u9ad8\u3044\u62b5\u6297<\/td>\n      <td>\u4ef6\u540d\u306e\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3068\u30d5\u30c3\u30bf\u30fc <strong>\u548c\u3089\u3052\u308b<\/strong><\/td>\n    <\/tr>\n    <tr>\n      <td>\u5185\u90e8\u7ba1\u7406\u3055\u308c\u305f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af<\/td>\n      <td>\u30db\u30e2\u30b8\u30cb\u30a2\u30b9\u30fb\u30c8\u30e9\u30c3\u30af\u306b\u6700\u9069<\/td>\n      <td>\u53ef\u80fd\u6027\u3082\u3042\u308b<\/td>\n      <td>\u30b7\u30f3\u30d7\u30eb\u306f\u3001\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u306e\u307f\u4f7f\u7528\u3059\u308b\u3002 <strong>\u99c5<\/strong> \u77e5\u3089\u308c\u3066\u3044\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>\u63a8\u5968\u3055\u308c\u308b\u7d44\u307f\u5408\u308f\u305b<\/td>\n      <td>c=\u30b7\u30f3\u30d7\u30eb\/\u307b\u3068\u3093\u3069\u5f79\u306b\u7acb\u305f\u306a\u3044<\/td>\n      <td>c=\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u3066\u3044\u308b\/\u307b\u3068\u3093\u3069\u306e\u30b1\u30fc\u30b9\u3067\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u3066\u3044\u308b<\/td>\n      <td>\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u305f\u30d8\u30c3\u30c0\u30fc\u3001\u30dc\u30c7\u30a3 <strong>\u30ea\u30e9\u30c3\u30af\u30b9<\/strong><\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<p>\u5408\u6210\u30c1\u30a7\u30c3\u30af\u306f\u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3067\u6a5f\u80fd\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u304b\u3089\u3060\u3002 <strong>\u30eb\u30fc\u30c8<\/strong> \u30de\u30c3\u30d7\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u79c1\u306f\u307e\u305f\u3001\u4e2d\u9593\u5c40\u304c\u65b0\u3057\u3044\u30d8\u30c3\u30c0\u30fc\u3092\u633f\u5165\u3057\u305f\u308a\u3001\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5909\u66f4\u3057\u305f\u308a\u3057\u306a\u3044\u304b\u5b9a\u671f\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3001\u305d\u308c\u3092\u8abf\u6574\u3059\u308b\u3002 <strong>\u69cb\u6210<\/strong> \u305d\u306e\u5f8c.<\/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\/05\/mailserver_sicherheit_2345.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3001DMARC\u3001SPF\u306e\u76f8\u4e92\u4f5c\u7528<\/h2>\n\n<p>\u79c1\u306fDMARC\u306e\u30ec\u30dd\u30fc\u30c8\u3092\u5206\u6790\u3057\u3001DKIM\u3084SPF\u304c\u53d7\u4fe1\u5074\u3067\u6709\u52b9\u306b\u306a\u308b\u983b\u5ea6\u3092\u78ba\u8a8d\u3057\u3001\u305d\u306e\u983b\u5ea6\u3092\u4fee\u6b63\u3057\u307e\u3059\u3002 <strong>\u8a2d\u5b9a<\/strong> \u305d\u306e\u7d50\u679cSPF\u304c\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3067\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u306f\u3001\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u5148\u306e\u30b5\u30fc\u30d0\u30fc\u304cSPF\u30ec\u30b3\u30fc\u30c9\u306b\u306a\u3044\u305f\u3081\u3067\u3042\u308a\u3001\u305d\u306e\u305f\u3081\u4fe1\u983c\u6027\u306e\u9ad8\u3044DKIM\u30c1\u30a7\u30c3\u30af\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002 <strong>\u30b5\u30a6\u30f3\u30c9<\/strong> \u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u3002\u79c1\u306f\u9069\u5207\u306aDMARC\u30dd\u30ea\u30b7\u30fc\u3092\u4f7f\u3063\u3066\u3001SPF\u3084DKIM\u3092\u901a\u904e\u3057\u306a\u3044\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u8005\u304c\u3069\u306e\u3088\u3046\u306b\u51e6\u7406\u3059\u308b\u304b\u3092\u898f\u5236\u3057\u3066\u3044\u308b\u3002\u305d\u306e\u969b\u3001Header-From\u3001DKIM-d\u3001\u304a\u3088\u3073DKIM-d\u306e\u9593\u306e\u30c9\u30e1\u30a4\u30f3\u5272\u308a\u5f53\u3066\u304c\u3001SPF\u307e\u305f\u306fDKIM\u3092\u901a\u904e\u3057\u306a\u3044\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u8005\u304c\u3069\u306e\u3088\u3046\u306b\u51e6\u7406\u3059\u308b\u304b\u3092\u898f\u5236\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u306f\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30fb\u30eb\u30fc\u30eb\u3092\u5b88\u3063\u3066\u3044\u308b\u3002 <strong>SPF<\/strong>-mailfrom\u304c\u5408\u3046\u3002\u7d30\u304b\u3044\u5236\u5fa1\u306b\u306f <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-spf-%e3%82%a2%e3%83%a9%e3%82%a4%e3%83%a1%e3%83%b3%e3%83%88-dmarc-%e3%83%9d%e3%83%aa%e3%82%b7%e3%83%bc%e3%82%ac%e3%82%a4%e3%83%89\/\">DMARC\u30dd\u30ea\u30b7\u30fc\u30ac\u30a4\u30c9<\/a>, \u306b\u3001\u5178\u578b\u7684\u306a\u30b7\u30ca\u30ea\u30aa\u3068\u526f\u4f5c\u7528\u306b\u3064\u3044\u3066\u6982\u8aac\u3057\u3066\u3044\u308b\u3002DKIM\u304c\u6b63\u898f\u5316\u3092\u901a\u3058\u3066\u3088\u308a\u4e00\u8cab\u3057\u3066\u5b9f\u884c\u3055\u308c\u308c\u3070\u3055\u308c\u308b\u307b\u3069\u3001\u305d\u306e\u52b9\u679c\u306f\u3088\u308a\u78ba\u5b9f\u306b\u306a\u308b\u3002 <strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u65e5\u5e38\u751f\u6d3b\u306e\u4e2d\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\/05\/mailserver-sicherheit-4501.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u6b63\u898f\u5316\u306b\u304a\u3051\u308bARC\u3068\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8<\/h2>\n\n<p>\u79c1\u306f\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3084\u8ee2\u9001\u30b5\u30fc\u30d3\u30b9\u304c\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3092\u8003\u616e\u3057\u3066\u304a\u308a\u3001\u5143\u306eDKIM\u7f72\u540d\u304c\u7121\u52b9\u306b\u306a\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3002\u65e5\u5e38\u751f\u6d3b\u3067\u306f\u30012\u3064\u306e\u6226\u7565\u304c\u5f79\u7acb\u3061\u307e\u3059\uff1a<\/p>\n<ul>\n  <li><strong>\u518d\u5951\u7d04<\/strong> \u30ea\u30b9\u30c8\u307e\u305f\u306f\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306b\u3088\u3063\u3066\uff1a\u4e2d\u9593\u5c40\u306f\u5143\u306e\u7f72\u540d\u3092\u81ea\u8eab\u306e\u7f72\u540d\u306b\u7f6e\u304d\u63db\u3048\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u53d7\u4fe1\u8005\u306e\u5b8c\u5168\u6027\u306f\u4fdd\u305f\u308c\u308b\u304c\u3001\u5143\u306e\u9001\u4fe1\u8005\u3068\u306eDMARC\u306e\u6574\u5408\u6027\u306f\u3057\u3070\u3057\u3070\u5931\u308f\u308c\u308b\u3002.<\/li>\n  <li><strong>ARC\uff08\u8a8d\u8a3c\u3055\u308c\u305f\u53d7\u4fe1\u30c1\u30a7\u30fc\u30f3\uff09<\/strong>ARC\u306f\u3001\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u914d\u9001\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u7f72\u540d\u3055\u308c\u305f\u30c1\u30a7\u30fc\u30f3\u306b\u4fdd\u5b58\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u58ca\u308c\u305fDKIM\u7f72\u540d\u306f\u4fdd\u5b58\u3055\u308c\u307e\u305b\u3093\u304c\u3001\u53d7\u4fe1\u8005\u306f\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u4fe1\u983c\u6027\u3092\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/li>\n<\/ul>\n<p>\u5b9f\u969b\u306b\u306f\u3001\u6b63\u898f\u5316\u3092\u7de9\u3084\u304b\u306b\u3057\u3001\u7f72\u540d\u4ed8\u304d\u30d8\u30c3\u30c0\u30fc\u3092\u5805\u7262\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u6e1b\u3089\u3057\u3001\u30ea\u30b9\u30c8\uff0f\u30d5\u30a9\u30ef\u30fc\u30c0\u30fc\u306b\u3064\u3044\u3066\u306fARC\u304b\u518d\u7f72\u540d\u306b\u983c\u3063\u3066\u3044\u308b\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u7f72\u540d\u306e\u4e00\u8cab\u6027\u3068\u3001\u30eb\u30fc\u30c8\u306b\u6cbf\u3063\u305f\u8ffd\u8de1\u53ef\u80fd\u306a\u771f\u6b63\u6027\u306e\u30c1\u30a7\u30fc\u30f3\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u8907\u6570\u306e\u7f72\u540d\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3<\/h2>\n\n<p>\u4f8b\u3048\u3070\u3001\u79c1\u306e\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u7f72\u540d\u3068\u3001\u5951\u7d04\u3057\u3066\u3044\u308b\u914d\u9001\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304b\u3089\u306e\u7f72\u540d\u306a\u3069\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u5909\u66f4\u3084\u518d\u7f72\u540d\u306b\u3088\u3063\u3066\u7f72\u540d\u304c\u7121\u52b9\u306b\u306a\u3063\u305f\u5834\u5408\u306b\u5099\u3048\u3066\u5197\u9577\u6027\u3092\u6301\u305f\u305b\u3066\u3044\u308b\u3002DMARC\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u5c11\u306a\u304f\u3068\u30821\u3064\u306e\u7f72\u540d\u304c\u30c9\u30e1\u30a4\u30f3\uff08\u8a72\u5f53\u3059\u308b\u5834\u5408\u306f\u5bfe\u5fdc\u3059\u308bd=\u3068\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u30dd\u30ea\u30b7\u30fc\uff09\u304b\u3089\u898b\u3048\u308b\u3082\u306e\u3068\u4e00\u81f4\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u74b0\u5883\u3067\u306f\u3001\u5404\u9001\u4fe1ID\u3092\u72ec\u81ea\u306e\u30bb\u30ec\u30af\u30bf\u3068\u9375\u3067\u7f72\u540d\u3057\u3001\u9375\u3068DNS\u30ec\u30b3\u30fc\u30c9\u3092\u304d\u308c\u3044\u306b\u5206\u96e2\u3057\u3001\u8cac\u4efb\u3092\u660e\u78ba\u306b\u6587\u66f8\u5316\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\uff1a\u30d8\u30c3\u30c0\u30fc\u306e\u5206\u6790\u3068\u5178\u578b\u7684\u306a\u6307\u6a19<\/h2>\n\n<p>\u79c1\u306f\u6545\u969c\u306b\u5bfe\u3057\u3066\u69cb\u9020\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u53d6\u308b\uff1a<\/p>\n<ul>\n  <li>\u79c1\u306f\u30c1\u30a7\u30c3\u30af\u3059\u308b <strong>\u8a8d\u8a3c\u7d50\u679c<\/strong>-\u53d7\u4fe1\u5074\u306e\u30d8\u30c3\u30c0\u30fc\uff1a\u3069\u306e\u30e1\u30bd\u30c3\u30c9\uff08DKIM\/SPF\/DMARC\uff09\u304c\u30d1\u30b9\u3057\u3001\u3069\u308c\u304c\u5931\u6557\u3057\u3001\u3069\u306e\u30bb\u30ec\u30af\u30bf\u304c\u4f7f\u308f\u308c\u305f\u304b\uff1f<\/li>\n  <li>\u6bd4\u8f03\u3059\u308b <strong>bh=<\/strong> \u305d\u3057\u3066 <strong>b=<\/strong>\u30dc\u30c7\u30a3\u30fb\u30cf\u30c3\u30b7\u30e5\uff08bh=\uff09\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u884c\u672b\u306e\u5909\u66f4\u3001\u884c\u672b\u306e\u30b9\u30da\u30fc\u30b9\u3001\u633f\u5165\u3055\u308c\u305f\u30d5\u30c3\u30bf\u30fc\u30fb\u30c6\u30ad\u30b9\u30c8\u3092\u63a2\u3059\u3002.<\/li>\n  <li>\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>h=<\/strong>-\u30ea\u30b9\u30c8\uff1alist:\u305d\u3053\u306b\u30ea\u30b9\u30c8\u3055\u308c\u3066\u3044\u308b\u30d8\u30c3\u30c0\u30fc\u304c\u3001\u9014\u4e2d\u3067\u6298 \u308a\u76f4\u3055\u308c\u305f\u308a\u3001\u4e26\u3079\u66ff\u3048\u3089\u308c\u305f\u308a\u3001\u8ffd\u52a0\u3055\u308c\u305f\u308a\u3057\u305f\u304b\uff1fRelaxed\u306f\u7a7a\u767d\u3092\u30a4\u30f3\u30bf\u30fc\u30bb\u30d7\u30c8\u3057\u307e\u3059\u304c\u3001\u5b9a\u7fa9\u3055\u308c\u305f\u30eb\u30fc\u30eb\u5916\u306e\u30bb\u30de\u30f3\u30c6\u30a3\u30c3\u30af\u306a\u5909\u66f4\u3084\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u5909\u66f4\u306f\u30a4\u30f3\u30bf\u30fc\u30bb\u30d7\u30c8\u3057\u307e\u305b\u3093\u3002.<\/li>\n  <li>\u79c1\u306f\u3053\u3046\u898b\u308b\u3002 <strong>c=<\/strong>\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306f\u518d\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3057\u3066\u3044\u308b\u304c\u3001\u30c6\u30b9\u30c8\u306f\u30b7\u30f3\u30d7\u30eb\uff0f\u30b7\u30f3\u30d7\u30eb\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u304b\uff1f\u305d\u308c\u304b\u3089relaxed\/relaxed\u306b\u5207\u308a\u66ff\u3048\u3066\u3001\u3082\u3046\u4e00\u5ea6\u30c6\u30b9\u30c8\u3059\u308b\u3002.<\/li>\n  <li>\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>DNS\u30ad\u30fc<\/strong>TXT\u30ec\u30b3\u30fc\u30c9\u3092\u5b8c\u5168\u304b\u3064\u6b63\u78ba\u306b\u691c\u7d22\u3067\u304d\u308b\u304b\u3001\u3059\u3079\u3066\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u304c\u6b63\u3057\u304f\u5f15\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u30bb\u30ec\u30af\u30bf\u306f\u6b63\u3057\u3044\u304b\u3002<\/li>\n<\/ul>\n<p>\u3044\u304f\u3064\u304b\u306eMTA\u30c1\u30a7\u30fc\u30f3\u306f\u4ed6\u306eMTA\u30c1\u30a7\u30fc\u30f3\u3088\u308a\u3082\u300c\u53b3\u683c\u300d\u3067\u3042\u308b\u305f\u3081\u3001\u8907\u6570\u306e\u5927\u624b\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u30e1\u30fc\u30eb\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3067\u3001\u79c1\u306f\u3088\u308a\u8fc5\u901f\u306b\u30d1\u30bf\u30fc\u30f3\u3092\u8a8d\u8b58\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u79c1\u306f\u767a\u898b\u3057\u305f\u3053\u3068\u3092\u3001\u6b63\u898f\u5316\u3001\u30d8\u30c3\u30c0\u30fc\u30ea\u30b9\u30c8\u3001\u30d7\u30ed\u30bb\u30b9\u306e\u8abf\u6574\uff08\u9001\u4fe1\u524d\u306e\u7a7a\u767d\u306e\u5e73\u6ed1\u5316\u306a\u3069\uff09\u306b\u53d6\u308a\u5165\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u30ad\u30fc\u30fb\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u30ac\u30d0\u30ca\u30f3\u30b9<\/h2>\n\n<p>\u79c1\u306fDKIM\u30ad\u30fc\u3092\u4f53\u7cfb\u7684\u306b\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3057\u3001\u53e4\u3044 <strong>\u30ad\u30fc<\/strong> \u304c\u4e0d\u5fc5\u8981\u306b\u9577\u3044\u9593DNS\u306b\u5b58\u5728\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u3001\u30ea\u30b9\u30af\u304c\u9ad8\u307e\u308b\u3002\u79c1\u306f\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u524d\u306b\u3001\u3059\u3079\u3066\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u4e21\u65b9\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u79fb\u884c\u30d5\u30a7\u30fc\u30ba\u3092\u6e96\u5099\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u30bb\u30ec\u30af\u30bf\u30fc<\/strong> \u306f\u6709\u52b9\u3067\u3059\u3002\u5207\u308a\u66ff\u3048\u5f8c\u3001\u3059\u3079\u3066\u306e\u767a\u4fe1\u30b7\u30b9\u30c6\u30e0\u304c\u65b0\u3057\u3044\u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3046\u3088\u3046\u306b\u306a\u3063\u305f\u3089\u3001\u3059\u3050\u306b\u53e4\u3044\u516c\u958b\u9375\u3092\u524a\u9664\u3059\u308b\u3002\u79c1\u306f\u3053\u306e\u30eb\u30fc\u30c1\u30f3\u3092\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u306e\u30ea\u30de\u30a4\u30f3\u30c0\u30fc\u3001\u6587\u66f8\u5316\u3055\u308c\u305f\u8cac\u4efb\u3001\u305d\u3057\u3066\u4ee5\u4e0b\u306e\u30c6\u30b9\u30c8\u30d7\u30e9\u30f3\u3068\u30ea\u30f3\u30af\u3055\u305b\u3066\u3044\u308b\u3002 <strong>\u518d\u767a<\/strong>. .\u5b9f\u88c5\u306b\u306f <a 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