{"id":18232,"date":"2026-03-09T11:52:19","date_gmt":"2026-03-09T10:52:19","guid":{"rendered":"https:\/\/webhosting.de\/spf-dkim-dmarc-hosting-email-sicherheit-serverauth-server\/"},"modified":"2026-03-09T11:52:19","modified_gmt":"2026-03-09T10:52:19","slug":"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","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-hosting-email-sicherheit-serverauth-server\/","title":{"rendered":"SPF DKIM DMARC\u30db\u30b9\u30c6\u30a3\u30f3\u30b0: \u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u3092\u6700\u9069\u306b\u8a2d\u5b9a\u3059\u308b"},"content":{"rendered":"<p>\u79c1\u306f\u3001\u914d\u4fe1\u53ef\u80fd\u6027\u3068\u4fdd\u8b77\u304c\u78ba\u5b9f\u306b\u5411\u4e0a\u3059\u308b\u3088\u3046\u306b\u3001\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3067\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002 <strong>spf dkim dmarc \u30db\u30b9\u30c6\u30a3\u30f3\u30b0<\/strong> \u3068\u30af\u30ea\u30fc\u30f3\u306aDNS\u30dd\u30ea\u30b7\u30fc\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u5408\u6cd5\u7684\u306a\u9001\u4fe1\u8005\u3092\u660e\u78ba\u306b\u8a8d\u8b58\u3057\u3001\u653b\u6483\u8005\u3092\u6392\u9664\u3059\u308b\u305f\u3081\u306b\u3001\u30ec\u30b3\u30fc\u30c9\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3001\u30ec\u30dd\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u6bb5\u968e\u7684\u306b\u30ac\u30a4\u30c9\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>SPF\u30dd\u30ea\u30b7\u30fc<\/strong> \u627f\u8a8d\u3055\u308c\u305f\u6d3e\u9063\u30b5\u30fc\u30d0\u30fc\u3092\u5236\u9650\u3057\u3001\u306a\u308a\u3059\u307e\u3057\u3092\u963b\u6b62\u3059\u308b\u3002.<\/li>\n  <li><strong>DKIM\u7f72\u540d<\/strong> \u30b3\u30f3\u30c6\u30f3\u30c4\u3068\u9001\u4fe1\u8005\u306e\u5b8c\u5168\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3002.<\/li>\n  <li><strong>DMARC\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/strong> \u306f\u30dd\u30ea\u30b7\u30fc\u3001\u30d7\u30ed\u30c6\u30af\u30b7\u30e7\u30f3\u3001\u30ec\u30dd\u30fc\u30c8\u3092\u517c\u306d\u5099\u3048\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>DNS\u306e\u54c1\u8cea<\/strong> TTL\u304c\u77ed\u3044\u305f\u3081\u3001\u5909\u66f4\u304c\u5bb9\u6613\u3067\u3042\u308b\u3002.<\/li>\n  <li><strong>\u5831\u544a<\/strong> \u8aa4\u7528\u3084\u8a2d\u5b9a\u30df\u30b9\u3092\u767a\u898b\u3059\u308b\u3002.<\/li>\n<\/ul>\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3044\u3066SPF\u3001DKIM\u3001DMARC\u304c\u5fc5\u9808\u3067\u3042\u308b\u7406\u7531<\/h2>\n\n<p>\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u306f\u30e1\u30fc\u30eb\u74b0\u5883\u306b\u5bfe\u3059\u308b\u653b\u6483\u306e\u5927\u534a\u3092\u5360\u3081\u3066\u3044\u308b\u3002 <strong>\u8a8d\u8a3c<\/strong> \u5e0c\u671b\u306e\u4ee3\u308f\u308a\u306bSPF\u3001DKIM\u3001DMARC\u304c\u306a\u3051\u308c\u3070\u3001\u8ab0\u3082\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u9001\u4fe1\u8005\u3068\u3057\u3066\u4f7f\u7528\u3057\u3001\u30b9\u30d1\u30e0\u3001\u30c7\u30fc\u30bf\u76d7\u96e3\u3001\u8a55\u5224\u306e\u4f4e\u4e0b\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u5927\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306f\u3001\u6b20\u843d\u3057\u305f\u3001\u307e\u305f\u306f\u4e0d\u6b63\u78ba\u306a\u30dd\u30ea\u30b7\u30fc\u3092\u53b3\u3057\u304f\u8a55\u4fa1\u3057\u307e\u3059\u3002\u3053\u308c\u304c\u3001\u79c1\u304c\u3059\u3079\u3066\u306e\u65b0\u3057\u3044\u30c9\u30e1\u30a4\u30f3\u306b\u57fa\u672c\u7684\u306a\u4fdd\u8b77\u3092\u3059\u3050\u306b\u63d0\u4f9b\u3059\u308b\u7406\u7531\u3067\u3059\u3002\u30af\u30ea\u30fc\u30f3\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306f\u53d7\u4fe1\u306e\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u3001\u30d0\u30a6\u30f3\u30b9\u3092\u5927\u5e45\u306b\u6e1b\u3089\u3057\u307e\u3059\u3002DMARC\u30ec\u30dd\u30fc\u30c8\u306f\u307e\u305f\u3001DMARC\u306e\u8a2d\u5b9a\u306b\u554f\u984c\u304c\u306a\u3044\u304b\u3069\u3046\u304b\u306e\u5ba2\u89b3\u7684\u306a\u30b7\u30b0\u30ca\u30eb\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002 <strong>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/strong> \u307e\u305f\u306f\u8a50\u6b3a\u5e2b\u304c\u3042\u306a\u305f\u306e\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3092\u60aa\u7528\u3057\u3088\u3046\u3068\u3059\u308b\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\/03\/email-authentifizierung-server-7082.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>SPF\u3092\u7406\u89e3\u3057\u3001\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b<\/h2>\n\n<p>SPF\u306f\u3001\u3069\u306e\u30db\u30b9\u30c8\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u304b\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002 <strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/strong>. .\u5178\u578b\u7684\u306a\u8981\u7d20\u306f\u3001ip4\/ip6\u3001include\u3001a\u3001mx\u3001a final\u3067\u3001soft\u307e\u305f\u306fhard fail\u304c\u3064\u304f\u3002\u5165\u9580\u6bb5\u968e\u3067\u306f\u3001\u6b63\u5f53\u306a\u914d\u9001\u3092\u9664\u5916\u3057\u306a\u3044\u3088\u3046\u306b\u201c~all \u201d\u3067\u59cb\u3081\u308b\u3002\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306fSPF\u3092\u7834\u58ca\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u79c1\u306f\u5e38\u306bSPF\u3068DKIM\u3092\u7d44\u307f\u5408\u308f\u305b\u3001\u30d5\u30a9\u30ef\u30fc\u30c0\u30fc\u306e\u5834\u5408\u306b\u30c1\u30a7\u30c3\u30af\u304c\u5931\u6557\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u900f\u660e\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u3001\u79c1\u306f\u7d71\u5408\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u793e\u5185\u306e\u5909\u66f4\u30ed\u30b0\u306b\u8a18\u9332\u3057\u3066\u3044\u308b\u3002 <strong>\u8a18\u9332<\/strong> \u65b0\u3057\u3044\u30c4\u30fc\u30eb\u306e\u305f\u3081\u306b\u3002.<\/p>\n\n<p>\u305d\u306e\u80cc\u666f\u3092\u30b3\u30f3\u30d1\u30af\u30c8\u306b\u8aad\u307f\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\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\/\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30de\u30c8\u30ea\u30c3\u30af\u30b9<\/a> \u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u305d\u306e\u30bf\u30b9\u30af\u3092\u69cb\u9020\u7684\u306b\u5206\u985e\u3057\u305f\u3082\u306e\u3002.<\/p>\n\n<h2>\u8907\u96d1\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306e\u305f\u3081\u306eSPF\u30e6\u30cb\u30c3\u30c8<\/h2>\n\n<p>\u5927\u898f\u6a21\u306a\u74b0\u5883\u3067\u306f\u3001\u4e2d\u592e\u306e\u30dd\u30ea\u30b7\u30fc\u304c\u672c\u5f53\u306b\u7d99\u627f\u3055\u308c\u308b\u5834\u5408\u306e\u307f \u201credirect=\u201d\u3092\u4f7f\u3044\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306b\u67d4\u8edf\u6027\u3092\u4fdd\u3064\u305f\u3081\u306b \u201cinclude=\u201d\u306b\u3053\u3060\u308f\u308b\u3002\u3088\u304f\u898b\u304b\u3051\u308b \u201cptr \u201d\u306f\u4f7f\u308f\u306a\u3044\u3002\u3053\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u306f\u4e0d\u6b63\u78ba\u3067\u3042\u308a\u3001\u30d5\u30a3\u30eb\u30bf\u30fc\u3067\u306f\u3082\u306f\u3084\u63a8\u5968\u3055\u308c\u3066\u3044\u306a\u3044\u3002\u8907\u96d1\u306aDNS\u5fdc\u7b54\u306f\u4e0d\u5fc5\u8981\u306a\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u751f\u6210\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u3001\u201cexists \u201d\u306f\u63a7\u3048\u3081\u306b\u4f7f\u3044\u307e\u3059\u3002\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u306a\u3044\u30db\u30b9\u30c8\u306b\u5bfe\u3057\u3066\u306f\u3001HELO\/EHLO\u540d\uff08\u4f8b\u3048\u3070mailhost.example.tld\u306b \u201cv=spf1 -all \u201d\u3092\u4ed8\u3051\u305f\u3082\u306e\uff09\u306b\u5bfe\u3057\u3066\u5225\u306eSPF\u3092\u767a\u884c\u3057\u3001\u53d7\u4fe1\u8005\u304cHELO\u306e\u540c\u4e00\u6027\u3092\u78ba\u5b9f\u306b\u30c1\u30a7\u30c3\u30af\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30d7\u30ed\u30d0\u30a4\u30c0\u306eIP\u304c\u5909\u308f\u308b\u3068\u8a8d\u8a3c\u304c\u6c17\u3065\u304b\u308c\u305a\u306b\u58ca\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u79c1\u306f\u300c\u30d5\u30e9\u30c3\u30c8\u5316\u300d\uff08IP\u306b\u542b\u307e\u308c\u308b\u3082\u306e\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\uff09\u3092\u5236\u5fa1\u3055\u308c\u305f\u65b9\u6cd5\u3067\u306e\u307f\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002IPv6\u3092\u4f7f\u3063\u305f\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30fb\u30a4\u30f3\u30d5\u30e9\u306b\u3064\u3044\u3066\u306f\u3001ip6\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u660e\u793a\u3057\u3001\u8ca0\u306e\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u5f8c\u65b9\u89e3\u6c7a\uff08PTR\uff09\u3068HELO\u540d\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u3064\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>DKIM: \u7f72\u540d\u3001\u30bb\u30ec\u30af\u30bf\u3001\u9375\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9<\/h2>\n\n<p>DKIM\u306f\u9001\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u6697\u53f7\u7684\u306b\u7f72\u540d\u3059\u308b\u305f\u3081\u3001\u53d7\u4fe1\u8005\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5909\u66f4\u3092\u5373\u5ea7\u306b\u8a8d\u8b58\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u4fe1\u983c\u6027\u304c\u78ba\u4fdd\u3055\u308c\u308b\u3002 <strong>\u30a2\u30a4\u30c7\u30f3\u30c6\u30a3\u30c6\u30a3<\/strong> \u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u79c1\u306f2048\u30d3\u30c3\u30c8\u306e\u9375\u3092\u4f7f\u3044\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066 \u201cmarketing \u201d\u3084 \u201cservice \u201d\u3068\u3044\u3063\u305f\u500b\u5225\u306e\u30bb\u30ec\u30af\u30bf\u3067\u7570\u306a\u308b\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30fb\u30c1\u30e3\u30f3\u30cd\u30eb\u3092\u5206\u3051\u3066\u3044\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7f72\u540d\u306b\u5931\u6557\u3057\u305f\u308a\u3001\u30ad\u30fc\u3092\u66f4\u65b0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u3001\u5404\u30b7\u30b9\u30c6\u30e0\u3092\u8fc5\u901f\u306b\u5206\u96e2\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u96fb\u5b50\u30e1\u30fc\u30eb\u3092\u6271\u3046\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306b\u3064\u3044\u3066\u306f\u3001\u5c0f\u3055\u306a\u5909\u66f4\u3067\u7f72\u540d\u304c\u7121\u52b9\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u3001\u30d8\u30c3\u30c0\u30fc\u306e\u6b63\u898f\u5316\u3092\u7de9\u548c\uff0f\u7de9\u548c\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u5b9a\u671f\u7684\u306a\u9375\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u60aa\u7528\u3055\u308c\u308b\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3057 <strong>\u8a55\u5224<\/strong> \u30af\u30ea\u30fc\u30f3\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\/03\/EmailAuthMeetingSetup_7634.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>DKIM\u306e\u5b9f\u969b\uff1a\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30cf\u30c3\u30b7\u30e5\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/h2>\n\n<p>\u5805\u7262\u306a\u7f72\u540d\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u30cf\u30c3\u30b7\u30e5\u300csha256\u300d\u3092\u9078\u629e\u3057\u3001\u5c11\u306a\u304f\u3068\u3082From\u3001Date\u3001To\u3001Subject\u3001Message-ID\u306b\u7f72\u540d\u3059\u308b\u3002\u53ef\u80fd\u3067\u3042\u308c\u3070\u3001\u305d\u306e\u5f8c\u306e\u5909\u66f4\u304c\u76ee\u7acb\u3064\u3088\u3046\u306b\u3001\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u30d8\u30c3\u30c0\u30fc\u306b\u3082\u300c\u30aa\u30fc\u30d0\u30fc\u30b5\u30a4\u30f3\u300d\u3059\u308b\u3002\u53ef\u80fd\u3067\u3042\u308c\u3070\u3001\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u30d8\u30c3\u30c0\u306b\u3082\u300c\u904e\u5270\u7f72\u540d\u300d\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u5f8c\u306e\u5909\u66f4\u306b\u6c17\u3065\u304b\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u5207\u308a\u6368\u3066\u30a8\u30e9\u30fc\u3092\u907f\u3051\u308b\u305f\u3081\u3001\u9577\u3044\u516c\u958b\u9375\u306fTXT\u30ec\u30b3\u30fc\u30c9\u5185\u3067255\u6587\u5b57\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u6b63\u3057\u304f\u5206\u5272\u3057\u3066\u3044\u308b\u3002\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u5c0e\u5165\u3057\u3001\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30b7\u30b9\u30c6\u30e0\u3092\u5207\u308a\u66ff\u3048\u3001\u5b9a\u3081\u3089\u308c\u305f\u7336\u4e88\u671f\u9593\u306e\u5f8c\u306b\u53e4\u3044\u30bb\u30ec\u30af\u30bf\u3092\u524a\u9664\u3059\u308b\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u500b\u3005\u306e\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u66f4\u65b0\u304c\u9045\u308c\u3066\u3082\u3001\u914d\u4fe1\u306f\u5b89\u5b9a\u3057\u3066\u3044\u308b\u3002Ed25519\u306f\u3001\u5b9f\u969b\u306b\u306f\u307e\u3060\u3069\u3053\u3067\u3082\u53d7\u3051\u5165\u308c\u3089\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30dc\u30c7\u30a3\u3092\u5909\u66f4\u3059\u308b\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\uff08\u4f8b\u3048\u3070\u514d\u8cac\u4e8b\u9805\uff09\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u306eDKIM \u201cl=\u201d\uff08\u30dc\u30c7\u30a3\u306e\u9577\u3055\uff09\u3092\u907f\u3051\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>DMARC\uff1a\u30dd\u30ea\u30b7\u30fc\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3001\u30ec\u30dd\u30fc\u30c8<\/h2>\n\n<p>DMARC\u306f\u3001SPF\u3068DKIM\u3092\u660e\u78ba\u306a\u5f62\u3067\u30ea\u30f3\u30af\u3057\u3066\u3044\u308b\u3002 <strong>\u65b9\u91dd<\/strong> \u3067\u3001\u898b\u3048\u308bfrom-domain\u304c\u5c11\u306a\u304f\u3068\u30821\u3064\u306e\u30c1\u30a7\u30c3\u30af\u30b7\u30b0\u30ca\u30eb\u3068\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u79c1\u306f\u300cp=none\u300d\u304b\u3089\u59cb\u3081\u3066\u3001\u8ab0\u304c\u30c9\u30e1\u30a4\u30f3\u306e\u4ee3\u7406\u3068\u3057\u3066\u9001\u4fe1\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u96c6\u7d04\u30ec\u30dd\u30fc\u30c8\uff08rua\uff09\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u3059\u3079\u3066\u306e\u6b63\u5f53\u306a\u9001\u4fe1\u5143\u304c\u30af\u30ea\u30fc\u30f3\u306a\u72b6\u614b\u306b\u306a\u3063\u305f\u3089\u3001\u3059\u3050\u306b\u300c\u9694\u96e2\u300d\u306b\u5207\u308a\u66ff\u3048\u3001\u305d\u306e\u5f8c\u300c\u62d2\u5426\u300d\u306b\u5207\u308a\u66ff\u3048\u308b\u3002\u3053\u306e\u6bb5\u968e\u7684\u30e2\u30c7\u30eb\u306f\u3001\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u30d5\u30ed\u30fc\u306b\u5bfe\u3059\u308b\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3057\u3001\u5f90\u3005\u306b\u9632\u5fa1\u3092\u5f37\u5316\u3059\u308b\u3082\u306e\u3067\u3042\u308b\u3002\u3055\u3089\u306b\u3001\u79c1\u306f\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30fb\u30e2\u30fc\u30c9\uff08relax\/strict\uff09\u3092\u89b3\u5bdf\u3057\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3002 <strong>\u30c9\u30e1\u30a4\u30f3<\/strong> \u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u304c\u95a2\u4e0e\u3057\u3066\u3044\u3066\u3082\u3001\u4e00\u8cab\u3057\u3066\u6a5f\u80fd\u3059\u308b\u3002.<\/p>\n\n<h2>DMARC\u306e\u8a73\u7d30\uff1a\u30bf\u30b0\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3001\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u306e\u65bd\u884c<\/h2>\n\n<p>p\u3001rua\u3001adkim\u3001aspf\u306b\u52a0\u3048\u3066\u3001\u79c1\u306f\u7279\u306b\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b \u201csp=\u201d\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\uff1a\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u304c\u751f\u7523\u7684\u306b\u9001\u4fe1\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u304c\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u3001\u79c1\u306f\u672a\u4f7f\u7528\u306e\u30b9\u30da\u30fc\u30b9\u3092\u9589\u3058\u308b\u305f\u3081\u306b \u201csp=reject \u201d\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002pct=\u201c\u3092\u4f7f\u3048\u3070\u3001100 %\u306b\u3059\u308b\u524d\u306b\u3001\u6bd4\u4f8b\u7684\u306b\uff08\u305f\u3068\u3048\u307050 %\uff09\u5b9f\u65bd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u300cri=\u201d\u306f\u5831\u544a\u983b\u5ea6\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3002\u30d5\u30a9\u30ec\u30f3\u30b8\u30c3\u30af\u30ec\u30dd\u30fc\u30c8\uff08ruf\/fo\uff09\u306f\u3001\u30c7\u30fc\u30bf\u4fdd\u8b77\u3068\u9650\u5b9a\u7684\u306a\u30b5\u30dd\u30fc\u30c8\u306e\u89b3\u70b9\u304b\u3089\u8a55\u4fa1\u3059\u308b\u3002\u304d\u308c\u3044\u306a\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u306e\u9001\u4fe1\u8005\uff08\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\uff09\u304c\u30c9\u30e1\u30a4\u30f3\u30d5\u30a1\u30df\u30ea\u30fc\u3068\u4e00\u81f4\u3059\u308b\u3053\u3068\u3001\u307e\u305f\u306fDKIM\u304c\u4e00\u8cab\u3057\u3066\u76ee\u306b\u898b\u3048\u308bfrom-domain\u306b\u7f72\u540d\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\u8907\u6570\u306e\u30c4\u30fc\u30eb\u304c\u6df7\u5728\u3059\u308b\u74b0\u5883\u3067\u306f\u3001\u6700\u521d\u306faspf\/adkim\u3092relaxed\u306b\u8a2d\u5b9a\u3057\u3001\u3059\u3079\u3066\u306e\u30d1\u30b9\u304c\u30c9\u30e1\u30a4\u30f3\u30d5\u30a1\u30df\u30ea\u30fc\u306e\u4e0b\u3067\u4e00\u8cab\u3057\u3066\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3089\u3059\u3050\u306bstrict\u306b\u53b3\u683c\u5316\u3059\u308b\u3002.<\/p>\n\n<h2>DNS\u30ec\u30b3\u30fc\u30c9\uff1a\u69cb\u6587\u3001TTL\u3001\u4f8b<\/h2>\n\n<p>DNS\u306e\u516c\u958b\u306f\u3001\u4ee5\u4e0b\u306e\u901f\u5ea6\u3068\u4fe1\u983c\u6027\u3092\u6c7a\u5b9a\u3059\u308b\u3002 <strong>\u5909\u66f4\u70b9<\/strong>. .SPF\u3067\u306f\u3001\u300cv=spf1 include:... -all\u300d\u3092\u4f7f\u3044\u3001\u4f59\u8a08\u306ainclude\u3092\u524a\u9664\u3057\u305f\u308a\u3001IP\u30d6\u30ed\u30c3\u30af\u3092\u76f4\u63a5\u8868\u8a18\u3057\u305f\u308a\u3057\u3066\u300110\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u5236\u9650\u306b\u6ce8\u610f\u3057\u3066\u3044\u308b\u3002DKIM\u30ec\u30b3\u30fc\u30c9\u306fselector._domainkey.example.tld\u306e\u4e0b\u306bTXT\u3068\u3057\u3066 \u201cv=DKIM1; k=rsa; p=... \u201d\u3067\u516c\u958b\u3057\u3066\u3044\u308b\u3002DMARC\u306f_dmarc.example.tld\u306e\u4e0b\u306b \u201cv=DMARC1; p=none; rua=mailto:...; adkim=r; aspf=r \u201d\u3068\u3057\u3066\u3042\u308a\u307e\u3059\u3002300-900\u79d2\u306e\u3088\u3046\u306a\u4f4e\u3044TTL\u306f\u30c6\u30b9\u30c8\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 <strong>\u30c8\u30e9\u30d5\u30a3\u30c3\u30af<\/strong> \u305d\u3057\u3066\u3001\u3088\u308a\u5b89\u5b9a\u3057\u305f\u30ad\u30e3\u30c3\u30b7\u30e5\u3002.<\/p>\n\n<h2>DNS\u30ac\u30d0\u30ca\u30f3\u30b9\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/h2>\n\n<p>\u751f\u7523\u7684\u306a\u30be\u30fc\u30f3\u3067\u306f\u3001\u4e00\u8cab\u3057\u305fTTL\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3092\u7dad\u6301\u3059\u308b\u3002\u79fb\u52d5\u53ef\u80fd\u306a\u30a8\u30f3\u30c8\u30ea\uff08SPF\u3001DKIM\u30bb\u30ec\u30af\u30bf\uff09\u306b\u306f\u77ed\u304f\u3001\u5b89\u5b9a\u3057\u305f\u30a8\u30f3\u30c8\u30ea\uff08NS\u3001SOA\uff09\u306b\u306f\u9577\u304f\u3059\u308b\u3002DKIM\u30ad\u30fc\u306f\u5e38\u306bTXT\u3068\u3057\u3066\u516c\u958b\u3059\u308b\u3002\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u304c\u660e\u793a\u7684\u306b\u63d0\u4f9b\u3057\u3066\u3044\u308b\u5834\u5408\u306e\u307f\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30db\u30b9\u30c8\u3078\u306eCNAME\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3092\u8a2d\u5b9a\u3059\u308b\u3002TXT\u5024\u304c\u6b63\u3057\u304f\u9006\u30ab\u30f3\u30de\u3067\u5206\u5272\u3055\u308c\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u304c\u30b5\u30a4\u30ec\u30f3\u30c8\u30d6\u30ec\u30fc\u30af\u3092\u633f\u5165\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002DNSSEC\u3092\u4f7f\u7528\u3057\u3066\u3001\u30be\u30fc\u30f3\u3092\u64cd\u4f5c\u304b\u3089\u4fdd\u8b77\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u8907\u6570\u306e\u30c1\u30fc\u30e0\u3084\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u5909\u66f4\u3092\u52a0\u3048\u308b\u5834\u5408\u306b\u7279\u306b\u6709\u52b9\u3067\u3059\u3002\u30de\u30eb\u30c1DNS\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u306f\u3001\u30ec\u30b3\u30fc\u30c9\uff08\u30e9\u30f3\u30d6\u30c3\u30af\uff09\u3054\u3068\u306b\u6240\u6709\u6a29\u3092\u56fa\u5b9a\u3057\u3001\u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e89\u3044\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u306b\u3057\u3001\u5f79\u5272\u5206\u62c5\u3092\u660e\u78ba\u306b\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u914d\u4fe1\u53ef\u80fd\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30a8\u30e9\u30fc\u3092\u8fc5\u901f\u306b\u4fee\u6b63<\/h2>\n\n<p>\u5404\u5909\u66f4\u306e\u5f8c\u3001\u79c1\u306fSPF\u3001DKIM\u3001DMARC\u3092\u72ec\u7acb\u3057\u305f\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3068\u30d8\u30c3\u30c0\u30fc\u5206\u6790\u3067\u30c6\u30b9\u30c8\u3057\u3001\u6700\u5927\u9650\u306e\u52b9\u679c\u3092\u5f97\u307e\u3059\u3002 <strong>\u900f\u660e\u6027<\/strong>. .\u5178\u578b\u7684\u306a\u30a8\u30e9\u30fc\u306f\u3059\u3050\u306b\u308f\u304b\u308b\u3002\u30bb\u30ec\u30af\u30bf\u540d\u306e\u8aa4\u308a\u3001DKIM\u30ad\u30fc\u306e\u5207\u308a\u6368\u3066\u3001SPF\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u5236\u9650\u3001\u201c-all \u201d\u306e\u6b20\u843d\u306a\u3069\u3060\u3002\u7a7a\u306e\u30ec\u30dd\u30fc\u30c8\u306f\u3001\u3057\u3070\u3057\u3070\u30eb\u30a2\u30a2\u30c9\u30ec\u30b9\u306e\u30bf\u30a4\u30d7\u30df\u30b9\u3092\u793a\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3059\u3050\u306b\u4fee\u6b63\u3059\u308b\u3002\u6b63\u5f53\u306a\u9001\u4fe1\u5143\u304c\u5931\u6557\u3057\u3066\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u306f\u3001\u5225\u306e\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u304c\u30e1\u30fc\u30eb\u3092\u8ee2\u9001\u3057\u3066SPF\u3092\u7834\u58ca\u3057\u3066\u3044\u306a\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30d1\u30b9\u306b\u3064\u3044\u3066\u306f\u3001\u7ba1\u7406\u3055\u308c\u305f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u30d7\u30e9\u30f3\u3092\u7dad\u6301\u3059\u308b\u3002 <strong>\u53d7\u4fe1\u30c8\u30ec\u30a4<\/strong> \u82e6\u3057\u3093\u3067\u3044\u306a\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\/03\/email-authentication-hosting-setup-7894.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u8ee2\u9001\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001ARC<\/h2>\n\n<p>\u30d5\u30a9\u30ef\u30fc\u30c0\u30fc\u3084\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306f\u3001\u3057\u3070\u3057\u3070\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u306e\u5dee\u51fa\u4eba\u3084\u30d8\u30c3\u30c0\u30fc\u3001\u672c\u6587\u3092\u5909\u66f4\u3057\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u8ee2\u9001\u5148\u30db\u30b9\u30c8\u304c\u30dd\u30ea\u30b7\u30fc\u306b\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001SPF\u306f\u5b9a\u671f\u7684\u306b\u5931\u6557\u3057\u307e\u3059\u3002\u79c1\u306f\u4e00\u8cab\u6027\u306e\u3042\u308bDKIM\u7f72\u540d\u3067\u3053\u308c\u3092\u8efd\u6e1b\u3057\u3001SPF\u304c\u751f\u304d\u6b8b\u308b\u3088\u3046\u306b\u30d5\u30a9\u30ef\u30fc\u30c0\u30fc\u306bSRS\u3092\u63a8\u5968\u3057\u3066\u3044\u308b\u3002\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306f\u901a\u5e38\u3001\u4ef6\u540d\u306b\u63a5\u982d\u8f9e\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3001\u30d5\u30c3\u30bf\u30fc\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u305f\u308a\u3057\u307e\u3059\u3002ARC\uff08Authenticated Received Chain\uff09\u306f\u4fe1\u983c\u306e\u9023\u9396\u3092\u6587\u66f8\u5316\u3059\u308b\u306e\u3067\u3001\u3053\u3053\u3067\u5f79\u7acb\u3061\u307e\u3059\u3002\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u304cARC\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u79c1\u306f\u691c\u8a3c\u3092\u6709\u52b9\u306b\u3057\u3066\u3001\u6b63\u5f53\u3060\u304c\u5909\u66f4\u3055\u308c\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u4e0d\u5fc5\u8981\u306b\u8a55\u4fa1\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u30ea\u30b9\u30c8\u3092\u983b\u7e41\u306b\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001DMARC\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u7de9\u548c\u3059\u308b\u3053\u3068\u304b\u3089\u59cb\u3081\u3001\u3059\u3079\u3066\u306e\u30d1\u30b9\u304c\u691c\u8a3c\u3055\u308c\u3066\u304b\u3089\u30dd\u30ea\u30b7\u30fc\u3092\u9069\u7528\u3059\u308b\u3002.<\/p>\n\n<h2>\u6bd4\u8f03\u3068\u9069\u7528\u30b7\u30ca\u30ea\u30aa<\/h2>\n\n<p>\u65e5\u5e38\u751f\u6d3b\u3067\u306f\u3001\u3053\u306e3\u3064\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u983c\u3063\u3066\u3044\u308b\u3002 <strong>\u30d7\u30ed\u30c8\u30b3\u30eb<\/strong>, \u3068\u3044\u3046\u306e\u3082\u3001\u5404\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u30bf\u30a4\u30d7\u306e\u6b3a\u779e\u306b\u5bfe\u51e6\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3042\u308b\u3002SPF\u306f\u9001\u4fe1\u30db\u30b9\u30c8\u3092\u7279\u5b9a\u3057\u3001DKIM\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4fdd\u8b77\u3057\u3001DMARC\u306f\u5236\u5fa1\u3068\u53ef\u8996\u6027\u3092\u63d0\u4f9b\u3059\u308b\u3002\u4e00\u65b9\u304c\u7a81\u7136\u5931\u6557\u3057\u3066\u3082\u3001\u3082\u3046\u4e00\u65b9\u304c\u8a8d\u8a3c\u3092\u7d99\u7d9a\u3057\u3001\u914d\u4fe1\u3092\u5b89\u5b9a\u3055\u305b\u308b\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u306f\u5197\u9577\u6027\u3092\u8a08\u753b\u3057\u3066\u3044\u308b\u3002\u6709\u52b9\u306aDKIM\u7f72\u540d\u3068\u660e\u78ba\u306a\u30dd\u30ea\u30b7\u30fc\u306eSPF\u3092\u6301\u3064\u8907\u6570\u306e\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30fb\u30d1\u30b9\u3060\u3002\u6b21\u306e\u8868\u306f\u3001\u9069\u5207\u306a\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u3088\u308a\u8fc5\u901f\u306b\u898b\u3064\u3051\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3068\u5178\u578b\u7684\u306a\u5c0e\u5165\u6848\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3059\u3002 <strong>\u6226\u7565<\/strong> \u3092\u9078\u3076\u3002<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30d7\u30ed\u30c8\u30b3\u30eb<\/th>\n      <th>\u76ee\u7684<\/th>\n      <th>\u5f37\u307f<\/th>\n      <th>\u30d0\u30a6\u30f3\u30c0\u30ea\u30fc<\/th>\n      <th>DNS\u306e\u4f8b<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td><strong>SPF<\/strong><\/td>\n      <td>\u8a8d\u53ef\u3055\u308c\u305f\u51fa\u8377\u5143\u3092\u5b9a\u7fa9\u3059\u308b<\/td>\n      <td>\u660e\u78ba\u306a\u30db\u30b9\u30c8\u8a8d\u8a3c\u3001\u7c21\u5358\u306a\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9<\/td>\n      <td>\u30d5\u30a9\u30ef\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u4e2d\u65ad\u300110\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u5236\u9650<\/td>\n      <td>v=spf1 include:_spf.example.com -all<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong><\/td>\n      <td>\u30b3\u30f3\u30c6\u30f3\u30c4\u3068\u9001\u4fe1\u8005\u306e\u5b8c\u5168\u6027<\/td>\n      <td>\u9078\u629e\u53ef\u80fd<\/td>\n      <td>\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u7d4c\u7531\u306e\u5909\u66f4\u306f\u7f72\u540d\u3092\u5371\u967a\u306b\u3055\u3089\u3059<\/td>\n      <td>v=DKIM1; k=rsa; p=BASE64KEY<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\uff24\uff2d\uff21\uff32\uff23<\/strong><\/td>\n      <td>\u65b9\u91dd\u3001\u8abf\u6574\u3001\u5831\u544a<\/td>\n      <td>\u30ec\u30b7\u30fc\u30d0\u30fc\u306e\u53cd\u5fdc\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3002<\/td>\n      <td>\u6a5f\u80fd\u3059\u308bSPF\/DKIM\u304c\u5fc5\u8981<\/td>\n      <td>v=DMARC1; p=quarantine; rua=mailto:rua@tld<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u5f79\u5272\u3001\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3001\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u8a2d\u8a08<\/h2>\n\n<p>\u79c1\u306f\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3068\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u30e1\u30fc\u30eb\u3092\u5206\u3051\u3066\u3044\u307e\u3059\uff08\u4f8b\uff1amail.example.tld\u3068news.example.tld\uff09\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u5206\u6790\u304c\u30af\u30ea\u30fc\u30f3\u306b\u4fdd\u305f\u308c\u3001\u79c1\u306f\u5dee\u5225\u5316\u3055\u308c\u305f\u30dd\u30ea\u30b7\u30fc\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\uff08\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u9001\u4fe1\u8005\uff09\u306f\u3001SPF\u3092\u6e80\u305f\u3057\u3001\u30d0\u30a6\u30f3\u30b9\u3092\u78ba\u5b9f\u306b\u51e6\u7406\u3059\u308b\u3001\u7ba1\u7406\u3055\u308c\u305f\u5225\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002\u76ee\u306b\u898b\u3048\u308b\u5dee\u51fa\u4eba\u30c9\u30e1\u30a4\u30f3\uff085322.From\uff09\u3001DKIM-d=\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u30c9\u30e1\u30a4\u30f3\u304c\u30d5\u30a1\u30df\u30ea\u30fc\u5074\u3067\u4e00\u81f4\u3059\u308c\u3070\u3001DMARC\u306e\u6574\u5408\u306f\u5b89\u5b9a\u3059\u308b\u3002\u79c1\u306f\u300cNo-Reply\u300d\u3092\u907f\u3051\u3066\u3044\u307e\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u5fdc\u7b54\u80fd\u529b\u304c\u306a\u3044\u3068\u30d5\u30a3\u30eb\u30bf\u30fc\u304b\u3089\u5426\u5b9a\u7684\u306a\u6ce8\u76ee\u3092\u96c6\u3081\u3001\u30b5\u30dd\u30fc\u30c8\u30d5\u30ed\u30fc\u304c\u96e3\u3057\u304f\u306a\u308b\u304b\u3089\u3067\u3059\u3002\u305d\u306e\u4ee3\u308f\u308a\u306b\u3001\u660e\u78ba\u306a\u5f79\u5272\u3092\u6301\u3064\u5c02\u7528\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u3001\u7ba1\u7406\u3055\u308c\u305f\u65b9\u6cd5\u3067\u8fd4\u4fe1\u3092\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d1\u30cd\u30eb\u3068\u30ef\u30fc\u30af\u30d5\u30ed\u30fcPlesk\u3001cPanel\u3001\u30af\u30e9\u30a6\u30c9<\/h2>\n\n<p>Plesk\u3068cPanel\u3067\u306f\u3001\u30d1\u30cd\u30eb\u3067\u76f4\u63a5DKIM\u3092\u6709\u52b9\u306b\u3057\u3001\u5fc5\u8981\u3067\u3042\u308c\u3070\u72ec\u81ea\u306e\u30ad\u30fc\u3092\u30ed\u30fc\u30c9\u3057\u3066\u3001\u6b21\u306e\u3088\u3046\u306b\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002 <strong>\u30bb\u30ec\u30af\u30bf\u30fc<\/strong> \u3092DNS\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002\u591a\u304f\u306e\u30af\u30e9\u30a6\u30c9\u30e1\u30fc\u30e9\u30fc\u306f\u65e2\u88fd\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u516c\u958b\u3057\u3066\u3044\u308b\u3002\u79c1\u306f\u305d\u308c\u3092\u6b63\u78ba\u306b\u8ee2\u9001\u3057\u3001\u77ed\u3044TTL\u3067\u30c6\u30b9\u30c8\u3059\u308b\u3002\u8907\u6570\u306e\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u30bb\u30ec\u30af\u30bf\u30fc\u3054\u3068\u306b\u9001\u4fe1\u30c1\u30e3\u30f3\u30cd\u30eb\u3092\u5206\u3051\u3001\u5206\u6790\u3092\u660e\u78ba\u306b\u3057\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6574\u7136\u3068\u884c\u3046\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u307e\u305f\u3001\u30d1\u30cd\u30eb\u3054\u3068\u306b\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3092\u7528\u610f\u3057\u3001\u5fc5\u8981\u306a\u624b\u9806\u3092\u3059\u3079\u3066\u6b63\u3057\u3044\u9806\u5e8f\u3067\u8a18\u8f09\u3057\u3066\u3044\u307e\u3059\u3002Plesk\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u4eba\u306a\u3089\u8ab0\u3067\u3082\u3001\u3053\u306e\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u30ac\u30a4\u30c9\u3067\u5fae\u8abf\u6574\u306b\u5f79\u7acb\u3064\u624b\u9806\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3067\u3057\u3087\u3046\uff1a <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>.<\/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\/03\/email_authentication_techoffice_1943.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u81ea\u52d5\u5316\u3068\u30d0\u30fc\u30b8\u30e7\u30cb\u30f3\u30b0<\/h2>\n\n<p>\u518d\u73fe\u53ef\u80fd\u306a\u54c1\u8cea\u306e\u305f\u3081\u306b\u3001\u79c1\u306fSPF\u3001DKIM\u30bb\u30ec\u30af\u30bf\u3001DMARC\u306b\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002DNS\u306e\u5909\u66f4\u306f\u3001\u30c1\u30b1\u30c3\u30c8\u3001\u65e5\u4ed8\u3001\u7406\u7531\u3001\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u30d1\u30b9\u3092\u542b\u3080\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3055\u308c\u305f\u5f62\u5f0f\u3067\u6587\u66f8\u5316\u3057\u307e\u3059\u3002\u672c\u756a\u7a3c\u52d5\u524d\u306b\u3001\u77ed\u3044TTL\u3067\u30b9\u30c6\u30fc\u30b8\u30f3\u30b0\u30be\u30fc\u30f3\u3092\u5b9f\u884c\u3057\u3001\u69cb\u6587\uff08\u30c0\u30d6\u30eb\u30bb\u30df\u30b3\u30ed\u30f3\u3001\u5f15\u7528\u7b26\u306e\u6b20\u843d\u306a\u3069\uff09\u3092\u81ea\u52d5\u7684\u306b\u691c\u8a3c\u3057\u307e\u3059\u3002\u5909\u66f4\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u8a08\u753b\u3057\u3001\u53d7\u4fe1\u78ba\u8a8d\u30e1\u30fc\u30eb\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u7a4d\u6975\u7684\u306b\u76e3\u8996\u3057\u3066\u3001\u9038\u8131\u304c\u3042\u308c\u3070\u3059\u3050\u306b\u6c17\u3065\u304f\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u7d71\u5408\u3055\u308c\u305f\u308a\u5909\u66f4\u3055\u308c\u305f\u308a\u3057\u305f\u5834\u5408\u306f\u3001\u6a19\u6e96\u5316\u3055\u308c\u305f\u65b9\u6cd5\u3067\u3053\u308c\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\uff1aSPF\u306e\u66f4\u65b0\u3001DKIM\u30bb\u30ec\u30af\u30bf\u306e\u4f5c\u6210\u3001\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3001DMARC\u306e\u76e3\u8996\u3001\u30ea\u30ea\u30fc\u30b9-\u5e38\u306b\u540c\u3058\u9806\u5e8f\u3067\u3002.<\/p>\n\n<h2>DMARC\u30ec\u30dd\u30fc\u30c8\u306e\u95b2\u89a7\u3068\u5bfe\u5fdc<\/h2>\n\n<p>\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u3067\u306f\u3001\u3069\u306e\u30db\u30b9\u30c8\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u653e\u9001\u3057\u3066\u3044\u308b\u304b\u3092\u8868\u793a\u3057\u307e\u3059\u3002 <strong>\u8650\u5f85<\/strong> \u3092\u4f7f\u3063\u3066\u963b\u6b62\u3057\u3066\u3044\u308b\u3002\u4e0d\u660e\u306aIP\u304c\u73fe\u308c\u305f\u3089\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3067\u30d6\u30ed\u30c3\u30af\u3059\u308b\u304b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u304b\u3089\u6b20\u9665\u306e\u3042\u308b\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3092\u524a\u9664\u3059\u308b\u3002\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u5b9a\u671f\u7684\u306b\u5931\u6557\u3059\u308b\u5834\u5408\u306f\u3001DMARC\u304c\u8a31\u53ef\u3092\u51fa\u3059\u307e\u3067\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3084\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u3092\u8abf\u6574\u3059\u308b\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u5206\u6790\u306b\u3064\u3044\u3066\u306f\u3001\u30bd\u30fc\u30b9\u5225\u3001\u7d50\u679c\u5225\u3001\u91cf\u5225\u306b\u30ec\u30dd\u30fc\u30c8\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3001\u771f\u306e\u30ea\u30b9\u30af\u304c\u6700\u521d\u306b\u6765\u308b\u3088\u3046\u306b\u3059\u308b\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u5206\u6790\u306b\u95a2\u3059\u308b\u5b9f\u8df5\u7684\u306a\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3\u3092\u63d0\u4f9b\u3059\u308b\uff1a <a href=\"https:\/\/webhosting.de\/ja\/dmarc%e3%81%8c%e3%82%bb%e3%82%ad%e3%83%a5%e3%82%a2%e3%83%8d%e3%83%83%e3%83%88%e3%81%ae%e3%82%b9%e3%83%97%e3%83%bc%e3%83%95%e3%82%a3%e3%83%b3%e3%82%b0%e3%82%92%e5%a0%b1%e5%91%8a\/\">DMARC\u30ec\u30dd\u30fc\u30c8\u306e\u8a55\u4fa1<\/a>.<\/p>\n\n<h2>\u30ec\u30dd\u30fc\u30c8\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u5206\u6790<\/h2>\n\n<p>DMARC\u30a2\u30b0\u30ea\u30b2\u30fc\u30c8\u306fXML\u5f62\u5f0f\u3067\u5727\u7e2e\uff08zip\/gzip\uff09\u3055\u308c\u3066\u3044\u308b\u3002\u79c1\u306f\u307e\u305a\u3001\u4e0a\u4f4d\u306e\u9001\u4fe1\u8005\u3001\u305d\u306e\u30d1\u30b9\uff0f\u30d5\u30a7\u30a4\u30eb\u306e\u6bd4\u7387\u3001SPF\u307e\u305f\u306fDKIM\u304c\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u30d1\u30bf\u30fc\u30f3\u304c\u73fe\u308c\u308b\u307e\u3067\u3001\u91cf\u306e\u5c11\u306a\u3044\u5b9a\u671f\u7684\u306a\u7570\u5e38\u5024\u3092\u4fdd\u5b58\u3057\u3066\u304a\u304d\u3001\u91cf\u306e\u591a\u3044\u7570\u5e38\u5024\u3092\u512a\u5148\u3059\u308b\u3002\u30eb\u30a2\u30bf\u30b0\u306b\u8907\u6570\u306e\u53d7\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30c1\u30fc\u30e0\uff08\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306a\u3069\uff09\u306b\u4e26\u884c\u3057\u3066\u4f9b\u7d66\u3057\u3001\u8aa4\u8a2d\u5b9a\u3092\u8fc5\u901f\u306b\u5272\u308a\u5f53\u3066\u308b\u305f\u3081\u306b\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3054\u3068\u306b\u30c7\u30fc\u30bf\u3092\u6b63\u898f\u5316\u3059\u308b\u3002\u9855\u8457\u306a\u30d4\u30fc\u30af\u306f\u3001\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u306e\u958b\u59cb\u3001\u65b0\u3057\u3044\u30c4\u30fc\u30eb\u3001\u307e\u305f\u306f\u4e0d\u6b63\u4f7f\u7528\u3092\u793a\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u3059\u3050\u306b\u5bfe\u7b56\uff08SPF\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3001\u30bb\u30ec\u30af\u30bf\u306e\u4fee\u6b63\u3001\u30dd\u30ea\u30b7\u30fc\u306e\u5f37\u5316\uff09\u3092\u8b1b\u3058\u308b\u3002.<\/p>\n\n<h2>\u30e1\u30fc\u30eb\u5468\u308a\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316<\/h2>\n\n<p>\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306f\u3001MFA\u3001\u9577\u3044\u30d1\u30b9\u30d5\u30ec\u30fc\u30ba\u3001\u7b49\u7d1a\u5206\u3051\u3055\u308c\u305f\u30ed\u30b0\u30a4\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u3055\u3089\u306b\u3046\u307e\u304f\u3044\u304d\u307e\u3059\u3002 <strong>\u6599\u91d1\u5236\u9650<\/strong> 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<strong>\u8a55\u5224<\/strong> \u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\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\/03\/email_auth_setup_desk_8392.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>BIMI\u3068\u30d6\u30e9\u30f3\u30c9\u4fdd\u8b77<\/h2>\n\n<p>\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30ed\u30b4\u3092\u8868\u793a\u3057\u305f\u3044\u5834\u5408\u306f\u3001BIMI\u3092\u6e96\u5099\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u524d\u63d0\u6761\u4ef6\u306f\u3001\u5b89\u5b9a\u3057\u305f\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3067DMARC\u30dd\u30ea\u30b7\u30fc\uff08\u9694\u96e2\u307e\u305f\u306f\u62d2\u5426\uff09\u3092\u5f37\u5236\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u79c1\u306f\u304d\u308c\u3044\u306aSVG\u30ed\u30b4\u3092\u4fdd\u5b58\u3057\u3001\u3059\u3079\u3066\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u4e00\u8cab\u3057\u305f\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u3088\u3063\u3066\u306f\u3001\u691c\u8a3c\u6e08\u307f\u30d6\u30e9\u30f3\u30c9\u691c\u8a3c\uff08VMC\uff09\u304c\u5fc5\u8981\u306a\u5834\u5408\u3082\u3042\u308b\u3002BIMI\u306f\u76f4\u63a5\u7684\u306b\u914d\u4fe1\u3092\u6539\u5584\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u3044\u304c\u3001\u4fe1\u983c\u3001\u8a8d\u77e5\u3001\u30af\u30ea\u30c3\u30af\u3059\u308b\u610f\u6b32\u3092\u9ad8\u3081\u3001\u540c\u6642\u306b\u64cd\u4f5c\u3092\u3088\u308a\u660e\u767d\u306b\u3059\u308b\u3002BIMI\u3092\u5c0e\u5165\u3059\u308b\u306e\u306f\u3001SPF\u3001DKIM\u3001DMARC\u304c\u4f55\u9031\u9593\u3082\u30b9\u30e0\u30fc\u30ba\u306b\u52d5\u4f5c\u3057\u3001\u30ec\u30dd\u30fc\u30c8\u306b\u7570\u5e38\u304c\u898b\u3089\u308c\u306a\u304f\u306a\u3063\u3066\u304b\u3089\u306b\u3057\u3088\u3046\u3068\u8003\u3048\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u983b\u7e41\u306a\u30a8\u30e9\u30fc\u3068\u8fc5\u901f\u306a\u30c1\u30a7\u30c3\u30af<\/h2>\n\n<p>\u591a\u304f\u306eSPF\u30ec\u30b3\u30fc\u30c9\u306f\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u304c\u591a\u3059\u304e\u3066\u306f\u3058\u304b\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u79c1\u306f\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u7d71\u5408\u3057\u3001\u76f4\u63a5\u306e 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<strong>\u4fdd\u8b77<\/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\/03\/emailauthentifizierung-5501.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u6301\u3061\u53bb\u308b<\/h2>\n\n<p>\u30af\u30ea\u30fc\u30f3 <strong>spf dkim dmarc \u30db\u30b9\u30c6\u30a3\u30f3\u30b0<\/strong> 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