{"id":12696,"date":"2025-09-21T13:20:29","date_gmt":"2025-09-21T11:20:29","guid":{"rendered":"https:\/\/webhosting.de\/email-eigene-domain-mx-records-tools-einrichten-anleitung-hosting\/"},"modified":"2025-09-21T13:20:29","modified_gmt":"2025-09-21T11:20:29","slug":"%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e7%8b%ac%e8%87%aa%e3%81%ae%e3%83%89%e3%83%a1%e3%82%a4%e3%83%b3mx%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%89%e3%83%84%e3%83%bc%e3%83%ab%e3%81%ae%e3%82%bb%e3%83%83","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/email-eigene-domain-mx-records-tools-einrichten-anleitung-hosting\/","title":{"rendered":"\u72ec\u81ea\u30c9\u30e1\u30a4\u30f3\u3067\u30e1\u30fc\u30eb\u8a2d\u5b9a\uff1aMX\u30ec\u30b3\u30fc\u30c9\u3068\u30c4\u30fc\u30eb\u306e\u8aac\u660e"},"content":{"rendered":"<p><strong>MX\u30ec\u30b3\u30fc\u30c9<\/strong> 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<strong>\u512a\u5148\u9806\u4f4d<\/strong>\u306a\u305c\u306a\u3089\u3001\u3053\u308c\u306f\u914d\u9054\u3092\u6df7\u4e71\u3055\u305b\u308b\u304b\u3089\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\/2025\/09\/email-domain-tools-mx-records-4871.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>MX\u30ec\u30b3\u30fc\u30c9\u306b\u95a2\u3059\u308b\u91cd\u8981\u306aDNS\u30eb\u30fc\u30eb<\/h2>\n\n<p>\u79c1\u306f\u3044\u304f\u3064\u304b\u306e\u3053\u3068\u3092\u6307\u6458\u3059\u308b\u3002 <strong>\u57fa\u672c\u30eb\u30fc\u30eb<\/strong>\u79c1\u306eMX\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u6280\u8853\u7684\u306b\u30af\u30ea\u30fc\u30f3\u3067\u3042\u308b\u3088\u3046\u306b\uff1a<\/p>\n<ul>\n  <li><strong>MX\u306f\u30db\u30b9\u30c8\u540d\u3092\u6307\u3059<\/strong>IP\u30a2\u30c9\u30ec\u30b9\u306b\u5bfe\u3057\u3066\u3067\u306f\u306a\u3044\u3002\u30bf\u30fc\u30b2\u30c3\u30c8\u30db\u30b9\u30c8\u306b\u306f\u6709\u52b9\u306aA\u30ec\u30b3\u30fc\u30c9\u307e\u305f\u306fAAAA\u30ec\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n  <li><strong>MX\u5b9b\u5148\u306bCNAME\u304c\u306a\u3044\uff1a<\/strong> MX\u306fCNAME\u3092\u53c2\u7167\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3002\u79c1\u306f\u5e38\u306bcanonical host\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n  <li><strong>\u540c\u3058\u30aa\u30fc\u30ca\u30fc\u306bCNAME\u304c\u306a\u3044<\/strong>CNAME\u304c\u3042\u308b\u5834\u5408\u3001\u4ed6\u306e\u30ec\u30b3\u30fc\u30c9\u30bf\u30a4\u30d7\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001MX\u3001TXT (SPF)\u307e\u305f\u306f\u4ed6\u306e\u30a8\u30f3\u30c8\u30ea\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30eb\u30fc\u30c8\u30c9\u30e1\u30a4\u30f3\u306bCNAME\u3092\u8a2d\u5b9a\u3057\u307e\u305b\u3093\u3002<\/li>\n  <li><strong>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306f\u5225\u3005\u306b<\/strong>\u306b\u3064\u3044\u3066 <em>sub.example.de<\/em> \u306e\u5834\u5408\u3001\u81ea\u52d5\u7684\u306b\u30eb\u30fc\u30c8\u306eMX\u3067\u306f\u306a\u304f\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306eMX\u304c\u9069\u7528\u3055\u308c\u307e\u3059\u3002\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3059\u308b\u5834\u5408\u306f\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306bMX\u3092\u5165\u529b\u3057\u307e\u3059\u3002<\/li>\n  <li><strong>\u8ce2\u660e\u306a\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u9078\u629e<\/strong>\u8907\u6570\u306eMX\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u540c\u3058\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u306e\u3082\u306e\u3067\u3042\u308b\u304b\u3001\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u304c\u672c\u5f53\u306b\u6a5f\u80fd\u3059\u308b\u3088\u3046\u306b\u540c\u671f\u3055\u308c\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n\n<h2>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u5225MX\u306e\u4f8b<\/h2>\n\n<p>\u79c1\u306f\u3044\u3064\u3082\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u7ba1\u7406\u30a8\u30ea\u30a2\u304b\u3089\u306e\u60c5\u5831\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002\u5178\u578b\u7684\u306a\u4f8b\u306f\u3001\u79c1\u304c\u7406\u89e3\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\uff08\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\uff09\uff1a<\/p>\n<ul>\n  <li><strong>Google\u30ef\u30fc\u30af\u30b9\u30da\u30fc\u30b9<\/strong>\u6b21\u306e\u3088\u3046\u306a\u30db\u30b9\u30c8 <em>aspmx.l.google.com<\/em> (\u512a\u5148\u9806\u4f4d1\uff09\u3068\u305d\u306e\u4ed6\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7 <em>alt1.aspmx.l.google.com<\/em> \u305d\u306e\u4ed6\u79c1\u306f\u3059\u3079\u3066\u306e\u63a8\u5968\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u8a2d\u5b9a\u3057\u305f\u3002<\/li>\n  <li><strong>\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8365<\/strong>\u307b\u3068\u3093\u3069 <em>\u30c9\u30e1\u30a4\u30f3\u30ad\u30fc.mail.protection.outlook.com<\/em> (\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306b\u500b\u5225\u306b)\u512a\u5148\u5ea60\u307e\u305f\u306f10\u3067\u8a2d\u5b9a\u3059\u308b\u3002<\/li>\n  <li><strong>\u30d7\u30ed\u30c8\u30f3\u30fb\u30e1\u30fc\u30eb<\/strong>\u983b\u7e41\u306b <em>mail.protonmail.ch<\/em> (\u512a\u5148\u9806\u4f4d10\uff09\u3068 <em>mailsec.protonmail.ch<\/em> (\u512a\u5148\u9806\u4f4d20\uff09\u3002<\/li>\n  <li><strong>\u30a6\u30a7\u30d6\u30db\u30b9\u30c8<\/strong>\u591a\u304f\u306e\u5834\u5408\u3001\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3055\u308c\u305fMX\u306e\u3088\u3046\u306a\u3082\u306e\u3060\u3002 <em>mxX.provider.tld<\/em>.\u5bfe\u5fdc\u3059\u308bA\/AA\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u79c1\u306f\u4e00\u822c\u7684\u306a\u4f8b\u306b\u983c\u3089\u305a\u3001\u81ea\u5206\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u304b\u3089\u6b63\u78ba\u306a\u5024\u3092\u5165\u529b\u3059\u308b\u3002<\/p>\n\n<h2>SPF\u3001DKIM\u3001DMARC\u306e\u88dc\u8db3<\/h2>\n\n<p>MX\u306b\u52a0\u3048\u3066\u3001\u79c1\u306f\u3044\u3064\u3082 <strong>SPF<\/strong> \u8a8d\u8a3c\u3055\u308c\u305f\u30b5\u30fc\u30d0\u30fc\u3060\u3051\u304c\u79c1\u306e\u4ee3\u308f\u308a\u306b\u9001\u4fe1\u3059\u308b\u3088\u3046\u306b\u3002\u307e\u305f\u3001DKIM\u3092\u6709\u52b9\u306b\u3057\u3066\u3001\u3059\u3079\u3066\u306e\u9001\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u6697\u53f7\u7f72\u540d\u3092\u6301\u305f\u305b\u3066\u3044\u307e\u3059\u3002DMARC\u3092\u4f7f\u7528\u3057\u3066\u3001\u8a8d\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u30e1\u30fc\u30eb\u306b\u5bfe\u3057\u3066\u53d7\u4fe1\u8005\u304c\u4f55\u3092\u3059\u3079\u304d\u304b\u3068\u3044\u3046\u660e\u78ba\u306a\u30eb\u30fc\u30eb\u3092\u7b56\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308a\u3001\u914d\u4fe1\u7387\u304c\u5411\u4e0a\u3057\u3001\u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u7d4c\u7531\u306e\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u306e\u30ea\u30b9\u30af\u304c\u6e1b\u5c11\u3057\u307e\u3059\u3002\u79c1\u306f\u5b9a\u671f\u7684\u306b <strong>\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3<\/strong> \u7279\u306b\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u5909\u308f\u3063\u305f\u5f8c\u306f\u3002<\/p>\n\n<h2>SPF\/DKIM\/DMARC\u306e\u5b9f\u8df5\u3092\u6df1\u3081\u308b<\/h2>\n\n<p>SPF\u3067\u306f\u3001\u79c1\u306f\u7121\u99c4\u306e\u306a\u3044\u30dd\u30ea\u30b7\u30fc\u3092\u6301\u3063\u3066\u3044\u308b\u3002 <em>\u3092\u542b\u3080\uff1a<\/em>-DNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u6700\u5c0f\u5316\u3057\u3001\u91cd\u8907\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u907f\u3051\u308b\u305f\u3081\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3002\u5909\u66f4\u304c\u4fdd\u7559\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u79c1\u306f\u6700\u521d\u306b <strong>~\u3059\u3079\u3066<\/strong> (softfail)\u3057\u3001\u5f8c\u3067 <strong>-\u305c\u3093\u3076<\/strong> (hardfail)\u3059\u3079\u3066\u306e\u30c1\u30e3\u30f3\u30cd\u30eb\u304c\u9069\u5207\u306b\u30ab\u30d0\u30fc\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3002DKIM\u306b\u306f <strong>\u30bb\u30ec\u30af\u30bf\u30fc<\/strong>-\u540d\u524d\uff08\u4f8b <em>s1<\/em>, <em>s2<\/em>)\u3092\u4f7f\u3063\u3066\u3001\u30e1\u30fc\u30eb\u3092\u4e2d\u65ad\u3055\u305b\u308b\u3053\u3068\u306a\u304f\u30ad\u30fc\u3092\u56de\u8ee2\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002DMARC\u3067\u306f\u3001\u307e\u305a <strong>p=\u306a\u3057<\/strong> \u306b\u95a2\u3059\u308b\u5206\u6790\u3092\u53ce\u96c6\u3059\u308b\u3002 <em>\u30eb\u30a2<\/em>-\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u3059\u3079\u3066\u304c\u5b89\u5b9a\u3057\u305f\u3089\u3001\u5f90\u3005\u306b <strong>\u9694\u96e2<\/strong> \u305d\u3057\u3066 <strong>\u62d2\u3080<\/strong>\u30aa\u30d7\u30b7\u30e7\u30f3\u3067 <em>pct=<\/em>\u30921\u30d1\u30fc\u30bb\u30f3\u30c8\u3060\u3051\u5f37\u5316\u3059\u308b\u3002\u3053\u3046\u3057\u3066\u79c1\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u914d\u4fe1\u6027\u306e\u5b89\u5b9a\u3057\u305f\u30d0\u30e9\u30f3\u30b9\u3092\u898b\u3064\u3051\u308b\u306e\u3067\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\/2025\/09\/emaildomainsetup4923.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u30c6\u30b9\u30c8\u3068\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306e\u305f\u3081\u306e\u30c4\u30fc\u30eb<\/h2>\n\n<p>\u79c1\u306f\u30c6\u30b9\u30c8\u30c4\u30fc\u30eb\u3067\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u8b66\u544a\u306b\u306f\u5373\u5ea7\u306b\u5bfe\u5fdc\u3057\u307e\u3059\u3002MX\u30c1\u30a7\u30c3\u30af\u3084\u7ba1\u7406\u30c4\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u3088\u3046\u306a\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u8aa4\u3063\u305f\u30db\u30b9\u30c8\u540d\u3001\u8aa4\u3063\u305f\u512a\u5148\u9806\u4f4d\u3001TXT\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u6b20\u843d\u306a\u3069\u3092\u793a\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u3088\u308a\u8a73\u7d30\u306a\u5206\u6790\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u60c5\u5831\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/dns%e3%81%ae%e8%aa%a4%e8%a8%ad%e5%ae%9a%e3%82%92%e8%aa%8d%e8%ad%98%e3%81%99%e3%82%8b-%e3%82%a8%e3%83%a9%e3%83%bc%e5%88%86%e6%9e%90%e3%83%84%e3%83%bc%e3%83%ab-dns%e3%81%ae%e3%83%92%e3%83%b3%e3%83%88\/\">DNS\u30a8\u30e9\u30fc\u306e\u8a8d\u8b58<\/a>\u539f\u56e0\u3092\u304d\u308c\u3044\u306b\u5206\u3051\u308b\u305f\u3081\u306b\u3002\u79c1\u306f\u5909\u66f4\u306e\u305f\u3073\u306b\u3001\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3001\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u3001\u8a8d\u8a3c\u3092\u30c6\u30b9\u30c8\u3057\u3066\u3044\u308b\u3002\u3053\u3046\u3057\u3066 <strong>MX\u30ec\u30b3\u30fc\u30c9<\/strong> \u6c38\u7d9a\u7684\u306b\u6a5f\u80fd\u3057\u3001\u8ffd\u8de1\u53ef\u80fd\u3067\u3042\u308b\u3002<\/p>\n\n<h2>\u5178\u578b\u7684\u306a\u30df\u30b9\u3092\u907f\u3051\u308b<\/h2>\n\n<p>\u79c1\u306f\u3001\u540c\u3058MX\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u77db\u76fe\u3059\u308b\u3053\u3068\u3092\u8a31\u3055\u306a\u3044\u3002 <strong>\u512a\u5148\u9806\u4f4d<\/strong> \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u7570\u306a\u308b\u5834\u5408\u30db\u30b9\u30c8\u3092\"@\"\u307e\u305f\u306f\u5e0c\u671b\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u6b63\u3057\u304f\u8a2d\u5b9a\u3057\u3001\u30e1\u30fc\u30eb\u304c\u3069\u3053\u306b\u3082\u884c\u304b\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002\u9577\u3059\u304e\u308bTTL\u306f\u3001\u305d\u306e\u5f8c\u306e\u5909\u63db\u3092\u9045\u304f\u3059\u308b\u306e\u3067\u907f\u3051\u308b\u3002SPF\u3001DKIM\u3001DMARC\u306e\u8a2d\u5b9a\u306f\u5fd8\u308c\u306a\u3044\u3002\u5909\u66f4\u5f8c\u306f\u5fc5\u305a\u30c6\u30b9\u30c8\u3092\u884c\u3044\u3001\u6b21\u306e\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u554f\u984c\u70b9<\/strong> \u76f4\u63a5\u8a8d\u8b58\u3059\u308b\u3002<\/p>\n\n<h2>\u5931\u6557\u306e\u306a\u3044\u79fb\u884c\u8a08\u753b<\/h2>\n\n<p>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u5909\u66f4\u3059\u308b\u524d\u306b <strong>TTL<\/strong> \u79c1\u306eMX\u30ec\u30b3\u30fc\u30c9\u3068\u95a2\u9023\u3059\u308bTXT\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u6570\u5206-\u7406\u60f3\u7684\u306b\u306f\u7de0\u3081\u5207\u308a\u306e24\u301c48\u6642\u9593\u524d-\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u79c1\u306f\u3059\u3067\u306b\u65b0\u3057\u3044\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3067\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3068\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u4e26\u884c\u53d7\u3051\u5165\u308c<\/strong> (\u4e8c\u91cd\u914d\u4fe1\u307e\u305f\u306f\u8ee2\u9001)\u3092\u4f7f\u7528\u3057\u3066\u3001DNS\u306e\u5207\u308a\u66ff\u3048\u4e2d\u306b\u30e1\u30fc\u30eb\u304c\u5931\u308f\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306f\u4e21\u65b9\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u53d7\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u76e3\u8996\u3057\u3001\u9001\u4fe1\u8005\u306e\u5927\u534a\u304c\u65b0\u3057\u3044\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u306e\u307f\u3001\u53e4\u3044MX\u3092\u30aa\u30d5\u306b\u5207\u308a\u66ff\u3048\u307e\u3059\u3002\u304d\u308c\u3044\u306a\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u30d7\u30e9\u30f3\u306e\u305f\u3081\u306b\u3001\u53e4\u3044\u5024\u3092\u30e1\u30e2\u3057\u3066\u304a\u304d\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3059\u3050\u306b\u5207\u308a\u66ff\u3048\u3089\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h2>\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3001\u30ad\u30e3\u30c3\u30c1\u30aa\u30fc\u30eb<\/h2>\n\n<p>\u79c1\u306f\u6b21\u306e\u3088\u3046\u306b\u533a\u5225\u3057\u3066\u3044\u308b\u3002 <strong>\u5225\u540d<\/strong> (\u540c\u3058\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u5225\u306e\u30a2\u30c9\u30ec\u30b9\uff09\u3068 <strong>\u8ee2\u9001<\/strong> (\u5225\u306e\u5b9b\u5148\u3078\u306e\u914d\u9001\uff09\u3002\u8ee2\u9001\u306f\u3001\u8ee2\u9001\u5148\u30b5\u30fc\u30d0\u30fc\u304c\u8a8d\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001SPF\u30c1\u30a7\u30c3\u30af\u3092\u7834\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u306f\u6b21\u306e\u3088\u3046\u306b\u8003\u3048\u308b\u3002 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u3092\u5b89\u5b9a\u3055\u305b\u3001\u53ef\u80fd\u3067\u3042\u308c\u3070\u8ee2\u9001\u30b5\u30fc\u30d0\u30fc\u3067SRS\uff08Sender Rewriting Scheme\uff09\u3092\u4f7f\u7528\u3059\u308b\u3002A <strong>\u30ad\u30e3\u30c3\u30c1\u30aa\u30fc\u30eb<\/strong> \u5b9f\u7528\u7684\u3067\u3059\u304c\u3001\u30b9\u30d1\u30e0\u304c\u5897\u3048\u307e\u3059\u3002\u4f8b\u3048\u3070 <em>\u30a4\u30f3\u30d5\u30a9<\/em> \u6216\u3044\u306f <em>\u30b5\u30dd\u30fc\u30c8<\/em> \u79c1\u306f\u3001\u3084\u308a\u6b8b\u3057\u304c\u306a\u3044\u3088\u3046\u306b\u660e\u78ba\u306a\u8cac\u4efb\u3092\u8ab2\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\/2025\/09\/emaildomainsetup_6392.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>E\u30e1\u30fc\u30eb\u30fb\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u6bd4\u8f03<\/h2>\n\n<p>\u79c1\u306f\u3001DNS\u306e\u4f7f\u3044\u3084\u3059\u3055\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3001\u5e45\u5e83\u3044\u6a5f\u80fd\u3001\u30b5\u30dd\u30fc\u30c8\u306b\u57fa\u3065\u3044\u3066\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u9078\u3093\u3067\u3044\u307e\u3059\u3002\u4f01\u696d\u306b\u3068\u3063\u3066\u3001DNS\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u660e\u78ba\u306a\u7ba1\u7406\u306f\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3084\u512a\u308c\u305f\u30d8\u30eb\u30d7\u30c6\u30ad\u30b9\u30c8\u3068\u540c\u3058\u304f\u3089\u3044\u91cd\u8981\u3067\u3059\u3002\u79c1\u306f\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u304c\u63d0\u4f9b\u3059\u308b\u900f\u660e\u6027\u306e\u9ad8\u3044MX\u4ed5\u69d8\u3068\u8ffd\u52a0\u30ec\u30b3\u30fc\u30c9\u306b\u6ce8\u76ee\u3057\u3066\u3044\u307e\u3059\u3002\u8fc5\u901f\u306a\u30b5\u30dd\u30fc\u30c8\u306f\u3001\u914d\u4fe1\u306e\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u6642\u9593\u3092\u7bc0\u7d04\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u6b21\u306e\u8868\u306f\u3001\u79c1\u304cDNS\u3092\u5229\u7528\u3059\u308b\u969b\u306b\u5f79\u7acb\u3064\u3082\u306e\u3067\u3059\u3002 <strong>\u5206\u985e<\/strong> \u30dd\u30d4\u30e5\u30e9\u30fc\u306a\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3060\u3002<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30d7\u30ed\u30d0\u30a4\u30c0<\/th>\n      <th>\u96fb\u5b50\u30e1\u30fc\u30eb\u7d71\u5408<\/th>\n      <th>DNS\u7ba1\u7406<\/th>\n      <th>\u30b5\u30dd\u30fc\u30c8<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>webhoster.de<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044<\/td>\n      <td>\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb<\/td>\n      <td>\u7d20\u6674\u3089\u3057\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>Google\u30ef\u30fc\u30af\u30b9\u30da\u30fc\u30b9<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044<\/td>\n      <td>\u30b7\u30f3\u30d7\u30eb<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8365<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044<\/td>\n      <td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td>\n      <td>\u30b0\u30c3\u30c9<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30d7\u30ed\u30c8\u30f3\u30fb\u30e1\u30fc\u30eb<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044<\/td>\n      <td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td>\n      <td>\u30b0\u30c3\u30c9<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u624b\u9806\uff1a\u30d7\u30ed\u30c8\u30f3\u30e1\u30fc\u30eb\u306e\u8a2d\u5b9a<\/h2>\n\n<p>Proton\u306e\u7ba1\u7406\u30a8\u30ea\u30a2\u3067\u81ea\u5206\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u63a5\u7d9a\u3057\u3001\u6240\u6709\u6a29\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001DNS\u30be\u30fc\u30f3\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308bMX\u3001SPF\u3001DKIM\u3001DMARC\u30ec\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u307e\u3059\u3002Proton\u306f\u3001\u3059\u3079\u3066\u306e\u30ad\u30fc\u304c\u6b63\u3057\u304f\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u307e\u305f <strong>\u7f72\u540d<\/strong> \u304c\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u306a\u3063\u3066\u3044\u308b\u3002DNS\u914d\u4fe1\u306e\u5f8c\u3001\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3067\u53d7\u4fe1\u3068\u9001\u4fe1\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u30d7\u30ed\u30c8\u30f3\u30d1\u30cd\u30eb\u3067\u76f4\u63a5\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3001\u8ee2\u9001\u3092\u8a2d\u5b9a\u3057\u3001\u79c1\u306e <strong>\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7<\/strong> \u5b8c\u5168\u306b\u6709\u52b9\u3060\u3002<\/p>\n\n<h2>Google\u30ef\u30fc\u30af\u30b9\u30da\u30fc\u30b9\u3068Microsoft 365<\/h2>\n\n<p>Google Workspace\u307e\u305f\u306fMicrosoft 365\u3092\u81ea\u5206\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u6709\u52b9\u5316\u3057\u3001\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u30a6\u30a3\u30b6\u30fc\u30c9\u306b\u5f93\u3044\u307e\u3059\u3002Google\u306e\u5834\u5408\u3001\u73fe\u5728\u306eMX\u30c7\u30d5\u30a9\u30eb\u30c8\u3001\u4f8b\u3048\u3070\u512a\u5148\u5ea61\u306e \"smtp.google.com \"\u3068\u8ffd\u52a0\u306eTXT\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u63a1\u7528\u3059\u308b\u3002Microsoft 365\u3067\u306f\u3001\u7ba1\u7406\u30bb\u30f3\u30bf\u30fc\u3067\u5fc5\u8981\u306a\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u4f5c\u6210\u3057\u3001\u78ba\u8a8d\u304c\u901a\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u305d\u306e\u5f8c\u3001\u53d7\u4fe1\u3001\u9001\u4fe1\u3001SPF\u691c\u8a3c\u3001DKIM\u7f72\u540d\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3002\u30c6\u30b9\u30c8\u306b\u30a8\u30e9\u30fc\u304c\u306a\u3051\u308c\u3070\u3001\u79c1\u306f <strong>\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0<\/strong> \u751f\u7523\u6027\u3092\u9ad8\u3081\u3001\u5b9a\u671f\u7684\u306a\u898b\u76f4\u3057\u3092\u8a08\u753b\u3059\u308b\u3002<\/p>\n\n<h2>\u72ec\u81ea\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068DNS\u59d4\u4efb<\/h2>\n\n<p>\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u79c1\u306f\u81ea\u5206\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3092\u904b\u7528\u3057\u3001\u81ea\u5206\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u5f7c\u3089\u306b\u59d4\u4efb\u3057\u307e\u3059\u3002\u79c1\u306f\u3001\u304d\u308c\u3044\u306a\u30be\u30fc\u30f3\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3001\u6b63\u3057\u3044NS\u30a8\u30f3\u30c8\u30ea\u3001\u30ec\u30b8\u30b9\u30c8\u30e9\u3068\u306e\u9069\u5207\u306a\u30b0\u30eb\u30fc\u30ec\u30b3\u30fc\u30c9\u306b\u4f9d\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u59d4\u4efb\u306f\u3001\u8cac\u4efb\u3092\u660e\u78ba\u306b\u3057\u3001MX\u3001SPF\u3001DKIM\u3001DMARC\u3092\u5909\u66f4\u3059\u308b\u969b\u306e\u7d4c\u8def\u3092\u77ed\u7e2e\u3057\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30af\u30c8\u306b\u59cb\u3081\u308b\u305f\u3081\u306b\u3001\u79c1\u306f <a href=\"https:\/\/webhosting.de\/ja\/%e8%87%aa%e5%88%86%e3%81%ae%e3%83%8d%e3%83%bc%e3%83%a0%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc%e3%82%92%e8%a8%ad%e5%ae%9a%e3%81%99%e3%82%8b-dns%e3%82%be%e3%83%bc%e3%83%b3-%e3%83%89%e3%83%a1%e3%82%a4\/\">\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306e\u8a2d\u5b9a<\/a>.\u79c1\u306f\u3053\u3046\u3057\u3066\u653f\u6a29\u3092\u30d5\u30eb\u7a3c\u50cd\u3055\u305b\u3066\u3044\u308b\u3002 <strong>\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb<\/strong> \u305d\u3057\u3066\u3001\u3088\u308a\u7d20\u65e9\u304f\u53cd\u5fdc\u3059\u308b\u3053\u3068\u304c\u3067\u304d\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\/2025\/09\/email-domain-setup-9482.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u6642\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff1aTLS\u3001MTA-STS\u3001DANE<\/h2>\n\n<p>\u79c1\u306f\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u6b21\u306e\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u308b\u3002 <strong>\u30c6\u30a3\u30fc\u30a8\u30eb\u30a8\u30b9<\/strong> \u306f\u3001\u9001\u53d7\u4fe1\u30e1\u30fc\u30eb\u306e\u9001\u53d7\u4fe1\u3092\u5f37\u5236\u307e\u305f\u306f\u512a\u5148\u3059\u308b\u3002\u3068\u306f <strong>MTA-STS<\/strong> \u3069\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u6709\u52b9\u304b\u3001TLS\u304c\u671f\u5f85\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u53d7\u4fe1\u8005\u306b\u4f1d\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff1b <strong>TLS-RPT<\/strong> \u306fTLS\u306e\u554f\u984c\u306b\u3064\u3044\u3066\u306e\u30ec\u30dd\u30fc\u30c8\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u308b\u3002\u3082\u3057\u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u304c <strong>\u30c7\u30a3\u30ca\u30bb\u30c3\u30af<\/strong> \u304c\u7f72\u540d\u3055\u308c\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u304cTLSA\u30ec\u30b3\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u79c1\u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u3067 <strong>DANE<\/strong> \u3092\u8ffd\u52a0\u3057\u3066\u3044\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u653b\u6483\u306e\u30ea\u30b9\u30af\u304c\u8efd\u6e1b\u3055\u308c\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u6697\u53f7\u5316\u306e\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u308b\u3002<\/p>\n\n<h2>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3001\u5206\u96e2<\/h2>\n\n<p>\u79c1\u306f\u4e00\u7dd2\u306b\u4ed5\u4e8b\u3092\u3059\u308b\u306e\u304c\u597d\u304d\u3060\u3002 <strong>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3<\/strong>\u3092\u4f7f\u3063\u3066\u7570\u306a\u308b\u30e1\u30fc\u30eb\u30d5\u30ed\u30fc\u3092\u5206\u3051\u3066\u3044\u308b\uff1a\u4f8b\u3048\u3070\u3001\u79c1\u306f <em>mail.example.de<\/em> \u306e\u3088\u3046\u306a\u5225\u306e\u9001\u4fe1\u7528\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u304c\u5fc5\u8981\u3067\u3059\u3002 <em>mg.example.de<\/em> \u3092\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u3084\u30b7\u30b9\u30c6\u30e0\u30e1\u30fc\u30eb\u7528\u306b\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8a8d\u8a3c\u3092\u5206\u96e2\u3057\uff08\u72ec\u81ea\u306eSPF\/DKIM\u30ec\u30b3\u30fc\u30c9\uff09\u3001\u76e3\u8996\u3092\u7c21\u7d20\u5316\u3057\u3001\u5927\u91cf\u30e1\u30fc\u30eb\u306e\u30a8\u30e9\u30fc\u304c\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u306b\u5f71\u97ff\u3059\u308b\u306e\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u5f71\u97ff\u3092\u53d7\u3051\u308b\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306eMX\u30ec\u30b3\u30fc\u30c9\u3068A\/AAA\u30ec\u30b3\u30fc\u30c9\u304c\u5b8c\u5168\u3067\u4e00\u8cab\u3057\u3066\u3044\u308b\u3053\u3068\u3082\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h2>\u30d6\u30ed\u30c3\u30af\u30ea\u30b9\u30c8\u3001\u30d0\u30a6\u30f3\u30b9\u3001\u914d\u9054\u306e\u30cf\u30fc\u30c9\u30eb<\/h2>\n\n<p>\u79c1\u306f\u3001\u9001\u4fe1\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u3084MX\u306e\u5b9b\u5148\u304c\u4ee5\u4e0b\u306e\u3082\u306e\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u76e3\u8996\u3057\u3066\u3044\u308b\u3002 <strong>\u30d6\u30ed\u30c3\u30af\u30ea\u30b9\u30c8<\/strong> (RBL\uff09\u304c\u73fe\u308c\u308b\u3002\u3088\u308a\u591a\u304f\u306e <strong>\u30bd\u30d5\u30c8\u30d0\u30a6\u30f3\u30b9\uff084xx\uff09<\/strong> \u3092\u5f85\u3064\u3001\u3042\u308b\u3044\u306f\u5f8c\u65e5\u914d\u9001\u3092\u8a66\u307f\u308b\u3002 <strong>\u30cf\u30fc\u30c9\u30d0\u30a6\u30f3\u30ba (5xx)<\/strong> \u30a8\u30e9\u30fc\u30c6\u30ad\u30b9\u30c8\uff08\u300cSPF fail\u300d\u3001\u300cDKIM bad signature\u300d\u3001\u300cMailbox full\u300d\u3001\u300cUser unknown\u300d\u306a\u3069\uff09\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u306e\u5834\u5408\u306f\u3001\u8a2d\u5b9a\u3092\u53b3\u3057\u304f\u305b\u305a\u306b\u518d\u9001\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306f\u3001\u98a8\u8a55\u88ab\u5bb3\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u30ea\u30b9\u30c8\u3092\u30af\u30ea\u30fc\u30f3\u306b\u4fdd\u3061\u3001\u914d\u4fe1\u505c\u6b62\u3092\u7ba1\u7406\u3057\u3001\u914d\u4fe1\u4e0d\u80fd\u306a\u30a2\u30c9\u30ec\u30b9\u3092\u524a\u9664\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h2>\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3001\u30d7\u30ed\u30c8\u30b3\u30eb\u3001\u30a2\u30af\u30bb\u30b9<\/h2>\n\n<p>\u3067IMAP\/POP3\/SMTP\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 <strong>\u5f37\u529b\u306a\u30d1\u30b9\u30ef\u30fc\u30c9<\/strong> \u3092\u8d77\u52d5\u3059\u308b\u3002 <strong>2FA<\/strong>\u53ef\u80fd\u3067\u3042\u308c\u3070\u3002\u79c1\u306f\u30b5\u30fc\u30d0\u30fc\u540d\u3001\u30dd\u30fc\u30c8\u3001TLS\/STARTTLS\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u3092\u6587\u66f8\u5316\u3057\u3001\u53e4\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u7528\u306b\u30a2\u30d7\u30ea\u306e\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u79c1\u306f <strong>\u30af\u30a9\u30fc\u30bf<\/strong> (\u30b9\u30c8\u30ec\u30fc\u30b8\u30fb\u30af\u30a9\u30fc\u30bf\uff09\u3092\u73fe\u5b9f\u7684\u306b\u8a2d\u5b9a\u3057\u3001\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u4e00\u676f\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u3001\u5927\u5bb9\u91cf\u306e\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30a6\u30c8\u30bd\u30fc\u30b7\u30f3\u30b0\u307e\u305f\u306f\u81ea\u52d5\u7684\u306b\u30a2\u30fc\u30ab\u30a4\u30d6\u3059\u308b\u30eb\u30fc\u30eb\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u5b89\u5b9a\u3057\u3001\u30e1\u30fc\u30eb\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n<h2>\u30bb\u30eb\u30d5\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3068\u30af\u30e9\u30a6\u30c9\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc<\/h2>\n\n<p>\u79c1\u81ea\u8eab\u304c <strong>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc<\/strong> \u56fa\u5b9aIP\u3001\u6b63\u3057\u3044IP\u30a2\u30c9\u30ec\u30b9\u304c\u5fc5\u8981 <strong>PTR<\/strong>-\u30ec\u30fc\u30c8\u5236\u9650\u3001\u30ea\u30d0\u30fc\u30b9DNS\u3001\u4e00\u8cab\u3057\u305fHELO\/EHLO\u30db\u30b9\u30c8\u540d\u3001\u5f37\u529b\u306a\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u3001\u30af\u30ea\u30fc\u30f3\u306a\u30d1\u30c3\u30c1\u7ba1\u7406\u3002\u30ad\u30e5\u30fc\u3092\u5b89\u5b9a\u3055\u305b\u308b\u305f\u3081\u306b\u3001\u30ec\u30fc\u30c8\u5236\u9650\u3001\u30d0\u30c3\u30af\u30d7\u30ec\u30c3\u30b7\u30e3\u30fc\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u591a\u304f\u306e\u7d44\u7e54\u306b\u3068\u3063\u3066 <strong>\u30af\u30e9\u30a6\u30c9\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc<\/strong> \u30c1\u30fc\u30e0\u306e\u30ea\u30bd\u30fc\u30b9\u3001\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u8981\u4ef6\u3001\u4e88\u7b97\u306b\u5fdc\u3058\u3066\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n<h2>DNSSEC\u3068\u30be\u30fc\u30f3\u885b\u751f<\/h2>\n\n<p>\u79c1\u306f\u81ea\u5206\u306e\u30be\u30fc\u30f3\u306b\u3053\u3046\u7f72\u540d\u3057\u3066\u3044\u308b\u3002 <strong>\u30c7\u30a3\u30ca\u30bb\u30c3\u30af<\/strong>\u79c1\u306e\u30ec\u30b8\u30b9\u30c8\u30e9\u3068DNS\u30d7\u30ed\u30d0\u30a4\u30c0\u304c\u305d\u308c\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3001DS\u30ec\u30b3\u30fc\u30c9\u3092\u6b63\u3057\u304f\u4fdd\u5b58\u3057\u3066\u3044\u308c\u3070\u3002\u79c1\u306f\u30be\u30fc\u30f3\u3092\u30af\u30ea\u30a2\u306a\u72b6\u614b\u306b\u3057\u3066\u3044\u307e\u3059\uff1a\u53e4\u3044\u30a8\u30f3\u30c8\u30ea\u3001\u77db\u76fe\u3059\u308bCNAME\u3001\u8907\u6570\u306eSPF\u30a8\u30f3\u30c8\u30ea\uff08\u79c1\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u3092 <em>\u3072\u3068\u3064<\/em> SPF\u306eTXT\u30ec\u30b3\u30fc\u30c9)\u3002\u5927\u304d\u306a\u5909\u66f4\u3092\u52a0\u3048\u308b\u524d\u306b <strong>\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30fb\u30b3\u30d4\u30fc<\/strong> \u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u3059\u3050\u306b\u623b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n<h2>\u6700\u7d42\u5408\u683c\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n\n<ul>\n  <li>MX\u30ec\u30b3\u30fc\u30c9\u306fA\/AAA\u306e\u6709\u52b9\u306a\u30db\u30b9\u30c8\u540d\u3092\u6307\u3057\u3001\u512a\u5148\u9806\u4f4d\u306f\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n  <li>SPF-TXT\u3042\u308a\u3001\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u5236\u9650\u9075\u5b88\u3001\u91cd\u8907\u306a\u3057<\/li>\n  <li>DKIM-Selector\u304c\u516c\u958b\u3055\u308c\u3001\u7f72\u540d\u304c\u6709\u52b9\u3067\u3042\u308b\u3002<\/li>\n  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