{"id":12648,"date":"2025-09-20T14:59:57","date_gmt":"2025-09-20T12:59:57","guid":{"rendered":"https:\/\/webhosting.de\/spf-dkim-dmarc-plesk-guide-sicherheit-tuning-professional\/"},"modified":"2025-09-20T14:59:57","modified_gmt":"2025-09-20T12:59:57","slug":"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","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-plesk-guide-sicherheit-tuning-professional\/","title":{"rendered":"Plesk\u3067SPF\u3001DKIM\u3001DMARC\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u7d39\u4ecb\u3059\u308b\u3002 <strong>SPF DKIM<\/strong> \u3068Plesk\u306eDMARC\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001E\u30e1\u30fc\u30eb\u304c\u78ba\u5b9f\u306b\u8a8d\u8a3c\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002DNS\u30a8\u30f3\u30c8\u30ea\u3001Plesk\u30b9\u30a4\u30c3\u30c1\u3001\u30c6\u30b9\u30c8\u65b9\u6cd5\u306a\u3069\u3001\u914d\u4fe1\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u3001\u4e0d\u6b63\u306a\u9001\u4fe1\u8005\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u305f\u3081\u306e\u660e\u78ba\u306a\u624b\u9806\u304c\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>SPF<\/strong> \u306f\u3001\u3069\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u3042\u306a\u305f\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u6a29\u9650\u3092\u6301\u3064\u304b\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/li>\n  <li><strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u9001\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u7f72\u540d\u3057\u3001\u4e0d\u6b63\u64cd\u4f5c\u304b\u3089\u4fdd\u8b77\u3059\u308b\u3002<\/li>\n  <li><strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> SPF\/DKIM\u3092\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3084\u30ec\u30dd\u30fc\u30c8\u3068\u30ea\u30f3\u30af\u3055\u305b\u308b\u3002<\/li>\n  <li><strong>\u30d7\u30ec\u30b9\u30af<\/strong> \u30af\u30a4\u30c3\u30af\u30b9\u30bf\u30fc\u30c8\u306e\u305f\u3081\u306e\u30a6\u30a3\u30b6\u30fc\u30c9\u3068DNS\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/li>\n  <li><strong>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/strong> \u306eDMARC\u30ec\u30dd\u30fc\u30c8\u306f\u3001\u904b\u7528\u4e2d\u306e\u30dd\u30ea\u30b7\u30fc\u3092\u3088\u308a\u9bae\u660e\u306b\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n<h2>Plesk\u3067\u524d\u63d0\u6761\u4ef6\u3092\u78ba\u8a8d\u3059\u308b<\/h2>\n\n<p>\u8a2d\u5b9a\u3092\u884c\u3046\u524d\u306b\u3001\u79c1\u306f <strong>\u30d7\u30ec\u30b9\u30af<\/strong> \u305d\u3057\u3066DNS\u7ba1\u7406\u3002\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d3\u30b9\u306fSPF\u3001DKIM\u3001DMARC\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002\u307e\u305f\u3001\u30c9\u30e1\u30a4\u30f3\u304cPlesk DNS\u306bDNS\u30be\u30fc\u30f3\u3092\u6301\u3064\u304b\u3001\u5916\u90e8\u30d7\u30ed\u30d0\u30a4\u30c0\u306b\u6301\u3064\u304b\u3082\u78ba\u8a8d\u3057\u307e\u3059\u3002 <strong>\u30d7\u30ec\u30b9\u30af<\/strong> \u3092\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u30b9\u30e0\u30fc\u30ba\u306a\u904b\u7528\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u30db\u30b9\u30c8\u540d\u3001\u9006\u5f15\u304dDNS\u3001\u6709\u52b9\u306aTLS\u8a3c\u660e\u66f8\u3092\u304d\u308c\u3044\u306b\u3057\u3066\u304a\u304f\u3002\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3092\u304d\u308c\u3044\u306b\u3057\u3066\u304a\u304f\u3068\u3001\u5f8c\u3067\u591a\u304f\u306e\u6642\u9593\u3092\u7bc0\u7d04\u3067\u304d\u308b\u3002 <strong>\u8a55\u5224<\/strong>.<\/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\/2025\/09\/plesk-mailkonfiguration-8192.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>Plesk\u3067SPF\u3092\u8a2d\u5b9a\u3059\u308b - \u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7<\/h2>\n\n<p>\u624b\u59cb\u3081\u306b\u3001\u300c\u30c4\u30fc\u30eb\u3068\u8a2d\u5b9a\u300d\u2192\u300cDNS\u8a2d\u5b9a\u300d\u3092\u958b\u304d\u3001\u6b21\u306e\u3088\u3046\u306b\u59cb\u307e\u308bTXT\u30ec\u30b3\u30fc\u30c9\u3092\u691c\u7d22\u3059\u308b\u3002 <strong>v=spf1<\/strong> \u304c\u59cb\u307e\u308b\u3002\u4f8b\u3048\u3070\u3001\u6b20\u3051\u3066\u3044\u305f\u3089\u3001\u305d\u308c\u3092\u3064\u3051\u308b\uff1a <code>v=spf1 a mx include:yourmailprovider.de -all<\/code>\u8a31\u53ef\u3055\u308c\u305f\u30b7\u30b9\u30c6\u30e0\u306f\u9001\u4fe1\u3092\u8a31\u53ef\u3055\u308c\u3001\u305d\u308c\u4ee5\u5916\u306f\u30d6\u30ed\u30c3\u30af\u3055\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u3002\u30c9\u30e1\u30a4\u30f3\u304cMicrosoft 365\u3001Google Workspace\u3001\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30b5\u30fc\u30d3\u30b9\u306a\u3069\u306e\u8ffd\u52a0\u9001\u4fe1\u8005\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u79c1\u306f\u9069\u5207\u306a\u9001\u4fe1\u8005\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002 <strong>\u542b\u3080<\/strong>-\u305d\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4fdd\u5b58\u5f8c\u3001\u5909\u66f4\u304c\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u53cd\u6620\u3055\u308c\u308b\u307e\u3067\u6700\u592748\u6642\u9593\u5f85\u3061\u3001\u9078\u629e\u3057\u305f\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u9001\u308a\u3001SPF\u30c1\u30a7\u30c3\u30ab\u30fc\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3002\u5404\u30e1\u30ab\u30cb\u30ba\u30e0\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u95a2\u3059\u308b\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u5206\u985e\u306f <a href=\"https:\/\/webhosting.de\/ja\/%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e8%aa%8d%e8%a8%bc-spf-dkim-dmarc-%e3%82%ac%e3%82%a4%e3%83%89\/\">\u30b3\u30f3\u30d1\u30af\u30c8\u30ac\u30a4\u30c9<\/a>\u6700\u3082\u91cd\u8981\u306a\u30b7\u30ca\u30ea\u30aa\u3092\u8aac\u660e\u3057\u3066\u3044\u308b\u3002<\/p>\n\n<h2>Plesk\u3067DKIM\u3092\u6709\u52b9\u306b\u3059\u308b - \u3053\u308c\u304c\u305d\u306e\u65b9\u6cd5\u3067\u3059\u3002<\/h2>\n\n<p>\u306e\u305f\u3081\u306b <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u30c4\u30fc\u30eb\u3068\u8a2d\u5b9a\u300d\u2192\u300c\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u8a2d\u5b9a\u300d\u3067\u3001\u9001\u4fe1\u30e1\u30fc\u30eb\u306b\u7f72\u540d\u3059\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u305d\u306e\u5f8c\u3001\u30c9\u30e1\u30a4\u30f3\u30ec\u30d9\u30eb\u3067 \"\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3068\u30c9\u30e1\u30a4\u30f3\"\u2192\u30c9\u30e1\u30a4\u30f3\u2192\"\u30e1\u30fc\u30eb\"\u2192\"\u8a2d\u5b9a \"\u3092\u958b\u304d\u3001\u5404\u30c9\u30e1\u30a4\u30f3\u3067\u7f72\u540d\u304c\u30aa\u30f3\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002DNS\u3092\u5916\u90e8\u3067\u7ba1\u7406\u3059\u308b\u5834\u5408\u3001\u79c1\u306f\u4ee5\u4e0b\u306e\u30b5\u30a4\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3059\u308b\u3002 <strong>\u30d7\u30ec\u30b9\u30af<\/strong> \u751f\u6210\u3055\u308c\u305fDKIM\u516c\u958b\u9375\u3092DNS\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306bTXT\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u5165\u529b\u3059\u308b\uff08\u30bb\u30ec\u30af\u30bf\u540d\u306b\u6ce8\u610f\uff09\u3002\u6700\u592724\uff5e48\u6642\u9593\u5f8c\u3001\u53d7\u4fe1\u8005\u306fDKIM\u7f72\u540d\u3092\u691c\u8a3c\u3059\u308b\u306f\u305a\u3067\u3059\u3002\u79c1\u306fDKIM\u30c1\u30a7\u30c3\u30af\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u9001\u308b\u304b\u3001\u30d8\u30c3\u30c0\u30fc\u30c1\u30a7\u30c3\u30af\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002\u6709\u52b9\u306a\u7f72\u540d\u306f <strong>\u914d\u9054\u53ef\u80fd\u6027<\/strong> \u76ee\u306b\u3064\u304f\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\/plesk_spf_dkim_dmarc_9321.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>DMARC\u30dd\u30ea\u30b7\u30fc\u306e\u5b9a\u7fa9\u3068\u30ec\u30dd\u30fc\u30c8\u306e\u4f7f\u7528<\/h2>\n\n<p>\u4eca\u3001\u79c1\u306f <strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u3092TXT\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066 <code>_dmarc.yourdomain.tld<\/code> \u3092\u6301\u3064\u3002 <code>v=DMARC1; p=quarantine; rua=mailto:reports@deinedomain.tld; ruf=mailto:forensics@deinedomain.tld; adkim=s; aspf=s<\/code>.\u30bf\u30b0 <strong>p<\/strong>, <strong>\u30eb\u30a2<\/strong> \u305d\u3057\u3066 <strong>\u30b3\u30fc\u30eb<\/strong> \u7ba1\u7406\u65b9\u91dd\u3068\u5831\u544a <code>\u30a2\u30c9\u30ad\u30e0<\/code>\/<code>\u30a2\u30b9\u30d7<\/code> \u53b3\u5bc6\u306a\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\uff08strict\uff09\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u5b9f\u969b\u306b\u306f <code>p=\u306a\u3057<\/code>2\u9031\u9593\u304b\u30894\u9031\u9593\u304b\u3051\u3066\u5831\u544a\u66f8\u3092\u8a55\u4fa1\u3057\u3001\u305d\u306e\u5f8c\u3001\u6b21\u306e\u5831\u544a\u66f8\u3092\u4f5c\u6210\u3059\u308b\u3002 <code>\u9694\u96e2<\/code> \u6216\u3044\u306f <code>\u62d2\u3080<\/code> .\u30ec\u30dd\u30fc\u30c8\u306f\u3001\u3069\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u3042\u306a\u305f\u306e\u4ee3\u308f\u308a\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3001SPF\u307e\u305f\u306fDKIM\u304c\u5931\u6557\u3057\u305f\u5834\u6240\u3092\u793a\u3057\u3001\u76f4\u63a5\u4fee\u6b63\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3088\u308a\u8a73\u7d30\u306a\u4e00\u9023\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u306f <a href=\"https:\/\/webhosting.de\/ja\/dmarc%e3%81%ae%e5%ae%9f%e8%a3%85%e9%9b%bb%e5%ad%90%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\/\">DMARC\u306e\u5b9f\u88c5<\/a> \u5177\u4f53\u7684\u306a\u4f8b\u3068\u3068\u3082\u306b\u3002<\/p>\n\n<h2>DNS\u306e\u4f1d\u64ad\u3001\u30c6\u30b9\u30c8\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n<p>DNS\u306e\u5909\u66f4\u306b\u306f\u6bce\u56de\u6642\u9593\u304c\u304b\u304b\u308b\u306e\u3067\u3001\u4e16\u754c\u7684\u306aDNS\u306e\u5909\u66f4\u306b\u306f\u6700\u592748\u6642\u9593\u3092\u4e88\u5b9a\u3057\u3066\u3044\u308b\u3002 <strong>\u4f1d\u64ad<\/strong> \u30aa\u30f3\u3002\u3053\u306e\u6bb5\u968e\u3067\u306f\u3001\u5916\u90e8\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u9001\u308a\u3001\u30d8\u30c3\u30c0\u30fc\u306e <strong>spf=\u30d1\u30b9<\/strong>, <strong>dkim=\u30d1\u30b9<\/strong> \u305d\u3057\u3066 <strong>dmarc=pass<\/strong>.\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3057\u305f\u5834\u5408 <em>\u30bd\u30d5\u30c8\u30d5\u30a7\u30a4\u30eb<\/em> \u6216\u3044\u306f <em>\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb<\/em>\u79c1\u306fSPF\u30e1\u30ab\u30cb\u30ba\u30e0\u3001DKIM\u30bb\u30ec\u30af\u30bf\u3001envelope-from\uff08\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\uff09\u304cFrom:\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u3002\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3092\u4f7f\u3046\u5834\u5408\u306f\u3001DMARC\u306e\u7d50\u679c\u3092\u76e3\u8996\u3057\u3066\u3044\u308b\u3002DKIM\u306f\u901a\u5e38\u3053\u308c\u3092\u88dc\u3046\u3002 <code>~\u3059\u3079\u3066<\/code> \u6c38\u7d9a\u7684\u306b\u3001\u305d\u3057\u3066\u751f\u7523\u7684\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306e\u305f\u3081\u306b\u4e00\u8cab\u3057\u3066\u4f9d\u5b58\u3057\u3066\u3044\u308b\u3002 <strong>-\u305c\u3093\u3076<\/strong>.<\/p>\n\n<h2>DMARC\u30bf\u30b0\u3068\u5024 - \u30b3\u30f3\u30d1\u30af\u30c8\u306a\u8868<\/h2>\n\n<p>\u79c1\u306f\u6b21\u306e\u3088\u3046\u306a\u6982\u8981\u3092\u4f7f\u3063\u3066\u3044\u308b\u3002 <strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u8fc5\u901f\u304b\u3064\u78ba\u5b9f\u306b\u3001\u305d\u3057\u3066\u8aa4\u89e3\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3002\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u3068\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3067\u5024\u3092\u4e00\u8cab\u3055\u305b\u3001\u5909\u66f4\u3092\u8ffd\u8de1\u53ef\u80fd\u306a\u65b9\u6cd5\u3067\u6587\u66f8\u5316\u3059\u308b\u3002\u751f\u7523\u6027\u306e\u9ad8\u3044\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u53b3\u683c\u306a\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u3001\u5e38\u306b\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u308b\u3002\u30d5\u30a9\u30ec\u30f3\u30b8\u30c3\u30af\u30fb\u30ec\u30dd\u30fc\u30c8(<code>\u30b3\u30fc\u30eb<\/code>\u79c1\u306f\u30c7\u30fc\u30bf\u4fdd\u8b77\u898f\u5247\u3092\u9075\u5b88\u3057\u3066\u8a08\u753b\u3092\u7acb\u3066\u3066\u3044\u307e\u3059\u3002\u660e\u78ba\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067 <strong>\u8a55\u5224<\/strong> \u30c9\u30e1\u30a4\u30f3\u306e<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u65e5<\/th>\n      <th>\u610f\u5473<\/th>\n      <th>\u53ef\u80fd\u306a\u5024<\/th>\n      <th>\u63a8\u85a6<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td><strong>p<\/strong><\/td>\n      <td>\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u306e\u30dd\u30ea\u30b7\u30fc<\/td>\n      <td>\u306a\u3057\u3001\u9694\u96e2\u3001\u62d2\u5426<\/td>\n      <td>\u4f55\u3082\u306a\u3044\u3068\u3053\u308d\u304b\u3089\u59cb\u3081\u3001\u6b21\u306b\u62d2\u5426\u3059\u308b\u6570\u3092\u5897\u3084\u3059<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>sp<\/strong><\/td>\n      <td>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306e\u30dd\u30ea\u30b7\u30fc<\/td>\n      <td>\u306a\u3057\u3001\u9694\u96e2\u3001\u62d2\u5426<\/td>\n      <td>\u751f\u7523\u7684\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306b\u306fsp=reject<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30eb\u30a2<\/strong><\/td>\n      <td>\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8<\/td>\n      <td>mailto:adresse<\/td>\n      <td>\u81ea\u5206\u306e\u5831\u544a\u7528\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u7528\u3059\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30b3\u30fc\u30eb<\/strong><\/td>\n      <td>\u79d1\u5b66\u635c\u67fb\u5831\u544a\u66f8<\/td>\n      <td>mailto:adresse<\/td>\n      <td>\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u4f5c\u52d5\u3055\u305b\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30a2\u30c9\u30ad\u30e0<\/strong><\/td>\n      <td>DKIM\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/td>\n      <td>r\uff08\u30ea\u30e9\u30c3\u30af\u30b9\uff09\u3001s\uff08\u53b3\u683c\uff09<\/td>\n      <td>adkim=s\u3067\u660e\u78ba\u306a\u5272\u308a\u5f53\u3066<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30a2\u30b9\u30d7<\/strong><\/td>\n      <td>SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/td>\n      <td>r\uff08\u30ea\u30e9\u30c3\u30af\u30b9\uff09\u3001s\uff08\u53b3\u683c\uff09<\/td>\n      <td>\u8aa4\u5831\u3092\u6e1b\u3089\u3059aspf=s<\/td>\n    <\/tr>\n    <tr>\n      <td><strong>\u30d1\u30fc\u30bb\u30f3\u30c8<\/strong><\/td>\n      <td>\u5fdc\u52df\u306e\u5272\u5408<\/td>\n      <td>0-100<\/td>\n      <td>pct\u306b\u3088\u308b\u6bb5\u968e\u7684\u306a\u5f15\u304d\u7de0\u3081<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\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\/plesk-email-sicherheit-einrichten-6283.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u5916\u90e8\u9001\u4fe1\u8005\u306e\u7d71\u5408Microsoft 365\u3001Google\u3001\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30b5\u30fc\u30d3\u30b9<\/h2>\n\n<p>\u30c9\u30e1\u30a4\u30f3\u304c\u8ffd\u52a0\u306e\u914d\u9001\u7d4c\u8def\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u79c1\u306f\u4ee5\u4e0b\u306eSPF\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002 <strong>\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8<\/strong> 365\u3001Google Workspace\u3001Mailgun\u3001SendGrid\u3001\u307e\u305f\u306f\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30c4\u30fc\u30eb\u306f\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3068\u304a\u308a\u306b\u4f7f\u7528\u3059\u308b\u3002\u5404\u30b5\u30fc\u30d3\u30b9\u306b\u3064\u3044\u3066\u3001\u5225\u306eDKIM\u30ad\u30fc\u304c\u6709\u52b9\u304b\u3069\u3046\u304b\u3001\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u304c\u672c\u5f53\u306b\u7f72\u540d\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u91cd\u8907\u3084\u591a\u3059\u304e\u308b\u7f72\u540d\u306f\u907f\u3051\u308b <strong>\u542b\u3080<\/strong>-SPF\u306eDNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306f10\u56de\u306b\u5236\u9650\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3060\u3002\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u4e88\u7b97\u304c\u8db3\u308a\u306a\u3044\u5834\u5408\u306f\u3001\u9001\u4fe1\u8005\u3092\u7d71\u5408\u3057\u305f\u308a\u3001\u500b\u3005\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u72ec\u81ea\u306eDMARC\u30dd\u30ea\u30b7\u30fc\u3092\u6301\u3064\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u79fb\u52d5\u3055\u305b\u305f\u308a\u3057\u3066\u3044\u308b\u3002\u3053\u3046\u3057\u3066SPF\u306e\u7121\u99c4\u3092\u7701\u304d\u3001DMARC\u306e\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3057\u3066\u3044\u308b\u3002 <strong>\u7f72\u540d<\/strong> \u3088\u308a\u3002<\/p>\n\n<h2>\u7dbf\u5bc6\u306a\u30c1\u30a7\u30c3\u30af\u3068\u30b5\u30fc\u30d0\u30fc\u9078\u5b9a<\/h2>\n\n<p>\u53d7\u4fe1\u30e1\u30fc\u30eb\u306b\u3064\u3044\u3066\u306f <strong>\u30d7\u30ec\u30b9\u30af<\/strong> SPF\u3001DKIM\u3001DMARC\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u65e9\u3044\u6bb5\u968e\u3067\u30b9\u30d1\u30e0\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002Linux\u3067\u306f\u3053\u308c\u3089\u306e\u30c1\u30a7\u30c3\u30af\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u5229\u7528\u3067\u304d\u3001Windows\u3067\u306fSmarterMail\u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u3002\u7f72\u540d\u30eb\u30fc\u30c1\u30f3\u3068\u30d1\u30fc\u30b5\u30fc\u304c\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u305f\u308c\u308b\u3088\u3046\u306b\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u9069\u5207\u306b\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\u507d\u967d\u6027\u306e\u554f\u984c\u304c\u3042\u308c\u3070\u3001\u30b9\u30b3\u30a2\u30ea\u30f3\u30b0\u306e\u3057\u304d\u3044\u5024\u3092\u8abf\u6574\u3059\u308b\u304c\u3001\u6c7a\u3057\u3066 <strong>\u65b9\u91dd<\/strong> \u81ea\u5206\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u3082\u306e\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u79c1\u306f\u9ad8\u3044\u4fdd\u8b77\u7387\u3092\u7dad\u6301\u3057\u3001\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u304b\u3089\u306e\u914d\u4fe1\u3092\u4fdd\u8a3c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2025\/09\/plesk-konfiguration-office-9284.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u8fc5\u901f\u306a\u89e3\u6c7a\u7b56<\/h2>\n\n<p>\u30df\u30fc\u30c4 \"<strong>SPF<\/strong> permerror \"\u306e\u5834\u5408\u3001\u901a\u5e38\u306f\u69cb\u6587\u30a8\u30e9\u30fc\u304b\u3001\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u4e0a\u9650\u3092\u8d85\u3048\u3066\u3044\u308b\u3002DKIM\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u306f\u3001\u30bb\u30ec\u30af\u30bf\u3001\u516c\u958b\u9375\u30ec\u30b3\u30fc\u30c9\u3001\u304a\u3088\u3073TXT\u5024\u306e\u7d42\u7aef\u304c\u6b63\u3057\u3044\u9006\u30ab\u30f3\u30de\u3067\u7d42\u308f\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002DMARC\u304c\u5931\u6557\u3057\u305f\u5834\u5408 <code>\u5931\u6557<\/code>\u307e\u305a\u3001From-Domain\u3001Return-Path\u3001DKIM-d=\u304c\u5b8c\u5168\u306b\u4e00\u81f4\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002SPF\u304c\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3067\u58ca\u308c\u308b\u5834\u5408\u306f <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u305d\u3057\u3066\u7f72\u540d\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u5b89\u5b9a\u3055\u305b\u308b\u3002\u79c1\u306f\u3053\u306e\u9806\u5e8f\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u914d\u9001\u306b\u95a2\u3059\u308b\u307b\u3068\u3093\u3069\u306e\u554f\u984c\u3092\u3001\u9577\u3044\u6642\u9593\u3092\u304b\u3051\u3066\u691c\u7d22\u3059\u308b\u3053\u3068\u306a\u304f\u89e3\u6c7a\u3057\u3066\u3044\u308b\u3002<\/p>\n\n<h2>Plesk\u306eDNS\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3068\u81ea\u52d5\u5316<\/h2>\n\n<p>\u591a\u304f\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u7ba1\u7406\u3059\u308b\u5834\u5408\u306f <strong>DNS\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8<\/strong> \u3092Plesk\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3001SPF\u3001DKIM\u3001DMARC\u306e\u6a19\u6e96\u30ec\u30b3\u30fc\u30c9\u3092\u4fdd\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u65b0\u3057\u3044\u30c9\u30e1\u30a4\u30f3\u306f\u3059\u3050\u306b\u5f37\u56fa\u306a\u30c7\u30d5\u30a9\u30eb\u30c8\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u79c1\u306f\u305d\u308c\u3092\u5fae\u8abf\u6574\u3059\u308b\u3060\u3051\u3067\u3088\u3044\u306e\u3067\u3059\u3002\u307e\u305f\u3001\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3068\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u30c9\u30e1\u30a4\u30f3\u5168\u4f53\u3067\u3088\u308a\u53b3\u683c\u306aDMARC\u306a\u3069\u306e\u8a08\u753b\u7684\u306a\u5909\u66f4\u3082\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002DKIM\u30ad\u30fc\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u6bb5\u968e\u7684\u306b\u5909\u66f4\u3067\u304d\u308b\u3088\u3046\u306b2\u3064\u306e\u30bb\u30ec\u30af\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u6570\u5341\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u4e00\u8cab\u3057\u305f\u904b\u7528\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u7dad\u6301\u53ef\u80fd<\/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\/2025\/09\/plesk_spf_dkim_dmarc_setup_8947.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>DMARC\u30ec\u30dd\u30fc\u30c8\u306e\u8a55\u4fa1\u3068\u30dd\u30ea\u30b7\u30fc\u306e\u5f37\u5316<\/h2>\n\n<p>\u672c\u756a\u7a3c\u52d5\u5f8c\u3001\u79c1\u306f\u6bce\u65e5\u306e\u3088\u3046\u306b\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u3092\u5206\u6790\u3057\u3001\u6b21\u306e\u3088\u3046\u306a\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u308b\u3002 <strong>\u60c5\u5831\u6e90<\/strong>\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u7121\u8a31\u53ef\u3067\u9001\u4fe1\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u79c1\u306f\u3001\u30dd\u30ea\u30b7\u30fc\u3092\u5f37\u5316\u3059\u308b\u524d\u306b\u3001\u4e88\u671f\u3057\u306a\u3044IP\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3001\u53e4\u304f\u306a\u3063\u305f\u30c4\u30fc\u30eb\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3057\u307e\u3059\u3002\u304b\u3089\u306e\u5909\u66f4 <code>p=\u306a\u3057<\/code> \u306b\u65bc\u3044\u3066 <code>\u9694\u96e2<\/code> \u305d\u3057\u3066\u5f8c\u306b <code>\u62d2\u3080<\/code> \u79c1\u306f\u3001\u6b21\u306e\u3053\u3068\u3092\u5b9f\u884c\u3059\u308b\u3002 <code>\u30d1\u30fc\u30bb\u30f3\u30c8<\/code> \u6bb5\u968e\u3092\u8e0f\u3093\u3067\u3001\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3055\u308c\u305f\u65b9\u6cd5\u3067\u52b9\u679c\u3092\u6e2c\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u305f\u3002\u5931\u6557\u3057\u305f\u30ec\u30dd\u30fc\u30c8\u306b\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u304c\u8868\u793a\u3055\u308c\u305f\u5834\u5408\u3001\u79c1\u306fSPF\u3092\u4fee\u6b63\u3059\u308b\u304b\u3001\u72ec\u81ea\u306eDKIM\u30ad\u30fc\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u3053\u306e\u30eb\u30fc\u30c1\u30f3\u306f <strong>\u8a55\u5224<\/strong> \u53ef\u8996\u5316\u3055\u308c\u3001\u306a\u308a\u3059\u307e\u3057\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n<h2>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u6b63\u3057\u304f\u7406\u89e3\u3059\u308b<\/h2>\n\n<p>\u3060\u304b\u3089 <strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u79c1\u306f\u4e00\u8cab\u3057\u3066\u6b63\u3057\u3044\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u78ba\u4fdd\u3057\u3066\u3044\u308b\u3002\u305d\u3057\u3066 <strong>SPF<\/strong> \u306f\u3001envelope from (\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9)\u306e\u30c9\u30e1\u30a4\u30f3\u3001\u307e\u305f\u306fHELO\/EHLO ID\u3067\u3042\u308a\u3001\u53ef\u8996\u306efrom\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044(strict: \u540c\u4e00\u3001relaxed: \u540c\u3058\u7d44\u7e54\u306e\u30c9\u30e1\u30a4\u30f3)\u3002\u3068\u306f <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <code>d=<\/code>-\u7f72\u540d\u306e\u5c5e\u6027\uff1a\u540c\u4e00\u30c9\u30e1\u30a4\u30f3\uff08strict\uff09\u307e\u305f\u306f\u540c\u4e00\u7d44\u7e54\u30c9\u30e1\u30a4\u30f3\uff08relax\uff09\u3092\u6307\u3059\u3053\u3068\u3002\u5b9f\u969b\u306b\u306f\u3001\u6b21\u306e\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\uff1a<\/p>\n<ul>\n  <li>\u4f7f\u7528\u3055\u308c\u308b\u30d0\u30a6\u30f3\u30b9\u30d1\u30b9\uff08\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\uff09\u304cfrom\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\u3001\u72ec\u81ea\u306eDMARC\u30dd\u30ea\u30b7\u30fc\u3092\u6301\u3064\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u610f\u56f3\u7684\u306b\u30a2\u30a6\u30c8\u30bd\u30fc\u30b9\u3055\u308c\u3066\u3044\u308b\u3001<\/li>\n  <li>\u3059\u3079\u3066\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30d7\u30ed\u30d0\u30a4\u30c0\u306eFrom\u30c9\u30e1\u30a4\u30f3 <em>\u30b5\u30a4\u30f3<\/em> (DKIM)\u3067\u3042\u308b\u3001<\/li>\n  <li>DKIM\u7f72\u540d\u306f\u3001SPF\u306e\u7834\u58ca\u3092\u88dc\u3046\u305f\u3081\u306b\u3001\u8ee2\u9001\u4e2d\u3082\u305d\u306e\u307e\u307e\u6b8b\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u6b20\u843d\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u6709\u52b9\u306aSPF\/DKIM\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001DMARC\u53d7\u4fe1\u8005\u306f\u30a8\u30e9\u30fc\u3092\u5831\u544a\u3059\u308b\u3002 <code>dmarc=\u5931\u6557<\/code>.\u3060\u304b\u3089\u3001\u79c1\u306f\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u30d8\u30c3\u30c0\u30fc\u306b\u3042\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306e\u3060\u3002 <code>\u8a8d\u8a3c\u7d50\u679c<\/code>, <code>\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9<\/code> \u3068DKIM\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6bd4\u8f03\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001SPF\u3068DKIM\u306e\u3069\u3061\u3089\u304c\u6574\u5408\u6027\u304c\u3068\u308c\u3066\u3044\u3066\u3001\u3069\u3053\u3092\u6539\u5584\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u304c\u3059\u3050\u306b\u308f\u304b\u308b\u3002<\/p>\n\n<h2>\u9375\u7ba1\u7406\u3068DNS\u30d1\u30e9\u30e1\u30fc\u30bf<\/h2>\n\n<p>\u5805\u7262\u306a <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>-\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u306f\u30012048\u30d3\u30c3\u30c8\u306e\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u305f\u3002\u3067 <strong>\u30d7\u30ec\u30b9\u30af<\/strong> \u79c1\u306f\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306b\u30ad\u30fc\u306e\u9577\u3055\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u79c1\u306f\u53e4\u30441024\u30d3\u30c3\u30c8\u306e\u30ad\u30fc\u3092\u901f\u3084\u304b\u306b\u4e0a\u3052\u308b\u3002\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u9577\u3044DKIM TXT\u30ec\u30b3\u30fc\u30c9\u3092\u3044\u304f\u3064\u304b\u306e\u9006\u30ab\u30f3\u30de\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u5206\u5272\u3057\u3001DNS\u30b5\u30fc\u30d0\u30fc\u304c\u6b63\u3057\u304f\u914d\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u307e\u305f\u3001\u610f\u5473\u306e\u3042\u308b <strong>TTL<\/strong>-\u5024\uff1a\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u6bb5\u968e\u3067\u306f300\u301c900\u79d2\u3001\u751f\u7523\u7684\u306b\u306f1\u301c4\u6642\u9593\u3092\u4f7f\u3046\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u8ca0\u8377\u3092\u304b\u3051\u308b\u3053\u3068\u306a\u304f\u3001\u5909\u66f4\u306b\u67d4\u8edf\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3002<\/p>\n<p>\u4edd <strong>\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong> \u79c1\u306f\u3053\u308c\u30922\u3064\u306e\u30bb\u30ec\u30af\u30bf\u3067\u5931\u6557\u306a\u304f\u3084\u3063\u3066\u3044\u308b\uff1a<\/p>\n<ol>\n  <li>Plesk\u3067\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u4f5c\u6210\u3057\u3001\u516c\u958b\u9375\u3092DNS\u3067TXT\u3068\u3057\u3066\u516c\u958b\u3057\u307e\u3059\u3002<\/li>\n  <li>\u9001\u4fe1\u8005\u3092\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf\u306b\u5909\u66f4\u3057\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\uff08\u30d8\u30c3\u30c0\u306e\u8868\u793a\uff09\u3092\u89b3\u5bdf\u3059\u308b\u3002 <code>s=\u65b0\u3057\u3044\u30bb\u30ec\u30af\u30bf<\/code>).<\/li>\n  <li>\u3059\u3079\u3066\u306e\u30d5\u30ed\u30fc\u304c\u5909\u63db\u3055\u308c\u305f\u3089\u3001DNS\u306e\u53e4\u3044\u30bb\u30ec\u30af\u30bf\u3092\u524a\u9664\u3057\u3001Plesk\u3067\u7121\u52b9\u306b\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u79c1\u306f\u53ef\u80fd\u306a\u9650\u308a\u3001\u7b2c\u4e09\u8005\u306e\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u3001 <em>\u59d4\u4efb\u7d71\u6cbb<\/em> DKIM\u30ec\u30b3\u30fc\u30c9(\u4f8b\u3048\u3070\u30d7\u30ed\u30d0\u30a4\u30c0\u30bb\u30ec\u30af\u30bf\u3078\u306eCNAME)\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u79c1\u306f\u81ea\u5206\u306e\u30be\u30fc\u30f3\u306e\u5236\u5fa1\u3092\u7dad\u6301\u3057\u3001\u904b\u7528\u4e2d\u65ad\u306e\u30ea\u30b9\u30af\u3092\u5192\u3059\u3053\u3068\u306a\u304f\u30ad\u30fc\u3092\u56de\u8ee2\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n<h2>\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u8ee2\u9001\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4<\/h2>\n\n<p>\u5b9f\u969b\u306e\u74b0\u5883\u3067\u306f\u3001\u30e1\u30fc\u30eb\u3092\u66f8\u304d\u63db\u3048\u308b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3084\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3092\u5b9a\u671f\u7684\u306b\u898b\u304b\u3051\u308b\u3002\u79c1\u306f\u7279\u306b\u3053\u306e\u52b9\u679c\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li><strong>\u8ee2\u9001<\/strong>\u8ee2\u9001\u5148IP\u304c\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u306eSPF\u306b\u306a\u3044\u305f\u3081\u3001SPF\u306f\u3057\u3070\u3057\u3070\u58ca\u308c\u308b\u3002\u79c1\u306f\u3053\u3053\u3067 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>\u3053\u308c\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u4fdd\u8b77\u3092\u63d0\u4f9b\u3059\u308b\u3002\u7f72\u540d\u304c\u5909\u66f4\u3055\u308c\u306a\u3044\u5834\u5408\u3001DKIM\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u4ecb\u3057\u3066DMARC\u304c\u5b58\u5728\u3059\u308b\u3002<\/li>\n  <li><strong>\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8<\/strong>\u591a\u304f\u306e\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306f\u30b5\u30d6\u30b8\u30a7\u30af\u30c8\u3084\u30d5\u30c3\u30bf\u30fc\u3092\u5909\u66f4\u3059\u308b\u305f\u3081\u3001DKIM\u7f72\u540d\u304c\u58ca\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u79c1\u306f\u30ea\u30e9\u30c3\u30af\u30b9\u3057\u305f\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8a08\u753b\u3057\u3001\u30ea\u30b9\u30c8\u304cSRS\/ARC\u307e\u305f\u306f\u72ec\u81ea\u306e\u7f72\u540d\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u53ef\u80fd\u3067\u3042\u308c\u3070\u3001\u30ea\u30b9\u30c8\u306b\u306f\u72ec\u81ea\u306eDMARC\u30dd\u30ea\u30b7\u30fc\u3092\u6301\u3064\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u3044\u307e\u3059\u3002<\/li>\n  <li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4<\/strong>\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u518d\u7f72\u540d\u3057\u305f\u308aenvelope-from\u3092\u66f8\u304d\u63db\u3048\u305f\u308a\u3059\u308b\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306f\u3001\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3068\u6b63\u3057\u304f\u6574\u5408\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u79c1\u306f\u305d\u306e\u5f79\u5272\u3092\u6587\u66f8\u5316\u3057\u3001SPF\uff08ip4\/ip6\uff09\u307e\u305f\u306f\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3067\u30a2\u30f3\u30ab\u30fc\u3092\u4ed8\u3051\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u7dad\u6301\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<p>\u3068\u306e\u30e1\u30fc\u30eb\u306e\u3084\u308a\u53d6\u308a <code>spf=\u5931\u6557<\/code> \u30d5\u30a9\u30ef\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u7d4c\u7531\u3059\u308b\u9650\u308a\u3001\u81ea\u52d5\u7684\u306b\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306b\u306a\u308b\u3053\u3068\u306f\u306a\u3044\u3002 <code>dkim=\u30d1\u30b9<\/code> \u304c\u5b58\u5728\u3057\u3001DKIM\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u6b63\u3057\u3044\u3002\u500b\u3005\u306e\u30b7\u30b0\u30ca\u30eb\u3092\u500b\u5225\u306b\u8a55\u4fa1\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8a8d\u8a3c\u7d50\u679c\u5168\u4f53\u3092\u8a55\u4fa1\u3059\u308b\u3002<\/p>\n\n<h2>\u5171\u6709IP\u3001HELO\/EHLO\u3001rDNS<\/h2>\n\n<p>\u8907\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u540c\u3058\u767a\u4fe1IP\u3092\u5171\u6709\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u79c1\u306f\u30af\u30ea\u30fc\u30f3\u306aIP\u306b\u983c\u3063\u3066\u3044\u308b\u3002 <strong>rDNS<\/strong> \u304a\u3088\u3073\u4e00\u8cab\u3057\u305fHELO\/EHLO\u540d\u3092\u6307\u3059\u3002\u9006\u30dd\u30a4\u30f3\u30bf\u306fFQDN\u3092\u6307\u3059\uff08\u305f\u3068\u3048\u3070 <em>mail.hosting-example.tld<\/em>)\u3001\u305d\u306eA\u30ec\u30b3\u30fc\u30c9\u306f\u540c\u3058IP\u3092\u6307\u3057\u3066\u3044\u308b\u3002MTA\u306f\u307e\u3055\u306b\u3053\u306e\u540d\u524d\u3067\u5831\u544a\u3059\u308b\u3002\u79c1\u306f <strong>SMTP TLS\u8a3c\u660e\u66f8<\/strong> \u306f\u3001HELO\u540d\uff08\u8907\u6570\u306e\u540d\u524d\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306fSNI\uff09\u3068\u4e00\u81f4\u3057\u307e\u3059\u3002\u5404\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u3001SPF\/DKIM\/DMARC\u304c\u5b8c\u5168\u304b\u3064\u6b63\u3057\u304f\u6574\u5408\u3057\u3066\u3044\u308b\u3053\u3068\u3082\u78ba\u8a8d\u3059\u308b\u3002\u8a8d\u8a3c\u304c\u6709\u52b9\u3067\u3042\u308b\u9650\u308a\u3001\u5171\u6709IP\u3060\u3051\u3067\u306fDMARC\u306b\u306f\u5f71\u97ff\u3057\u306a\u3044\u3002<\/p>\n<p>\u5c02\u7528\u306e\u9001\u4fe1\u8005\uff08\u4f8b\uff1a\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3068\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u30e1\u30fc\u30eb\uff09\u306b\u3064\u3044\u3066\u306f\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3068\u3001\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u72ec\u81ea\u306eIP\u3067\u5206\u3051\u305f\u3044\u3002\u3053\u308c\u306f <strong>\u8a55\u5224\u7ba1\u7406<\/strong>\u306f\u3001DMARC\u30ec\u30dd\u30fc\u30c8\u306e\u8a55\u4fa1\u3092\u7c21\u7d20\u5316\u3057\u3001\u76f8\u4e92\u5e72\u6e09\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u307e\u3059\u3002<\/p>\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3068\u5c55\u958b\u306e\u5b9f\u969b<\/h2>\n\n<p>\u30b9\u30e0\u30fc\u30ba\u306a\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u3001\u79c1\u306f\u7d99\u7d9a\u7684\u306a <strong>DMARC\u5206\u6790<\/strong> \u660e\u78ba\u306a\u5c55\u958b\u30b9\u30c6\u30c3\u30d7\u3068\u3068\u3082\u306b\uff1a<\/p>\n<ul>\n  <li><strong>\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3<\/strong>2\uff5e4\u9031\u9593 <code>p=\u306a\u3057<\/code>\u3059\u3079\u3066\u306e\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\uff08\u30eb\u30a2\uff09\u3092\u53ce\u96c6\u3057\u3001\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3092\u7279\u5b9a\u3059\u308b\u3002<\/li>\n  <li><strong>\u5f8c\u7247\u4ed8\u3051<\/strong>\u672a\u627f\u8a8d\u306e\u9001\u4fe1\u8005\u3092\u524a\u9664\u3057\u3001SPF\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3057\u3001\u3059\u3079\u3066\u306e\u6b63\u898f\u30b7\u30b9\u30c6\u30e0\u3067DKIM\u3092\u6709\u52b9\u306b\u3059\u308b\u3002<\/li>\n  <li><strong>\u30c9\u30ec\u30c3\u30b7\u30f3\u30b0<\/strong>\u3068 <code>\u30d1\u30fc\u30bb\u30f3\u30c8<\/code> \u5f90\u3005\u306b <code>\u9694\u96e2<\/code>\u5f8c\u306b <code>\u62d2\u3080<\/code> \u3092\u5897\u3084\u3057\u3001\u305d\u306e\u52b9\u679c\u3092\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u3067\u6e2c\u5b9a\u3059\u308b\u3002<\/li>\n  <li><strong>\u6ce8\u610f\u559a\u8d77<\/strong>\u3057\u304d\u3044\u5024\uff08\u65b0\u898fIP\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3054\u3068\u306e\u5931\u6557\u7387\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u65b0\u898f\uff09\u3092\u5b9a\u7fa9\u3057\u3001\u901a\u77e5\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/li>\n  <li><strong>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong>\u30bb\u30ec\u30af\u30bf\u3001TTL\u3001\u30ad\u30fc\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u3001SPF\u4e88\u7b97\u3001\u8cac\u4efb\u3092\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u4e0b\u306b\u7f6e\u304f\u3002<\/li>\n<\/ul>\n<p>\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>SPF\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u4e88\u7b97<\/strong> (DNS\u30af\u30a8\u30ea\u3067\u6700\u592710\u30e1\u30ab\u30cb\u30ba\u30e0)\u3092\u542b\u307f\u3001\u7d71\u5408\u3059\u308b\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u91cd\u8981\u306a\u30e1\u30ab\u30cb\u30ba\u30e0 <code>\u30d4\u30fc\u30c6\u30a3\u30fc\u30a2\u30fc\u30eb<\/code> \u6216\u3044\u306f <code>+\u3059\u3079\u3066<\/code> \u79c1\u306f\u901a\u5e38\u3001\u4f7f\u7528\u3057\u306a\u3044\uff1b <code>\u30a2\u30a4\u30d4\u30fc\u30d5\u30a9\u30fc<\/code>\/<code>\u30a2\u30a4\u30d4\u30fc\u30ed\u30af<\/code>, <code>a<\/code>, <code>\u30a8\u30e0\u30a8\u30c3\u30af\u30b9<\/code> \u3068\u30bf\u30fc\u30b2\u30c3\u30c8 <code>\u542b\u3080<\/code> \u304c\u9078\u629e\u306e\u624b\u6bb5\u3067\u3042\u308b\u3053\u3068\u306b\u5909\u308f\u308a\u306f\u306a\u3044\u3002\u3053\u308c\u304c\u3001\u79c1\u304c\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3092\u5b89\u5b9a\u3055\u305b\u3001\u76e3\u67fb\u53ef\u80fd\u306a\u72b6\u614b\u306b\u4fdd\u3064\u65b9\u6cd5\u3067\u3042\u308b\u3002<\/p>\n\n<h2>\u5404\u30c9\u30e1\u30a4\u30f3\u306e\u30af\u30a4\u30c3\u30af\u30c1\u30a7\u30c3\u30af<\/h2>\n\n<p>\u5404\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306e\u6700\u5f8c\u306b\u3001\u79c1\u306f\u56fa\u5b9a\u3055\u308c\u305f <strong>\u30c1\u30a7\u30c3\u30af<\/strong> \u3092\u901a\u3057\u3066\uff1aSPF\u30ec\u30b3\u30fc\u30c9\u304c\u5229\u7528\u53ef\u80fd\u3067\u3001\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u4e88\u7b97\u304c10\u4ee5\u4e0b\u3001\u30e1\u30ab\u30cb\u30ba\u30e0\u304c\u6b63\u3057\u304f\u30bd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u3001 <code>-\u305c\u3093\u3076<\/code> \u30a2\u30af\u30c6\u30a3\u30d6\u3002DKIM\u7f72\u540d\u304c\u6709\u52b9\u3067\u3001\u30bb\u30ec\u30af\u30bf\u304c\u6587\u66f8\u5316\u3055\u308c\u3001\u30ad\u30fc\u306e\u9577\u3055\u304c\u5341\u5206\u3067\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u8a08\u753b\u3055\u308c\u3066\u3044\u308b\u3002\u6709\u52b9\u306aTXT\u30ec\u30b3\u30fc\u30c9\u3092\u6301\u3064DMARC\u3001\u53b3\u683c\u306a\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3001\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u30a2\u30fc\u30ab\u30a4\u30d6\u3055\u308c\u305f\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3092\u5831\u544a\u3002\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u306e\u8868\u793a <code>spf=\u30d1\u30b9<\/code>, <code>dkim=\u30d1\u30b9<\/code> \u305d\u3057\u3066 <code>dmarc=pass<\/code> 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<strong>\u898f\u683c<\/strong>SPF\u306b\u7121\u99c4\u3092\u306a\u304f\u3057\u3001\u5404\u9001\u4fe1\u8005\u306eDKIM\u3092\u6709\u52b9\u5316\u3057\u3001DMARC\u3092\u30ec\u30dd\u30fc\u30c6\u30a3\u30f3\u30b0\u4ed8\u304d\u3067\u5c55\u958b\u3059\u308b\u3002\u305d\u306e\u5f8c\u30012\u9031\u9593\u304b\u30894\u9031\u9593\u304b\u3051\u3066\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3057\u3001\u76f2\u70b9\u3092\u3064\u3076\u3057\u3066\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u5f37\u5316\u3059\u308b\u3002\u5916\u90e8\u30b5\u30fc\u30d3\u30b9\u3092\u7ba1\u7406\u3055\u308c\u305f\u65b9\u6cd5\u3067\u7d71\u5408\u3057\u3001\u305d\u306e\u5185\u5bb9\u3092\u6587\u66f8\u5316\u3057\u3001\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u4e88\u7b97\u3092\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002\u8907\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u306bDNS\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u3001\u7f72\u540d\u3092\u65b0\u9bae\u306b\u4fdd\u3064\u305f\u3081\u306bDKIM\u30ad\u30fc\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8a08\u753b\u3059\u308b\u3002\u6709\u7528\u306a\u5b9f\u8df5\u7684\u30a2\u30a4\u30c7\u30a2\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30d2\u30f3\u30c8\u306f\u3001\u79c1\u306e 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