{"id":14079,"date":"2025-11-04T10:00:00","date_gmt":"2025-11-04T01:00:00","guid":{"rendered":"https:\/\/www.kagoya.jp\/howto\/?p=14079"},"modified":"2025-11-17T18:03:34","modified_gmt":"2025-11-17T09:03:34","slug":"arc","status":"publish","type":"post","link":"https:\/\/www.kagoya.jp\/howto\/it-glossary\/mail\/arc\/","title":{"rendered":"\u30e1\u30fc\u30eb\u306eARC\u3068\u306f\uff1f\u8a8d\u8a3c\u5931\u6557\u3092\u9632\u304e\u4fe1\u983c\u6027\u3092\u9ad8\u3081\u308b\u7406\u7531\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/mailarc.png\" alt=\"\u30e1\u30fc\u30eb\u306eARC\u6a5f\u80fd\u89e3\u8aac\" class=\"wp-image-14879\"\/><\/figure>\n\n\n\n<p>\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306b\u3088\u308b\u88ab\u5bb3\u306f\u62e1\u5927\u3059\u308b\u3070\u304b\u308a\u3067\u3001\u305d\u306e\u5bfe\u7b56\u306e\u5fc5\u8981\u6027\u3082\u5897\u3057\u3066\u3044\u308b\u72b6\u6cc1\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5f93\u6765\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\uff08SPF\/DKIM\/DMARC\uff09\u306f\u3001\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u5bfe\u7b56\u3068\u3057\u3066\u4e00\u5b9a\u306e\u6210\u679c\u3092\u3042\u3052\u3066\u3044\u307e\u3059\u3002\u3051\u308c\u3069\u4ee5\u524d\u304b\u3089\u6307\u6458\u3055\u308c\u3066\u3044\u308b\u554f\u984c\u70b9\u306b\u3088\u308a\u3001\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u5bfe\u7b56\u3068\u3057\u3066\u5341\u5206\u3068\u306f\u3044\u3048\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>ARC\u306fSPF\/DKIM\/DMARC\u306e\u554f\u984c\u70b9\u3092\u89e3\u6d88\u3059\u308b\u3053\u3068\u3092\u671f\u5f85\u3055\u308c\u3066\u3044\u308b\u6280\u8853\u3067\u3059\u3002\u307e\u3060\u5e83\u304f\u666e\u53ca\u306f\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u4eca\u5f8c\u3055\u3089\u306b\u6ce8\u76ee\u3055\u308c\u308b\u3067\u3057\u3087\u3046\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306fARC\u306f\u4f55\u304b\u3084\u305d\u306e\u4ed5\u7d44\u307f\u3001\u5f93\u6765\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u6280\u8853\u3068\u4f55\u304c\u9055\u3046\u304b\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070ARC\u306e\u6982\u8981\u3084\u6ce8\u76ee\u3055\u308c\u308b\u7406\u7531\u3092\u7406\u89e3\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n<div class=\"kh-cta\"><div class=\"entry-content\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full has-lightbox\"><a href=\"https:\/\/www.kagoya.jp\/document\/form-mailsecurity-check\/?argument=vqHX23Xs&amp;dmai=a658cdc89bf06c\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"728\" height=\"90\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/c0d5f3c905ab8673bd3286aaef85b3d7.png\" alt=\"\" class=\"wp-image-14327\" srcset=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/c0d5f3c905ab8673bd3286aaef85b3d7.png 728w, https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/c0d5f3c905ab8673bd3286aaef85b3d7-300x37.png 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n<\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">ARC\u3068\u306f | \u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\u306b\u5c4a\u304f\u307e\u3067\u8a8d\u8a3c\u60c5\u5831\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30c8\u30b3\u30eb<\/h2>\n\n\n\n<p>ARC\uff08Authenticated Received Chain\uff09\u3068\u306f\u3001\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u5148\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u5c4a\u304f\u307e\u3067\u8a8d\u8a3c\u60c5\u5831\u3092\u7dad\u6301\u3057\u3001\u6b63\u3057\u304f\u8a55\u4fa1\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002ARC\u3092\u4f7f\u3046\u3053\u3068\u3067\u9001\u4fe1\u5148\u304c\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3092\u9069\u5207\u306b\u304a\u3053\u306a\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>ARC\u306f2019\u5e747\u6708\u306b\u3001RFC8617\u306b\u3066\u300cExperimental\uff08\u5b9f\u9a13\u7684\uff09\u300d\u306a\u30b9\u30c6\u30fc\u30bf\u30b9\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u4ed5\u69d8\u304c\u516c\u958b\u3055\u308c\u307e\u3057\u305f\u3002\u5b9f\u9a13\u7684\u3068\u3055\u308c\u307e\u3059\u304c\u3001Gmail\u3084Microsoft365\u3092\u306f\u3058\u3081\u4e00\u90e8\u3067\u3059\u3067\u306b\u5229\u7528\u304c\u958b\u59cb\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ARC\u304c\u6ce8\u76ee\u3055\u308c\u3066\u3044\u308b\u7406\u7531<\/h2>\n\n\n\n<p>ARC\u306e\u767b\u5834\u4ee5\u524d\u306b\u3082\u3001SPF\/DKIM\/DMARC\u3068\u3044\u3063\u305f\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u6280\u8853\u304c\u4f7f\u308f\u308c\u3066\u304d\u307e\u3057\u305f\u3002\u305d\u3046\u3057\u305f\u306a\u304b\u3067\u3001\u305d\u308c\u3089\u3088\u308a\u65b0\u3057\u3044\u6280\u8853\u3067\u3042\u308bARC\u306f\u306a\u305c\u6ce8\u76ee\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5f93\u6765\u306e\u8a8d\u8a3c\u6280\u8853\u3067\u306f\u30e1\u30fc\u30eb\u8ee2\u9001\u306a\u3069\u3067\u8a8d\u8a3c\u304c\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u3063\u305f<\/h3>\n\n\n\n<p>SPF\/DKIM\/DMARC\u3068\u3044\u3063\u305f\u8a8d\u8a3c\u6280\u8853\u306f\u3001\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306e\u5bfe\u7b56\u3068\u3057\u3066\u6709\u52b9\u3067\u3059\u304c\u5927\u304d\u306a\u5f31\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3089\u5f93\u6765\u306e\u8a8d\u8a3c\u6280\u8853\u306f\u3001\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u5143\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u76f4\u63a5\u9001\u4fe1\u5148\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u914d\u4fe1\u3055\u308c\u308b\u306e\u3067\u3042\u308c\u3070\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u3084\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u3068\u3044\u3063\u305f\u8a8d\u8a3c\u306b\u5fc5\u8981\u306a\u60c5\u5831\u304b\u3089\u3001\u6b63\u3057\u304f\u8a8d\u8a3c\u3092\u304a\u3053\u306a\u3048\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u30e1\u30fc\u30eb\u8ee2\u9001\u3084\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306b\u3088\u3063\u3066\u3001\u307b\u304b\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u3059\u308b\u3068\u305d\u308c\u3089\u60c5\u5831\u304c\u66f8\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u8a8d\u8a3c\u304c\u5931\u6557\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">ARC\u3067\u3042\u308c\u3070\u30e1\u30fc\u30eb\u8ee2\u9001\u306a\u3069\u304c\u767a\u751f\u3057\u3066\u3082\u8a8d\u8a3c\u306e\u5931\u6557\u3092\u9632\u3052\u308b<\/h3>\n\n\n\n<p>ARC\u3067\u306f\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u5931\u6557\u3092\u9632\u3050\u305f\u3081\u306b\u3001\u5c02\u7528\u306e\u30d8\u30c3\u30c0\u60c5\u5831\u3092\u30e1\u30fc\u30eb\u306b\u8a18\u9332\u3057\u307e\u3059\u3002\u9001\u4fe1\u5143\u3060\u3051\u3067\u306a\u304f\u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\u3082ARC\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u3001\u305d\u306e\u5c02\u7528\u30d8\u30c3\u30c0\u304b\u3089\u6b63\u78ba\u306b\u8a8d\u8a3c\u3092\u304a\u3053\u306a\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30fc\u30eb\u306e\u8ee2\u9001\u3084\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306b\u3088\u3063\u3066\u3001\u9001\u4fe1\u5148\u3078\u30e1\u30fc\u30eb\u304c\u914d\u9001\u3055\u308c\u308b\u30b1\u30fc\u30b9\u3082\u5c11\u306a\u304f\u3042\u308a\u307e\u305b\u3093\u3002ARC\u3092\u4f7f\u3048\u3070\u3053\u3046\u3044\u3063\u305f\u30b1\u30fc\u30b9\u3067\u3082\u3001\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u5931\u6557\u3092\u9632\u3052\u308b\u306e\u3067\u6ce8\u76ee\u3092\u96c6\u3081\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ARC\u3067\u30e1\u30fc\u30eb\u306e\u8a8d\u8a3c\u5931\u6557\u3092\u9632\u3052\u308b\u3068\u4f55\u304c\u3088\u3044\uff1fARC\u5c0e\u5165\u306e\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8<\/h2>\n\n\n\n<p>ARC\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001SPF\/DKIM\/DMARC\u306b\u3088\u308b\u8a8d\u8a3c\u306e\u5931\u6557\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u8a8d\u8a3c\u306e\u5931\u6557\u3092\u4e88\u9632\u3059\u308b\u3053\u3068\u3067\u3069\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u3068\u8aa4\u89e3\u3055\u308c\u306b\u304f\u304f\u306a\u308a\u76f8\u624b\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304d\u3084\u3059\u304f\u306a\u308b<\/h3>\n\n\n\n<p>ARC\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u5931\u6557\u306b\u3088\u3063\u3066\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306a\u3069\u3068\u8aa4\u89e3\u3055\u308c\u8ff7\u60d1\u30e1\u30fc\u30eb\u3068\u5224\u5b9a\u3055\u308c\u308b\u306e\u3092\u9632\u3052\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u306e\u8aa4\u691c\u77e5\u3092\u4e88\u9632\u3057\u76f8\u624b\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304d\u3084\u3059\u304f\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u5f37\u5316\u3055\u308c\u308b<\/h3>\n\n\n\n<p>ARC\u306b\u306f\u30e1\u30fc\u30eb\u8ee2\u9001\u3084\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u3057\u305f\u969b\u306b\u3001\u30e1\u30fc\u30eb\u304c\u6539\u3056\u3093\u3092\u691c\u51fa\u3059\u308b\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081ARC\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305fARC\u306b\u3088\u3063\u3066\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u7cbe\u5ea6\u3092\u3042\u3052\u3089\u308c\u308b\u305f\u3081\u3001\u7d50\u679c\u7684\u306b\u30b9\u30d1\u30e0\u30e1\u30fc\u30eb\u30fb\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30e1\u30fc\u30eb\u3082\u9069\u5207\u306b\u6392\u9664\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u3046\u3044\u3063\u305f\u610f\u5473\u3067\u3082\u3001\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5411\u4e0a\u306b\u5f79\u7acb\u3064\u3068\u3044\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ARC\u306b\u3088\u308b\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e\u6d41\u308c<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"500\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/mailarcimg-1.png\" alt=\"\" class=\"wp-image-14118\" srcset=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/mailarcimg-1.png 1000w, https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/mailarcimg-1-300x150.png 300w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p>ARC\u3092\u7528\u3044\u305f\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u6d41\u308c\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br>\u3053\u3053\u3067\u306f\u9001\u4fe1\u3055\u308c\u305f\u30e1\u30fc\u30eb\u304c\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u306b\u5c4a\u304d\u3001\u6700\u7d42\u7684\u306b\u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3078\u5230\u9054\u3059\u308b\u3082\u306e\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>ARC\u306f\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306b\u304a\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u69d8\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"kh-box is-style-bg-sky-blue\"><div class=\"kh-box__content\">\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u5f8c\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u304cSPF\/DKIM\/DMARC\u306e\u8a8d\u8a3c\u60c5\u5831\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30e1\u30fc\u30eb\u306e\u4ef6\u540d\u306b\u3010example-ml\u3011\u306e\u3088\u3046\u306a\u6587\u5b57\u5217\u3092\u4ed8\u4e0e\u3057\u3001\u30d5\u30c3\u30bf\u30fc\u306b\u306f\u8cfc\u8aad\u89e3\u9664\u30ea\u30f3\u30af\u3092\u4ed8\u3051\u307e\u3059\u3002\u3053\u306e\u64cd\u4f5c\u306b\u3088\u3063\u3066\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc\u306e\u66f8\u304d\u63db\u3048\u304c\u767a\u751f\u3059\u308b\u306e\u3067\u3059\u3002<\/li>\n\n\n\n<li>\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u306f\u3001SPF\/DKIM\/DMARC\u306e\u8a8d\u8a3c\u7d50\u679c\u304c\u8a18\u9332\u3055\u308c\u305fARC\u30d8\u30c3\u30c0\u3092\u30e1\u30fc\u30eb\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306f\u3001SPF\/DKIM\/DMARC\u306b\u3088\u308b\u8a8d\u8a3c\u3092\u304a\u3053\u306a\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u304c\u66f8\u304d\u63db\u3048\u3089\u308c\u3066\u3044\u308b\u3053\u3068\u304b\u3089\u3001\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u30e1\u30fc\u30eb\u306f\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3055\u308c\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u304cSPF\/DKIM\/DMARC\u306e\u307f\u3067\u304a\u3053\u306a\u308f\u308c\u305f\u306a\u3089\u3053\u308c\u3067\u8a8d\u8a3c\u306f\u304a\u308f\u308a\u3067\u3059\u304c\u3001\u3053\u306e\u6d41\u308c\u3067\u306f\u305d\u3046\u306a\u308a\u307e\u305b\u3093\u3002\u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306fARC\u30d8\u30c3\u30c0\u3082\u78ba\u8a8d\u3057\u3001\u8a8d\u8a3c\u306b\u6210\u529f\u3059\u308c\u3070\u3001\u305d\u306e\u7d50\u679c\u304cSPF\/DKIM\/DMARC\u306b\u3088\u308b\u8a8d\u8a3c\u5931\u6557\u3088\u308a\u512a\u5148\u3055\u308c\u308b\u306e\u3067\u3059\u3002\u7d50\u679c\u7684\u306b\u9001\u4fe1\u30e1\u30fc\u30eb\u306f\u8a8d\u8a3c\u5931\u6557\u306b\u3088\u308b\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3082\u56de\u907f\u3057\u3001\u9001\u4fe1\u5148\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u7121\u4e8b\u5c4a\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">ARC\u306b\u3088\u308b\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e\u4ed5\u7d44\u307f | \u5f93\u6765\u306e\u6280\u8853\u3068\u4f55\u304c\u9055\u3046\uff1f<\/h2>\n\n\n\n<p>ARC\u306b\u3088\u308b\u8a8d\u8a3c\u306f\u3001\u5f93\u6765\u306eSPF\/DKIM\/DMARC\u306b\u3088\u308b\u8a8d\u8a3c\u3068\u4ed5\u7d44\u307f\u304c\u7570\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u3001\u5f93\u6765\u306e\u6280\u8853\u3068\u4f55\u304c\u9055\u3046\u304b\u3068\u3042\u308f\u305b\u3066ARC\u306b\u3088\u308b\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e\u4ed5\u7d44\u307f\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5f93\u6765\u306e\u6280\u8853\uff08SPF\/DKIM\/DMARC\uff09\u304c\u6307\u6458\u3055\u308c\u3066\u3044\u308b\u554f\u984c\u70b9<\/h3>\n\n\n\n<p>\u5f93\u6765\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\uff08SPF\/DKIM\/DMARC\uff09\u3067\u306f\u3001\u3069\u306e\u3088\u3046\u306a\u554f\u984c\u70b9\u304c\u6307\u6458\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u4ee5\u4e0b\u3001\u3072\u3068\u3064\u305a\u3064\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u3010SPF\u306e\u554f\u984c\u70b9\u3011<\/h4>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/failspf.png\" alt=\"SPF\u306e\u554f\u984c\u70b9\u306e\u56f3\u89e3\" class=\"wp-image-14876\"\/><\/figure>\n\n\n\n<p>SPF\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3001\u3042\u3089\u304b\u3058\u3081DNS\u30b5\u30fc\u30d0\u30fc\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u3001\u6b63\u3057\u3044\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u767b\u9332\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u305d\u3046\u3057\u3066\u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\u306f\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u3063\u305f\u969b\u306b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u304c\u5ba3\u8a00\u3057\u305f\u3068\u304a\u308a\u306eIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u9001\u3089\u308c\u305f\u304b\u78ba\u8a8d\u3059\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u672c\u6765\u3067\u3042\u308c\u3070\u9001\u4fe1\u3055\u308c\u305f\u30e1\u30fc\u30eb\u306f\u3001\u5f53\u7136\u6b63\u3057\u3044\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u9001\u3089\u308c\u3066\u3044\u308b\u306e\u3067\u3001SPF\u306e\u8a8d\u8a3c\u306f\u6210\u529f\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u3059\u308b\u3068\u3001\u9001\u4fe1\u5143\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u306e\u3082\u306e\u3068\u306a\u308b\u306e\u3067\u3059\u3002\u3053\u306e\u5834\u5408SPF\u30ec\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u5ba3\u8a00\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u3068\u306f\u7570\u306a\u308b\u305f\u3081\u3001SPF\u306e\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u3010DKIM\u306e\u554f\u984c\u70b9\u3011<\/h4>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/faildkim.png\" alt=\"DKIM\u306e\u554f\u984c\u70b9\u306e\u56f3\u89e3\" class=\"wp-image-14877\"\/><\/figure>\n\n\n\n<p>DKIM\u306b\u3088\u308b\u8a8d\u8a3c\u3067\u306f\u3001\u304a\u304a\u307e\u304b\u306b\u3044\u3046\u3068\u4ee5\u4e0b2\u3064\u306e\u30cf\u30c3\u30b7\u30e5\u5024\u304c\u4e00\u81f4\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"kh-box is-style-bg-sky-blue\"><div class=\"kh-box__content\">\n<p>\u2460 \u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u9001\u4fe1\u30e1\u30fc\u30eb\u306e\u672c\u6587\u30fb\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc\u304b\u3089\u4f5c\u6210\u3057\u305f\u30cf\u30c3\u30b7\u30e5\u5024<br>\u2461 \u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u53d7\u3051\u53d6\u3063\u305f\u30e1\u30fc\u30eb\u306e\u672c\u6587\u30fb\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u304b\u3089\u4f5c\u6210\u3057\u305f\u30cf\u30c3\u30b7\u30e5\u5024<\/p>\n<\/div><\/div>\n\n\n\n<p>\u672c\u6765\u306a\u3089\u3001\u6b63\u3057\u3044\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u30e1\u30fc\u30eb\u304c\u9001\u3089\u308c\u3066\u3044\u308c\u3070\u3001\u4e0a\u8a182\u3064\u304c\u4e00\u81f4\u3057\u3066\u8a8d\u8a3c\u306b\u6210\u529f\u3059\u308b\u7b48\u3067\u3059\u3002\u3057\u304b\u3057\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u3059\u308b\u3068\u3001\u30cf\u30c3\u30b7\u30e5\u5024\u306e\u4f5c\u6210\u306b\u4f7f\u308f\u308c\u308b\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc\u30fb\u672c\u6587\u304c\u66f8\u304d\u63db\u3048\u3089\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u7d50\u679c\u3001\u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067\u4f5c\u6210\u3055\u308c\u308b\u30cf\u30c3\u30b7\u30e5\u5024\u3068\u3001\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u4f5c\u6210\u3057\u305f\u30cf\u30c3\u30b7\u30e5\u5024\u304c\u4e00\u81f4\u3057\u306a\u304f\u306a\u308b\u306e\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u306f\u3001DKIM\u306e\u8a8d\u8a3c\u306b\u5931\u6557\u3059\u308b\u53ef\u80fd\u6027\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u3010DMARC\u306e\u554f\u984c\u70b9\u3011<\/h4>\n\n\n\n<p>DMARC\u306f\u3001SPF\u30fbDKIM\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u6d3b\u7528\u3057\u3001\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u304c\u306a\u308a\u3059\u307e\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\u3067\u3059\u3002\u30e1\u30fc\u30eb\u8ee2\u9001\u306a\u3069\u3067SPF\u30fbDKIM\u306e\u8a8d\u8a3c\u306b\u5931\u6557\u3059\u308b\u3068\u3001DMARC\u3082\u6b63\u78ba\u306b\u5224\u5b9a\u3067\u304d\u306a\u304f\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">ARC\u306f\u30e1\u30fc\u30eb\u306b\u300cARC\u30d8\u30c3\u30c0\u300d\u3092\u8ffd\u52a0\u3057\u3066\u5f93\u6765\u306e\u554f\u984c\u70b9\u3092\u514b\u670d<\/h3>\n\n\n\n<p>ARC\u3067\u306f\u30e1\u30fc\u30eb\u306b\u300cARC\u30d8\u30c3\u30c0\u300d\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u304c\u8ee2\u9001\u3055\u308c\u3066\u3082\u8a8d\u8a3c\u7d50\u679c\u304c\u4fdd\u6301\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5177\u4f53\u7684\u306b\u306f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u30e1\u30fc\u30eb\u3092\u4e2d\u7d99\u3059\u308b\u969b\u306b\u3001\u305d\u306e\u6642\u70b9\u3067\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u7d50\u679c\u306a\u3069\u3092\u542b\u3080ARC\u30d8\u30c3\u30c0\u3092\u8ffd\u52a0\u3059\u308b\u306e\u3067\u3059\u3002\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u306a\u3069\u3092\u30e1\u30fc\u30eb\u304c\u7d4c\u7531\u3059\u308b\u524d\u306a\u306e\u3067\u3001\u3053\u306e\u6642\u70b9\u3067\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u304c\u5931\u6557\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u306f\u4f4e\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306fSPF\/DKIM\/DMARC\u306b\u3088\u308b\u8a8d\u8a3c\u304c\u5931\u6557\u3057\u3066\u3082\u3001ARC\u30d8\u30c3\u30c0\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u53c2\u7167\u3057\u4fe1\u983c\u6027\u3092\u8a55\u4fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ARC\u30d8\u30c3\u30c0\u306e\u7a2e\u985e\u3068\u898b\u65b9<\/h4>\n\n\n\n<p>ARC\u30d8\u30c3\u30c0\u306f\u4ee5\u4e0b\u306b\u3042\u3052\u308b3\u3064\u306e\u7a2e\u985e\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u25a0AAR(ARC-Authentication-Results)<\/strong><br>\uff1c\u30b5\u30f3\u30d7\u30eb\uff1e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ARC-Authentication-Results: i=1; mx.example.com;\n          dkim=pass header.d=example.com;\n          spf=pass smtp.mailfrom=sender@example.com;\n          dmarc=pass (p=none sp=none dis=none) header.from=example.com<\/code><\/pre>\n\n\n\n<p>\u5404\u4e2d\u7d99\u30b5\u30fc\u30d0\u30fc\u304cSPF\/DKIM\/DMARC\u306a\u3069\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u8a18\u9332\u3059\u308b\u30d8\u30c3\u30c0\u3067\u3059\u3002\u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\u306fARC\u30d8\u30c3\u30c0\u3092\u8fbf\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u8ffd\u8de1\u3057\u30e1\u30fc\u30eb\u306e\u4fe1\u983c\u6027\u3092\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>i\uff1d1<\/strong><\/td><td>ARC\u7f72\u540d\u3092\u304a\u3053\u306a\u3063\u305f\u306e\u304c\u4f55\u756a\u76ee\u304b\u3092\u793a\u3057\u307e\u3059\u3002<br>\u30e1\u30fc\u30eb\u8ee2\u9001\u304c\u7d9a\u304f\u5834\u5408\u306f\u3001\u3053\u306e\u6570\u5b57\u304c\u5897\u3048\u3066\u3044\u304f\u308f\u3051\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>mx.example.com<\/strong><\/td><td>\u8a18\u8f09\u3055\u308c\u305f\u8a8d\u8a3c\u7d50\u679c\u3092\u751f\u6210\u30fb\u8a18\u9332\u3057\u305f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30db\u30b9\u30c8\u540d\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>dkim=pass<\/strong>\/<br><strong>spf=pass<\/strong><br><strong>dmarc=pass<\/strong><\/td><td>DKIM\/SPF\/DMARC\u306e\u8a8d\u8a3c\u7d50\u679c\u3067\u3059\u3002<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">AAR\u30d8\u30c3\u30c0\u306e\u898b\u65b9<\/figcaption><\/figure>\n\n\n\n<p><strong>\u25a0AMS\uff08ARC-Message-Signature\uff09<\/strong><br>\uff1c\u30b5\u30f3\u30d7\u30eb\uff1e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed\/relaxed;\n          d=example.com; s=arcselector; t=1695987600;\n          h=from:to:subject:date:message-id;\n          bh=xyz456...; b=def789...<\/code><\/pre>\n\n\n\n<p>\u30e1\u30fc\u30eb\u672c\u6587\u3084\u30d8\u30c3\u30c0\u304c\u6539\u3056\u3093\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u96fb\u5b50\u7f72\u540d\u3067\u3059\u3002\u3053\u306e\u30d8\u30c3\u30c0\u306b\u3088\u308a\u3001\u30e1\u30fc\u30eb\u306e\u5185\u5bb9\u304c\u9001\u4fe1\u6642\u306e\u307e\u307e\u5909\u308f\u3063\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>i\uff1d1<\/strong><\/td><td>ARC\u7f72\u540d\u304c\u4f55\u756a\u76ee\u304b\u3092\u793a\u3057\u307e\u3059\u3002<\/td><\/tr><tr><td><strong>a=rsa-sha256<\/strong><\/td><td>\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u96fb\u5b50\u7f72\u540d\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>c=relaxed\/relaxed<\/strong><\/td><td>\u6b63\u898f\u5316\u306e\u65b9\u6cd5\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>d=example.com<\/strong><\/td><td>\u7f72\u540d\u3092\u304a\u3053\u306a\u3063\u305f\u30c9\u30e1\u30a4\u30f3\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>s=arcselector<\/strong><\/td><td>\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bDKIM\u30bb\u30ec\u30af\u30bf\u30fc\uff08DKIM\u7f72\u540d\u306b\u5fc5\u8981\u306a\u8ffd\u52a0\u60c5\u5831\uff09\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>t=1695987600;<\/strong><\/td><td>\u7f72\u540d\u4f5c\u6210\u6642\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>bh=xyz4\u2026<\/strong><\/td><td>\u96fb\u5b50\u7f72\u540d\u306e\u672c\u4f53\u3067\u3059\u3002<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">AMS\u30d8\u30c3\u30c0\u306e\u898b\u65b9<\/figcaption><\/figure>\n\n\n\n<p><strong>\u25a0AS\uff08ARC-Seal\uff09<\/strong><br>\uff1c\u30b5\u30f3\u30d7\u30eb\uff1e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ARC-Seal: i=1; a=rsa-sha256; d=example.com; s=arcselector;\n          t=1695987600; cv=pass; b=abc123...<\/code><\/pre>\n\n\n\n<p>ARC\u30d8\u30c3\u30c0\u304c\u6539\u3056\u3093\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u96fb\u5b50\u7f72\u540d\u3067\u3059\u3002AS\u30d8\u30c3\u30c0\u306f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u901a\u904e\u3059\u308b\u969b\u306e\u8a8d\u8a3c\u60c5\u5831\u3092\u5c01\u5370\u3057\u3001\u305d\u306e\u4fe1\u983c\u6027\u3092\u62c5\u4fdd\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>i\uff1d1<\/strong><\/td><td>ARC\u7f72\u540d\u304c\u4f55\u756a\u76ee\u304b\u3092\u793a\u3057\u307e\u3059\u3002<\/td><\/tr><tr><td><strong>a=rsa-sha256<\/strong><\/td><td>\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u96fb\u5b50\u7f72\u540d\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>d=example.com<\/strong><\/td><td>\u7f72\u540d\u3092\u304a\u3053\u306a\u3063\u305f\u30c9\u30e1\u30a4\u30f3\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>s=arcselector<\/strong><\/td><td>\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bDKIM\u30bb\u30ec\u30af\u30bf\u30fc\uff08DKIM\u7f72\u540d\u306b\u5fc5\u8981\u306a\u8ffd\u52a0\u60c5\u5831\uff09\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>cv=pass<\/strong><\/td><td>ARC\u8a8d\u8a3c\u306e\u7d50\u679c\u3067\u3059\u3002<\/td><\/tr><tr><td><strong>b=abc123&#8230;<\/strong><\/td><td>\u96fb\u5b50\u7f72\u540d\u306e\u672c\u4f53\u3067\u3059\u3002<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">AS\u30d8\u30c3\u30c0\u306e\u898b\u65b9<\/figcaption><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u30e1\u30fc\u30e9\u30fc\u3067ARC\u30d8\u30c3\u30c0\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5<\/h4>\n\n\n\n<p>\u30e1\u30fc\u30e9\u30fc\u3067ARC\u30d8\u30c3\u30c0\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001\u5bfe\u8c61\u3068\u306a\u308b\u30e1\u30fc\u30eb\u3092\u958b\u3044\u305f\u3046\u3048\u3067\u305d\u306e\u30e1\u30fc\u30eb\u306e\u30d8\u30c3\u30c0\u30fc\u60c5\u5831\uff08\u30bd\u30fc\u30b9\uff09\u3092\u8868\u793a\u3055\u305b\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u30e1\u30fc\u30e9\u30fc\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u306e\u3067\u4ed8\u5c5e\u306e\u30de\u30cb\u30e5\u30a2\u30eb\u306a\u3069\u3092\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u4e00\u4f8b\u3068\u3057\u3066Gmail\u3067\u3042\u308c\u3070\u3001\u5bfe\u8c61\u306e\u30e1\u30fc\u30eb\u3092\u958b\u3044\u305f\u3046\u3048\u3067\u53f3\u4e0a\u306e\u4e09\u70b9\u30ea\u30fc\u30c0\u30fc\u304b\u3089\u300c\u539f\u6587\u3092\u8868\u793a\u300d\u3092\u30af\u30ea\u30c3\u30af\u3057\u307e\u3059\u3068\u3001\u4ee5\u4e0b\u306e\u69d8\u306bARC\u30d8\u30c3\u30c0\u306e\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/gmailarccapture.png\" alt=\"\" class=\"wp-image-14884\"\/><figcaption class=\"wp-element-caption\">Gmail\u3067ARC\u30d8\u30c3\u30c0\u306e\u78ba\u8a8d\u3067\u304d\u308b\u5834\u6240<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u30e1\u30fc\u30eb\u306eARC\u306b\u3064\u3044\u3066\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/qa.jpeg\" alt=\"\" class=\"wp-image-12895\"\/><\/figure>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u30e1\u30fc\u30eb\u306eARC\u3092\u5229\u7528\u3059\u308b\u306b\u3042\u305f\u3063\u3066\u3001\u3088\u304f\u3042\u308b\u8cea\u554f\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">ARC\u306e\u5c0e\u5165\u306b\u3042\u305f\u3063\u3066DNS\u30ec\u30b3\u30fc\u30c9\u306e\u767b\u9332\u306f\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p>ARC\u81ea\u4f53\u306e\u5c0e\u5165\u306b\u3042\u305f\u3063\u3066\u306f\u3001DNS\u30ec\u30b3\u30fc\u30c9\u306e\u767b\u9332\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002ARC\u3092\u5c0e\u5165\u3059\u308b\u5834\u5408\u306f\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u5bfe\u5fdc\u3092\u304a\u3053\u306a\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u304aARC\u306fSPF\/DKIM\/DMARC\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u5229\u7528\u3057\u307e\u3059\u304c\u3001SPF\/DKIM\/DMARC\u306e\u904b\u7528\u306b\u306fDNS\u30ec\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">arc-authentication-results\u3068\u5f93\u6765\u306e\u30d8\u30c3\u30c0\u3068\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p><strong>\u30fbarc-authentication-results\u30d8\u30c3\u30c0\u30b5\u30f3\u30d7\u30eb<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ARC-Authentication-Results: i=1; example.com;\n    dkim=pass header.d=example.net;\n    spf=pass smtp.mailfrom=sender@example.net;\n    dmarc=pass (p=none) header.from=example.net<\/code><\/pre>\n\n\n\n<p><strong>\u30fb\u5f93\u6765\u306eauthentication-results\u30d8\u30c3\u30c0\u30b5\u30f3\u30d7\u30eb<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Authentication-Results: example.com;\n    dkim=pass header.d=example.net;\n    spf=pass smtp.mailfrom=sender@example.net;\n    dmarc=pass (p=none) header.from=example.net<\/code><\/pre>\n\n\n\n<p>\u5f93\u6765\u306eauthentication-results\u30d8\u30c3\u30c0\u306f\u3001\u6700\u7d42\u7684\u306b\u5bfe\u8c61\u306e\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3059\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\uff08\u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\uff09\u306b\u3088\u308b\u8a8d\u8a3c\u7d50\u679c\u304c\u8a18\u9332\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3067arc-authentication-results\u30d8\u30c3\u30c0\u306b\u8a18\u9332\u3055\u308c\u3066\u3044\u308b\u306e\u306f\u3001\u5bfe\u8c61\u30e1\u30fc\u30eb\u3092\u4e2d\u7d99\u3059\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u308b\u8a8d\u8a3c\u7d50\u679c\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u5f93\u6765\u306eauthentication-results\u30d8\u30c3\u30c0\u306f\u3001\u305d\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u76f4\u63a5\u8a8d\u8a3c\u3057\u305f\u7d50\u679c\u304c\u8a18\u8f09\u3055\u308c\u307e\u3059\u3002\u4e00\u65b9\u3067arc-authentication-results\u306b\u8a18\u9332\u3055\u308c\u308b\u306e\u306f\u3001\u30e1\u30fc\u30eb\u304c\u4e2d\u7d99\u3055\u308c\u308b\u904e\u7a0b\u3067\u901a\u904e\u3057\u305f\u5168\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u8a8d\u8a3c\u7d50\u679c\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u5f93\u6765\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\uff08SPF\/DKIM\/DMARC\uff09\u306f\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u3059\u308b\u306a\u3069\u3067\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u308b\u306e\u304c\u5f31\u70b9\u3067\u3057\u305f\u3002ARC\u306f\u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\u306b\u5c4a\u304f\u307e\u3067\u306b\u304a\u3053\u306a\u308f\u308c\u305f\u8a8d\u8a3c\u60c5\u5831\u3092\u3001ARC\u30d8\u30c3\u30c0\u306b\u8a18\u9332\u3059\u308b\u3053\u3068\u3067\u305d\u306e\u5f31\u70b9\u3092\u30ab\u30d0\u30fc\u3057\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304cARC\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u3001ARC\u30d8\u30c3\u30c0\u306b\u3088\u308b\u8a8d\u8a3c\u3092\u512a\u5148\u3055\u305b\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5f93\u6765\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306b\u6bd4\u3079\u3001ARC\u306f\u307e\u3060\u666e\u53ca\u3057\u3066\u3044\u308b\u3068\u306f\u3044\u3048\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3092\u5f37\u5316\u3057\u3001\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u3092\u5bfe\u7b56\u3059\u308b\u306e\u306b\u6709\u52b9\u306a\u6280\u8853\u306a\u306e\u3067\u3001\u5bfe\u5fdc\u3059\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u5897\u3048\u3066\u3044\u304f\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n<div class=\"kh-cta\"><div class=\"entry-content\">\n<div class=\"kh-box has-label is-style-yellow\"><div class=\"kh-box__label\">\u3042\u306a\u305f\u306e\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5927\u4e08\u592b\u3067\u3059\u304b\uff1f<\/div><div class=\"kh-box__content\">\n<p class=\"has-medium-font-size\"><strong><span class=\"kh-marker-blue\">\u6700\u65b0\u52d5\u5411\u5bfe\u5fdc\u5ea6\u309220\u9805\u76ee\u3067\u5373\u30c1\u30a7\u30c3\u30af\uff01<\/span><\/strong><\/p>\n\n\n\n<p>\u30e1\u30fc\u30eb\u74b0\u5883\u306b\u306f\u3001PPAP\u306e\u9650\u754c\uff0f\u306a\u308a\u3059\u307e\u3057\uff0f\u8aa4\u9001\u4fe1\uff0f\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u4e0d\u5099\uff0f\u8ff7\u60d1\u30e1\u30fc\u30eb\uff0f\u30a2\u30fc\u30ab\u30a4\u30d6\u4e0d\u8db3\u306a\u3069\u3001\u8907\u5408\u7684\u306a\u30ea\u30b9\u30af\u304c\u96c6\u4e2d\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u306e\u8cc7\u6599\u3067\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u81ea\u5df1\u8a3a\u65ad\u3057\u3001\u73fe\u72b6\u3068\u512a\u5148\u5bfe\u7b56\u3092\u660e\u78ba\u5316\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full has-lightbox\"><a href=\"https:\/\/www.kagoya.jp\/document\/form-mailsecurity-check\/?argument=vqHX23Xs&amp;dmai=a658cdc89bf06c\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"728\" height=\"90\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/c0d5f3c905ab8673bd3286aaef85b3d7.png\" alt=\"\" class=\"wp-image-14327\" srcset=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/c0d5f3c905ab8673bd3286aaef85b3d7.png 728w, https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/c0d5f3c905ab8673bd3286aaef85b3d7-300x37.png 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306b\u3088\u308b\u88ab\u5bb3\u306f\u62e1\u5927\u3059\u308b\u3070\u304b\u308a\u3067\u3001\u305d\u306e\u5bfe\u7b56\u306e\u5fc5\u8981\u6027\u3082\u5897\u3057\u3066\u3044\u308b\u72b6\u6cc1\u3067\u3059\u3002 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[&hellip;]","protected":false},"author":2,"featured_media":14084,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[125],"tags":[68,72,304],"pickup":[],"sitedisplay":[],"sitetarget":[],"class_list":["post-14079","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mail","tag-68","tag-72","tag-304"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u30e1\u30fc\u30eb\u306eARC\u3068\u306f\uff1f\u8a8d\u8a3c\u5931\u6557\u3092\u9632\u304e\u4fe1\u983c\u6027\u3092\u9ad8\u3081\u308b\u7406\u7531\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac - \u30ab\u30b4\u30e4\u306e\u30b5\u30fc\u30d0\u30fc\u7814\u7a76\u5ba4<\/title>\n<meta name=\"description\" content=\"\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306b\u3088\u308b\u88ab\u5bb3\u306f\u62e1\u5927\u3059\u308b\u3070\u304b\u308a\u3067\u3001\u305d\u306e\u5bfe\u7b56\u306e\u5fc5\u8981\u6027\u3082\u5897\u3057\u3066\u3044\u308b\u72b6\u6cc1\u3067\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kagoya.jp\/howto\/it-glossary\/mail\/arc\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30e1\u30fc\u30eb\u306eARC\u3068\u306f\uff1f\u8a8d\u8a3c\u5931\u6557\u3092\u9632\u304e\u4fe1\u983c\u6027\u3092\u9ad8\u3081\u308b\u7406\u7531\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac - \u30ab\u30b4\u30e4\u306e\u30b5\u30fc\u30d0\u30fc\u7814\u7a76\u5ba4\" \/>\n<meta property=\"og:description\" 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