{"id":19761,"date":"2026-06-07T08:36:35","date_gmt":"2026-06-07T06:36:35","guid":{"rendered":"https:\/\/webhosting.de\/mailserver-header-analysis-spam-check\/"},"modified":"2026-06-07T08:36:35","modified_gmt":"2026-06-07T06:36:35","slug":"%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc%e3%83%98%e3%83%83%e3%83%80%e3%83%bc%e8%a7%a3%e6%9e%90%e3%82%b9%e3%83%91%e3%83%a0%e3%83%81%e3%82%a7%e3%83%83%e3%82%af","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/mailserver-header-analysis-spam-check\/","title":{"rendered":"\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u30d8\u30c3\u30c0\u30fc\u5206\u6790\uff1a\u30b9\u30d1\u30e0\u3092\u78ba\u5b9f\u306b\u8a8d\u8b58\u3059\u308b"},"content":{"rendered":"<p>\u3092\u898b\u308b\u3068\u3001\u30b9\u30d1\u30e0\u3092\u78ba\u5b9f\u306b\u898b\u5206\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u30d8\u30c3\u30c0\u30fc<\/strong> \u3068\u6280\u8853\u7684\u75d5\u8de1\u3092\u5206\u6790\u3057\u307e\u3059\u3002\u5bfe\u8c61\u3068\u306a\u308b\u30d8\u30c3\u30c0\u30fc\u89e3\u6790\u306f\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u767a\u4fe1\u5143\u3001\u8f38\u9001\u7d4c\u8def\u3001\u8a8d\u8a3c\u3092\u793a\u3057\u3001\u305d\u306e\u7d50\u679c\u3001\u6b3a\u779e\u3084\u914d\u9001\u30a8\u30e9\u30fc\u3092\u8fc5\u901f\u304b\u3064\u78ba\u5b9f\u306b\u660e\u3089\u304b\u306b\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<p>\u79c1\u306f\u5b8c\u5168\u306b\u4fe1\u983c\u3057\u3066\u3044\u308b\u3002 <strong>\u751f\u30d8\u30c3\u30c0\u30fc<\/strong> \u305d\u3057\u3066\u30b5\u30fc\u30d0\u30fc\u30fb\u30c1\u30a7\u30fc\u30f3\u3092\u9006\u304b\u3089\u8aad\u3080\u3002IP\u3001\u30db\u30b9\u30c8\u540d\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u6bb5\u968e\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002SPF\u3001DKIM\u3001DMARC\u306e\u7d50\u679c\u3092\u5358\u72ec\u3067\u306f\u306a\u304f\u3001\u7d44\u307f\u5408\u308f\u305b\u3066\u5206\u6790\u3059\u308b\u3002\u76ee\u7acb\u3064\u53d7\u4fe1\u884c\u3001\u4e00\u8cab\u6027\u306e\u306a\u3044\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3001\u64cd\u4f5c\u53ef\u80fd\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6587\u8108\u306b\u6cbf\u3063\u3066\u5206\u985e\u3059\u308b\u3002\u6700\u7d42\u7684\u306b\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u6b63\u5f53\u306a\u3082\u306e\u304b\u3069\u3046\u304b\u3001\u660e\u78ba\u306a\u753b\u50cf\u304c\u6d6e\u304b\u3073\u4e0a\u304c\u308b\u3002 <strong>\u30b9\u30d1\u30e0<\/strong>.<\/p>\n<ul>\n  <li><strong>\u53d7\u3051\u53d6\u3063\u305f\u30c1\u30a7\u30fc\u30f3<\/strong> \u7d9a\u304d\u3092\u8aad\u3080<\/li>\n  <li><strong>SPF\/DKIM\/DMARC<\/strong> \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30c1\u30a7\u30c3\u30af<\/li>\n  <li><strong>\u9001\u4fe1\u8005IP<\/strong> \u3068\u30db\u30b9\u30c8\u540d\u3092\u6bd4\u8f03\u3059\u308b<\/li>\n  <li><strong>\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9<\/strong> \u30d8\u30c3\u30c0\u30fc\u30c7\u30fc\u30bf\u3068\u306e\u4e00\u81f4<\/li>\n  <li><strong>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7<\/strong> \u59a5\u5f53\u6027\u306e\u30c1\u30a7\u30c3\u30af<\/li>\n<\/ul>\n\n<h2>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30d8\u30c3\u30c0\u30fc\u306f\u672c\u5f53\u306f\u4f55\u3092\u793a\u3057\u3066\u3044\u308b\u306e\u304b\uff1f<\/h2>\n\n<p>\u30d8\u30c3\u30c0\u30fc\u306b\u306f\u3001\u6280\u8853\u7684\u306a <strong>\u30e1\u30bf\u30c7\u30fc\u30bf<\/strong>, \u30e1\u30fc\u30eb\u30bd\u30d5\u30c8\u304c\u3057\u3070\u3057\u3070\u96a0\u3057\u3066\u3044\u308b\u3053\u3068\u3060\u3002\u79c1\u306f\u3001\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3001\u53d7\u4fe1\u8005\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3001\u914d\u4fe1\u306e\u5404\u30b5\u30fc\u30d0\u30fc\u5c40\u3092\u8aad\u3080\u3002Received\u3001Return-Path\u3001Authentication-Results\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u7279\u306b\u91cd\u8981\u3067\u3042\u308b\u3002\u3053\u308c\u3089\u306f\u5b9f\u969b\u306e\u9001\u4fe1\u8005IP\u3068\u6587\u66f8\u5316\u3055\u308c\u305f\u767a\u9001\u7d4c\u8def\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u3002\u3053\u308c\u3089\u306e\u30b7\u30b0\u30ca\u30eb\u3053\u305d\u304c\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u507d\u88c5\u3092\u66b4\u304f\u306e\u3060\u3002 <strong>\u9001\u4fe1\u8005<\/strong> \u4e2d\u8eab\u306f\u304d\u308c\u3044\u3060\u304c\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/mailserver-analyse-4892.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u53d7\u4fe1\u3057\u305f\u30c1\u30a7\u30fc\u30f3\u3092\u5b89\u5168\u306b\u8aad\u3080<\/h2>\n\n<p>\u306e\u4e0b\u7aef\u304b\u3089\u59cb\u3081\u308b\u3002 <strong>\u53d7\u9818<\/strong>-\u306a\u305c\u306a\u3089\u3001\u65c5\u306e\u51fa\u767a\u70b9\u304c\u305d\u3053\u306b\u3042\u308b\u304b\u3089\u3067\u3042\u308b\u3002\u305d\u308c\u305e\u308c\u306e\u884c\u306f\u3001\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u4ed8\u3051\u305f\u30b5\u30fc\u30d0\u30fc\u306b\u3088\u3063\u3066\u66f8\u304b\u308c\u308b\u306e\u3067\u3001\u8ffd\u8de1\u304c\u5bb9\u6613\u306b\u306a\u308b\u3002\u30db\u30b9\u30c8\u540d\u3001IP\u30a2\u30c9\u30ec\u30b9\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304c\u4e00\u81f4\u3059\u308c\u3070\u3001\u30eb\u30fc\u30c8\u306f\u3082\u3063\u3068\u3082\u3089\u3057\u3044\u3002\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u8ee2\u9001\u307e\u305f\u306f\u30d5\u30a3\u30eb\u30bf\u30fc\u30b9\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u53ef\u80fd\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u79c1\u306b\u3068\u3063\u3066\u306f\u3001\u65e2\u77e5\u306e\u30ce\u30fc\u30c9\u9593\u306e\u672a\u77e5\u306e\u30db\u30b9\u30c8\u306f\u5f37\u529b\u306a\u624b\u304c\u304b\u308a\u3068\u306a\u308b\u3002 <strong>\u8b66\u544a\u4fe1\u53f7<\/strong>.<\/p>\n\n<h2>\u30d8\u30c3\u30c0\u30fc\u5185\u306eSPF\u3001DKIM\u3001DMARC\u3092\u8a55\u4fa1\u3059\u308b<\/h2>\n\n<p>Authentication-Results\uff08\u8a8d\u8a3c\u7d50\u679c\uff09\u3067\u4ee5\u4e0b\u3092\u691c\u7d22\u3059\u308b\u3002 <strong>SPF<\/strong>, DKIM\u3068DMARC\u306f\u3001\u5408\u5426\u60c5\u5831\u304c\u660e\u78ba\u3067\u3042\u308b\u3002SPF\u30d1\u30b9\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u30a2\u30e9\u30a4\u30f3\u30e1\u30f3\u30c8\u3068\u30a2\u30a4\u30c7\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u53ef\u8996\u30a2\u30c9\u30ec\u30b9\u3068\u4e00\u81f4\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u304b\u3089\u3060\u3002DMARC\u306f\u3001SPF\u3068DKIM\u306e\u30c1\u30a7\u30c3\u30af\u3092\u30c9\u30e1\u30a4\u30f3\u30ec\u30d9\u30eb\u3067\u30d0\u30f3\u30c9\u30eb\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u6700\u3082\u96e3\u3057\u3044\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4e0e\u3048\u3066\u304f\u308c\u308b\u3002\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u5b89\u5b9a\u6027\u304c\u6b20\u3051\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3084\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306a\u3069\u306e\u539f\u56e0\u3092\u8abf\u3079\u307e\u3059\u3002\u30dd\u30ea\u30b7\u30fc\u3068\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306f\u4ee5\u4e0b\u306e\u3082\u306e\u3092\u898b\u3066\u3044\u308b\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-spf-%e3%82%a2%e3%83%a9%e3%82%a4%e3%83%a1%e3%83%b3%e3%83%88-dmarc-%e3%83%9d%e3%83%aa%e3%82%b7%e3%83%bc%e3%82%ac%e3%82%a4%e3%83%89\/\">SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068DMARC<\/a>, \u5916\u308c\u5024\u3092\u660e\u78ba\u306b\u8aac\u660e\u3059\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/header_analysis_1234.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30d8\u30c3\u30c0\u30fc\u306e\u8b66\u544a\u4fe1\u53f7\u3092\u7d20\u65e9\u304f\u8a8d\u8b58<\/h2>\n\n<p>\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3068 <strong>\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9<\/strong> \u306f\u4e00\u7dd2\u306b\u306a\u3089\u306a\u3044\u3002\u53d7\u4fe1\u3057\u305f\u56de\u7dda\u9593\u306e\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u304c\u98df\u3044\u9055\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u64cd\u4f5c\u3084\u7570\u5e38\u306a\u56de\u308a\u9053\u3092\u793a\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u5916\u56fd\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089\u306e\u9001\u4fe1\u8005IP\u304c\u3001\u4e3b\u8981\u306a\u30d6\u30e9\u30f3\u30c9\u3068\u4e00\u81f4\u3059\u308b\u3053\u3068\u306f\u3081\u3063\u305f\u306b\u306a\u3044\u3002\u7279\u306b\u51fa\u6240\u304c\u7591\u308f\u3057\u3044\u5927\u91cf\u306e\u30e1\u30fc\u30eb\u306e\u5834\u5408\u3001\u8a8d\u8a3c\u304c\u6b20\u3051\u3066\u3044\u305f\u308a\u3001\u9593\u9055\u3063\u3066\u3044\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u4e88\u60f3\u3055\u308c\u308b\u3002\u4e00\u65b9\u3001\u30eb\u30fc\u30c8\u3001\u7f72\u540d\u3001\u30c9\u30e1\u30a4\u30f3\u304c\u6b63\u3057\u3044\u5834\u5408\u3001\u79c1\u306f <strong>\u30ea\u30b9\u30af<\/strong> \u306f\u3063\u304d\u308a\u3068\u3002<\/p>\n\n<h2>\u30d8\u30c3\u30c0\u30fc\u30c7\u30fc\u30bf\u306b\u3088\u308b\u914d\u4fe1\u6027\u306e\u5411\u4e0a<\/h2>\n\n<p>\u79c1\u306f\u30d8\u30c3\u30c0\u30fc\u3092\u4f7f\u3063\u3066\u914d\u4fe1\u30a8\u30e9\u30fc\u3092\u72d9\u3046\u3002 <strong>\u8a3a\u65ad\u3059\u308b<\/strong>. .\u30e1\u30fc\u30eb\u304c\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0\u306b\u8868\u793a\u3055\u308c\u305f\u3089\u3001\u307e\u305aDKIM\u30a8\u30e9\u30fc\u3084SPF\u306e\u4e71\u7528\u3092\u63a2\u3057\u307e\u3059\u3002\u4e88\u671f\u3057\u306a\u3044\u4e2d\u9593\u30b9\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u8ee2\u9001\u3084\u30d5\u30a3\u30eb\u30bf\u30fc\u306e\u30eb\u30fc\u30eb\u3092\u793a\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308b\u3002\u500b\u3005\u306e\u30b5\u30fc\u30d0\u30fc\u306e\u8ffd\u52a0\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u30d6\u30ed\u30c3\u30af\u30ea\u30b9\u30c8\u306e\u624b\u304c\u304b\u308a\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u3082\u591a\u3044\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u3069\u306e\u30b5\u30a4\u30c8\u304c\u305d\u306e\u30e1\u30fc\u30eb\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u306e\u304b\u304c\u308f\u304b\u308a\u307e\u3059\u3002 <strong>\u767a\u9001<\/strong> \u672c\u5f53\u306b\u9045\u304f\u306a\u308b\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30d8\u30c3\u30c0\u30fc\u30d5\u30a3\u30fc\u30eb\u30c9<\/th>\n      <th>\u30d2\u30f3\u30c8<\/th>\n      <th>\u5178\u578b\u7684\u306a\u884c\u52d5<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u53d7\u9818<\/td>\n      <td><strong>\u8f38\u9001\u30eb\u30fc\u30c8<\/strong> \u6709\u308a\u5f97\u306a\u3044<\/td>\n      <td>DNS\/\u30ea\u30d0\u30fc\u30b9\u306e\u30c1\u30a7\u30c3\u30af\u3001\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306e\u660e\u78ba\u5316<\/td>\n    <\/tr>\n    <tr>\n      <td>\u8a8d\u8a3c\u7d50\u679c<\/td>\n      <td><strong>SPF\/DKIM<\/strong> \u5931\u6557<\/td>\n      <td>\u6b63\u3057\u3044\u8a18\u9332\u3001\u56de\u8ee2\u30ad\u30fc<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9<\/td>\n      <td><strong>\u5c01\u7b52<\/strong> \u4e56\u96e2<\/td>\n      <td>\u914d\u9001\u30b5\u30fc\u30d3\u30b9\/\u4f4f\u6240\u3068\u306e\u540c\u671f<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30e1\u30c3\u30bb\u30fc\u30b8ID<\/td>\n      <td><strong>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong> \u7591\u308f\u3057\u3044<\/td>\n      <td>\u30c1\u30a7\u30c3\u30af\u30fb\u30b8\u30a7\u30cd\u30ec\u30fc\u30b7\u30e7\u30f3\u30fb\u30b7\u30b9\u30c6\u30e0<\/td>\n    <\/tr>\n    <tr>\n      <td>\u65e5\u4ed8\/\u53d7\u4fe1<\/td>\n      <td><strong>\u30bf\u30a4\u30e0\u30ba<\/strong> \u4e00\u8cab\u6027\u306e\u306a\u3044<\/td>\n      <td>\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\/\u30b5\u30fc\u30d0\u30fc\u6642\u9593\u306e\u540c\u671f<\/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\/2026\/06\/mailserver-header-analysis-2948.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5b9f\u8df5\u624b\u9806\uff1a\u30b3\u30d4\u30fc\u3057\u305f\u30d8\u30c3\u30c0\u30fc\u304b\u3089\u8a55\u4fa1\u307e\u3067<\/h2>\n\n<p>\u79c1\u306f\u3044\u3064\u3082\u5b8c\u5168\u306b\u30b3\u30d4\u30fc\u3059\u308b\u3002 <strong>\u30d8\u30c3\u30c0\u30fc<\/strong> \u629c\u7c8b\u3060\u3051\u3067\u306a\u304f\u3001\u30e1\u30fc\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u3082\u3002\u305d\u3057\u3066\u53d7\u4fe1\u3057\u305f\u30c1\u30a7\u30fc\u30f3\u3092\u4e0b\u304b\u3089\u4e0a\u3078\u8aad\u307f\u3001\u7570\u5e38\u304c\u3042\u308c\u3070\u30cf\u30a4\u30e9\u30a4\u30c8\u3059\u308b\u3002\u9001\u4fe1\u8005\u306eIP\u3068\u8acb\u6c42\u3055\u308c\u305f\u30db\u30b9\u30c8\u540d\u3068\u30c9\u30e1\u30a4\u30f3\u3092\u7167\u5408\u3057\u307e\u3059\u3002\u305d\u308c\u304b\u3089\u521d\u3081\u3066\u3001SPF\u3001DKIM\u3001DMARC\u3092\u4e00\u7dd2\u306b\u5206\u6790\u3059\u308b\u3002\u6700\u7d42\u7684\u306a\u8a55\u4fa1\u306f\u77ed\u3044\u30e1\u30e2\u306b\u307e\u3068\u3081\u308b\u3001, <strong>\u30a2\u30a4\u30c7\u30f3\u30c6\u30a3\u30c6\u30a3<\/strong> \u3068\u30b5\u30a4\u30f3\u3059\u308b\u3002.<\/p>\n\n<h2>\u624b\u52d5\u30c6\u30b9\u30c8\u3068\u30c4\u30fc\u30eb\u306e\u6bd4\u8f03<\/h2>\n\n<p>\u81ea\u52d5\u8a55\u4fa1\u8005\u304c\u79c1\u3092\u6551\u3046 <strong>\u6642\u9593<\/strong>, \u3057\u304b\u3057\u3001\u7d30\u90e8\u3092\u898b\u308b\u76ee\u306e\u4ee3\u308f\u308a\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u79c1\u306f\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u7d20\u65e9\u304f\u89e3\u6790\u3057\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3059\u308b\u3002\u5b9f\u969b\u306e\u5224\u65ad\u306f\u3001\u7279\u306b\u5883\u754c\u7dda\u4e0a\u306e\u30b1\u30fc\u30b9\u3084\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306b\u3064\u3044\u3066\u306f\u624b\u52d5\u3067\u884c\u3044\u307e\u3059\u3002\u30b3\u30f3\u30c6\u30f3\u30c4\u30d5\u30a3\u30eb\u30bf\u30fc\u306b\u3064\u3044\u3066\u306f\u3001\u7d71\u8a08\u7684\u624b\u6cd5\u3082\u4f7f\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u624b\u9806\u306e\u6982\u8981\u3092\u628a\u63e1\u3057\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%99%e3%82%a4%e3%82%b8%e3%82%a2%e3%83%b3%e3%83%bb%e3%83%92%e3%83%a5%e3%83%bc%e3%83%aa%e3%82%b9%e3%83%86%e3%82%a3%e3%83%83%e3%82%af%e3%83%bb%e3%82%b9%e3%83%91%e3%83%a0%e3%83%bb%e3%83%95%e3%82%a3\/\">\u30d9\u30a4\u30b8\u30a2\u30f3\u30d5\u30a3\u30eb\u30bf\u30fc\u306e\u6bd4\u8f03<\/a>, \u305d\u308c\u3092\u30d8\u30c3\u30c0\u30fc\u306e\u7d50\u679c\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/mailserveranalyse_nacht_tech8001.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u4fe1\u983c\u3067\u304d\u308b\u30d5\u30a1\u30fc\u30b9\u30c8\u30db\u30c3\u30d7\u3092\u6c7a\u3081\u308b<\/h2>\n\n<p>\u6700\u521d\u306b\u6c7a\u3081\u308b\u306e\u306f <strong>\u53d7\u9818<\/strong>-\u884c\u3092\u6700\u521d\u306e\u4fe1\u983c\u3067\u304d\u308b\u30db\u30c3\u30d7\u3068\u3059\u308b\u3002\u79c1\u81ea\u8eab\u306e\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u304c\u66f8\u3044\u305f\u30a8\u30f3\u30c8\u30ea\u3088\u308a\u4e0a\u306f\u3001\u3059\u3079\u3066\u507d\u9020\u306e\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u3060\u304b\u3089 <em>by=<\/em>-\u5c5e\u6027\u306b\u79c1\u306e\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u30db\u30b9\u30c8\u540d\u3092\u6307\u5b9a\u3057\u3001\u305d\u308c\u4ee5\u4e0a\u306e\u884c\u304c\u79c1\u306e\u7ba1\u7406\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u304b\u3089\u767a\u4fe1\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u7121\u8996\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6539\u3056\u3093\u3055\u308c\u305f\u53d7\u4fe1\u30e9\u30a4\u30f3\u304c\u79c1\u306e\u8a55\u4fa1\u3092\u6b6a\u3081\u308b\u306e\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>\u5c01\u7b52 vs \u898b\u3048\u308b\u9001\u308a\u4e3b<\/h2>\n\n<p>\u3068\u306f\u53b3\u5bc6\u306b\u533a\u5225\u3057\u3066\u3044\u308b\u3002 <strong>\u5c01\u7b52\u306e\u9001\u308a\u4e3b<\/strong> (MAIL FROM\/Return-Path\uff09\u3068\u8868\u793a\u3055\u308c\u308bFrom\u30a2\u30c9\u30ec\u30b9\u3002\u30d5\u30a3\u30fc\u30eb\u30c9 <em>\u9001\u4fe1\u6a5f<\/em> \u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u6280\u8853\u6d3e\u9063\u30b7\u30b9\u30c6\u30e0\u3092\u6559\u3048\u3066\u307b\u3057\u3044\u3001, <em>\u8fd4\u4fe1\u5148<\/em> \u306f\u5fdc\u7b54\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u3053\u308c\u3089\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u5927\u304d\u304f\u7570\u306a\u308b\u5834\u5408\u3001\u79c1\u306f\u8b66\u6212\u3092\u5f37\u3081\u308b\u3002\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306e\u5834\u5408\u306f <em>\u30a8\u30b9\u30a2\u30fc\u30eb\u30a8\u30b9<\/em> (Sender Rewriting Scheme\uff09\uff1aSRS\u30de\u30fc\u30ad\u30f3\u30b0\u306b\u3088\u3063\u3066\u5909\u66f4\u3055\u308c\u305f\u30ea\u30bf\u30fc\u30f3\u30fb\u30d1\u30b9\u306f\u3001\u4e0d\u6b63\u884c\u70ba\u306a\u3057\u306b\u30a8\u30f3\u30c9\u30fb\u30b7\u30b9\u30c6\u30e0\u4e0a\u3067SPF\u5931\u6557\u3092\u8aac\u660e\u3059\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3002\u3055\u3089\u306b\u30a2\u30c9\u30ec\u30b9\u6307\u5b9a(<em>\u30e6\u30fc\u30b6\u30fc\uff0b\u30bf\u30b0<\/em>)\u3092\u5c01\u7b52\u306b\u5165\u308c\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n<h2>ARC\u3001\u8ee2\u9001\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8<\/h2>\n\n<p>\u6b63\u5f53\u306a\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306b\u3064\u3044\u3066\u306f <strong>\u30a2\u30fc\u30af<\/strong>-\u30c1\u30a7\u30fc\u30f3\uff08Authenticated Received Chain\uff09\u3002\u30b9\u30bf\u30f3\u30c7\u30a3\u30f3\u30b0 <em>\u30a2\u30fc\u30af\u30fb\u30b7\u30fc\u30eb<\/em> \u305d\u3057\u3066 <em>ARC\u30e1\u30c3\u30bb\u30fc\u30b8\u7f72\u540d<\/em> \u306b\u65bc\u3044\u3066 <em>\u30d1\u30b9<\/em>, \u79c1\u306f\u3001DMARC\u304c\u6700\u5f8c\u306e\u30db\u30c3\u30d7\u3067\u5931\u6557\u3057\u305f\u3068\u3057\u3066\u3082\u3001\u3082\u3068\u3082\u3068\u6587\u66f8\u5316\u3055\u308c\u3066\u3044\u308bSPF\/DKIM\u306e\u7d50\u679c\u3092\u4fe1\u7528\u3059\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306f\u3057\u3070\u3057\u3070\u30e1\u30fc\u30eb\uff08\u4ef6\u540d\u306e\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3084\u30d5\u30c3\u30bf\u30fc\uff09\u3092\u5909\u66f4\u3059\u308b\u306e\u3067\u3001DKIM\u304c\u58ca\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002. <em>\u30ea\u30b9\u30c8-ID<\/em>, <em>\u30ea\u30b9\u30c8\u914d\u4fe1\u505c\u6b62<\/em> \u3068\u30d0\u30eb\u30af<em>\u512a\u5148\u9806\u4f4d<\/em> \u305d\u3057\u3066\u3001\u305d\u306e\u9038\u8131\u3092\u8aac\u660e\u3057\u3001\u8aa4\u3063\u305f\u5224\u65ad\u3092\u9632\u3050\u3002.<\/p>\n\n<h2>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306e\u8a73\u7d30\uff1aTLS\u3001HELO\/EHLO\u3001DNS<\/h2>\n\n<p>\u3067\u8aad\u3093\u3060\u3002 <strong>\u53d7\u9818<\/strong> \u8f38\u9001\u306e\u8a73\u7d30 <em>ESMTPS\u3068<\/em> \u306fTLS\u3092\u8868\u3057\u3001\u6697\u53f7\u3068\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u542b\u3080\u3053\u3068\u304c\u591a\u3044\u3002\u307e\u305f <em>HELO\/EHLO<\/em>-\u9001\u4fe1\u30b7\u30b9\u30c6\u30e0\u306e\u540d\u524d\u306f\u3001\u9006\u5f15\u304dDNS(<em>PTR<\/em>)\u3001\u305d\u3057\u3066\u7406\u60f3\u7684\u306b\u306fForward-Confirm(A\/AAA)\u3092\u4ecb\u3057\u3066\u540c\u3058IP\u306b\u30de\u30c3\u30c1\u30d0\u30c3\u30af\u3059\u308b\u3002\u79c1\u306b\u3068\u3063\u3066\u3001\u4e00\u822c\u7684\u306arDNS\u3084\u5358\u306a\u308bIP\u3068\u3057\u3066\u306eHELO\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u8a2d\u5b9a\u304c\u4e0d\u5341\u5206\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u6307\u6a19\u3067\u3042\u308b\u3002\u5927\u898f\u6a21\u306a\u9001\u4fe1\u8005\u306f\u4e00\u8cab\u3057\u305f\u30db\u30b9\u30c8\u540d\u30b9\u30ad\u30fc\u30e0\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u3001\u9038\u8131\u306f\u3059\u3050\u306b\u6c17\u3065\u304b\u308c\u308b\u3002.<\/p>\n\n<h2>\u4ed8\u52a0\u4fa1\u5024\u306e\u3042\u308b\u8ffd\u52a0\u30d8\u30c3\u30c0\u30fc<\/h2>\n\n<p>\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u306b\u52a0\u3048 <strong>X\u30d8\u30c3\u30c0\u30fc<\/strong> \u5177\u4f53\u7684\u306b\u306f <em>X-\u30b9\u30d1\u30e0\u72b6\u6cc1<\/em> \u305d\u3057\u3066 <em>X\u30b9\u30d1\u30e0\u30d5\u30e9\u30b0<\/em> \u4e0a\u6d41\u30d5\u30a3\u30eb\u30bf\u30fc\u306e\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u3092\u793a\u3059\u3001, <em>X-\u767a\u4fe1\u5143IP<\/em> \u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u306f\u5b9f\u969b\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8IP\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u3002\u30d2\u30f3\u30c8 <em>X-PHP\u30b9\u30af\u30ea\u30d7\u30c8<\/em> \u306f\u81ea\u524d\u306e\u30d5\u30a9\u30fc\u30e0\u30e1\u30fc\u30e9\u30fc\u3092\u63a8\u5968\u3057\u3066\u3044\u308b\u3002\u4ee5\u4e0b\u306f\u3001\u672c\u683c\u7684\u306a\u5927\u91cf\u30e1\u30fc\u30ea\u30f3\u30b0\u3092\u652f\u6301\u3059\u308b\u610f\u898b\u3067\u3042\u308b\u3002 <em>\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30afID<\/em>, <em>\u30ea\u30b9\u30c8-ID<\/em> \u305d\u3057\u3066 <em>\u30ea\u30b9\u30c8\u914d\u4fe1\u505c\u6b62<\/em>. .\u3082\u3057\u300c\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u300d\u3068\u3055\u308c\u308b\u96fb\u5b50\u30e1\u30fc\u30eb\u304b\u3089\u3053\u308c\u3089\u3059\u3079\u3066\u304c\u6b20\u843d\u3057\u3066\u3044\u308c\u3070\u3001\u79c1\u306f\u3088\u308a\u53b3\u3057\u304f\u5224\u65ad\u3059\u308b\u3002. <em>\u30e1\u30c3\u30bb\u30fc\u30b8ID<\/em> \u79c1\u306f\u5f62\u5f0f\u3068\u30c9\u30e1\u30a4\u30f3\u62e1\u5f35\u5b50\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u975e\u5178\u578b\u7684\u306a\u30c9\u30e1\u30a4\u30f3\u3084\u7a7a\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u76ee\u7acb\u3064\u3002.<\/p>\n\n<h2>MIME\u30ec\u30d9\u30eb\uff1a\u30b3\u30f3\u30c6\u30f3\u30c4\u30bf\u30a4\u30d7\u3001\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u3001\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0<\/h2>\n\n<p>\u3092\u898b\u3066\u307f\u308b\u3002 <strong>MIME\u69cb\u9020<\/strong> \u3078\uff1a 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<em>\u65e5\u4ed8<\/em>-\u30b7\u30b0\u30ca\u30eb\u304c\u672a\u6765\u3084\u306f\u308b\u304b\u904e\u53bb\u306e\u3082\u306e\u3067\u3042\u308b\u5834\u5408\u3001\u591a\u304f\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\u306f\u305d\u308c\u3092\u5426\u5b9a\u7684\u306b\u8a55\u4fa1\u3059\u308b\u3002.<\/p>\n\n<h2>\u30d0\u30a6\u30f3\u30b9\u3068DSN\u306e\u6b63\u78ba\u306a\u8aad\u307f\u53d6\u308a<\/h2>\n\n<p>\u4e0d\u660e\u78ba\u306a\u30ea\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u8a55\u4fa1\u3059\u308b\u3002 <strong>\u914d\u9001\u72b6\u6cc1\u306e\u304a\u77e5\u3089\u305b<\/strong> \u3088\u308a\u3002 <em>\u6700\u7d42\u53d7\u9818\u8005<\/em>, <em>\u30a2\u30af\u30b7\u30e7\u30f3<\/em>, <em>\u30b9\u30c6\u30fc\u30bf\u30b9<\/em> (\u4f8b\uff1a5.7.1\u30dd\u30ea\u30b7\u30fc\uff09\u3068 <em>\u8a3a\u65ad\u30b3\u30fc\u30c9<\/em> 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(<em>\u30a2\u30a4\u30c9\u30eb<\/em>=...).Postfix\u3001Exim\u3001\u307e\u305f\u306fExchange\u306e\u30ed\u30b0\u3067\u3053\u308c\u3089\u3092\u518d\u3073\u898b\u3064\u3051\u308b\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u914d\u4fe1\u6642\u9593\u3001TLS\u30d1\u30e9\u30e1\u30fc\u30bf\u3001\u30d5\u30a3\u30eb\u30bf\u30fc\u30a2\u30af\u30b7\u30e7\u30f3\u3001\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3092\u660e\u78ba\u306b\u8a18\u9332\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30d8\u30c3\u30c0\u30fc\u3092\u5b9f\u969b\u306e\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306e\u554f\u984c\u304b\u3089\u5207\u308a\u96e2\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u306e\u7279\u5225\u306a\u30b1\u30fc\u30b9<\/h2>\n\n<p>\u30d6\u30e9\u30f3\u30c9\u306f\u3057\u3070\u3057\u3070\u3001\u4ee5\u4e0b\u306e\u65b9\u6cd5\u3067\u51fa\u8377\u3057\u3066\u3044\u308b\u3002 <strong>\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0<\/strong>. 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<li>MIME\u69cb\u9020\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3001\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306b\u7570\u5e38\u304c\u306a\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n  <li>\u30db\u30c3\u30d7\u3054\u3068\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3068\u7dcf\u30ec\u30a4\u30c6\u30f3\u30b7\u306e\u59a5\u5f53\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n  <li>\u30d0\u30a6\u30f3\u30b9\u306eDSN\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u8a3a\u65ad\u30b3\u30fc\u30c9\u306e\u512a\u5148\u9806\u4f4d\u4ed8\u3051<\/li>\n  <li>\u30aa\u30d7\u30b7\u30e7\u30f3\u3067MTA\u30ed\u30b0\u3068\u306e\u95a2\u9023\u4ed8\u3051\u3092\u884c\u3044\u3001\u7591\u5ff5\u3092\u89e3\u6d88\u3059\u308b\u3002<\/li>\n<\/ul>\n\n<h2>\u81ea\u5206\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30d8\u30c3\u30c0\u30fc\u89e3\u6790<\/h2>\n\n<p>\u79c1\u306f\u81ea\u5206\u306e\u4f1a\u793e\u3092\u7d4c\u55b6\u3057\u3066\u3044\u308b\u306e\u304b\uff1f <strong>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc<\/strong>, 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<a href=\"https:\/\/webhosting.de\/ja\/dkim-%e6%ad%a3%e8%a6%8f%e5%8c%96-%e7%bd%b2%e5%90%8d-%e5%ae%89%e5%ae%9a%e6%80%a7-%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3\/\">DKIM\u306e\u6b63\u898f\u5316<\/a>, \u504f\u5dee\u3092\u6c7a\u5b9a\u7684\u306b\u6392\u9664\u3059\u308b\u3002.<\/p>\n\n<h2>\u5b9f\u4f8b\uff1a\u4e0d\u5be9\u306a\u8acb\u6c42\u66f8\u30e1\u30fc\u30eb<\/h2>\n\n<p>\u3042\u308b\u30b1\u30fc\u30b9\u3067\u306f\u3001\u8acb\u6c42\u66f8\u30e1\u30fc\u30eb\u306f\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u3060\u3063\u305f\u3002 <strong>\u7d14\u6b63<\/strong> 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width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u8a55\u4fa1\u6642\u306b\u3042\u308a\u304c\u3061\u306a\u30df\u30b9\u3092\u907f\u3051\u308b<\/h2>\n\n<p>\u79c1\u306f\u6c7a\u3057\u30661\u3064\u306b\u983c\u3089\u306a\u3044 <strong>\u4fa1\u5024<\/strong>, 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