{"id":17636,"date":"2026-02-13T18:21:54","date_gmt":"2026-02-13T17:21:54","guid":{"rendered":"https:\/\/webhosting.de\/warum-mailserver-ips-gemeinsam-blacklists-landen-mailfix\/"},"modified":"2026-02-13T18:21:54","modified_gmt":"2026-02-13T17:21:54","slug":"%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%81%aeip%e3%81%8c%e3%83%96%e3%83%a9%e3%83%83%e3%82%af%e3%83%aa%e3%82%b9%e3%83%88%e3%81%aemailfix%e3%81%a7%e4%b8%80%e7%b7%92%e3%81%ab%e3%81%aa","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/warum-mailserver-ips-gemeinsam-blacklists-landen-mailfix\/","title":{"rendered":"\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306eIP\u304c\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u3088\u304f\u4e00\u7dd2\u306b\u8f09\u308b\u7406\u7531"},"content":{"rendered":"<p>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306f\u5171\u6709IP\u3092\u540c\u6642\u306b\u653b\u6483\u3059\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u30b9\u30d1\u30e0\u306e\u9001\u4fe1\u8005\u304c1\u4eba\u3067\u3082\u3044\u308b\u3068\u5171\u6709\u306e\u8a55\u4fa1\u304c\u4e0b\u304c\u308b\u304b\u3089\u3067\u3059\u3002\u5171\u6709\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u74b0\u5883\u3067\u306f <strong>\u9023\u5e2f\u8cac\u4efb<\/strong> \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304cIP\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4e0b\u3052\u308b\u3068\u3001\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u304c\u30d0\u30a6\u30f3\u30b9\u3057\u305f\u308a\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u305f\u308a\u3059\u308b\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li>\u5171\u6709IP\u306f\u96c6\u5408\u4f53\u3092\u751f\u6210\u3059\u308b <strong>\u9023\u5e2f\u8cac\u4efb<\/strong><\/li>\n  <li>\u8a55\u5224\u306e\u826f\u3057\u60aa\u3057\u306f <strong>SPF\/DKIM<\/strong> \u304a\u3088\u3073PTR<\/li>\n  <li>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u5168\u4f53\u3092\u30d6\u30ed\u30c3\u30af <strong>\u30cd\u30c3\u30c4<\/strong> \u8650\u5f85\u306e\u5834\u5408<\/li>\n  <li>\u65e9\u671f\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u4e2d\u6b62 <strong>\u30b9\u30d1\u30e0<\/strong>-\u6ce2<\/li>\n  <li>\u5c02\u7528IP\u306f <strong>\u30ea\u30b9\u30af<\/strong><\/li>\n<\/ul>\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\/02\/mailserver-blacklist-2983.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u306a\u305c\u5171\u6709\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306f\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u4e00\u7dd2\u306b\u8f09\u3063\u3066\u3057\u307e\u3046\u306e\u304b\uff1f<\/h2>\n\n<p>\u5171\u6709\u74b0\u5883\u3067\u306f\u3001\u79c1\u306f\u6b21\u306e\u539f\u5247\u3092\u7406\u89e3\u3057\u3066\u3044\u308b\u3002 <strong>\u9023\u5e2f\u8cac\u4efb<\/strong> \u6700\u3082\u660e\u767d\u306a\u4f8b\u306f\u3001\u591a\u304f\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u540c\u3058IP\u7d4c\u7531\u3067\u9001\u4fe1\u3057\u3066\u304a\u308a\u3001\u305f\u3063\u305f\u4e00\u5ea6\u306e\u4e0d\u624b\u969b\u304c\u5168\u54e1\u306e\u914d\u4fe1\u53ef\u80fd\u6027\u3092\u53f0\u7121\u3057\u306b\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u3067\u3059\u3002\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306f\u3001\u30b9\u30d1\u30e0\u30c8\u30e9\u30c3\u30d7\u3001\u82e6\u60c5\u7387\u3001\u7570\u5e38\u306a\u9001\u4fe1\u30d1\u30bf\u30fc\u30f3\u306a\u3069\u306e\u30b7\u30b0\u30ca\u30eb\u3092\u8a55\u4fa1\u306b\u307e\u3068\u3081\u307e\u3059\u3002\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u3057\u304d\u3044\u5024\u3092\u4e0b\u56de\u308b\u3068\u3001\u53d7\u4fe1\u30b7\u30b9\u30c6\u30e0\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u53d7\u4fe1\u3092\u62d2\u5426\u3057\u305f\u308a\u3001\u30b9\u30d1\u30e0\u306b\u767b\u9332\u3057\u305f\u308a\u3059\u308b\u3002\u3053\u308c\u306f\u3001\u30ea\u30b9\u30c8\u904b\u55b6\u8005\u304c\u500b\u3005\u306e\u9001\u4fe1\u8005\u3067\u306f\u306a\u304fIP\u30d6\u30ed\u30c3\u30af\u3092\u30de\u30fc\u30af\u3059\u308b\u305f\u3081\u3001\u7a81\u7136\u8d77\u3053\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u6df1\u523b\u306a\u9001\u4fe1\u8005\u306b\u3068\u3063\u3066\u306f\u3001\u3053\u308c\u306f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u8106\u5f31\u6027\u304c\u3059\u3079\u3066\u81ea\u5206\u81ea\u8eab\u306e\u8106\u5f31\u6027\u306b\u306a\u308b\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3002 <strong>\u554f\u984c<\/strong>.<\/p>\n\n<h2>\u5171\u6709\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u74b0\u5883\u306b\u304a\u3051\u308b\u9023\u5e2f\u8cac\u4efb\u306e\u660e\u78ba\u306a\u8aac\u660e<\/h2>\n\n<p>\u8106\u5f31\u306a\u30b3\u30f3\u30bf\u30af\u30c8\u30fb\u30d5\u30a9\u30fc\u30e0\u304c\u6570\u6642\u9593\u4ee5\u5185\u306b\u4f55\u5343\u3082\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u3001\u30db\u30b9\u30c8\u5168\u4f53\u304c\u305d\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u7d99\u3050\u3002 <strong>\u7f6a\u60aa\u611f<\/strong>. .\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u305d\u306e\u5730\u57df\u3092\u5371\u967a\u306a\u5730\u57df\u3068\u5206\u985e\u3057\u3001\u30d5\u30a3\u30eb\u30bf\u3092\u5f37\u5316\u3059\u308b\u3002IP\u304c\u5927\u91cf\u30e1\u30fc\u30eb\u9001\u4fe1\u5143\u3068\u898b\u306a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u6b63\u3057\u3044\u53d6\u5f15\u30e1\u30fc\u30eb\u3067\u3055\u3048\u7591\u308f\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u8a55\u5224\u306e\u60aa\u3055\u3084\u4e0d\u6b63\u306aPTR\u30a8\u30f3\u30c8\u30ea\u306b\u8a00\u53ca\u3057\u305f\u30d0\u30a6\u30f3\u30b9\u3092\u3057\u3070\u3057\u3070\u7d4c\u9a13\u3059\u308b\u3002\u8fc5\u901f\u306a\u6839\u672c\u539f\u56e0\u306e\u5206\u6790\u3068\u4e00\u8cab\u3057\u305f\u6539\u5584\u7b56\u304c\u306a\u3051\u308c\u3070\u3001\u5171\u6709IP\u306f\u3059\u3079\u3066\u306e\u4fa1\u5024\u3092\u5931\u3044\u307e\u3059\u3002 <strong>\u30b3\u30f3\u30d5\u30a3\u30c7\u30f3\u30b9\u30fb\u30dc\u30fc\u30ca\u30b9<\/strong>.<\/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\/02\/mailserver_blacklist_meeting_7261.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5178\u578b\u7684\u306a\u304d\u3063\u304b\u3051\uff1a\u30b9\u30d1\u30e0\u304b\u3089PTR\u307e\u3067<\/h2>\n\n<p>\u3067\u59cb\u307e\u308b\u3053\u3068\u304c\u591a\u3044\u3002 <strong>\u30de\u30eb\u30a6\u30a7\u30a2<\/strong>, \u5f31\u3044\u30ed\u30b0\u30a4\u30f3\u3092\u60aa\u7528\u3057\u3001\u4ed6\u4eba\u306eSMTP\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u4e57\u3063\u53d6\u308b\u3002\u307e\u305f\u3001\u30aa\u30fc\u30d7\u30f3\u30d5\u30a9\u30fc\u30e0\u3092\u60aa\u7528\u3057\u3066\u30b9\u30d1\u30e0\u3092\u9001\u4fe1\u3059\u308b\u5b89\u5168\u3067\u306a\u3044\u30d7\u30e9\u30b0\u30a4\u30f3\u3082\u3088\u304f\u898b\u304b\u3051\u308b\u3002\u8a8d\u8a3c\u306e\u6b20\u5982\u3082\u3001\u53d7\u4fe1\u8005\u30b5\u30fc\u30d0\u30fc\u304c\u8eab\u5143\u3092\u78ba\u8a8d\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u4e0d\u4fe1\u611f\u3092\u717d\u308b\u3002\u201eip-203-0-113-7.examplehost.net \u201c\u306e\u3088\u3046\u306a\u4e00\u822c\u7684\u306a\u9006\u5f15\u304dDNS\u306f\u3001\u3055\u3089\u306b\u62d2\u5426\u3092\u8a98\u767a\u3059\u308b\u3002\u3053\u308c\u3089\u306e\u8981\u56e0\u304c\u7a4d\u307f\u91cd\u306a\u308b\u3068\u3001IP\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u5d29\u58ca\u3057\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 <strong>\u30ea\u30b9\u30af<\/strong>-\u30ea\u30b9\u30c8\u306e\u30bd\u30fc\u30b9.<\/p>\n\n<h2>\u8a8d\u8a3c\u306e\u5f79\u5272\uff1aSPF\u3001DKIM\u3001DMARC\u3001PTR<\/h2>\n\n<p>\u79c1\u306f\u3059\u3079\u3066\u306e\u914d\u9001\u30c9\u30e1\u30a4\u30f3\u306b\u4ee5\u4e0b\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002 <strong>SPF<\/strong>, DKIM\u3067\u96fb\u5b50\u30e1\u30fc\u30eb\u306b\u7f72\u540d\u3057\u3001DMARC\u3067\u660e\u78ba\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u5b9f\u65bd\u3059\u308b\u3002\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u507d\u9020\u3092\u3088\u308a\u56f0\u96e3\u306b\u3057\u3001\u53d7\u4fe1\u8005\u306b\u4fe1\u983c\u3067\u304d\u308b\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u63d0\u4f9b\u3059\u308b\u3002\u9001\u4fe1\u8005\u306e\u30db\u30b9\u30c8\u540d\u3092\u6307\u3059\u30af\u30ea\u30fc\u30f3\u306aPTR\u3082\u5fc5\u9808\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u4e00\u90e8\u3067\u3059\u3002\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u8aac\u660e\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 <a href=\"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-bimi%e3%80%81%e6%9c%80%e9%81%a9%e3%81%aa%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e3%83%bb%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%e3%83%bb%e3%83%9e%e3%83%88%e3%83%aa\/\">SFP\u3001DKIM\u3001DMARC<\/a>, \u3053\u308c\u306b\u3088\u308a\u3001\u914d\u4fe1\u4fe1\u53f7\u306f\u4e00\u8cab\u3057\u3066\u30de\u30c3\u30d4\u30f3\u30b0\u3055\u308c\u308b\u3002\u4e00\u65b9\u3001\u8a18\u5165\u6f0f\u308c\u304c\u3042\u3063\u305f\u308a\u3001\u77db\u76fe\u304c\u3042\u3063\u305f\u308a\u3059\u308b\u3068 <strong>\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4<\/strong>.<\/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\/02\/mailserver-blacklist-visualisierung-3891.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306e\u6280\u8853\u7684\u306a\u4ed5\u7d44\u307f<\/h2>\n\n<p>\u30ea\u30b9\u30c8\u6f14\u7b97\u5b50\u3092\u96c6\u3081\u308b <strong>\u4fe1\u53f7<\/strong> \u30b9\u30d1\u30e0\u30c8\u30e9\u30c3\u30d7\u3001\u53d7\u4fe1\u8005\u304b\u3089\u306e\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3001\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u30d5\u30a3\u30eb\u30bf\u30fc\u304b\u3089\u3002\u500b\u3005\u306eIP\u306b\u30d5\u30e9\u30b0\u3092\u7acb\u3066\u308b\u30b5\u30fc\u30d3\u30b9\u3082\u3042\u308c\u3070\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u3084\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u30d6\u30ed\u30c3\u30af\u5168\u4f53\u306b\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u3082\u3042\u308b\u3002\u3053\u306e\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u539f\u7406\u306f\u3001\u306a\u305c\u5171\u8b00\u7f6a\u304c\u983b\u7e41\u306b\u767a\u751f\u3059\u308b\u306e\u304b\u3092\u8aac\u660e\u3057\u3066\u3044\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u5bfe\u7b56\u306e\u512a\u5148\u9806\u4f4d\u3092\u9069\u5207\u306b\u6c7a\u3081\u308b\u305f\u3081\u306b\u3001\u3069\u306e\u30ec\u30d9\u30eb\u304c\u5f71\u97ff\u3092\u53d7\u3051\u308b\u304b\u3092\u5e38\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u3002\u6b21\u306e\u8868\u306f\u3001\u72b6\u6cc1\u3092\u3088\u308a\u65e9\u304f\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u3088\u304f\u3042\u308b\u30bf\u30a4\u30d7\u3001\u539f\u56e0\u3001\u7d50\u679c\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3059\u3002 <strong>\u898b\u7a4d\u3082\u308a<\/strong>:<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u30bf\u30a4\u30d7<\/th>\n      <th>\u4e0a\u5834\u30ec\u30d9\u30eb<\/th>\n      <th>\u3088\u304f\u3042\u308b\u539f\u56e0<\/th>\n      <th>\u76f4\u63a5\u306e\u7d50\u679c<\/th>\n      <th>\u63a8\u5968\u3055\u308c\u308b\u53cd\u5fdc<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>DNSBL\uff08IP\u30d9\u30fc\u30b9\uff09<\/td>\n      <td>\u500b\u4ebaIP<\/td>\n      <td>\u4e0d\u6b63\u30ed\u30b0\u30a4\u30f3<\/td>\n      <td>\u30d0\u30a6\u30f3\u30b9\/\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0<\/td>\n      <td>\u539f\u56e0\u7a76\u660e\u3001\u4e0a\u5834\u5ec3\u6b62\u7533\u8acb<\/td>\n    <\/tr>\n    <tr>\n      <td>AVL\uff08\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\uff09<\/td>\n      <td>\u30b5\u30d6\u30cd\u30c3\u30c8\/\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u7bc4\u56f2<\/td>\n      <td>\u96a3\u4eba\u306b\u3088\u308b\u9023\u5e2f\u8cac\u4efb<\/td>\n      <td>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\u306e\u30d6\u30ed\u30c3\u30af<\/td>\n      <td>IP\u3092\u5909\u66f4\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u885b\u751f\u3092\u9ad8\u3081\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u5185\u90e8<\/td>\n      <td>\u30ec\u30b7\u30fc\u30d0\u30fc\u56fa\u6709<\/td>\n      <td>\u9ad8\u3044\u82e6\u60c5\u7387<\/td>\n      <td>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u56fa\u6709\u306e\u62d2\u5426<\/td>\n      <td>\u30af\u30ea\u30fc\u30f3\u30ea\u30b9\u30c8\u3001\u30b9\u30ed\u30c3\u30c8\u30eb\u958b\u5ea6<\/td>\n    <\/tr>\n    <tr>\n      <td>\u8a55\u5224\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9<\/td>\n      <td>\u30b9\u30b3\u30a2\u30fb\u30d9\u30fc\u30b9<\/td>\n      <td>\u7d2f\u7a4d\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8<\/td>\n      <td>\u6f38\u6e1b<\/td>\n      <td>\u9577\u671f\u7684\u306a\u30dd\u30b8\u30c6\u30a3\u30d6\u30fb\u30b7\u30b0\u30ca\u30eb\u306e\u69cb\u7bc9<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u914d\u4fe1\u3068\u30d3\u30b8\u30cd\u30b9\u3078\u306e\u5f71\u97ff<\/h2>\n\n<p>\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u30c8\u30ea\u30ac\u30fc\u3068\u306a\u3063\u3066\u8868\u793a\u3055\u308c\u308b <strong>\u30d0\u30a6\u30f3\u30b9<\/strong> \u591a\u304f\u306e\u5834\u5408\u3001\u201ePoor Reputation \u201c\u3084 \u201eBad DNS PTR \u201c\u3068\u3044\u3063\u305f\u7c21\u5358\u306a\u901a\u77e5\u3068\u3068\u3082\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30b5\u30a4\u30ec\u30f3\u30c8\u30d5\u30a3\u30eb\u30bf\u30fc\u306f\u3082\u3063\u3068\u5287\u7684\u306a\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\uff1a\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u30b9\u30d1\u30e0\u306e\u4e2d\u3067\u898b\u3089\u308c\u305a\u306b\u7d42\u308f\u308a\u3001\u9001\u4fe1\u8005\u306f\u4f55\u3082\u6c17\u3065\u304d\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u3001\u8acb\u6c42\u66f8\u3001\u53d6\u5f15\u30e1\u30fc\u30eb\u306b\u7b49\u3057\u304f\u5f71\u97ff\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u958b\u5c01\u7387\u306e\u4f4e\u4e0b\u3001\u8cfc\u5165\u306e\u30ad\u30e3\u30f3\u30bb\u30eb\u3001\u30b5\u30dd\u30fc\u30c8\u4f9d\u983c\u306e\u5897\u52a0\u306a\u3069\u3092\u6e2c\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u4ed5\u7d44\u307f\u3084\u30a4\u30f3\u30d5\u30e9\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%83%bb%e3%82%a4%e3%83%b3%e3%83%95%e3%83%a9%e3%82%b9%e3%83%88%e3%83%a9%e3%82%af%e3%83%81%e3%83%a3-abc123\/\">\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u6027<\/a> \u7684\u3092\u7d5e\u3063\u305f\u6280\u8853\u7684\u306a\u8abf\u6574\u3092\u884c\u3044\u3001\u640d\u5931\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u305f\u3081\u306e\u5b9f\u8df5\u7684\u306a\u30aa\u30ea\u30a8\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3002 <strong>\u6e1b\u3089\u3059<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/02\/mailserver_blacklist_nacht_4721.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306e\u30c1\u30a7\u30c3\u30af\uff1a\u79c1\u306f\u3053\u3046\u3057\u3066\u3044\u308b<\/h2>\n\n<p>\u79c1\u306f\u3044\u3064\u3082 <strong>\u30a2\u30a4\u30d4\u30fc<\/strong>, \u30ea\u30b9\u30c8\u306f\u4e3b\u306bIP\u30d9\u30fc\u30b9\u3060\u304b\u3089\u3060\u3002\u6b21\u306b\u3001SPF\u3001DKIM\u3001DMARC\u3001PTR\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u6574\u5408\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u306f\u3001\u4e0d\u6b63\u5229\u7528\u306e\u7a93\u53e3\u3092\u7d5e\u308a\u8fbc\u3080\u305f\u3081\u306b\u3001\u9001\u4fe1\u306e\u30d4\u30fc\u30af\u3068\u8a8d\u8a3c\u30a8\u30e9\u30fc\u306e\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u540c\u6642\u306b\u3001\u5185\u90e8\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u5927\u304d\u304f\u7570\u306a\u308b\u305f\u3081\u3001\u53d7\u4fe1\u8005\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3054\u3068\u306b\u30d0\u30a6\u30f3\u30b9\u306e\u7406\u7531\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002\u539f\u56e0\u304c\u308f\u304b\u3063\u3066\u521d\u3081\u3066\u3001\u30ea\u30b9\u30c8\u89e3\u9664\u51e6\u7406\u3092\u958b\u59cb\u3057\u3001\u660e\u78ba\u306a\u4fee\u6b63\u3092\u884c\u3044\u307e\u3059\u3002 <strong>\u30a8\u30d3\u30c7\u30f3\u30b9<\/strong>.<\/p>\n\n<h2>\u88ab\u5bb3\u8efd\u6e1b\u306e\u305f\u3081\u306e\u512a\u5148\u9806\u4f4d\u30ea\u30b9\u30c8<\/h2>\n\n<p>\u6700\u521d\u306b\u59a5\u5354\u3057\u305f\u306e\u306f <strong>\u30a2\u30ab\u30a6\u30f3\u30c8<\/strong> \u305d\u3057\u3066\u3001\u3053\u308c\u4ee5\u4e0a\u30b9\u30d1\u30e0\u304c\u9001\u4fe1\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u9001\u4fe1\u5236\u9650\u3092\u4e0a\u3052\u308b\u3002\u305d\u308c\u304b\u3089\u53d7\u4fe1\u8005\u30ea\u30b9\u30c8\u3092\u6574\u7406\u3059\u308b\uff1a\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u3001\u30cf\u30fc\u30c9\u30d0\u30a6\u30f3\u30b9\u3001\u82e6\u60c5\u306e\u3042\u308b\u30a2\u30c9\u30ec\u30b9\u306f\u4e00\u8cab\u3057\u3066\u524a\u9664\u3059\u308b\u3002\u7b2c\u4e09\u306b\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u306e\u5f37\u5236\u30ea\u30bb\u30c3\u30c8\u3068\u4e8c\u8981\u7d20\u30ed\u30b0\u30a4\u30f3\u3092\u5b9f\u65bd\u3057\u3001\u65b0\u305f\u306a\u4e57\u3063\u53d6\u308a\u3092\u9632\u3050\u3002\u7b2c\u56db\u306b\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u6599\u91d1\u5236\u9650\u3092\u9075\u5b88\u3059\u308b\u305f\u3081\u3001\u914d\u4fe1\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u305a\u3089\u3059\u3002\u7b2c\u4e94\u306b\u3001\u4fe1\u983c\u3067\u304d\u308b\u8a02\u6b63\u306f\u4e0a\u5834\u5ec3\u6b62\u306e\u8981\u6c42\u306b\u306a\u308a\u3046\u308b\u306e\u3067\u3001\u305d\u306e\u5bfe\u7b56\u3092\u304d\u3061\u3093\u3068\u6587\u66f8\u5316\u3057\u3066\u3044\u308b\u3002 <strong>\u62cd\u8eca\u3092\u304b\u3051\u308b<\/strong>.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/02\/entwicklerdesk_blacklist_2481.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>IP\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7\u3068\u51fa\u8377\u898f\u5f8b<\/h2>\n\n<p>\u65b0\u898fIP\u306f\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb\u306a\u30b9\u30bf\u30fc\u30c8\u3092\u5207\u308b\u3053\u3068\u304c\u591a\u3044\u3002 <strong>\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7<\/strong>\u5c11\u91cf\u3001\u30af\u30ea\u30fc\u30f3\u306a\u30bf\u30fc\u30b2\u30c3\u30c8\u30b0\u30eb\u30fc\u30d7\u3001\u7740\u5b9f\u306a\u5897\u52a0\u3002\u30dd\u30b8\u30c6\u30a3\u30d6\u306a\u30b7\u30b0\u30ca\u30eb\u3092\u65e9\u3044\u6bb5\u968e\u3067\u53ce\u96c6\u3059\u308b\u305f\u3081\u3001\u53d7\u4fe1\u8005\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u9806\u5e8f\u3092\u610f\u8b58\u7684\u306b\u9078\u3093\u3067\u3044\u308b\u3002\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u30b7\u30b9\u30c6\u30e0\u3092\u8a8d\u8b58\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u4ef6\u540d\u3001\u9001\u4fe1\u8005\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u4e00\u8cab\u6027\u3092\u6301\u305f\u305b\u3066\u3044\u308b\u3002\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7\u306f\u7570\u5e38\u5024\u306b\u3088\u3063\u3066\u3059\u3050\u306b\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u308b\u305f\u3081\u3001\u6bce\u65e5\u30d0\u30a6\u30f3\u30b9\u3068\u30b9\u30d1\u30e0\u30e1\u30fc\u30eb\u3092\u76e3\u8996\u3057\u3066\u3044\u308b\u3002\u4e00\u8cab\u3057\u305f\u898f\u5f8b\u306b\u3088\u308a\u3001IP\u306f\u5f90\u3005\u306b\u4fe1\u983c\u3067\u304d\u308b\u3082\u306e\u306b\u5909\u308f\u3063\u3066\u3044\u304f\u3002 <strong>\u30bd\u30fc\u30b9<\/strong>.<\/p>\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3001\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u30fb\u30eb\u30fc\u30d7\u3001\u4e0a\u5834\u5ec3\u6b62<\/h2>\n\n<p>\u79c1\u306f\u53ef\u80fd\u306a\u9650\u308a\u3042\u3089\u3086\u308b\u5834\u6240\u3092\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3059\u308b <strong>\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af<\/strong>-\u82e6\u60c5\u304c\u30ea\u30b9\u30c8\u885b\u751f\u306b\u76f4\u63a5\u6d41\u308c\u8fbc\u3080\u3053\u3068\u3092\u53ef\u80fd\u306b\u3059\u308b\u30eb\u30fc\u30d7\u3002\u81ea\u52d5\u5316\u306b\u3088\u308a\u3001\u82e6\u60c5\u306f\u5373\u5ea7\u306b \u201eDo Not Contact \u201c\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u79c1\u306f\u30ea\u30b9\u30c8\u89e3\u9664\u30d5\u30a9\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u3001\u4fee\u6b63\u3055\u308c\u305f\u539f\u56e0\u3092\u8aac\u660e\u3057\u3001\u8a3c\u62e0\u3068\u3057\u3066\u30ed\u30b0\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u6b63\u771f\u6b63\u9298\u306e\u4fee\u6b63\u304c\u306a\u3051\u308c\u3070\u3001\u3059\u3079\u3066\u306e\u554f\u3044\u5408\u308f\u305b\u306f\u307b\u3068\u3093\u3069\u5f79\u306b\u7acb\u3061\u307e\u305b\u3093\u3002\u305d\u308c\u304c\u3001\u5909\u66f4\u3092\u900f\u660e\u6027\u3092\u3082\u3063\u3066\u6587\u66f8\u5316\u3059\u308b\u7406\u7531\u3067\u3059\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u6982\u8981\u306f\u512a\u5148\u9806\u4f4d\u306e\u6c7a\u5b9a\u306b\u5f79\u7acb\u3061\u3001\u77ed\u3044 <a 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<strong>rDNS<\/strong> \u306f\u3001\u5404\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u9001\u4fe1\u8005IP\u306b\u5bfe\u3057\u3066\u30af\u30ea\u30fc\u30f3\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002EHLO\/HELO\u30db\u30b9\u30c8\u540d\u306f\u3001\u524d\u65b9\uff08A\/AAAA\uff09\u3068\u5f8c\u65b9\uff08PTR\uff09\u3092\u9996\u5c3e\u4e00\u8cab\u3057\u3066\u89e3\u6c7a\u3059\u308b\u5b8c\u5168\u4fee\u98fe\u30c9\u30e1\u30a4\u30f3\u540d\u3067\u3042\u308b\u3002\u30d5\u30a3\u30eb\u30bf\u30fc\u306b\u3088\u3063\u3066\u306f\u3001\u524d\u65b9\u78ba\u8a8d\u3055\u308c\u305frDNS\u3092\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3082\u306e\u3082\u3042\u308b\u3002\u79c1\u306f\u4e00\u822c\u7684\u306a\u30db\u30b9\u30c8\u540d\u3092\u907f\u3051\u3001TLS\u8a3c\u660e\u66f8\u3092\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\u3001\u6700\u65b0\u306e\u6697\u53f7\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002MTA-STS\u3001TLS-RPT\u3001DANE\u306a\u3069\u306e\u8ffd\u52a0\u306e\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30b7\u30b0\u30ca\u30eb\u306f\u3001\u6574\u5099\u3055\u308c\u305f\u30a4\u30f3\u30d5\u30e9\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u305f\u3081\u3001\u4fe1\u983c\u3092\u5f37\u5316\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u3001\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u3001\u30d0\u30a6\u30f3\u30b9\u51e6\u7406\u306e\u6b63\u3057\u3044\u5206\u985e<\/h2>\n\n<p>\u307b\u3068\u3093\u3069\u306e\u5224\u65ad\u306f\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u884c\u308f\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\uff08\u30d8\u30c3\u30c0\u30fc\u30d5\u30ed\u30e0\uff09\u3068\u6280\u8853\u7684\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\uff08\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\uff09\u3092\u660e\u78ba\u306b\u5206\u3051\u3001\u5c02\u7528\u306e\u30d0\u30a6\u30f3\u30b9\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a <strong>\u30d9\u30ea\u30d4\u30fc<\/strong>-\u30d0\u30a6\u30f3\u30b9\u3068\u53d7\u4fe1\u8005\u3054\u3068\u306e\u6b63\u78ba\u306a\u30a8\u30e9\u30fc\u5272\u308a\u5f53\u3066\u3002\u79c1\u306f5xx\u30b3\u30fc\u30c9\u3092\u6700\u7d42\u7684\u306a\u3082\u306e\u3068\u3057\u3066\u6271\u3044\uff08\u305d\u308c\u4ee5\u4e0a\u914d\u4fe1\u3092\u8a66\u307f\u306a\u3044\uff09\u30014xx\u3092\u7406\u7531\u3068\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u56fa\u6709\u306e\u5236\u9650\u306b\u5f93\u3063\u3066\u8a55\u4fa1\u3059\u308b\u3002\u30d0\u30c3\u30af\u30aa\u30d5\u6226\u7565\u3092\u6307\u6570\u95a2\u6570\u7684\u306b\u5b9f\u884c\u3057\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3054\u3068\u306e\u540c\u6642\u63a5\u7d9a\u3092\u5236\u9650\u3059\u308b\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u518d\u8a66\u884c\u305d\u306e\u3082\u306e\u304c\u7570\u5e38\u3068\u307f\u306a\u3055\u308c\u308b\u3053\u3068\u3092\u56de\u907f\u3057\u3066\u3044\u308b\u3002DMARC\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u30c1\u30a7\u30c3\u30af\u30d1\u30b9\u304c\u4e00\u8cab\u3057\u3066\u30dd\u30b8\u30c6\u30a3\u30d6\u306b\u306a\u308b\u3088\u3046\u306b\u3001header-from\u3001DKIM\u30c9\u30e1\u30a4\u30f3\u3001SPF\u53ef\u8996\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u9593\u306e\u6574\u5408\u6027\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u30ea\u30b9\u30af\u8981\u56e0\u3068\u3057\u3066\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3001URL\u3001\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb<\/h2>\n\n<p>IP\u30b7\u30b0\u30ca\u30eb\u306b\u52a0\u3048\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u7279\u5fb4\u3082\u4e00\u5f79\u8cb7\u3063\u3066\u3044\u308b\u3002\u30ea\u30f3\u30af\u30c9\u30e1\u30a4\u30f3\u306f\u4e00\u8cab\u6027\u3092\u4fdd\u3061\uff08\u30b7\u30e7\u30fc\u30c8\u30ca\u30fc\u306f\u4f7f\u308f\u306a\u3044\uff09\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u30da\u30fc\u30b8\u304cHTTPS\u304b\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u306f\u6b63\u3057\u3044\u304b\u3001\u30e2\u30d0\u30a4\u30eb\u8868\u793a\u306f\u304d\u308c\u3044\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u7b2c\u4e09\u8005\u306e\u8a55\u5224\u3092\u5f15\u304d\u7d99\u304c\u306a\u3044\u3088\u3046\u3001\u30d6\u30e9\u30f3\u30c9\u306b\u6e96\u62e0\u3057\u305f\u65b9\u6cd5\u3067\u30c8\u30e9\u30c3\u30ad\u30f3\u30b0\u30fb\u30c9\u30e1\u30a4\u30f3\u3092\u8a2d\u5b9a\u3059\u308b\u3002\u30d0\u30e9\u30f3\u30b9\u306e\u3068\u308c\u305f\u30c6\u30ad\u30b9\u30c8\u5bfe\u753b\u50cf\u306e\u6bd4\u7387\u3001\u6709\u52b9\u306a\u30d7\u30ec\u30fc\u30f3\u30c6\u30ad\u30b9\u30c8\u90e8\u5206\u3001\u6291\u5236\u3055\u308c\u305f\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30d2\u30e5\u30fc\u30ea\u30b9\u30c6\u30a3\u30c3\u30af\u30fb\u30d5\u30a3\u30eb\u30bf\u30fc\u3067\u306e\u30d2\u30c3\u30c8\u3092\u6e1b\u3089\u3059\u3002\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u91cd\u8981\u3067\u306a\u3044\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u6700\u5c0f\u9650\u306e\u30b5\u30a4\u30ba\u3092\u4f7f\u7528\u3059\u308b\u3002DKIM\u30dc\u30c7\u30a3\u306e\u6b63\u898f\u5316\u3068\u5b89\u5b9a\u3057\u305f\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306b\u3088\u308a\u3001\u5c0f\u3055\u306a\u5909\u66f4\u304c\u76ee\u7acb\u3063\u305f\u5dee\u7570\u3068\u3057\u3066\u8a8d\u8b58\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u4ef6\u540d\u3001\u5dee\u51fa\u4eba\u3001\u914d\u4fe1\u505c\u6b62\u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u4e00\u8cab\u6027\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u304c\u3001\u3053\u3053\u3067\u306e\u6700\u5927\u306e\u6b66\u5668\u3068\u306a\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\/02\/mailserver-blacklist-4923.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u8ee2\u9001\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001ARC\/SRS\u306e\u5f79\u5272<\/h2>\n\n<p>\u30d5\u30a9\u30ef\u30fc\u30c9\u306e\u79fb\u7c4d\u306f\u3057\u3070\u3057\u3070\u58ca\u308c\u308b <strong>SPF<\/strong>, \u306a\u305c\u306a\u3089\u3001\u30d5\u30a9\u30ef\u30fc\u30c7\u30a3\u30f3\u30b0\u30b5\u30fc\u30d0\u30fc\u306f\u30aa\u30ea\u30b8\u30ca\u30eb\u30c9\u30e1\u30a4\u30f3\u306eSPF\u306b\u30ea\u30b9\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u30d5\u30a9\u30ef\u30fc\u30c0\u30fc\u306bSRS\u3092\u4f7f\u7528\u3057\u3001\u6b21\u306e\u914d\u9001\u5e97\u3067SPF\u304c\u518d\u3073\u6709\u52b9\u306b\u306a\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3084\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u304c\u30b3\u30f3\u30c6\u30f3\u30c4\uff08\u4ef6\u540d\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3001\u30d5\u30c3\u30bf\u30fc\uff09\u3092\u5909\u66f4\u3059\u308b\u3068\u3001DKIM\u7f72\u540d\u304c\u7121\u52b9\u306b\u306a\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u30c1\u30a7\u30fc\u30f3\u3067\u306f <strong>\u30a2\u30fc\u30af<\/strong>, \u5143\u306e\u8a8d\u8a3c\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u6e21\u3059\u3002\u79c1\u306f\u3001DMARC\u30dd\u30ea\u30b7\u30fc\u3092\u614e\u91cd\u306b\u8a08\u753b\u3059\u308b\u3002\u307e\u305ap=none\u3067\u53ef\u8996\u6027\u3092\u78ba\u4fdd\u3057\u3001\u6b21\u306bp=quarantine\u3092\u7d4c\u7531\u3057\u3066\u3001\u8907\u96d1\u306a\u8ee2\u9001\u30d1\u30b9\u3067\u771f\u306e\u507d\u967d\u6027\u30ea\u30b9\u30af\u306b\u5bfe\u51e6\u3059\u308b\u5834\u5408\u306fp=reject\u306b\u3059\u308b\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u610f\u56f3\u305b\u305a\u306b\u6b63\u5f53\u306a\u30d5\u30ed\u30fc\u3092\u5371\u967a\u306b\u3055\u3089\u3059\u3053\u3068\u306a\u304f\u3001\u53b3\u683c\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u78ba\u4fdd\u3057\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u30dd\u30b9\u30c8\u30de\u30b9\u30bf\u30fc\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u30e9\u30f3\u30d6\u30c3\u30af<\/h2>\n\n<p>\u79c1\u306f\u6b21\u306e\u3088\u3046\u306a\u6a5f\u80fd\u7684\u306a\u30a2\u30c9\u30ec\u30b9\u3092\u8003\u3048\u3066\u3044\u308b\u3002 <em>\u8650\u5f85<\/em> \u305d\u3057\u3066 <em>\u30dd\u30b9\u30c8\u30de\u30b9\u30bf\u30fc\u30a2\u30c3\u30c8<\/em> \u3092\u4f5c\u6210\u3057\u3001\u4e00\u5143\u7684\u306b\u76e3\u8996\u3057\u307e\u3059\u3002\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u306e\u305f\u3081\u306e\u30e9\u30f3\u30d6\u30c3\u30af\u304c\u5b58\u5728\u3059\u308b\uff1a\u8b66\u544a\u3001\u6d3e\u9063\u505c\u6b62\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7279\u5b9a\u3001\u539f\u56e0\u7a76\u660e\u3001\u691c\u8a3c\u6587\u66f8\u5316\u3001\u6642\u5dee\u518d\u30b9\u30bf\u30fc\u30c8\u3002\u6307\u6a19\u306e\u3057\u304d\u3044\u5024\u306f\u3001\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u30fb\u30ec\u30d9\u30eb\u306e\u30c8\u30ea\u30ac\u30fc\u3068\u306a\u308b\uff08\u4f8b\u3048\u3070\u3001\u5927\u898f\u6a21\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u82e6\u60c5\u7387\u304c0.3 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