{"id":19145,"date":"2026-04-18T08:33:38","date_gmt":"2026-04-18T06:33:38","guid":{"rendered":"https:\/\/webhosting.de\/blog-greylisting-vs-whitelisting-mailserver-strategien-filtertech\/"},"modified":"2026-04-18T08:33:38","modified_gmt":"2026-04-18T06:33:38","slug":"%e3%83%96%e3%83%ad%e3%82%b0%e3%82%b0%e3%83%ac%e3%82%a4%e3%83%aa%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e5%af%be%e3%83%9b%e3%83%af%e3%82%a4%e3%83%88%e3%83%aa%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/blog-greylisting-vs-whitelisting-mailserver-strategien-filtertech\/","title":{"rendered":"\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3068\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u6bd4\u8f03\uff1a\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u6700\u9069\u306a\u6226\u7565"},"content":{"rendered":"<p>\u30b0\u30ec\u30a4\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0\u30fb\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0\u306f\u3001\u30b9\u30d1\u30e0\u304c\u843d\u3061\u3001\u6b63\u5f53\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8fc2\u56de\u305b\u305a\u306b\u5c4a\u304f\u3088\u3046\u306b\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u6226\u7565\u306b\u7684\u3092\u7d5e\u308b\u306e\u306b\u5f79\u7acb\u3064\u3002\u5927\u304d\u306a\u30b9\u30d1\u30e0\u8ca0\u8377\u306b\u5bfe\u3057\u3066\u3069\u306e\u3088\u3046\u306b\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3092\u4f7f\u3046\u304b\u3001\u307e\u305f\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u9001\u4fe1\u8005\u306b\u5bfe\u3057\u3066\u3069\u306e\u3088\u3046\u306b\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u3092\u4f7f\u3046\u304b\u3001\u660e\u78ba\u306a\u624b\u9806\u3092\u793a\u3057\u307e\u3059\u3002 <strong>\u96fb\u5b50\u30e1\u30fc\u30eb<\/strong> \u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3068\u8ffd\u52a0\u8a8d\u8a3c\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n<p>\u4ee5\u4e0b\u306e\u4e3b\u8981\u306a\u58f0\u660e\u306f\u3001\u6982\u8981\u3092\u7c21\u5358\u306b\u8aac\u660e\u3057\u3001\u5177\u4f53\u7684\u306a\u30b9\u30c6\u30c3\u30d7\u306e\u67a0\u7d44\u307f\u3092\u793a\u3059\u3082\u306e\u3067\u3042\u308b\u3002.<\/p>\n<ul>\n  <li><strong>\u30b0\u30ea\u30fc\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0<\/strong>\u6700\u521d\u306e\u914d\u4fe1\u3092\u9045\u3089\u305b\u3001\u30dc\u30c3\u30c8\u3092\u5927\u91cf\u306b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/li>\n  <li><strong>\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8<\/strong>\u5b9a\u7fa9\u3055\u308c\u305f\u30bd\u30fc\u30b9\u306e\u307f\u3092\u8a31\u53ef\u3057\u3001\u6700\u5927\u9650\u306e\u5236\u5fa1\u3092\u884c\u3046<\/li>\n  <li><strong>\u30b3\u30f3\u30d3\u30cd\u30fc\u30b7\u30e7\u30f3<\/strong>\u307e\u305a\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3001\u6b21\u306bVIP\u5411\u3051\u306e\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8<\/li>\n  <li><strong>\u8a8d\u8a3c<\/strong>SPF\u3001DKIM\u3001DMARC\u3001rDNS<\/li>\n  <li><strong>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/strong>\u30ed\u30b0\u3001\u914d\u9054\u7387\u3001\u9045\u5ef6<\/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\/04\/mailserver-strategien-4729.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30b0\u30ec\u30a4\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u7c21\u5358\u306a\u8aac\u660e\uff1a\u884c\u52d5\u91cf\u306f\u91cf\u306b\u52dd\u308b<\/h2>\n\n<p>\u983c\u308a\u306b\u3057\u3066\u3044\u308b\u306e\u306f <strong>\u30b0\u30ea\u30fc\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0<\/strong>, \u306a\u305c\u306a\u3089SMTP\u306e\u52d5\u4f5c\u3092\u60aa\u7528\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3042\u308b\uff1a\u4e0d\u660e\u306a\u9001\u4fe1\u8005\u306f\u307e\u305a\u3001\u201e451 Temporary Failure \u201c\u306e\u3088\u3046\u306a\u4e00\u6642\u7684\u306a4xx\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u53d6\u308b\u3002\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u306f\u3001\u6570\u5206\u5f8c\u306b\u81ea\u52d5\u518d\u8a66\u884c\u304c\u884c\u308f\u308c\u3001\u672c\u7269\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306f\u3053\u308c\u3092\u6b63\u3057\u304f\u5b9f\u884c\u3059\u308b\u3002\u30b9\u30d1\u30e0\u30dc\u30c3\u30c8\u306f\u30b9\u30d4\u30fc\u30c9\u3068\u91cf\u306b\u7279\u5316\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3057\u3070\u3057\u3070\u4e2d\u65ad\u3057\u3001\u518d\u9001\u4fe1\u3059\u308b\u3053\u3068\u306f\u307b\u3068\u3093\u3069\u3042\u308a\u307e\u305b\u3093\u3002\u5b9f\u969b\u306b\u306f\u3001\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306f\u30b9\u30d1\u30e0\u306e\u91cf\u3092\u5927\u5e45\u306b\u6e1b\u3089\u3057\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u8ca0\u8377\u3092\u9855\u8457\u306b\u8efd\u6e1b\u3059\u308b\u3002\u79c1\u306f\u5e38\u306b\u30b0\u30ec\u30a4\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0\u3068\u8a8d\u8a3c\u3092\u7d44\u307f\u5408\u308f\u305b\u3001\u6700\u521d\u306e\u30b3\u30f3\u30bf\u30af\u30c8\u306e\u5f8c\u3001\u826f\u3044\u30e1\u30fc\u30eb\u304c\u6469\u64e6\u306a\u304f\u5c4a\u304f\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u30b9\u30d1\u30e0<\/strong> \u30c9\u30a2\u306b\u8db3\u3092\u8e0f\u307f\u5165\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002.<\/p>\n\n<h2>\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u660e\u78ba\u306a\u5b9a\u7fa9\u52aa\u529b\u306b\u3088\u308b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb<\/h2>\n\n<p>\u6642\u70b9\u3067\u306f <strong>\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8<\/strong> \u627f\u8a8d\u3055\u308c\u305f\u9001\u4fe1\u8005\u3001\u30c9\u30e1\u30a4\u30f3\u307e\u305f\u306fIP\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u308c\u4ee5\u5916\u306f\u4e00\u8cab\u3057\u3066\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3002\u3053\u306e\u65b9\u6cd5\u306f\u3001\u6c7a\u6e08\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3084\u793e\u5185\u30b7\u30b9\u30c6\u30e0\u3001\u91cd\u8981\u306a\u30d1\u30fc\u30c8\u30ca\u30fc\u306a\u3069\u3001\u91cd\u8981\u306a\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u30fb\u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u9069\u3057\u3066\u3044\u308b\u3002\u6b20\u70b9\u306f\u3001\u65b0\u3057\u3044\u9023\u7d61\u5148\u304c\u30e1\u30fc\u30eb\u3092\u901a\u904e\u3055\u305b\u308b\u524d\u306b\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u5fc5\u8981\u306a\u305f\u3081\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306b\u624b\u9593\u304c\u304b\u304b\u308b\u3053\u3068\u3060\u3002\u305d\u3053\u3067\u79c1\u306f\u3001\u76f4\u611f\u3067\u306f\u306a\u304f\u3001\u6a5f\u80fd\u3068\u30ea\u30b9\u30af\u306b\u5fdc\u3058\u3066\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u3092\u69cb\u6210\u3057\u3066\u3044\u308b\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u7121\u99c4\u306e\u306a\u3044\u30ea\u30b9\u30c8\u3092\u7dad\u6301\u3057\u3001\u30ae\u30e3\u30c3\u30d7\u3092\u907f\u3051\u3001\u4ee5\u4e0b\u3092\u78ba\u5b9f\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0<\/strong>-\u65b0\u3057\u3044\u30b3\u30f3\u30bf\u30af\u30c8\u3092\u4e0d\u5fc5\u8981\u306b\u5931\u3046\u3053\u3068\u306a\u304f\u3001\u30d1\u30b9\u30dd\u30a4\u30f3\u30c8\u3092\u7372\u5f97\u3067\u304d\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\/04\/mailserver_strategien_meeting_7894.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30b0\u30ec\u30fc\u30ea\u30b9\u30c8\u3068\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u6bd4\u8f03\uff1a\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u4e3b\u8981\u6570\u5024\u3067\u306e\u6bd4\u8f03<\/h2>\n\n<p>\u6c7a\u65ad\u3092\u4e0b\u3059\u969b\u3001\u79c1\u306f\u4e21\u65b9\u306e\u65b9\u6cd5\u306e\u52b9\u679c\u3001\u52b4\u529b\u3001\u9045\u5ef6\u3001\u30ea\u30b9\u30af\u3092\u691c\u8a0e\u3059\u308b\u3002\u6b21\u306e\u8868\u306f\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3001\u79c1\u304c\u3069\u306e\u30c4\u30fc\u30eb\u3092\u6700\u521d\u306b\u4f7f\u3046\u304b\u3092\u793a\u3057\u3066\u3044\u308b\u3002\u79c1\u306f\u4e21\u8005\u306e\u9577\u6240\u3092\u5229\u7528\u3057\u3001\u77ed\u6240\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u72d9\u3044\u6483\u3061\u3057\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u30b9\u30d1\u30e0\u3092\u5f37\u529b\u306b\u653b\u6483\u3057\u3001\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u3092\u7d20\u65e9\u304f\u901a\u904e\u3055\u305b\u308b\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u660e\u78ba\u306a\u898b\u89e3 <strong>\u4e3b\u306a\u6570\u5b57<\/strong> \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u9078\u629e\u3092\u52a0\u901f\u3055\u305b\u308b\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30a2\u30b9\u30da\u30af\u30c8<\/th>\n      <th>\u30b0\u30ea\u30fc\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0<\/th>\n      <th>\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u30a2\u30d7\u30ed\u30fc\u30c1<\/td>\n      <td>\u65b0\u3057\u3044\u9001\u4fe1\u8005\u304c\u4e00\u6642\u7684\u306b\u62d2\u5426\u3055\u308c\u307e\u3057\u305f\uff084xx\uff09\u3002<\/td>\n      <td>\u660e\u793a\u7684\u306b\u8a31\u53ef\u3055\u308c\u305f\u9001\u4fe1\u8005\/\u30c9\u30e1\u30a4\u30f3\/IP\u306e\u307f\u304c\u901a\u904e\u3059\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30b9\u30d1\u30e0\u524a\u6e1b<\/td>\n      <td>\u6700\u521d\u306e\u63a5\u89e6\u3067\u30dc\u30c3\u30c8\u304c\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u305f\u3081\u3001\u975e\u5e38\u306b\u9ad8\u3044<\/td>\n      <td>\u53b3\u3057\u3044\u30d7\u30ec\u30ea\u30ea\u30fc\u30b9\u306e\u305f\u3081\u975e\u5e38\u306b\u9ad8\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>\u652f\u51fa<\/td>\n      <td>\u4f4e\u3044\u904b\u8ee2\u30b3\u30b9\u30c8\u3001\u5c11\u306a\u3044\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9<\/td>\n      <td>\u30ea\u30b9\u30c8\u7dad\u6301\u306e\u305f\u3081\u4e2d\uff5e\u9ad8<\/td>\n    <\/tr>\n    <tr>\n      <td>\u9045\u5ef6<\/td>\n      <td>\u30d5\u30a1\u30fc\u30b9\u30c8\u30e1\u30fc\u30eb\uff1a\u901a\u5e385\uff5e15\u5206<\/td>\n      <td>\u8a8d\u53ef\u3055\u308c\u305f\u30c8\u30e9\u30f3\u30b9\u30df\u30c3\u30bf\u30fc\u306f\u9045\u5ef6\u306a\u3057<\/td>\n    <\/tr>\n    <tr>\n      <td>\u67d4\u8edf\u6027<\/td>\n      <td>\u914d\u9001\u884c\u52d5\u3078\u306e\u9ad8\u3044\u9069\u5fdc\u6027<\/td>\n      <td>\u7ba1\u7406\u3055\u308c\u305f\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u9650\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30d9\u30b9\u30c8\u30e6\u30fc\u30b9<\/td>\n      <td>\u5927\u91cf\u306e\u30b9\u30d1\u30e0\u306b\u5bfe\u3059\u308b\u4e00\u822c\u7684\u306a\u30b9\u30d1\u30e0\u5bfe\u7b56<\/td>\n      <td>\u30bc\u30ed\u30fb\u30c8\u30ec\u30e9\u30f3\u30b9\u306e\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u30fb\u30d1\u30b9<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\uff1a\u30e9\u30d5\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u6d3b\u6027\u5316<\/h2>\n\n<p>\u79c1\u306f\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3092\u30ea\u30b9\u30c8\u306e\u4e00\u756a\u4e0a\u306b\u7f6e\u304d\u3001\u4e0d\u5be9\u306a\u6700\u521d\u306e\u30b3\u30f3\u30bf\u30af\u30c8\u306f\u5b9f\u969b\u306e\u30b5\u30fc\u30d0\u30fc\u306e\u6319\u52d5\u304c\u660e\u3089\u304b\u306b\u306a\u308b\u307e\u3067\u5f85\u3064\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u767a\u5238\u3001\u652f\u6255\u3044\u30d5\u30ed\u30fc\u3001SSO\u30e1\u30fc\u30eb\u304c\u6ede\u308a\u306a\u304f\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u3001\u3088\u304f\u7ba1\u7406\u3055\u308c\u305f\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u3092\u4f7f\u3063\u3066\u3001\u30d7\u30ed\u30bb\u30b9\u4e0a\u91cd\u8981\u306a\u9001\u4fe1\u8005\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u65e2\u77e5\u306e\u9055\u53cd\u8005\u3092\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u3067\u30d6\u30ed\u30c3\u30af\u3057\u3001\u30b9\u30d1\u30e0\u30b9\u30b3\u30a2\u30ea\u30f3\u30b0\u3092\u4f7f\u7528\u3057\u3066\u6b63\u78ba\u306a\u8a55\u4fa1\u3092\u52a0\u3048\u307e\u3059\u3002\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308a\u3001\u79c1\u306f\u5f37\u529b\u306a <strong>\u30b9\u30d1\u30e0<\/strong> \u4fdd\u8b77\u3057\u3001\u5dfb\u304d\u6dfb\u3048\u88ab\u5bb3\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u307e\u3059\u3002\u3088\u308a\u6df1\u3044\u51fa\u767a\u70b9\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u6587\u8108\u306b\u304a\u3051\u308bgreylisting\u306e\u826f\u3044\u5165\u9580\u66f8\u3092\u3053\u3053\u3067\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a <a href=\"https:\/\/webhosting.de\/ja\/greylisting-%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-%e3%82%b9%e3%83%91%e3%83%a0%e5%af%be%e7%ad%96-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-serverboost\/\">\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3067greylisting\u3092\u4f7f\u7528\u3059\u308b<\/a>.<\/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\/04\/email-strategies-grey-whitelist-4582.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>Postfix\u3084Exim\u306e\u8a2d\u5b9a\uff1a\u5b9f\u8df5\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1<\/h2>\n\n<p>\u79c1\u306f\u3001Postfix\u306ePostgrey\u306e\u3088\u3046\u306a\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u30b5\u30fc\u30d3\u30b9\u3092\u958b\u59cb\u3057\u3001SMTP\u30c1\u30a7\u30c3\u30af\u306e\u521d\u671f\u306b\u914d\u7f6e\u3059\u308b\u306e\u304c\u597d\u304d\u3060\u3002\u9001\u4fe1\u8005IP\u3001\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3001\u53d7\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u306e\u30c8\u30ea\u30d7\u30ec\u30c3\u30c8\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u7e70\u308a\u8fd4\u3057\u304c\u65b0\u305f\u306b\u505c\u6b62\u3059\u308b\u3053\u3068\u306a\u304f\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3002\u79c1\u306f\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u7528\u306b\u5225\u306e\u30d5\u30a1\u30a4\u30eb\u3084\u30dd\u30ea\u30b7\u30fc\u3092\u5b9a\u7fa9\u3057\u3001\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3084\u76e3\u67fb\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002ACL\u306f\u307e\u305a\u8a8d\u8a3c\u3068\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u305d\u308c\u304b\u3089\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u30eb\u30fc\u30eb\u304c\u6709\u52b9\u306b\u306a\u308b\u3002\u3060\u304b\u3089 <strong>\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3<\/strong> \u306f\u3063\u304d\u308a\u3068\u5224\u8aad\u3067\u304d\u3001\u30a8\u30e9\u30fc\u306f\u3059\u3050\u306b\u30ed\u30b0\u306b\u8868\u793a\u3055\u308c\u308b\u3002.<\/p>\n\n<p>Postfix\u3067\u306f\u3001\u30dd\u30ea\u30b7\u30fc\u30af\u30a8\u30ea\u3092smtpd_recipient_restrictions\u307e\u305f\u306fsmtpd_client_restrictions\u306b\u7f6e\u304d\u3001\u65e9\u671f\u306b\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u3092\u597d\u3080\u3002Postgrey\u306e\u5834\u5408\u3001\u6709\u7528\u306a\u958b\u59cb\u5024\u306f\u3001\u4f8b\u3048\u3070300-600\u79d2\u306e\u9045\u5ef6\u300130\u65e5\u306e\u81ea\u52d5\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u9593\u9694\u3001\u518d\u8d77\u52d5\u306b\u8010\u3048\u308b\u6c38\u7d9a\u30ad\u30e3\u30c3\u30b7\u30e5\u3067\u3059\u3002IP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff08\u6c7a\u6e08\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306a\u3069\uff09\u3001SPF\/DKIM\u304c\u5b89\u5b9a\u3057\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\uff08SSO\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306a\u3069\uff09\u3001\u5185\u90e8\u30b7\u30b9\u30c6\u30e0\u3002Exim\u3067\u306f\u3001\u307e\u305a\u8a8d\u8a3c\u7d50\u679c\uff08SPF\u3001DKIM\u3001DMARC\uff09\u3092\u8a55\u4fa1\u3057\u3001\u6b21\u306b\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3092\u9069\u7528\u3057\u3001\u305d\u306e\u5f8c\u306b\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u4f8b\u5916\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3088\u3046\u306bACL\u3092\u69cb\u6210\u3057\u3066\u3044\u308b\u3002\u3053\u306e\u9806\u5e8f\u306b\u3088\u3063\u3066\u56de\u308a\u9053\u3092\u907f\u3051\u3001\u8aa4\u3063\u305f\u5224\u65ad\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>\u8a8d\u8a3c\uff1aSPF\u3001DKIM\u3001DMARC\u3001rDNS\u3092\u5fc5\u9808\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3059\u308b\u3002<\/h2>\n\n<p>\u79c1\u306f\u30d5\u30a3\u30eb\u30bf\u30fc\u3060\u3051\u306b\u983c\u3089\u305a\u3001ID\u3084\u914d\u4fe1\u30eb\u30fc\u30c8\u3082\u6280\u8853\u7684\u306b\u78ba\u4fdd\u3057\u3066\u3044\u308b\u3002SPF\u306f\u9001\u4fe1\u3092\u8a31\u53ef\u3055\u308c\u305f\u30db\u30b9\u30c8\u3092\u6c7a\u5b9a\u3057\u3001DKIM\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u7f72\u540d\u3057\u3001DMARC\u306f\u660e\u78ba\u306a\u30dd\u30ea\u30b7\u30fc\u3067\u4e21\u8005\u3092\u30ea\u30f3\u30af\u3059\u308b\u3002\u30ea\u30d0\u30fc\u30b9DNS\uff08PTR\uff09\u306f\u3001IP\u3068\u30db\u30b9\u30c8\u540d\u3092\u76ee\u306b\u898b\u3048\u308b\u5f62\u3067\u30ea\u30f3\u30af\u3057\u3001\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u5f37\u5316\u3057\u3001\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u3088\u308a\u30af\u30ea\u30fc\u30f3\u306b\u6a5f\u80fd\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002rDNS\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308c\u3070\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u62d2\u5426\u306f\u660e\u3089\u304b\u306b\u5c11\u306a\u304f\u306a\u308a\u307e\u3059\u3002PTR\u3068co.\u306e\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u306e\u8aac\u660e\u306f\u3001\u3042\u306a\u305f\u304c\u59cb\u3081\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\uff1a <a href=\"https:\/\/webhosting.de\/ja\/%e9%80%86%e5%bc%95%e3%81%8ddns-ptr%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%89-%e3%83%a1%e3%83%bc%e3%83%ab%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-%e8%aa%8d%e8%a8%bc%e3%83%a1%e3%83%bc%e3%83%ab\/\">rDNS\u3068PTR\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b<\/a> \u3088\u308a\u826f\u3044 <strong>\u914d\u9054\u53ef\u80fd\u6027<\/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\/04\/mailserver_strategien_6521.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u9045\u5ef6\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u306e\u5fae\u8abf\u6574<\/h2>\n\n<p>\u5f85\u3061\u6642\u9593\u306f\u3042\u307e\u308a\u9577\u304f\u306a\u304f\u30015\u5206\u304b\u308910\u5206\u7a0b\u5ea6\u3092\u9078\u3073\u3001\u6642\u9593\u304c\u91cd\u8981\u306a\u30d7\u30ed\u30bb\u30b9\u3092\u4fdd\u8b77\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u30d1\u30b9\u30ef\u30fc\u30c9\u306e\u30ea\u30bb\u30c3\u30c8\u3084\u6ce8\u6587\u306e\u78ba\u8a8d\u304c\u9593\u9aea\u5165\u308c\u305a\u306b\u5c4a\u304f\u3088\u3046\u306b\u3001VIP\u306e\u9001\u4fe1\u8005\u3092\u76f4\u63a5\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306b\u8ffd\u52a0\u3057\u3066\u3044\u308b\u3002IP\u304c\u5909\u5316\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u306b\u3064\u3044\u3066\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u30d9\u30fc\u30b9\u306e\u30eb\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3001SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u6b63\u5f53\u306a\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u53d7\u3051\u5165\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002\u30ed\u30b0\u3092\u898b\u308c\u3070\u3001\u3069\u306e\u9001\u4fe1\u8005\u304c\u7e70\u308a\u8fd4\u3057\u5f15\u3063\u304b\u304b\u308b\u304b\u304c\u308f\u304b\u308b\u306e\u3067\u3001\u8ff7\u3046\u3053\u3068\u306a\u304f\u30eb\u30fc\u30eb\u3092\u8abf\u6574\u3057\u3066\u3044\u308b\u3002\u3053\u308c\u306b\u3088\u308a <strong>\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc<\/strong> \u5c0f\u898f\u6a21\u3067\u3001\u4fdd\u8b77\u7387\u306f\u9ad8\u3044\u307e\u307e\u3060\u3002.<\/p>\n\n<p>\u6700\u521d\u306e\u30d2\u30c3\u30c8\u306f\u3001\u5b9a\u7fa9\u3055\u308c\u305f\u6709\u52b9\u671f\u9593\uff08\u4f8b\u3048\u307030\u301c90\u65e5\uff09\u306e\u81ea\u52d5\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306b\u7f6e\u304b\u308c\u308b\u3002\u30ea\u30d4\u30fc\u30c8\u914d\u4fe1\u306b\u6210\u529f\u3059\u308b\u3068\u3001\u3053\u306e\u671f\u9593\u304c\u5ef6\u9577\u3055\u308c\u308b\u3002\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u3084\u5927\u898f\u6a21\u306aSaaS\u306e\u9001\u4fe1\u8005\u306b\u3064\u3044\u3066\u306f\u3001\u9001\u4fe1\u8005IP\u304c\u983b\u7e41\u306b\u5909\u66f4\u3055\u308c\u308b\u304c\u8a8d\u8a3c\u304c\u5b89\u5b9a\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3088\u308a\u5e83\u7bc4\u306a\u30c8\u30ea\u30d7\u30ec\u30c3\u30c8\u30de\u30c3\u30c1\u30f3\u30b0\uff08\u30b5\u30d6\u30cd\u30c3\u30c8\u306e\u96c6\u7d04\u306a\u3069\uff09\u3092\u53d7\u3051\u5165\u308c\u308b\u3053\u3068\u3082\u3042\u308b\u3002\u91cd\u8981\uff1a\u4e00\u6642\u7684\u306a\u7c21\u7565\u5316\u304c\u6052\u4e45\u7684\u306a\u629c\u3051\u7a74\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u4f8b\u5916\u3092\u6587\u66f8\u5316\u3057\u3001\u5b9a\u671f\u7684\u306b\u518d\u8a55\u4fa1\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u81ea\u52d5\u5316\u3068\u30af\u30ea\u30fc\u30f3\u30d7\u30ed\u30bb\u30b9<\/h2>\n\n<p>\u79c1\u306f\u3001\u624b\u4f5c\u696d\u306b\u3088\u308b\u4ecb\u5165\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3001API\u7d4c\u7531\u307e\u305f\u306fCRM\u304b\u3089\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u4f9b\u7d66\u3059\u308b\u3053\u3068\u3092\u597d\u3093\u3067\u3044\u307e\u3059\u3002\u65b0\u3057\u3044\u30d3\u30b8\u30cd\u30b9\u30fb\u30d1\u30fc\u30c8\u30ca\u30fc\u306f\u3001\u307e\u305a\u4e00\u6642\u7684\u306a\u8a8d\u8a3c\u306b\u3068\u3069\u3081\u3001\u77ed\u671f\u9593\u306e\u89b3\u5bdf\u671f\u9593\u306e\u5f8c\u3001\u6052\u4e45\u7684\u306a\u30ea\u30b9\u30c8\u306b\u79fb\u52d5\u3059\u308b\u3002\u79c1\u306f\u5b9a\u671f\u7684\u306b\u96e2\u8131\u8005\u3092\u524a\u9664\u3057\u3001\u30d2\u30c3\u30c8\u30ea\u30b9\u30c8\u306b\u7121\u99c4\u304c\u306a\u304f\u3001\u7121\u79e9\u5e8f\u306a\u5897\u52a0\u304c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u3059\u3067\u306b\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u7ba1\u7406\u8005\u306e\u65b9\u306f\u3001\u3053\u3061\u3089\u306e\u624b\u9806\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\uff1a <a href=\"https:\/\/webhosting.de\/ja\/%e3%82%b9%e3%83%91%e3%83%a0%e3%83%95%e3%82%a3%e3%83%ab%e3%82%bf%e3%83%bc%e3%81%ae%e8%a8%ad%e5%ae%9a%e4%bf%9d%e8%ad%b7%e3%82%82%e5%90%ab%e3%82%80\/\">\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u8ce2\u304f\u8a2d\u5b9a\u3059\u308b<\/a> \u3068\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306e\u30eb\u30fc\u30eb\u304c\u304d\u3061\u3093\u3068\u7d71\u5408\u3055\u308c\u3066\u3044\u308b\u3002\u660e\u78ba\u306a <strong>\u65b9\u91dd<\/strong> \u9001\u4fe1\u8005\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306e\u30e9\u30f3\u30c0\u30e0\u306a\u6c7a\u5b9a\u3092\u907f\u3051\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\/04\/mailserver_strategien_7483.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3068\u6e2c\u5b9a\u57fa\u6e96\uff1a\u6bce\u65e5\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u6570\u5024<\/h2>\n\n<p>\u79c1\u306f\u914d\u4fe1\u7387\u3001\u30d5\u30a1\u30fc\u30b9\u30c8\u30b3\u30f3\u30bf\u30af\u30c8\u306e\u9045\u5ef6\u3001\u30d0\u30a6\u30f3\u30b9\u7387\u3001\u30b9\u30d1\u30e0\u306e\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u3092\u8abf\u3079\u307e\u3059\u3002\u30ed\u30b0\u306b\u9855\u8457\u306a\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308b\u5834\u5408\u3001\u30eb\u30fc\u30eb\u306e\u8a2d\u5b9a\u306b\u8aa4\u308a\u304c\u3042\u308b\u304b\u3001DNS\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u8aa4\u308a\u304c\u3042\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u79c1\u306f\u5f90\u3005\u306b\u5909\u66f4\u3092\u52a0\u3048\u3001\u8abf\u6574\u524d\u3068\u8abf\u6574\u5f8c\u306e\u4e3b\u8981\u306a\u6570\u5024\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u660e\u78ba\u306a\u9031\u6b21\u30ec\u30dd\u30fc\u30c8\u306b\u3088\u308a\u3001\u30c1\u30fc\u30e0\u306b\u60c5\u5831\u3092\u63d0\u4f9b\u3057\u3001\u554f\u984c\u767a\u751f\u6642\u306e\u5bfe\u5fdc\u6642\u9593\u3092\u77ed\u7e2e\u3057\u307e\u3059\u3002\u3053\u306e <strong>\u6307\u6a19<\/strong> \u64cd\u4f5c\u3092\u78ba\u5b9f\u306b\u3057\u3001\u6b7b\u89d2\u3092\u9632\u3050\u3002.<\/p>\n\n<p>\u79c1\u306f\u307e\u305f\u3001\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u95a2\u9023\u306e\u9045\u5ef6\u306e\u5272\u5408\u3001\u914d\u4fe1\u307e\u3067\u306e\u5e73\u5747\u518d\u8a66\u884c\u6642\u9593\u3001\u9045\u5ef6\u30ad\u30e5\u30fc\u306e\u30b5\u30a4\u30ba\u3068\u5e74\u9f62\u3001\u81ea\u52d5\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u30d2\u30c3\u30c8\u306e\u5272\u5408\u3001\u8a66\u884c\u5931\u6557\u5f8c\u306e\u4e0a\u4f4d\u9001\u4fe1\u8005\u3092\u76e3\u8996\u3057\u3066\u3044\u308b\u3002\u9045\u5ef6\u30ad\u30e5\u30fc\u304c\u4e88\u671f\u305b\u305a\u5897\u52a0\u3057\u305f\u308a\u3001\u518d\u8a66\u884c\u6210\u529f\u306e\u5272\u5408\u304c\u4f4e\u4e0b\u3057\u305f\u5834\u5408\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u969c\u5bb3\u304b\u30eb\u30fc\u30eb\u304c\u53b3\u3057\u3059\u304e\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u5185\u90e8\u3068\u5916\u90e8\u306e\u91cd\u8981\u306a\u6570\u5024\u3092\u5206\u3051\u3066\u3001\u539f\u56e0\u3092\u3059\u3050\u306b\u7279\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u3064\u307e\u305a\u304d\u3092\u907f\u3051\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u6c17\u3065\u3044\u305f\u3053\u3068<\/h2>\n\n<p>SPF\u304c\u9069\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u9001\u4fe1\u8005IP\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u3068\u3001\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u767b\u9332\u3067\u4e0d\u5fc5\u8981\u306a\u5f85\u3061\u6642\u9593\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u9001\u4fe1\u8005\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3092\u6ce8\u610f\u6df1\u304f\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30e1\u30ea\u30c3\u30c8\u304c\u660e\u3089\u304b\u306a\u5834\u5408\u306b\u306e\u307f\u4f8b\u5916\u3092\u8a2d\u3051\u3066\u3044\u308b\u3002\u904e\u8ca0\u8377\u306e\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306f\u3059\u3050\u306b\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306b\u306a\u308b\u3002rDNS\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u6b20\u3051\u3066\u3044\u308b\u3068\u3001\u9001\u4fe1\u8005\u304c\u6b63\u5f53\u3067\u3042\u3063\u3066\u3082\u62d2\u5426\u3055\u308c\u308b\u3002\u660e\u78ba\u306a <strong>\u30eb\u30fc\u30eb<\/strong> \u3053\u308c\u3089\u306e\u7f60\u306f\u4e00\u6b69\u305a\u3064\u6d88\u3048\u3066\u3044\u304f\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\/04\/mailserver-strategien-7685.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30dc\u30fc\u30c0\u30fc\u30e9\u30a4\u30f3\u30b1\u30fc\u30b9\u3068\u30d5\u30a9\u30ef\u30fc\u30c7\u30a3\u30f3\u30b0\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30bf\u30fc\u3001SRS\u3001ARC<\/h2>\n<p>\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3068\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30bf\u30fc\u306f\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u3067\u3042\u308b\u3002SPF\u306f\u30b8\u30e3\u30f3\u30d7\u306e\u5f8c\u3067\u3057\u3070\u3057\u3070\u58ca\u308c\u3001DMARC\u306f\u5931\u6557\u3057\u3001\u3053\u308c\u306fgreylisting\u306e\u6c7a\u5b9a\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u8ee2\u9001\u30b5\u30fc\u30d0\u30fc\u304cSRS\uff08Sender Rewriting Scheme\uff09\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308c\u3070\u3001SPF\u3068Envelope From\u306f\u518d\u3073\u6b63\u3057\u304f\u306a\u308b\u3002\u3042\u308b\u3044\u306f\u3001\u8ee2\u9001\u4e2d\u306b\u5909\u66f4\u3055\u308c\u306a\u3044\u3001\u5143\u306e\u9001\u4fe1\u8005\u304b\u3089\u306e\u5b89\u5b9a\u3057\u305fDKIM\u7f72\u540d\u304c\u5f79\u7acb\u3061\u307e\u3059\u3002ARC\u30d8\u30c3\u30c0\u30fc\u306f\u3001\u30c1\u30a7\u30fc\u30f3\u306b\u6cbf\u3063\u305f\u691c\u8a3c\u30b9\u30c6\u30c3\u30d7\u3092\u6587\u66f8\u5316\u3057\u3001\u6b63\u5f53\u306a\u30d5\u30a9\u30ef\u30fc\u30c0\u30fc\u3092\u4e0d\u5fc5\u8981\u306b\u6e1b\u901f\u3055\u305b\u306a\u3044\u305f\u3081\u306e\u8ffd\u52a0\u30b7\u30b0\u30ca\u30eb\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u308b\u3002\u65e2\u77e5\u306e\u8ee2\u9001\u30b5\u30fc\u30d3\u30b9\u306b\u3064\u3044\u3066\u306f\u3001DKIM\/ARC\u304c\u59a5\u5f53\u3067\u3042\u308b\u5834\u5408\u306b\u306e\u307f\u6709\u52b9\u306b\u306a\u308b\u3001\u53b3\u5bc6\u306b\u30c1\u30a7\u30c3\u30af\u3055\u308c\u305f\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u3092\u5225\u306b\u4fdd\u7ba1\u3057\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u30af\u30e9\u30a6\u30c9\u30bb\u30f3\u30c0\u30fc\u3068\u30c0\u30a4\u30ca\u30df\u30c3\u30afIP\u30d7\u30fc\u30eb\u3092\u6b63\u3057\u304f\u6271\u3046<\/h2>\n<p>\u5927\u898f\u6a21\u306a\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\uff08\u30aa\u30d5\u30a3\u30b9\u3084\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30b5\u30fc\u30d3\u30b9\u306a\u3069\uff09\u3067\u306f\u3001\u5e83\u7bc4\u3067\u5909\u5316\u3059\u308bIP\u30d7\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u79c1\u306f\u3001\u3053\u3053\u3067\u306f\u500b\u3005\u306eIP\u306b\u3042\u307e\u308a\u4f9d\u5b58\u305b\u305a\u3001\u6709\u52b9\u306aSPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3001\u5b89\u5b9a\u3057\u305fDKIM\u30c9\u30e1\u30a4\u30f3\u3001\u4e00\u8cab\u3057\u305fHELO\/EHLO\u306e\u52d5\u4f5c\u3001\u30af\u30ea\u30fc\u30f3\u306arDNS\u3068\u3044\u3063\u305f\u6a5f\u80fd\u306e\u30d0\u30f3\u30c9\u30eb\u306b\u4f9d\u5b58\u3057\u3066\u3044\u307e\u3059\u3002Greylisting\u306f\u4f9d\u7136\u3068\u3057\u3066\u6709\u52b9\u3067\u3059\u304c\u3001\u4e00\u9023\u306e\u30b7\u30b0\u30ca\u30eb\u304c\u4e00\u8cab\u3057\u3066\u3044\u308b\u9650\u308a\u3001\u3088\u308a\u65e9\u3044\u6709\u52b9\u5316\u3092\u53d7\u3051\u5165\u308c\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u30b5\u30fc\u30d3\u30b9\u304b\u3089\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u306b\u3064\u3044\u3066\u306f\u3001\u5358\u7d14\u306afrom-spoofs\u306b\u3088\u308b\u60aa\u7528\u3092\u9632\u3050\u305f\u3081\u306b\u3001\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u30eb\u30fc\u30eb\u3092\u30d8\u30c3\u30c0\u30fc\u7279\u6027\uff08\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u3001\u30ea\u30b9\u30c8ID\u3001\u7279\u5b9a\u306eDKIM-d=\u306a\u3069\uff09\u3068\u30ea\u30f3\u30af\u3055\u305b\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u3068\u9ad8\u53ef\u7528\u6027\uff1a\u30a4\u30f3\u30c6\u30ea\u30b8\u30a7\u30f3\u30c8\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5171\u6709\u3059\u308b<\/h2>\n<p>\u8907\u6570\u306eMX\u30b5\u30fc\u30d0\u30fc\u3092\u904b\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001MX1\u3067\u306e\u6700\u521d\u306e\u30b3\u30f3\u30bf\u30af\u30c8\u304cMX2\u3067\u306e\u4e0d\u8981\u306a\u5f85\u3061\u6642\u9593\u306b\u3064\u306a\u304c\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u30b0\u30ec\u30a4\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4e00\u5143\u7684\u306b\uff08\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3084\u30a4\u30f3\u30e1\u30e2\u30ea\u30b9\u30c8\u30a2\u306a\u3069\u3067\uff09\u5171\u6709\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u8cab\u3057\u305f\u30cf\u30c3\u30b7\u30e5\u6226\u7565\u3067\u30db\u30c3\u30c8\u30b9\u30dd\u30c3\u30c8\u3092\u9632\u304e\u3001\u30c8\u30ea\u30d7\u30ec\u30c3\u30c8\u3054\u3068\u306eTTL\u3092\u77ed\u3044\u304c\u5f3e\u529b\u6027\u306e\u3042\u308b\u3082\u306e\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u4fdd\u8b77\u3068\u901f\u5ea6\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u4fdd\u3063\u3066\u3044\u308b\u3002\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6642\u3084\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u6642\u306b\u306f\u3001\u518d\u8d77\u52d5\u5f8c\u306b\u521d\u671f\u9045\u5ef6\u304c\u6025\u5897\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u4fdd\u6301\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u30af\u30e9\u30b9\u30bf\u5185\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u3001\u30ce\u30fc\u30c9\u3054\u3068\u306b\u7d71\u8a08\u60c5\u5831\u3092\u5206\u3051\u3066\u4e00\u5143\u7684\u306b\u96c6\u8a08\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>Postfix\u3068Exim\u306e\u9ad8\u5ea6\u306a\u5b9f\u8df5<\/h2>\n<p>Postfix\u3067\u306f\u3001\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u306b\u8ca0\u62c5\u3092\u304b\u3051\u305a\u306b\u30c0\u30fc\u30c6\u30a3\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u516c\u958b\u3059\u308b\u305f\u3081\u306b\u3001\u8efd\u3044\u30bf\u30fc\u30d4\u30c3\u30c6\u30a3\u30f3\u30b0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