{"id":18841,"date":"2026-04-08T15:07:16","date_gmt":"2026-04-08T13:07:16","guid":{"rendered":"https:\/\/webhosting.de\/mail-queue-lifetime-smtp-retry-hosting-strategie-queueboost\/"},"modified":"2026-04-08T15:07:16","modified_gmt":"2026-04-08T13:07:16","slug":"%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%ae%e5%af%bf%e5%91%bd-smtp-%e5%86%8d%e8%a9%a6%e8%a1%8c-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e6%88%a6%e7%95%a5-queueboost","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/mail-queue-lifetime-smtp-retry-hosting-strategie-queueboost\/","title":{"rendered":"\u30e1\u30fc\u30eb\u30ad\u30e5\u30fc\u5bff\u547d\uff1aSMTP\u518d\u8a66\u884c\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3068\u914d\u4fe1\u6226\u7565\u306e\u6700\u9069\u5316"},"content":{"rendered":"<p><strong>\u30e1\u30fc\u30eb\u30ad\u30e5\u30fc\u5bff\u547d<\/strong> \u306f\u3001MTA\u304c\u96fb\u5b50\u30e1\u30fc\u30eb\u3092\u30ad\u30e5\u30fc\u306b\u4fdd\u6301\u3059\u308b\u671f\u9593\u3068\u3001\u65b0\u3057\u3044\u914d\u4fe1\u8a66\u884c\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3059\u308b\u7a4d\u6975\u6027\u3092\u5236\u5fa1\u3057\u307e\u3059\u3002SMTP\u306e\u518d\u8a66\u884c\u9593\u9694\u3001\u30d0\u30c3\u30af\u30aa\u30d5\u30ed\u30b8\u30c3\u30af\u3001\u304a\u3088\u3073\u914d\u4fe1\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u3069\u306e\u3088\u3046\u306b\u8abf\u6574\u3057\u3001\u4e00\u6642\u7684\u306a\u4e2d\u65ad\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u6642\u9593\u901a\u308a\u3001\u30ea\u30bd\u30fc\u30b9\u52b9\u7387\u306e\u826f\u3044\u65b9\u6cd5\u3067\u5230\u7740\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u304b\u3092\u304a\u898b\u305b\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>\u751f\u6daf<\/strong>\u5f85\u3061\u884c\u5217\u306e\u6ede\u7559\u6642\u9593\u3092\u76ee\u6a19\u901a\u308a\u306b\u77ed\u7e2e\u307e\u305f\u306f\u5ef6\u9577\u3059\u308b\u3002<\/li>\n  <li><strong>\u30ea\u30c8\u30e9\u30a4<\/strong>\u30d0\u30c3\u30af\u30aa\u30d5\u30674xx\u30a8\u30e9\u30fc\u3092\u30af\u30ea\u30fc\u30f3\u306b\u7de9\u548c\u3059\u308b<\/li>\n  <li><strong>\u30bf\u30a4\u30df\u30f3\u30b0<\/strong>\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u3088\u308a\u3082\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u512a\u5148\u3059\u308b<\/li>\n  <li><strong>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/strong>\u30ad\u30e5\u30fc\u306e\u6df1\u3055\u3001\u30ea\u30c8\u30e9\u30a4\u7387\u3001\u30ea\u30fc\u30c9\u30d0\u30a6\u30f3\u30b9<\/li>\n  <li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/strong>SPF\u3001DKIM\u3001DMARC\u306e\u4e00\u8cab\u3057\u305f\u4f7f\u7528<\/li>\n<\/ul>\n\n<h2>\u30e1\u30fc\u30eb\u30ad\u30e5\u30fc\u306e\u4ed5\u7d44\u307f<\/h2>\n\n<p>\u96fb\u5b50\u30e1\u30fc\u30eb\u306f <strong>\u5f85\u3061\u884c\u5217<\/strong>, \u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u304c\u4e00\u6642\u7684\u306b\u5229\u7528\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u554f\u984c\u304c\u3042\u308b\u5834\u5408\u3001\u8ca0\u8377\u304c\u30d4\u30fc\u30af\u306b\u9054\u3057\u3066\u3044\u308b\u5834\u5408\u3002\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc(4xx)\u3068\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc(5xx)\u3092\u660e\u78ba\u306b\u533a\u5225\u3057\u3066\u3044\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001Postfix\u306f\u672a\u914d\u4fe1\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u9001\u4fe1\u8005\u306b\u9001\u3089\u308c\u308b\u524d\u306b\u3001\u30ad\u30e5\u30fc\u306b\u6700\u59275\u65e5\u9593\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002\u3053\u306e\u65e5\u6570\u306f\u3001\u30e1\u30e2\u30ea\u3001I\/O\u3001\u914d\u4fe1\u901f\u5ea6\u306b\u76f4\u63a5\u5f71\u97ff\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u91cd\u8981\u306a\u30e1\u30fc\u30eb\u304c\u653e\u7f6e\u3055\u308c\u3001\u7121\u95a2\u4fc2\u306a\u53e4\u3044\u30e1\u30fc\u30eb\u304c\u3059\u3050\u306b\u30b7\u30b9\u30c6\u30e0\u304b\u3089\u843d\u3061\u308b\u3053\u3068\u306e\u306a\u3044\u3088\u3046\u3001\u30ad\u30e5\u30fc\u3092\u8a08\u753b\u3057\u3066\u3044\u307e\u3059\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\/04\/smtp-serverraum-8241.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30e1\u30fc\u30eb\u30ad\u30e5\u30fc\u306e\u6709\u52b9\u671f\u9650\u3092\u7279\u306b\u8a2d\u5b9a\u3059\u308b<\/h2>\n\n<p>\u79c1\u306f\u305d\u308c\u3092\u8abf\u6574\u3057\u307e\u3059\u3002 <strong>\u6700\u5927<\/strong> \u6ede\u7559\u6642\u9593\u3092\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30fb\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070Postfix\u3067\u306f\u3001\u91cf\u304c\u591a\u304f\u3001\u53e4\u304f\u306a\u3063\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3082\u306f\u3084\u610f\u5473\u3092\u306a\u3055\u306a\u3044\u5834\u5408\u3001postconf -e \u201amaximal_queue_lifetime = 1d'\u3092\u4f7f\u7528\u3057\u3066\u3001\u6ede\u7559\u6642\u9593\u30921\u65e5\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u5f8c\u7d9a\u306epostqueue -f\u306f\u3001\u65b0\u3057\u3044\u8a66\u307f\u3092\u30c8\u30ea\u30ac\u30fc\u3057\u3001\u73fe\u5728\u306e\u30ad\u30e5\u30fc\u3092\u65b0\u3057\u3044\u30ed\u30b8\u30c3\u30af\u306b\u9069\u5408\u3055\u305b\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u3053\u308c\u306f\u4e8b\u5b9f\u4e0a\u5373\u6642\u62d2\u5426\u3092\u610f\u5473\u3057\u3001\u53b3\u5bc6\u306b\u7ba1\u7406\u3055\u308c\u305f\u7279\u5225\u306a\u74b0\u5883\u3067\u306e\u307f\u610f\u5473\u3092\u6301\u3064\u304b\u3089\u3060\u3002\u3088\u308a\u6df1\u304f\u6398\u308a\u4e0b\u3052\u305f\u3044\u306e\u3067\u3042\u308c\u3070\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%ad%e3%83%a5%e3%83%bc%e7%ae%a1%e7%90%86-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-postfix-optimus\/\">\u30ad\u30e5\u30fc\u7ba1\u7406\u306b\u95a2\u3059\u308b\u6307\u793a<\/a>, \u3053\u308c\u306f\u6700\u3082\u91cd\u8981\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3042\u308b\u3002.<\/p>\n\n<h2>SMTP\u30ea\u30c8\u30e9\u30a4\u306e\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\uff1a\u30d0\u30c3\u30af\u30aa\u30d5\u3092\u8ce2\u304f\u5229\u7528\u3059\u308b<\/h2>\n\n<p>\u79c1\u306f\u4e00\u6642\u7684\u306a4xx\u5fdc\u7b54\u3092\u6b21\u306e\u3088\u3046\u306b\u89e3\u91c8\u3057\u3066\u3044\u308b\u3002 <strong>\u4fe1\u53f7<\/strong>, \u307e\u305f\u5f8c\u65e5\u3001\u9593\u9694\u3092\u7a7a\u3051\u3066\u3084\u3063\u3066\u307f\u308b\u3002\u79c1\u306f\u3088\u304f15\u5206\u304b\u3089\u59cb\u3081\u300130\u5206\u30011\u6642\u9593\u3001\u305d\u3057\u30666\u6642\u9593\u3068\u3044\u3046\u5177\u5408\u3060\u3002\u3053\u306e\u6307\u6570\u95a2\u6570\u7684\u306a\u30ed\u30b8\u30c3\u30af\u306f\u3001\u30a4\u30f3\u30d5\u30e9\u3078\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\u3057\u3001\u3059\u3067\u306b\u9650\u754c\u307e\u3067\u7a3c\u50cd\u3057\u3066\u3044\u308b\u5916\u90e8\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u56de\u907f\u3059\u308b\u3002\u3053\u308c\u3068\u306f\u5bfe\u7167\u7684\u306b\u3001\u79c1\u306f5xx\u5fdc\u7b54\u3092\u6c38\u4e45\u7684\u306a\u30a8\u30e9\u30fc\u3068\u3057\u3066\u6271\u3044\u3001\u9045\u5ef6\u306a\u304f\u518d\u8a66\u884c\u3092\u7d42\u4e86\u3055\u305b\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ad\u30e5\u30fc\u306f\u5c0f\u3055\u304f\u306a\u308a\u3001CPU\u306f\u9759\u304b\u306b\u306a\u308a\u3001\u30d4\u30fc\u30af\u6642\u3092\u81ea\u52d5\u7684\u306b\u907f\u3051\u308b\u305f\u3081\u3001\u914d\u4fe1\u306e\u78ba\u7387\u306f\u9ad8\u307e\u308a\u307e\u3059\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\/smtp_optimierung_1456.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u30fb\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\uff1a\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\u3068\u8abf\u6574<\/h2>\n\n<p>\u306e\u5834\u5408 <strong>\u9759\u304b<\/strong> \u30ad\u30e5\u30fc\u3067\u306f\u3001Postfix\u306e\u6700\u3082\u91cd\u8981\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5b9f\u969b\u306e\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u5408\u308f\u305b\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u5024\u306f\u3001\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u74b0\u5883\u306b\u304a\u3051\u308b\u826f\u3044\u51fa\u767a\u70b9\u3068\u306a\u308a\u3001\u91cf\u306b\u5fdc\u3058\u3066\u5fae\u8abf\u6574\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u79c1\u306f\u3001\u914d\u4fe1\u901f\u5ea6\u3068\u30b7\u30b9\u30c6\u30e0\u8ca0\u8377\u306e\u30d0\u30e9\u30f3\u30b9\u306b\u6ce8\u610f\u3057\u3066\u3044\u307e\u3059\u3002\u30ad\u30e5\u30fc\u3092\u5b9f\u884c\u3059\u308b\u983b\u5ea6\u3092\u5c11\u306a\u304f\u3059\u308c\u3070CPU\u3092\u7bc0\u7d04\u3067\u304d\u3001\u30d0\u30c3\u30af\u30aa\u30d5\u6642\u9593\u3092\u9577\u304f\u3059\u308c\u3070\u52a0\u71b1\u3057\u305f\u518d\u8a66\u884c\u3092\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u3092\u77ed\u304f\u3059\u308c\u3070\u3001\u30e1\u30e2\u30ea\u6d88\u8cbb\u91cf\u304c\u6e1b\u308a\u3001\u9001\u4fe1\u8005\u3078\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u3082\u901f\u304f\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n      <th>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/th>\n      <th>\u63a8\u5968\u3055\u308c\u308b\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/th>\n      <th>\u52b9\u679c<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>queue_run_delay<\/td>\n      <td>300s<\/td>\n      <td>900s<\/td>\n      <td><strong>CPU\u8ca0\u8377<\/strong> \u5927\u97f3\u91cf\u3067\u6e1b\u3089\u3059<\/td>\n    <\/tr>\n    <tr>\n      <td>\u6700\u5c0f\u30d0\u30c3\u30af\u30aa\u30d5\u6642\u9593<\/td>\n      <td>300s<\/td>\n      <td>900s<\/td>\n      <td><strong>\u904e\u5270<\/strong> \u30ea\u30c8\u30e9\u30a4\u3092\u6e1b\u3089\u3059<\/td>\n    <\/tr>\n    <tr>\n      <td>\u6700\u5927\u30ad\u30e5\u30fc\u5bff\u547d<\/td>\n      <td>5d<\/td>\n      <td>1-3d<\/td>\n      <td><strong>\u30e1\u30e2\u30ea<\/strong> \u7d4c\u8cbb\u7bc0\u6e1b\u3001\u6e0b\u6ede\u7de9\u548c<\/td>\n    <\/tr>\n    <tr>\n      <td>bounce_queue_lifetime<\/td>\n      <td>5d<\/td>\n      <td>1d<\/td>\n      <td><strong>\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af<\/strong> \u3088\u308a\u901f\u304f\u9001\u308b<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u30bf\u30a4\u30df\u30f3\u30b0\uff1a\u512a\u5148\u9806\u4f4d\u3068\u914d\u4fe1\u30a6\u30a3\u30f3\u30c9\u30a6<\/h2>\n\n<p>\u6ce8\u6587\u306e\u78ba\u8a8d\u306a\u3069\u3001\u53d6\u5f15\u306b\u95a2\u3059\u308b\u30e1\u30fc\u30eb\u306f\u3044\u3064\u3082 <strong>\u30c8\u30c3\u30d7<\/strong> \u4e00\u65b9\u3001\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306e\u6d3e\u9063\u306f\u9759\u304b\u306a\u6642\u9593\u5e2f\u306b\u884c\u3046\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3092\u9ad8\u901f\u306b\u4fdd\u3061\u3001\u30d4\u30fc\u30af\u6642\u4ee5\u5916\u3067\u3082\u5bfe\u8c61\u30b5\u30fc\u30d0\u30fc\u306b\u8ca0\u8377\u3092\u304b\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u5927\u898f\u6a21\u306a\u914d\u4fe1\u30ea\u30b9\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u901a\u5e38\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306b\u7a7a\u304d\u304c\u51fa\u308b\u3088\u3046\u306b\u3001\u5225\u306e\u30ad\u30e5\u30fc\u3084\u5c02\u7528\u306e\u30ea\u30ec\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u5236\u9650\u3092\u5b89\u5168\u306b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u5b9f\u7528\u7684\u306a\u8a73\u7d30\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\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-%e3%82%b9%e3%83%ad%e3%83%83%e3%83%88%e3%83%aa%e3%83%b3%e3%82%b0-smtp%e5%88%b6%e9%99%90-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3\/\">SMTP\u5236\u9650\u3068\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0<\/a> \u306b\u3042\u308b\u3002\u540c\u6642\u63a5\u7d9a\u6570\u306e\u5236\u9650\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308c\u3070\u3001\u540c\u6642\u63a5\u7d9a\u6570\u304c\u591a\u3059\u304e\u3066\u62d2\u5426\u3055\u308c\u308b\u3053\u3068\u306f\u306a\u3044\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\/smtp-hosting-strategy-5324.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u74b0\u5883\u306e\u30c7\u30ea\u30d0\u30ea\u30fc\u6226\u7565<\/h2>\n\n<p>\u79c1\u306f\u5225 <strong>\u8f38\u9001<\/strong> \u8ad6\u7406\uff1a\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3001\u30b7\u30b9\u30c6\u30e0\u30e1\u30c3\u30bb\u30fc\u30b8\u3001\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306f\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u30eb\u30fc\u30c8\u307e\u305f\u306f\u30d7\u30fc\u30eb\u3092\u4ecb\u3057\u3066\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u5206\u5272\u306b\u3088\u308a\u3001\u3076\u3089\u4e0b\u304c\u3063\u305f\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u304c\u91cd\u8981\u306a\u30e1\u30fc\u30eb\u3092\u9045\u304f\u3059\u308b\u306e\u3092\u9632\u304e\u307e\u3059\u3002\u4e0d\u5fc5\u8981\u306b\u30ea\u30c8\u30e9\u30a4\u3092\u5ef6\u9577\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u306a\u308b\u30d1\u30fc\u30c8\u30ca\u30fc\u30c9\u30e1\u30a4\u30f3\u306eTLS\u30a8\u30f3\u30d5\u30a9\u30fc\u30b9\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u3068\u30c8\u30ec\u30fc\u30b5\u30d3\u30ea\u30c6\u30a3\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001MTA-STS\u3068TLS-RPT\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5168\u4f53\u7684\u306a\u6226\u7565\u3092\u7406\u89e3\u3057\u3084\u3059\u304f\u3001\u4fdd\u5b88\u3057\u3084\u3059\u304f\u3001\u5f3e\u529b\u7684\u306b\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>\u30ad\u30e5\u30fc\u306e\u76e3\u8996\u3068\u8a3a\u65ad<\/h2>\n\n<p>\u3092\u8aad\u3093\u3060\u3002 <strong>\u30ad\u30e5\u30fc<\/strong> mailq\u307e\u305f\u306fpostqueue -p\u3092\u5b9a\u671f\u7684\u306b\u5b9f\u884c\u3057\u3001\u6642\u9593\u5e2f\u306b\u3088\u3063\u3066\u6df1\u3055\u3092\u8a55\u4fa1\u3059\u308b\u3002\u9855\u8457\u306a\u30b9\u30d1\u30a4\u30af\u306f\u3001\u53d7\u4fe1\u8005\u306e\u8aa4\u52d5\u4f5c\u3001DNS\u306e\u554f\u984c\u3001\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u306e\u4e0d\u5177\u5408\u306e\u5146\u5019\u3068\u89e3\u91c8\u3057\u3066\u3044\u308b\u3002qshape\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u5e74\u9f62\u5206\u5e03\u3092\u8a8d\u8b58\u3057\u3001\u518d\u8a66\u884c\u304c\u84c4\u7a4d\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30ed\u30b0\u304b\u3089\u30b3\u30fc\u30c9\u3068\u62d2\u5426\u3055\u308c\u305f\u6b63\u78ba\u306a\u6642\u9593\u304c\u308f\u304b\u308b\u306e\u3067\u3001\u3055\u3089\u306a\u308b\u6700\u9069\u5316\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u518d\u8a66\u884c\u7387\u3001\u76f4\u5e30\u7387\u3001\u914d\u4fe1\u307e\u3067\u306e\u5e73\u5747\u5f85\u3061\u6642\u9593\u306a\u3069\u306e\u6307\u6a19\u3082\u8ffd\u8de1\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/smtp_strategy_night_9876.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30a8\u30e9\u30fc\u30fb\u30af\u30e9\u30b9\u3092\u6b63\u3057\u304f\u89e3\u91c8\u3059\u308b<\/h2>\n\n<p>4xx\u30b3\u30fc\u30c9\u306f <strong>\u5ef6\u671f<\/strong>, \u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u306a\u3044\u3002\u30ad\u30e5\u30fc\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6b8b\u3057\u3001\u9593\u9694\u3092\u9069\u5ea6\u306b\u5ef6\u9577\u3059\u308b\u30025xx\u30b3\u30fc\u30c9\u3067\u305d\u308c\u4ee5\u4e0a\u306e\u8a66\u884c\u3092\u7d42\u4e86\u3055\u305b\u3001\u30ea\u30bd\u30fc\u30b9\u3092\u7bc0\u7d04\u3057\u3001\u30d0\u30a6\u30f3\u30b9\u3092\u767a\u751f\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30d0\u30a6\u30f3\u30b9\u901a\u77e5\u306f\u3001\u9001\u4fe1\u8005\u304c\u539f\u56e0\u3092\u3059\u3050\u306b\u8a8d\u8b58\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u660e\u78ba\u3067\u77ed\u3044\u3082\u306e\u306b\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u900f\u660e\u6027\u304c\u5897\u3057\u3001\u4e0d\u8981\u306a\u30b5\u30dd\u30fc\u30c8\u30c1\u30b1\u30c3\u30c8\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>\u914d\u4fe1\u901f\u5ea6\u3092\u843d\u3068\u3055\u305a\u306b\u30b9\u30d1\u30e0\u5bfe\u7b56<\/h2>\n\n<p>\u30b0\u30ec\u30a4\u30ea\u30b9\u30c6\u30a3\u30f3\u30b0\u306f <strong>\u8ca0\u8377<\/strong> \u3057\u304b\u3057\u3001\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u304c\u4e0d\u5fc5\u8981\u306b\u5f85\u305f\u3055\u308c\u308b\u3053\u3068\u304c\u306a\u3044\u3088\u3046\u306b\u3001\u79c1\u306f\u6ce8\u610f\u6df1\u304f\u305d\u308c\u3092\u884c\u3044\u307e\u3059\u3002\u30d1\u30fc\u30c8\u30ca\u30fc\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u591a\u3044\u74b0\u5883\u3067\u306f\u3001\u4fe1\u983c\u3067\u304d\u308bIP\u3084ASN\u306e\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u540c\u6642\u306b\u3001SPF\u3001DKIM\u3001DMARC\u3092\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\u3001\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u914d\u4fe1\u30ec\u30fc\u30c8\u3092\u4fdd\u8b77\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u30dc\u30c3\u30c8\u304c\u30ad\u30e5\u30fc\u306b\u8a70\u307e\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u63a5\u7d9a\u3068\u30ec\u30fc\u30c8\u3092\u5236\u9650\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u624b\u9806\u3067\u5b9f\u7528\u7684\u306a\u5024\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002 <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\/\">\u4fdd\u8b77\u3068\u3057\u3066\u306e\u30b0\u30ea\u30fc\u30f3\u30ea\u30b9\u30c8<\/a> \u751f\u7523\u7684\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u5177\u4f53\u7684\u306a\u30d2\u30f3\u30c8\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\/entwickler_arbeitsplatz_6789.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5178\u578b\u7684\u306a\u30b7\u30ca\u30ea\u30aa\u306e\u5177\u4f53\u7684\u306a\u8a2d\u5b9a<\/h2>\n\n<p>\u306e\u305f\u3081\u306b <strong>\u30b7\u30e7\u30c3\u30d7<\/strong> \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u591a\u3044\u5834\u5408\u3001\u9001\u4fe1\u8005\u304c\u8fc5\u901f\u306b\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u53d7\u3051\u53d6\u308c\u308b\u3088\u3046\u306b\u3001maximal_queue_lifetime\u30921d\u306b\u3001bounce_queue_lifetime\u30921d\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u30d0\u30c3\u30af\u30aa\u30d5\u30fb\u30ab\u30fc\u30d6\u306f15\u5206\u3067\u958b\u59cb\u3057\u3001\u6570\u56de\u8a66\u884c\u3057\u305f\u5f8c\u306b1\u6642\u9593\u3001\u305d\u306e\u5f8c6\u6642\u9593\u306b\u5897\u3084\u3057\u3066\u3044\u307e\u3059\u3002\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30fb\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u306f\u5c02\u7528\u306e\u30ea\u30ec\u30fc\u3092\u4e0e\u3048\u3001\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u3067\u306f\u3057\u3070\u3057\u3070\u5927\u898f\u6a21\u3067\u4f4e\u901f\u306a\u30c9\u30e1\u30a4\u30f3\u306b\u906d\u9047\u3059\u308b\u305f\u3081\u30012-3d\u3068\u9577\u3081\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3002\u900f\u660e\u6027\u3068\u5b8c\u5168\u6027\u304c\u30b9\u30d4\u30fc\u30c9\u3088\u308a\u3082\u91cd\u8981\u306a\u5834\u5408\u306f\u3001\u5185\u90e8\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u7528\u306b3-5d\u3092\u6b8b\u3059\u3002\u3053\u308c\u3089\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306e\u304a\u304b\u3052\u3067\u3001\u79c1\u306f\u3059\u3067\u306b\u4f55\u5ea6\u304b\u30ad\u30e5\u30fc\u306e\u6df1\u3055\u3092\u6e1b\u3089\u3057\u3001\u5e38\u306b\u30d3\u30b8\u30cd\u30b9\u30e1\u30fc\u30eb\u3092\u6d41\u3057\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/04\/serverraum-optimierung-3147.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>Plesk\u3001Postfix\u3001\u30af\u30a4\u30c3\u30af\u30c1\u30a7\u30c3\u30af<\/h2>\n\n<p>\u6642\u70b9\u3067\u306f <strong>\u30d7\u30ec\u30b9\u30af<\/strong>-postconf\uff5cgrepmaximal_queue_lifetime\u3067\u73fe\u5728\u306e\u5024\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u4e26\u884c\u3057\u3066minimal_backoff_time\u3068queue_run_delay\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u5909\u66f4\u3092\u3059\u3050\u306b\u6709\u52b9\u306b\u3057\u305f\u3044\u5834\u5408\u306f\u3001postqueue -f\u3067\u65b0\u3057\u3044\u5b9f\u884c\u3092\u958b\u59cb\u3057\u307e\u3059\u3002\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u304c\u9032\u884c\u4e2d\u3067\u3001\u305d\u306e\u52b9\u679c\u3092\u3059\u3050\u306b\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u3001\u3053\u308c\u306f\u6642\u9593\u306e\u7bc0\u7d04\u306b\u306a\u308b\u3002\u307e\u305f\u3001MX\u3001SPF\u3001PTR\u306a\u3069\u306eDNS\u8a2d\u5b9a\u306b\u3082\u76ee\u3092\u5149\u3089\u305b\u3066\u3044\u307e\u3059\u3002\u8a2d\u5b9a\u30df\u30b9\u306f\u3059\u3050\u306b\u914d\u4fe1\u7387\u306b\u5f71\u97ff\u3059\u308b\u304b\u3089\u3067\u3059\u3002\u5927\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u524d\u306b\u3001\u7d20\u65e9\u304f\u5065\u5eb7\u72b6\u614b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u3067\u3001\u307b\u3068\u3093\u3069\u306e\u9a5a\u304d\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>\u6bce\u65e5\u898b\u3066\u3044\u308b\u4e3b\u306a\u6570\u5b57<\/h2>\n\n<p>\u6e2c\u308b <strong>\u30ad\u30e5\u30fc\u306e\u6df1\u3055<\/strong>, \u914d\u4fe1\u307e\u3067\u306e\u5f85\u3061\u6642\u9593\u306e\u4e2d\u592e\u5024\u3001\u30c9\u30e1\u30a4\u30f3\u5225\u306e\u4e00\u6642\u7684\u30a8\u30e9\u30fc\u306e\u5272\u5408\u3002\u7279\u5b9a\u306e\u30bf\u30fc\u30b2\u30c3\u30c8TLD\u306e4xx\u7387\u306e\u5897\u52a0\u306f\u3001\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\u3084\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30d0\u30a6\u30f3\u30b9\u7387\u304c\u6025\u4e0a\u6607\u3057\u305f\u5834\u5408\u306f\u30015xx\u306e\u7406\u7531\u3092\u5206\u6790\u3057\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3001\u9001\u4fe1\u8005\u3001\u8a8d\u8a3c\u3092\u8abf\u6574\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u63a5\u7d9a\u30a8\u30e9\u30fc\u3084TLS\u30cd\u30b4\u30b7\u30a8\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u3082\u8a18\u9332\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5024\u3092\u4f7f\u3063\u3066\u3001\u30a4\u30f3\u30d5\u30e9\u306b\u8ca0\u8377\u3092\u304b\u3051\u305a\u306b\u30d0\u30c3\u30af\u30aa\u30d5\u30fb\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u5fae\u8abf\u6574\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u9593\u306e\u885d\u7a81\u56de\u907f<\/h2>\n\n<p>\u3060\u304b\u3089 <strong>\u30ad\u30e3\u30f3\u30da\u30fc\u30f3<\/strong> \u304a\u4e92\u3044\u306e\u901f\u5ea6\u304c\u843d\u3061\u306a\u3044\u3088\u3046\u306b\u3001\u30d0\u30c3\u30d5\u30a1\u3092\u4f7f\u3063\u3066\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u8a08\u753b\u3057\u307e\u3059\u3002\u5927\u91cf\u306e\u30e1\u30fc\u30eb\u3092\u6570\u6642\u9593\u304b\u3051\u3066\u914d\u4fe1\u3057\u3001\u500b\u3005\u306e\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u53b3\u3057\u3044\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\u3092\u884c\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30db\u30b9\u30c8\u56fa\u6709\u306e\u5236\u9650\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30d1\u30b9\u30ef\u30fc\u30c9\u30ea\u30bb\u30c3\u30c8\u306e\u3088\u3046\u306a\u91cd\u8981\u306a\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306e\u8ca0\u8377\u304c\u304b\u304b\u3089\u306a\u3044\u5225\u306e\u30d7\u30fc\u30eb\u306b\u4fdd\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u5916\u90e8MTA\u304c\u8457\u3057\u304f\u983b\u7e41\u306b\u5931\u6557\u3059\u308b\u5834\u5408\u306f\u3001\u8a66\u884c\u3092\u591c\u9593\u306b\u5ef6\u671f\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u5e73\u5747\u914d\u4fe1\u6642\u9593\u3092\u4f4e\u304f\u4fdd\u3061\u3001\u30ad\u30e5\u30fc\u3092\u5b89\u5b9a\u3055\u305b\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>\u65e5\u5e38\u751f\u6d3b\u306b\u304a\u3051\u308b\u3055\u3089\u306a\u308b\u30dd\u30b9\u30c8\u30d5\u30a3\u30c3\u30af\u30b9\u30fb\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc<\/h2>\n\n<p>\u57fa\u672c\u7684\u306a\u5024\u306b\u52a0\u3048\u3066\u3001\u79c1\u306f\u3044\u304f\u3064\u304b\u306e\u8ffd\u52a0\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u3055\u3089\u306b\u5927\u304d\u306a\u5024\u3092\u4e0e\u3048\u3066\u3044\u308b\u3002 <strong>\u5236\u5fa1\u6027<\/strong> \u3068\u51b7\u9759\u306a\u30ad\u30e5\u30fc\uff1a<\/p>\n\n<ul>\n  <li><strong>\u6700\u5927\u30d0\u30c3\u30af\u30aa\u30d5\u6642\u9593<\/strong>\u3057\u3064\u3053\u30444xx\u30a8\u30e9\u30fc\u306e\u5834\u5408\u3001\u30ea\u30c8\u30e9\u30a4\u306e\u56de\u6570\u304c\u5897\u3048\u3059\u304e\u306a\u3044\u3088\u3046\u306b\u3001\u79c1\u306f\u3053\u3053\u30676\uff5e12h\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u3002.<\/li>\n  <li><strong>smtp_connect_timeout<\/strong>, <strong>smtp_helo_timeout<\/strong>, <strong>smtp_data_xfer_timeout<\/strong>\u73fe\u5b9f\u7684\u306a\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\uff0830\uff5e60\u79d2\u306e\u63a5\u7d9a\u300160\u79d2\u306eHELO\u3001\u6570\u5206\u306eDATA\uff09\u306f\u3001\u30b9\u30ed\u30c3\u30c8\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u30cf\u30f3\u30b0\u30a2\u30c3\u30d7\u3092\u9632\u3050\u3002.<\/li>\n  <li><strong>smtp_connection_cache_time_limit<\/strong>TCP\/TLS\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u518d\u5229\u7528\u3057\u3001\u58ca\u308c\u305f\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u306b\u9577\u304f\u7559\u307e\u308b\u3053\u3068\u306a\u304f\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u3092\u7bc0\u7d04\u3067\u304d\u308b\u3002.<\/li>\n  <li><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u30fb\u30c7\u30b9\u30c6\u30a3\u30cd\u30fc\u30b7\u30e7\u30f3\u901a\u8ca8\u30ea\u30df\u30c3\u30c8<\/strong> \u305d\u3057\u3066 <strong>smtp_destination_concurrency_limit\u3002<\/strong>\u4e26\u884c\u914d\u4fe1\u304c\u591a\u3059\u304e\u3066\u30ea\u30b8\u30a7\u30af\u30c8\u3055\u308c\u308b\u306e\u3092\u907f\u3051\u308b\u305f\u3081\u3001\u5bfe\u8c61\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306b\u610f\u56f3\u7684\u306b\u30b9\u30ed\u30c3\u30c8\u30eb\uff08\u4f8b\u3048\u30705\uff5e10\uff09\u3092\u304b\u3051\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u5b9b\u5148\u30ec\u30fc\u30c8\u9045\u5ef6<\/strong> \u305d\u308c\u305e\u308c <strong>smtp_destination_rate_delay\u3002<\/strong>\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u3078\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u9593\u306e\u77ed\u3044\u9045\u5ef6\uff08\u4f8b\u3048\u30701-2\u79d2\uff09\u306f\u3001\u30d6\u30ed\u30c3\u30af\u30ea\u30b9\u30c8\u306e\u30ea\u30b9\u30af\u30684xx\u306e\u8ca0\u8377\u3092\u6e1b\u3089\u3059\u3002.<\/li>\n  <li><strong>qmgr_message_active_limit<\/strong>\u79c1\u306f\u3001\u30a2\u30af\u30c6\u30a3\u30d6\u30fb\u30bb\u30c3\u30c8\u304c\u7ba1\u7406\u3057\u3084\u3059\u304f\u3001I\/O\u304c\u30d5\u30e9\u30d5\u30e9\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u63a7\u3048\u3081\uff08\u4f8b\u3048\u30702000-5000\uff09\u306b\u4fdd\u3063\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>\u30bd\u30d5\u30c8\u30d0\u30a6\u30f3\u30b9<\/strong>\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3084\u30c8\u30ea\u30c3\u30ad\u30fc\u306a\u30c6\u30b9\u30c8\u306e\u5834\u5408\u3001\u79c1\u306f\u4e00\u6642\u7684\u306b\u300c\u306f\u3044\u300d\u306b\u8a2d\u5b9a\u3059\u308b\u3002.<\/li>\n<\/ul>\n\n<p>\u3053\u306e\u3088\u3046\u306a\u5fae\u5999\u306a\u9055\u3044\u304c\u3001\u79c1\u3092\u52a9\u3051\u3066\u304f\u308c\u308b\u3002 <strong>\u5727\u529b<\/strong> \u5168\u4f53\u306e\u671f\u9593\u3092\u4e0d\u5fc5\u8981\u306b\u5ef6\u9577\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u7d0d\u54c1\u304b\u3089\u3002\u79c1\u306f\u53cd\u5fa9\u7684\u306b\u5024\u3092\u8abf\u6574\u3057\u3001\u30e1\u30c8\u30ea\u30af\u30b9\u3092\u76e3\u8996\u3057\u3001\u30b9\u30e2\u30fc\u30eb\u30b9\u30c6\u30c3\u30d7\u3067\u4e0a\u4e0b\u3055\u305b\u308b\u3060\u3051\u3060\u3002.<\/p>\n\n<h2>\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u3068\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n<p>\u5404\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u3001\u97f3\u91cf\u3084\u30d0\u30fc\u30b9\u30c8\u52d5\u4f5c\u306b\u5bfe\u3057\u3066\u7570\u306a\u308b\u53cd\u5fdc\u3092\u793a\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u6b21\u306e\u3088\u3046\u306b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u3066\u3044\u308b\u3002 <strong>\u76ee\u7684\u5730\u3054\u3068<\/strong> \u7c92\u72b6\u3067\u3042\u308b\uff1a<\/p>\n\n<ul>\n  <li><strong>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30fb\u30de\u30c3\u30d7<\/strong>\u5927\u898f\u6a21\u3067\u4f4e\u901f\u306a\u30c9\u30e1\u30a4\u30f3\u306e\u5834\u5408\u3001\u79c1\u306f\u5c02\u7528\u306e\u30ea\u30ec\u30fc\u304b\u3001\u72ec\u81ea\u306e\u5236\u9650\u3092\u8a2d\u3051\u305f\u30d7\u30fc\u30eb\u3092\u7d4c\u7531\u3055\u305b\u3001\u6b8b\u308a\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u81ea\u7531\u306b\u306a\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>smtp_tls_policy_maps<\/strong>\u30d1\u30fc\u30c8\u30ca\u30fc\u30fb\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30fb\u30ea\u30c8\u30e9\u30a4\u3092\u5897\u3084\u3055\u305a\u306bTLS\u3092\u5b9f\u65bd\u3059\u308b\u3002TLS\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u306f\u30014xx\u30ed\u30b8\u30c3\u30af\u304c\u4e88\u5b9a\u901a\u308a\u6709\u52b9\u306b\u306a\u308b\u3002.<\/li>\n  <li><strong>\u30c9\u30e1\u30a4\u30f3\u6bce\u901a\u8ca8<\/strong>\u983b\u7e41\u306b421\/450\u3092\u51fa\u3059\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u306f\u3088\u308a\u53b3\u3057\u3044\u5236\u9650\u3092\u3001\u78ba\u5b9f\u306b\u6a5f\u80fd\u3059\u308b\u30d1\u30fc\u30c8\u30ca\u30fc\u306b\u306f\u3088\u308a\u7de9\u3044\u5236\u9650\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3002.<\/li>\n<\/ul>\n\n<p>\u3053\u306e\u30bb\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3001\u79c1\u306f\u6b21\u306e\u3053\u3068\u3092\u5fc3\u304c\u3051\u3066\u3044\u308b\u3002 <strong>\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb<\/strong> \u3069\u3053\u3067\u3082\u540c\u3058\u30d0\u30fc\u30eb\u3067\u4ed5\u4e8b\u3092\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8a55\u5224\u3068\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u3092\u4e0a\u3052\u308b\u3002.<\/p>\n\n<h2>\u30d0\u30a6\u30f3\u30b9\u7ba1\u7406\u3068\u5f8c\u65b9\u6563\u4e71\u3092\u907f\u3051\u308b<\/h2>\n\n<p>A <strong>\u30af\u30ea\u30a2<\/strong> \u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc\u3068\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc\u3092\u5206\u3051\u308b\u3060\u3051\u3067\u306f\u5341\u5206\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u79c1\u306f\u30af\u30ea\u30fc\u30f3\u30d0\u30a6\u30f3\u30c9\u306b\u3082\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n<ul>\n  <li><strong>bounce_queue_lifetime<\/strong> \u77ed\u304f\u3057\u3066\u304f\u3060\u3055\u3044\uff1a\u9001\u4fe1\u8005\u306f\u3088\u308a\u8fc5\u901f\u306b\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30ad\u30e5\u30fc\u306f\u7121\u99c4\u306e\u306a\u3044\u72b6\u614b\u306b\u4fdd\u305f\u308c\u307e\u3059\u3002.<\/li>\n  <li><strong>\u30bc\u30ed\u30fb\u30ea\u30bf\u30fc\u30f3\u30fb\u30d1\u30b9<\/strong> \u30d0\u30a6\u30f3\u30b9\u306b\u5bfe\u3057\u3066\uff1a\u3053\u308c\u304c\u3001\u79c1\u304c\u7121\u9650\u30eb\u30fc\u30d7\u3092\u907f\u3051\u308b\u65b9\u6cd5\u3060\u3002.<\/li>\n  <li><strong>\u30c0\u30d6\u30eb\u30d0\u30a6\u30f3\u30b9<\/strong> \u304d\u308c\u3044\u306b\u51e6\u7406\u3059\u308b\uff1a\u672a\u914d\u4fe1\u306e\u30d0\u30a6\u30f3\u30b9\u306f\u3001\u30d0\u30c3\u30af\u30b9\u30ad\u30e3\u30c3\u30bf\u30fc\u3092\u767a\u751f\u3055\u305b\u306a\u3044\u3088\u3046\u3001\u7ba1\u7406\u3055\u308c\u305f\u65b9\u6cd5\u3067\u51e6\u7406\u3059\u308b\u3002.<\/li>\n  <li><strong>DSN\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u6d88\u53bb\u3059\u308b<\/strong>\u77ed\u304f\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u3068\u30db\u30b9\u30c8\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u4ed8\u304d\u3002.<\/li>\n<\/ul>\n\n<p>\u4e0d\u78ba\u5b9f\u6027\u306e\u9ad8\u3044\u60c5\u5831\u6e90\uff08\u53e4\u3044\u30ea\u30b9\u30c8\u306a\u3069\uff09\u3092\u53ce\u96c6\u3059\u308b\u5834\u5408\u3001\u79c1\u306f\u305d\u308c\u3092\u6e1b\u3089\u3059\u3002 <strong>\u751f\u6daf<\/strong> \u305d\u3057\u3066\u3001\u30ad\u30e5\u30fc\u304c\u8a70\u307e\u308b\u306e\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u30015xx\u5224\u5b9a\u3092\u597d\u3080\u3002.<\/p>\n\n<h2>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001DNS\u3001IPv6\uff1a\u96a0\u308c\u305f\u30d6\u30ec\u30fc\u30ad<\/h2>\n\n<p>\u591a\u304f\u306e\u5f85\u3061\u884c\u5217\u554f\u984c\u306f <strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u578b<\/strong>:<\/p>\n\n<ul>\n  <li><strong>\u30ea\u30be\u30eb\u30d0\u306e\u54c1\u8cea<\/strong>\u5f85\u3061\u6642\u9593\u306e\u77ed\u3044\u3044\u304f\u3064\u304b\u306e\u9ad8\u6027\u80fdDNS\u30ea\u30be\u30eb\u30d0\u306f\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u6df7\u96d1\u3092\u907f\u3051\u308b\u3002\u79c1\u306fSERVFAIL\u306e\u30d4\u30fc\u30af\u3092\u4e0a\u6d41\u306e\u554f\u984c\u306e\u6307\u6a19\u3068\u3057\u3066\u898b\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>rDNS\/PTR\u3068HELO<\/strong>\u9069\u5207\u306aPTR\u3068\u4e00\u8cab\u6027\u306e\u3042\u308bHELO\u306f\u3001\u30dd\u30ea\u30b7\u30fc\u306e\u62d2\u5426\u306b\u3088\u308b4xx\/5xx\u3092\u6e1b\u3089\u3057\u3001\u518d\u8a66\u884c\u3092\u5e73\u5766\u306b\u4fdd\u3064\u3002.<\/li>\n  <li><strong>\u30a2\u30a4\u30d4\u30fc\u30d6\u30a4\u30b7\u30c3\u30af\u30b9<\/strong>\u79c1\u306f\u901a\u5e38\u3001inet_protocols\u3092all\u306b\u8a2d\u5b9a\u3057\u305f\u307e\u307e\u306b\u3057\u3066\u3044\u308b\u3002IPv6\u306e\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u60aa\u3044\u5834\u5408\u306f\u3001\u539f\u56e0\u304c\u89e3\u6c7a\u3059\u308b\u307e\u3067\u4e00\u6642\u7684\u306bIPv4\u306e\u307f\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3002.<\/li>\n  <li><strong>MTU\/TLS<\/strong>\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u53b3\u3057\u3044TLS\u30cd\u30b4\u30b7\u30a8\u30fc\u30b7\u30e7\u30f3\u304c\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u5ef6\u9577\u3059\u308b\u3002\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u306e\u518d\u5229\u7528\u3068\u9069\u5207\u306a\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u306f\u3001\u30c1\u30e3\u30cd\u30eb\u306e\u30cf\u30f3\u30b0\u30a2\u30c3\u30d7\u3092\u9632\u3050\u306e\u306b\u5f79\u7acb\u3064\u3002.<\/li>\n<\/ul>\n\n<p>\u30af\u30ea\u30fc\u30f3\u306aDNS\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u57fa\u672c\u304c\u76f4\u63a5\u5229\u76ca\u3092\u751f\u3080 <strong>\u77ed\u3044<\/strong> \u306e\u5408\u56f3\u3068\u30ea\u30c8\u30e9\u30a4\u306e\u56de\u6570\u3092\u6e1b\u3089\u3059\u3002.<\/p>\n\n<h2>\u969c\u5bb3\u767a\u751f\u6642\u306e\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u30fb\u30d7\u30ec\u30a4\u30d6\u30c3\u30af<\/h2>\n\n<p>\u30ad\u30e5\u30fc\u304c\u5897\u3048\u305f\u3089\u3001\u79c1\u306f\u884c\u52d5\u3059\u308b <strong>\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u30fc\u30c9<\/strong>:<\/p>\n\n<ul>\n  <li><strong>\u30af\u30a4\u30c3\u30af\u30eb\u30c3\u30af<\/strong>: mailq\u3001qshape\u3001\u30ed\u30b0\u306e\u30b5\u30f3\u30d7\u30eb\u30b9\u30ad\u30e3\u30f3\uff08\u6700\u3082\u983b\u5ea6\u306e\u9ad8\u30444xx\/5xx\uff09\u3002.<\/li>\n  <li><strong>\u30a4\u30b3\u30e9\u30a4\u30ba<\/strong>postsuper -h\u306f\u3001\uff08header_checks\u306b\u3088\u308b\u30d8\u30c3\u30c0\u30fc\u306e\u7279\u5fb4\u306b\u57fa\u3065\u304f\u306a\u3069\uff09\u9078\u629e\u7684\u306a\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u3092\u884c\u3044\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306b\u512a\u5148\u9806\u4f4d\u3092\u3064\u3051\u308b\u3002.<\/li>\n  <li><strong>\u30ea\u30af\u30a8<\/strong>\u30c8\u30ea\u30ac\u30fc(DNS\u3001TLS)\u304c\u4fee\u6b63\u3055\u308c\u305f\u5834\u5408\u306f\u3001postsuper -r ALL\u3001\u307e\u305f\u306f\u30ad\u30e5\u30fcID\u3067\u6307\u5b9a\u3002.<\/li>\n  <li><strong>\u30c9\u30e1\u30a4\u30f3\u30fb\u30d5\u30e9\u30c3\u30b7\u30e5<\/strong>postqueue -s target.domain\u3067\u3001\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u500b\u5225\u306b\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u3002.<\/li>\n  <li><strong>\u975e\u5e38\u30d6\u30ec\u30fc\u30ad<\/strong>\u30cf\u30fc\u30c9\u30d5\u30a7\u30a4\u30eb\u3092\u5897\u3084\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306f\u3001soft_bounce\u3092\u6709\u52b9\u306b\u3059\u308b\u3002.<\/li>\n  <li><strong>\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7<\/strong>postsuper -d QUEUEID \u3067\u500b\u3005\u306e\u4e0d\u826f\u30e1\u30c3\u30bb\u30fc\u30b8\uff08\u30dd\u30a4\u30ba\u30f3\u30fb\u30e1\u30c3\u30bb\u30fc\u30b8\uff09\u3092\u524a\u9664\u3059\u308b\u3002.<\/li>\n<\/ul>\n\n<p>\u3053\u308c\u3089\u306e\u30b9\u30c6\u30c3\u30d7\u306b\u3088\u3063\u3066 <strong>\u30b3\u30a2\u30fb\u30c7\u30ea\u30d0\u30ea\u30fc<\/strong> \u5168\u4f53\u7684\u306a\u8ca0\u8377\u3092\u5897\u3084\u3055\u305a\u306b\u539f\u56e0\u3092\u6392\u9664\u3057\u306a\u304c\u3089\u3001\u30aa\u30fc\u30d7\u30f3\u306b\u3059\u308b\u3002.<\/p>\n\n<h2>\u30ea\u30b9\u30af\u306e\u306a\u3044\u30c6\u30b9\u30c8\u3001\u30b9\u30c6\u30fc\u30b8\u30f3\u30b0\u3001\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8<\/h2>\n\n<p>\u65b0\u3057\u3044\u3053\u3068\u3092\u59cb\u3081\u308b\u524d\u306b <strong>\u9650\u754c<\/strong> 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