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<a href=\"https:\/\/webhosting.de\/ja\/%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e7%8b%ac%e8%87%aa%e3%81%ae%e3%83%89%e3%83%a1%e3%82%a4%e3%83%b3mx%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%89%e3%83%84%e3%83%bc%e3%83%ab%e3%81%ae%e3%82%bb%e3%83%83\/\">MX-\u30ec\u30b3\u30fc\u30c9\u30fb\u30de\u30cb\u30e5\u30a2\u30eb<\/a>, 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<strong>\u30b7\u30fc\u30b1\u30f3\u30b9<\/strong>, \u30e6\u30fc\u30b6\u30fc\u304c\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u7d4c\u9a13\u3059\u308b\u524d\u306b\u9069\u5207\u306a\u512a\u5148\u9806\u4f4d\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30b5\u30dd\u30fc\u30c8\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u6e1b\u3089\u3057\u3001\u914d\u4fe1\u3092\u4e00\u5b9a\u306b\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306b\u3088\u3063\u3066\u306f\u3001\u63a5\u7d9a\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u306e\u3042\u308b\u5236\u9650\u3084\u4e0d\u6b63\u4f7f\u7528\u9632\u6b62\u30eb\u30fc\u30eb\u304c\u3042\u308b\u3053\u3068\u3082\u5ff5\u982d\u306b\u7f6e\u3044\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n<h2>\u30e1\u30fc\u30eb\u914d\u4fe1\u7d4c\u8def\u306e\u30b9\u30c6\u30c3\u30d7\u30fb\u30d0\u30a4\u30fb\u30b9\u30c6\u30c3\u30d7<\/h2>\n<p>\u9001\u4fe1\u6642\u3001\u9001\u4fe1\u30b5\u30fc\u30d0\u30fc\u306f\u53d7\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u3092\u89e3\u6c7a\u3057\u3001MX\u30ec\u30b3\u30fc\u30c9\u3092\u8aad\u307f\u53d6\u308a\u3001\u512a\u5148\u30db\u30b9\u30c8\u3078\u306eSMTP\u63a5\u7d9a\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002 <strong>\u914d\u9001\u7d4c\u8def<\/strong>. .SMTP\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u6210\u529f\u3059\u308b\u3068\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u30b5\u30fc\u30d0\u30fc\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u5165\u308c\u3001\u4fdd\u5b58\u3057\u3001\u5185\u90e8\u7684\u306b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u30b7\u30b9\u30c6\u30e0\u306b\u8ee2\u9001\u3059\u308b\u3002\u305d\u306e\u5f8c\u3001\u53d7\u4fe1\u8005\u306fIMAP\u307e\u305f\u306fPOP3\u7d4c\u7531\u3067\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u306f\u4e26\u884c\u3057\u3066\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u3068\u30a6\u30a3\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u3092\u9069\u7528\u3059\u308b\u3002MX\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u3001\u9001\u4fe1\u8005\u306f\u81ea\u52d5\u7684\u306b\u6b21\u306e\u512a\u5148\u9806\u4f4d\u3092\u8a66\u307f\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3084\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u304c\u767a\u751f\u3057\u3066\u3082\u3001\u914d\u4fe1\u306f\u53ef\u80fd\u306a\u307e\u307e\u3067\u3059\u3002.<\/p>\n<p>\u79c1\u306f\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u3001dig\/host\u3084\u3001Telnet\u3084OpenSSL\u3092\u4f7f\u3063\u305f\u77ed\u3044SMTP\u30c6\u30b9\u30c8\u306a\u3069\u306e\u30c4\u30fc\u30eb\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u3002\u3053\u308c\u3089\u306e\u30c1\u30a7\u30c3\u30af\u306b\u3088\u308a\u3001DNS\u3068MX\u30c1\u30a7\u30fc\u30f3\u304c\u6b63\u3057\u304f\u6a5f\u80fd\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u304c\u6570\u79d2\u3067\u308f\u304b\u308b\u3002\u30db\u30b9\u30c8\u89e3\u6c7a\u304c\u6b63\u3057\u304f\u306a\u304b\u3063\u305f\u308a\u3001\u5b9b\u5148\u540d\u306b\u30bf\u30a4\u30d7\u30df\u30b9\u304c\u3042\u3063\u305f\u308a\u3059\u308b\u3068\u3001\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u306f\u5373\u5ea7\u306b\u30a8\u30e9\u30fc\u306b\u7d42\u308f\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u307e\u305a\u5b89\u5b9a\u3057\u305fDNS\u30d9\u30fc\u30b9\u3092\u8a2d\u5b9a\u3057\u3001\u305d\u308c\u304b\u3089\u5b9a\u671f\u7684\u306a\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3092\u884c\u3044\u307e\u3059\u3002 <strong>\u5c0f\u5207\u624b<\/strong> \u904b\u55b6\u30c1\u30fc\u30e0\u306b\u3068\u3063\u3066\u3064\u307e\u308a\u3001DNS\u304b\u3089\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u307e\u3067\u306e\u7d4c\u8def\u306f\u900f\u904e\u7684\u3067\u8ffd\u8de1\u53ef\u80fd\u306a\u307e\u307e\u3067\u3042\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\/03\/emailroutingbesprechung3452.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u4ee3\u8868\u7684\u306a\u69cb\u6210\u3068\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u6226\u7565<\/h2>\n<p>\u591a\u304f\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u540c\u3058\u30e9\u30f3\u30af\u306eMX\u30db\u30b9\u30c8\u30922\u3064\u304b3\u3064\u4f7f\u3044\u3001\u3088\u308a\u9ad8\u3044\u30e9\u30f3\u30af\u306e\u7d14\u7c8b\u306a\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30db\u30b9\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002 <strong>\u512a\u5148\u9806\u4f4d<\/strong>. .\u3053\u308c\u306f\u3001\u8ca0\u8377\u5206\u6563\u3068\u660e\u78ba\u306a\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u30fb\u30ec\u30d9\u30eb\u3092\u517c\u306d\u5099\u3048\u3066\u3044\u308b\u3002\u5c0f\u898f\u6a21\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306e\u5834\u5408\u3001\u30d7\u30e9\u30a4\u30de\u30ea1\u3064\uff0b\u30d0\u30c3\u30af\u30a2\u30c3\u30d71\u3064\u3067\u5341\u5206\u306a\u3053\u3068\u304c\u591a\u304f\u3001\u4e21\u65b9\u306e\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u5225\u3005\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u79c1\u306f\u3001mx01.domain.tld\u3001mx02.domain.tld\u3001mxb.domain.tld\u306e\u3088\u3046\u306a\u30db\u30b9\u30c8\u540d\u3092\u8a71\u3059\u3053\u3068\u3092\u597d\u307f\u307e\u3059\u3002\u3069\u306e\u30db\u30b9\u30c8\u304c\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u5165\u308c\u305f\u304b\u3092\u30ed\u30b0\u3067\u3059\u3050\u306b\u8a8d\u8b58\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3059\u3002.<\/p>\n<p>\u6b21\u306e\u8868\u306f\u3001\u3088\u304f\u3042\u308b\u30d1\u30bf\u30fc\u30f3\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3001\u81ea\u5206\u306e\u30d7\u30e9\u30f3\u30cb\u30f3\u30b0\u3092\u69cb\u6210\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u79c1\u306f\u4f8b\u3092\u5f79\u5272\u3054\u3068\u306b\u6574\u7406\u3057\u3001\u4f1a\u793e\u306b\u3064\u3044\u3066\u306e\u30e1\u30e2\u3092\u52a0\u3048\u3066\u3044\u308b\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u69cb\u9020\u3092\u3059\u3050\u306b\u81ea\u5206\u306e\u4f1a\u793e\u306b\u79fb\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30e1\u30fc\u30eb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0<\/strong> \u305d\u3057\u3066\u5931\u6557\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3002.<\/p>\n<table>\n  <thead>\n    <tr>\n      <th>\u512a\u5148\u9806\u4f4d<\/th>\n      <th>\u30db\u30b9\u30c8\u540d<\/th>\n      <th>\u5f79\u5272<\/th>\n      <th>\u30d2\u30f3\u30c8<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>10<\/td>\n      <td>mx01.example.de<\/td>\n      <td>\u4e3b\u306b<\/td>\n      <td>\u4e3b\u306a\u76ee\u7684\uff1a\u9ad8\u53ef\u7528\u6027\u3001\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/td>\n    <\/tr>\n    <tr>\n      <td>10<\/td>\n      <td>mx02.example.de<\/td>\n      <td>\u30d7\u30e9\u30a4\u30de\u30ea\u30fc\uff08\u540c\u683c\uff09<\/td>\n      <td>mx01\u3068\u8ca0\u8377\u3092\u5171\u6709\u3002<\/td>\n    <\/tr>\n    <tr>\n      <td>20<\/td>\n      <td>mxbackup.example.de<\/td>\n      <td>\u30d0\u30c3\u30af\u30a2\u30c3\u30d7<\/td>\n      <td>\u969c\u5bb3\u767a\u751f\u6642\u306b\u30b9\u30a4\u30c3\u30c1\u304c\u5165\u308b\u3002<\/td>\n    <\/tr>\n    <tr>\n      <td>30<\/td>\n      <td>filter.example.de<\/td>\n      <td>\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4<\/td>\n      <td>\u4e0a\u6d41\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306e\u307f\u3002<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n<p>\u79c1\u306f\u305d\u308c\u305e\u308c\u306e\u8a2d\u5b9a\u3092\u5b9f\u969b\u306b\u914d\u4fe1\u3057\u3066\u30c6\u30b9\u30c8\u3057\u3001\u3059\u3079\u3066\u306e\u30db\u30b9\u30c8\u306e\u30ed\u30b0\u3092\u6bd4\u8f03\u3059\u308b\u3002\u3059\u3079\u3066\u306e\u30d1\u30b9\u304c\u6b63\u5e38\u306b\u52d5\u4f5c\u3059\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u304b\u3089\u3001\u30c6\u30b9\u30c8\u8a08\u753b\u3092\u3044\u304f\u3064\u304b\u306e\u5b9a\u671f\u7684\u306a\u30c1\u30a7\u30c3\u30af\u306b\u77ed\u7e2e\u3057\u307e\u3059\u3002 <strong>\u5c0f\u5207\u624b<\/strong>. .\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u7121\u99c4\u306e\u306a\u3044\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3057\u3001\u969c\u5bb3\u3078\u306e\u5bfe\u5fdc\u6642\u9593\u3092\u77ed\u304f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u90f5\u4fbf\u7269\u306e\u91cf\u304c\u591a\u3044\u62e0\u70b9\u3067\u306f\u3001\u660e\u78ba\u306a\u30a2\u30e9\u30fc\u30e0\u3057\u304d\u3044\u5024\u3092\u8a2d\u5b9a\u3057\u305f\u30ad\u30e3\u30d1\u30b7\u30c6\u30a3\u30fb\u30d7\u30e9\u30f3\u30cb\u30f3\u30b0\u3082\u6709\u52b9\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u7279\u306b\u8ca0\u8377\u304c\u30d4\u30fc\u30af\u306b\u9054\u3057\u3066\u3044\u308b\u3068\u304d\u306b\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>TTL\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u30b5\u30d7\u30e9\u30a4\u30ba\u306e\u306a\u3044\u4f1d\u64ad<\/h2>\n<p>TTL \u5024\u306f\u3001\u30ea\u30be\u30eb\u30d0\u304c MX \u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u6642\u9593\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002 <strong>3600s<\/strong>, \u3068\u3044\u3046\u306e\u3082\u3001\u3053\u306e\u65b9\u304c\u5909\u66f4\u304c\u3088\u308a\u65e9\u304f\u898b\u3048\u308b\u304b\u3089\u3067\u3042\u308b\u3002\u77ed\u3044TTL\u306f\u8a08\u753b\u7684\u306a\u5909\u66f4\u306e\u524d\u306b\u9069\u3057\u3066\u304a\u308a\u3001\u9577\u3044TTL\u306f\u9591\u6563\u671f\u306eDNS\u8ca0\u8377\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002\u5909\u66f4\u5f8c\u306f\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u306b\u3082\u3088\u308a\u307e\u3059\u304c\u3001\u3059\u3079\u3066\u306e\u9001\u4fe1\u8005\u304c\u65b0\u3057\u3044MX\u3092\u898b\u308b\u306b\u306f\u5c11\u3057\u5fcd\u8010\u304c\u5fc5\u8981\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u30b3\u30a2\u30bf\u30a4\u30e0\u4ee5\u5916\u306e\u6642\u9593\u5e2f\u306b\u5909\u66f4\u3092\u8a08\u753b\u3057\u3001\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u6e96\u5099\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u51b7\u9759\u306b\u8a08\u753b\u3092\u7acb\u3066\u308c\u3070\u3001\u591c\u52e4\u3084\u660e\u3089\u304b\u306a\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n<p>\u307e\u305f\u3001\u95a2\u4fc2\u3059\u308b\u3059\u3079\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u306eTTL\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u3053\u3068\u3082\u91cd\u8981\u3067\u3042\u308b\uff1aMX\u3001A\/AAA\u3001\u305d\u3057\u3066\u8a72\u5f53\u3059\u308b\u5834\u5408\u306fCNAME\u5b9b\u5148\u3002\u7570\u306a\u308b\u30e9\u30f3\u30bf\u30a4\u30e0\u306f\u4e00\u6642\u7684\u306b\u6df7\u5728\u3057\u305f\u72b6\u614b\u3092\u4f5c\u308a\u51fa\u3057\u307e\u3059\u3002\u7ba1\u7406\u3055\u308c\u305fTTL\u30a6\u30a3\u30f3\u30c9\u30a6\u3068\u660e\u78ba\u306a\u30de\u30a4\u30eb\u30b9\u30c8\u30fc\u30f3\u3067\u3001\u79c1\u306f\u5909\u66f4\u3092\u660e\u78ba\u306b\u4fdd\u3061\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u3001\u8907\u6570\u306e\u72ec\u7acb\u3057\u305f\u30ea\u30be\u30eb\u30d0\u306b\u3088\u308b\u6700\u7d42\u30c1\u30a7\u30c3\u30af\u304c\u542b\u307e\u308c\u308b\u3002\u3053\u306e\u30eb\u30fc\u30c1\u30f3\u306f <strong>\u79fb\u4f4f<\/strong> \u305d\u306e\u904e\u7a0b\u3067\u306e\u51b7\u9759\u3055\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\/03\/mx-records-email-priority-ef76.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>Microsoft 365\u3068Google Workspace\u306eMX\u30ec\u30b3\u30fc\u30c9\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n<p>Microsoft 365\u3084Google Workspace\u306b\u79fb\u884c\u3059\u308b\u5834\u5408\u306f\u3001\u65e2\u5b58\u306eMX\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u5b8c\u5168\u306b\u7f6e\u304d\u63db\u3048\u308b\u3002 <strong>\u30b5\u30fc\u30d3\u30b9<\/strong>. .\u30ed\u30fc\u30ab\u30eb\u30fb\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3068\u5916\u90e8\u30b9\u30a4\u30fc\u30c8\u306e\u6df7\u5728\u3057\u305f\u30b3\u30f3\u30b9\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u305d\u3046\u3057\u306a\u3044\u3068\u3059\u3050\u306b\u30eb\u30fc\u30d7\u306b\u9665\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u4f59\u8a08\u306a\u8ee2\u9001\u3092\u524a\u9664\u3057\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30eb\u30fc\u30eb\u3092\u30c0\u30d6\u30eb\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u307e\u305f\u3001SPF\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u65b0\u3057\u3044\u9001\u4fe1IP\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3082\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u3053\u308c\u304c\u3001\u5236\u9650\u306e\u591a\u3044\u53d7\u4fe1\u8005\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u308b\u62d2\u5426\u3092\u907f\u3051\u308b\u552f\u4e00\u306e\u65b9\u6cd5\u3067\u3059\u3002.<\/p>\n<p>MX\u304c\u5207\u308a\u66ff\u308f\u3063\u305f\u5f8c\u3001\u79c1\u306f\u3044\u3064\u3082\u5916\u3068\u4e2d\u304b\u3089\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u3092\u30c6\u30b9\u30c8\u3057\u3066\u3001\u56de\u7dda\u3068\u30ea\u30bf\u30fc\u30f3\u30eb\u30fc\u30c8\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30b9\u30a4\u30fc\u30c8\u3068\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u30ed\u30b0\u306b\u306f\u3001\u3069\u306eMX\u304c\u6709\u52b9\u306b\u306a\u3063\u305f\u304b\u304c\u660e\u78ba\u306b\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u30b9\u30d1\u30e0\u3068\u30de\u30eb\u30a6\u30a7\u30a2\u306e\u30dd\u30ea\u30b7\u30fc\u3092\u65b0\u3057\u3044\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306b\u5408\u308f\u305b\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u4e00\u8cab\u3057\u305f <strong>\u30dd\u30ea\u30b7\u30fc<\/strong> \u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u308f\u305f\u3063\u3066\u3002\u304d\u308c\u3044\u306b\u79fb\u884c\u3057\u305f\u4eba\u306f\u3001\u7fcc\u65e5\u306b\u5acc\u306a\u9a5a\u304d\u3092\u7d4c\u9a13\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u3060\u308d\u3046\u3002.<\/p>\n\n<h2>\u5b9f\u8df5\uff1a\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d1\u30cd\u30eb\u3067MX\u3092\u8a2d\u5b9a\u3059\u308b<\/h2>\n<p>\u307b\u3068\u3093\u3069\u306e\u30d1\u30cd\u30eb\u3067\u306f\u3001DNS\u7ba1\u7406\u3092\u958b\u304d\u3001MX\u30bf\u30a4\u30d7\u3092\u9078\u629e\u3057\u3001\u30db\u30b9\u30c8\u540d\u3001\u5b9b\u5148\u3001\u512a\u5148\u5ea6\u3092\u8a2d\u5b9a\u3057\u3001TTL\u3092\u8a2d\u5b9a\u3057\u3001\u4fdd\u5b58\u3057\u307e\u3059\u3002 <strong>\u4fee\u6b63<\/strong>. .\u305d\u306e\u5f8c\u3001\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u8868\u793a\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u624b\u52d5\u3067dig\/host\u30c1\u30a7\u30c3\u30af\u3092\u958b\u59cb\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u5916\u90e8\u30a2\u30ab\u30a6\u30f3\u30c8\u304b\u3089\u306e\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u3092\u30c6\u30b9\u30c8\u3057\u3001\u30d8\u30c3\u30c0\u30fc\u306eaccepted MX\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u89e3\u6c7a\u7d50\u679c\u304c\u307e\u3060\u53e4\u3044\u5024\u3092\u793a\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001TTL\u30e9\u30f3\u30bf\u30a4\u30e0\u3092\u5f85\u3063\u3066\u518d\u5ea6\u691c\u8a3c\u3057\u307e\u3059\u3002\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3068\u914d\u9001\u304c\u30af\u30ea\u30fc\u30f3\u306a\u72b6\u614b\u306b\u306a\u3063\u3066\u521d\u3081\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u6e96\u5099\u304c\u3067\u304d\u305f\u3053\u3068\u3092\u901a\u77e5\u3057\u307e\u3059\u3002.<\/p>\n<p>\u3061\u3087\u3063\u3068\u3057\u305f\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001\u79c1\u306f\u30db\u30b9\u30c8\u540d\u3092\u7d71\u4e00\u3057\u3001\u30d7\u30e9\u30a4\u30de\u30ea\u3001\u30d7\u30e9\u30a4\u30de\u30ea2\u3001\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3068\u3044\u3063\u305f\u3088\u3046\u306b\u3001\u305d\u308c\u305e\u308c\u306e\u512a\u5148\u9806\u4f4d\u3092\u76ee\u7684\u3068\u3068\u3082\u306b\u6587\u66f8\u5316\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u660e\u78ba\u3055\u306f\u969c\u5bb3\u89e3\u6790\u306b\u975e\u5e38\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u307e\u305f\u3001\u904e\u53bb\u306eMX\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u306a\u3044\u3053\u3068\u3082\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002\u53e4\u3044\u5b9b\u5148\u306f\u3057\u3070\u3057\u3070 <strong>\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3<\/strong>. .\u7c21\u5358\u306aDNA\u885b\u751f\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308c\u3070\u3001\u9577\u3044\u5207\u7b26\u3092\u5207\u3089\u305a\u306b\u6e08\u3080\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\/03\/MXRecordsRouting_3927.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3092\u7d20\u65e9\u304f\u4fee\u6b63<\/h2>\n<p>\u4e0d\u9069\u5207\u306a\u512a\u5148\u9806\u4f4d\u306f\u3001\u9069\u5207\u3067\u306a\u3044\u30db\u30b9\u30c8\u3078\u306e\u4e0d\u5fc5\u8981\u306a\u914d\u4fe1\u3092\u8a66\u307f\u307e\u3059\u3002 <strong>\u4fa1\u5024\u89b3<\/strong> \u3059\u3050\u306b\u3082\u3046\u4e00\u5ea6\u30c6\u30b9\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u914d\u4fe1\u5148\u30db\u30b9\u30c8\u306e\u30bf\u30a4\u30d7\u30df\u30b9\u306f\u914d\u4fe1\u3092\u505c\u6b62\u3055\u305b\u308b\u306e\u3067\u3001\u30b9\u30da\u30eb\u3092\u5ff5\u5165\u308a\u306b\u78ba\u8a8d\u3059\u308b\u3002\u30d0\u30c3\u30af\u30a2\u30c3\u30d7MX\u306e\u6b20\u843d\u306f\u969c\u5bb3\u767a\u751f\u6642\u306b\u5384\u4ecb\u306a\u306e\u3067\u3001\u5c11\u306a\u304f\u3068\u30821\u3064\u306e\u4ee3\u66ff\u30eb\u30fc\u30c8\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3002\u5fd8\u308c\u305f\u53e4\u3044\u30a8\u30f3\u30c8\u30ea\u30fc\u306f\u6563\u767a\u7684\u306a\u30df\u30b9\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u5f15\u304d\u8d77\u3053\u3059\u306e\u3067\u3001\u79c1\u306f\u4e00\u8cab\u3057\u3066\u6642\u4ee3\u9045\u308c\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3057\u3066\u3044\u308b\u3002\u30d7\u30ed\u30d1\u30b2\u30fc\u30b7\u30e7\u30f3\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u5834\u5408\u306f\u3001\u3053\u306e\u30d5\u30a7\u30fc\u30ba\u3092\u900f\u904e\u7684\u306b\u8a08\u753b\u3057\u30011\u5206\u3054\u3068\u306b\u30ea\u30bb\u30fc\u30d6\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8f9b\u62b1\u5f37\u304f\u5f85\u3061\u307e\u3059\u3002.<\/p>\n<p>\u30db\u30b9\u30c8\u304c\u57f7\u62d7\u306a\u62d2\u5426\u3092\u793a\u3059\u5834\u5408\u3001\u79c1\u306f\u30b9\u30d1\u30e0\u30dd\u30ea\u30b7\u30fc\u3001\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u3001TLS\u8981\u4ef6\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u30ed\u30b0\u304b\u3089\u3001\u30ec\u30fc\u30c8\u5236\u9650\u3084\u30d6\u30ed\u30c3\u30af\u30ea\u30b9\u30c8\u304c\u539f\u56e0\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u5909\u66f4\u5f8c\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3057\u3066\u81ea\u7531\u306b\u5206\u6790\u3057\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3055\u308c\u305f\u53cd\u5fdc\u306b\u3088\u3063\u3066 <strong>\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0<\/strong> \u305d\u3057\u3066\u614c\u305f\u3060\u3057\u3044\u7d50\u679c\u7684\u640d\u5bb3\u3092\u907f\u3051\u308b\u3002\u826f\u3044\u30e1\u30e2\u304c\u3001\u3053\u3053\u3067\u306e\u3059\u3079\u3066\u306e\u9055\u3044\u3092\u751f\u3080\u3002.<\/p>\n\n<h2>\u914d\u4fe1\u53ef\u80fd\u6027\u306e\u5f37\u5316\uff1aSPF\u3001DKIM\u3001DMARC<\/h2>\n<p>\u30af\u30ea\u30fc\u30f3\u306aMX\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306f\u3001\u914d\u4fe1\u306e\u8ab2\u984c\u306e\u4e00\u90e8\u3092\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3067\u3042\u308b\u3002 <strong>\u8a8d\u8a3c<\/strong>. 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href=\"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bcauth%e3%82%b5\/\">SPF\u3001DKIM\u3001DMARC<\/a>, 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<a href=\"https:\/\/webhosting.de\/ja\/dns%e7%ae%a1%e7%90%86%e3%81%ae%e3%83%99%e3%82%b9%e3%83%88%e3%83%97%e3%83%a9%e3%82%af%e3%83%86%e3%82%a3%e3%82%b9%e3%81%ae%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%b3%e3%82%b9%e3%83%81\/\">\u30aa\u30fc\u30eb\u30a4\u30f3\u30af\u30eb\u306eDNS\u7ba1\u7406<\/a>, 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\u30d7\u30e9\u30a4\u30de\u30ea\u30db\u30b9\u30c8\u3068\u540c\u3058\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u540c\u4e00\u306e\u30a2\u30f3\u30c1\u30b9\u30d1\u30e0\u30eb\u30fc\u30eb\u3001\u30b0\u30ec\u30a4\u30ea\u30b9\u30c8\u52d5\u4f5c\u3001\u53d7\u4fe1\u8005\u30c1\u30a7\u30c3\u30af\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u306f\u4e0d\u660e\u306a\u53d7\u4fe1\u8005\u3092\u8a8d\u8b58\u3059\u308b <strong>\u540c\u6642\u306b<\/strong> SMTP\u30c0\u30a4\u30a2\u30ed\u30b0\u306e\uff08\u30b3\u30fc\u30eb\u30a2\u30a6\u30c8\u307e\u305f\u306f\u540c\u671f\u5316\u53d7\u4fe1\u8005\u30de\u30c3\u30d7\u306a\u3069\u306b\u3088\u308b\u53d7\u4fe1\u8005\u78ba\u8a8d\uff09\u3001\u304a\u3088\u3073\u53d7\u8afe\u5f8c\u306b\u306e\u307fNDR\u3092\u751f\u6210\u3057\u306a\u3044\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u30b9\u30d1\u30de\u30fc\u306f\u610f\u56f3\u7684\u306b\u300c\u30bd\u30d5\u30c8\u306a\u300d\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u9078\u3076\u3002.<\/p>\n<p>\u30ad\u30e5\u30fc\u306b\u3064\u3044\u3066\u306f\u3001\u4fdd\u5b88\u7684\u3060\u304c\u9650\u5b9a\u7684\u306a\u30ea\u30c6\u30f3\u30b7\u30e7\u30f3\uff082\u301c5\u65e5\u7a0b\u5ea6\uff09\u3068\u8ffd\u8de1\u53ef\u80fd\u306a\u30ea\u30c8\u30e9\u30a4\u9593\u9694\u3092\u8a08\u753b\u3057\u3066\u3044\u308b\u3002\u969c\u5bb3\u304c\u6c17\u3065\u304b\u306a\u3044\u3046\u3061\u306b\u8f3b\u8f33\u306b\u3064\u306a\u304c\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u30cf\u30fc\u30c9\u30c7\u30a3\u30b9\u30af\u306e\u7a7a\u304d\u5bb9\u91cf\u3001\u30ad\u30e5\u30fc\u306e\u9577\u3055\u3001\u9045\u5ef6\u7387\u3092\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002\u30d0\u30c3\u30af\u30a2\u30c3\u30d7MX\u306f\u3001\u30d7\u30e9\u30a4\u30de\u30ea\u304c\u3059\u3067\u306b\u914d\u4fe1\u5bfe\u8c61\u306b\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u30b9\u30de\u30fc\u30c8\u30db\u30b9\u30c8\u3068\u3057\u3066\u6c7a\u3057\u3066\u30d7\u30e9\u30a4\u30de\u30ea\u3092\u53c2\u7167\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3002 <strong>\u30eb\u30fc\u30d7<\/strong>. .\u307e\u305f\u91cd\u8981\u306a\u3053\u3068\u3068\u3057\u3066\u3001\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30db\u30b9\u30c8\u306eHELO\/EHLO ID\u3068\u30d0\u30ca\u30fc\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3067\u3001\u9001\u4fe1\u8005\u306f\u4fe1\u983c\u3092\u4fdd\u6301\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30ed\u30b0\u3092\u660e\u78ba\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>MX\u30db\u30b9\u30c8\u3067\u306e\u30c7\u30e5\u30a2\u30eb\u30b9\u30bf\u30c3\u30af\u3001TLS\u3001\u8a3c\u660e\u66f8<\/h2>\n<p>\u79c1\u306fMX-Hosts\u306e\u904b\u7528\u3092\u597d\u3080 <strong>\u30c7\u30e5\u30a2\u30eb\u30b9\u30bf\u30c3\u30af<\/strong> A\u30ec\u30b3\u30fc\u30c9\u3068AAAA\u30ec\u30b3\u30fc\u30c9\u3067\u3002\u591a\u304f\u306e\u9001\u4fe1\u8005\u306f\u3001\u307e\u305aIPv6\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3002\u30dd\u30fc\u30c825 v6\u304c\u9589\u3058\u3089\u308c\u3066\u3044\u308b\u304b\u5236\u9650\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u306fIPv4\u306b\u5207\u308a\u66ff\u308f\u308b\u304c\u3001\u305d\u306e\u904e\u7a0b\u3067\u6642\u9593\u304c\u5931\u308f\u308c\u308b\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u306f\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u304c\u4e21\u65b9\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u30dd\u30fc\u30c825\u3092\u89e3\u653e\u3057\u3001ICMP\u304c\u57fa\u672c\u7684\u306b\u8a31\u53ef\u3055\u308c\uff08\u30d1\u30b9MTU\u306e\u305f\u3081\uff09\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u304c\u4e21\u65b9\u306e\u30b9\u30bf\u30c3\u30af\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002STARTTLS\u306b\u3064\u3044\u3066\u306f\u3001SAN\u5185\u306e\u7279\u5b9a\u306eMX\u30db\u30b9\u30c8\u540d\u3092\u4f1d\u3048\u308b\u8a3c\u660e\u66f8\u3092\u8a2d\u5b9a\u3059\u308b\u3002\u30ce\u30fc\u30c9\u6570\u304c\u591a\u3044\u5834\u5408\u306f\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u304c\u5f79\u7acb\u3061\u307e\u3059\u304c\u3001\u3084\u306f\u308a\u660e\u78ba\u3067\u660e\u793a\u7684\u306a\u30a8\u30f3\u30c8\u30ea\u30fc\u304c\u671b\u307e\u3057\u3044\u3067\u3059\u3002.<\/p>\n<p>\u30aa\u30d7\u30b7\u30e7\u30f3\u3068\u3057\u3066\u3001MTA-STS\u3092\u7a4f\u3084\u304b\u306a \u201e\u30c6\u30b9\u30c8 \u201c\u30d5\u30a7\u30fc\u30ba\u3067\u8a2d\u5b9a\u3057\u3001\u7d50\u679c\u304c\u5b89\u5b9a\u3057\u3066\u304b\u3089 \u201e\u5f37\u5236 \u201c\u306b\u5207\u308a\u66ff\u3048\u307e\u3059\u3002DANE\uff08TLSA\uff09\u306fDNSSEC\u3067\u88dc\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002TLSA\u30ec\u30b3\u30fc\u30c9\u306b\u6b20\u9665\u304c\u3042\u308b\u3068\u3001\u7740\u4fe1\u63a5\u7d9a\u306b\u6df1\u523b\u306a\u969c\u5bb3\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u3001DNS\u30c1\u30a7\u30fc\u30f3\u306f\u7279\u306b\u6ce8\u610f\u6df1\u304f\u30c1\u30a7\u30c3\u30af\u3059\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\/03\/email-routing-hosting-9217.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30b9\u30d7\u30ea\u30c3\u30c8\u30fb\u30db\u30e9\u30a4\u30ba\u30f3\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3001\u5185\u90e8\u30eb\u30fc\u30c8<\/h2>\n<p>\u5185\u90e8\u3068\u5916\u90e8\u306e\u53d7\u4fe1\u8005\u304c\u5206\u304b\u308c\u3066\u3044\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001\u79c1\u306f\u3088\u304f <strong>\u30b9\u30d7\u30ea\u30c3\u30c8\u30fb\u30db\u30e9\u30a4\u30be\u30f3\u30fbDNS<\/strong> \u5916\u90e8\u30ea\u30be\u30eb\u30d0\u306f\u30d1\u30d6\u30ea\u30c3\u30afMX\u5b9b\u5148\u3092\u8868\u793a\u3057\u3001\u5185\u90e8\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u5185\u90e8\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u307e\u305f\u306f\u76f4\u63a5\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u30b5\u30fc\u30d0\u3078\u306eMX\u30a8\u30f3\u30c8\u30ea\u3092\u53d7\u4fe1\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5f85\u3061\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u7d4c\u7531\u306e\u4e0d\u8981\u306a\u8fc2\u56de\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5185\u90e8\u30be\u30fc\u30f3\u304c\u8aa4\u3063\u3066\u5916\u90e8\u306b\u516c\u958b\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3001\u547d\u540d\u898f\u5247\u304c\u4e00\u8cab\u6027\u3092\u4fdd\u3064\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n<p>\u30a2\u30c3\u30d7\u30b9\u30c8\u30ea\u30fc\u30e0\u30d5\u30a3\u30eb\u30bf\u3084DLP\u30b7\u30b9\u30c6\u30e0\u304c\u3042\u308b\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u74b0\u5883\u3067\u306f\u3001MX\u306e\u5b9b\u5148\u304c\u5c02\u7528\u306e\u30a4\u30f3\u30b0\u30ec\u30b9\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3060\u3051\u3092\u8868\u793a\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\u5185\u90e8\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u30eb\u30fc\u30eb\u306f\u3001\u5916\u90e8\u304b\u3089\u53d7\u3051\u5165\u308c\u305f\u30e1\u30fc\u30eb\u304c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u9001\u308a\u8fd4\u3055\u308c\u308b\u3088\u3046\u306a\u3053\u3068\u304c\u3042\u3063\u3066\u306f\u306a\u3089\u306a\u3044\u3002\u3059\u3079\u3066\u306e\u30eb\u30fc\u30c8\uff08\u53d7\u4fe1\u3001\u5185\u90e8\u3001\u9001\u4fe1\uff09\u306e\u65b9\u5411\u3092\u6587\u66f8\u5316\u3057\u3001\u5927\u304d\u306a\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u3001NDR\u3001\u8ee2\u9001\u306a\u3069\u306e\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u3092\u5177\u4f53\u7684\u306b\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002\u3053\u3046\u3057\u3066 <strong>\u914d\u9001\u7d4c\u8def<\/strong> \u30eb\u30fc\u30d7\u3082\u884c\u304d\u6b62\u307e\u308a\u3082\u306a\u3044\u3002.<\/p>\n\n<h2>\u79e9\u5e8f\u3042\u308b\u79fb\u884c\uff1a\u30b9\u30c6\u30c3\u30d7\u30b7\u30fc\u30b1\u30f3\u30b9\u3068\u30ed\u30fc\u30eb\u30d0\u30c3\u30af<\/h2>\n<p>MX\u306e\u5207\u308a\u66ff\u3048\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306f\u30ea\u30fc\u30c9\u30ec\u30d9\u30eb\u3068\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u30ec\u30d9\u30eb\u306e\u660e\u78ba\u306a\u30bf\u30a4\u30e0\u30c6\u30fc\u30d6\u30eb\u306b\u5f93\u3063\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li>\u30a4\u30f3\u30d9\u30f3\u30c8\u30ea\uff1a\u73fe\u5728\u306eMX\u3001\u30db\u30b9\u30c8\u89e3\u6c7a\u3001\u8a3c\u660e\u66f8\u3001\u30dd\u30ea\u30b7\u30fc\u3001\u76e3\u8996\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002.<\/li>\n  <li>\u5909\u66f4\u524d\u306e\u4f59\u88d5\u3092\u3082\u3063\u3066\u3001TTL: MX\u3068\u30bf\u30fc\u30b2\u30c3\u30c8\u30db\u30b9\u30c8\u3092600-1800\u79d2\u306b\u77ed\u7e2e\u3059\u308b\u3002.<\/li>\n  <li>\u65b0\u3057\u3044\u5b9b\u5148\u3092\u63a5\u7d9a\u3059\u308b\uff1a\u307e\u305a\u512a\u5148\u9806\u4f4d\u306e\u9ad8\u3044\u756a\u53f7\u3067\u65b0\u3057\u3044MX\u3092\u5165\u529b\u3057\u3001\u30c6\u30b9\u30c8\u3092\u914d\u4fe1\u3055\u305b\u3001\u30ed\u30b0\u3092\u76e3\u8996\u3059\u308b\u3002.<\/li>\n  <li>\u6a5f\u80fd\u6027\u306e\u8a3c\u660e\uff1aSMTP\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u3001TLS\u3001\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u3001\u53d7\u4fe1\u8005\u30c1\u30a7\u30c3\u30af\u3001\u30ad\u30e5\u30fc\u306e\u52d5\u4f5c\u3092\u5b9f\u969b\u306e\u30e1\u30fc\u30eb\u3067\u691c\u8a3c\u3002.<\/li>\n  <li>\u5207\u308a\u66ff\u3048\uff1a\u65b0\u3057\u3044\u30d7\u30e9\u30a4\u30de\u30ea\u3092\u6700\u4f4e\u306e\u756a\u53f7\u306b\u512a\u5148\u3057\u3001\u4e00\u6642\u7684\u306b\u76e3\u8996\u306e\u3057\u304d\u3044\u5024\u3092\u53b3\u3057\u304f\u3059\u308b\u3002.<\/li>\n  <li>\u89b3\u5bdf\uff1a24\uff5e48\u6642\u9593\u6ce8\u610f\u6df1\u304f\u89b3\u5bdf\u3057\u3001\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3068\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u306b\u6ce8\u610f\u3059\u308b\u3002.<\/li>\n  <li>\u53e4\u3044MX\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u524a\u9664\u3001TTL\u306e\u518d\u4e0a\u6607\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u66f4\u65b0\u3002.<\/li>\n  <li>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u6e96\u5099\uff1a\u53e4\u3044\u30a4\u30f3\u30d5\u30e9\u304c\u6b8b\u3063\u3066\u3044\u308b\u9650\u308a\u3001\u7570\u5e38\u304c\u3042\u308c\u3070\u3059\u3050\u306b\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u304d\u308b\u3002.<\/li>\n<\/ul>\n<p>\u3053\u306e\u898f\u5f8b\u304c\u3042\u308c\u3070\u3001\u5927\u898f\u6a21\u306a\u64a4\u53bb\u3067\u3082\u76ee\u7acb\u3064\u3053\u3068\u306a\u304f\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <strong>\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0<\/strong> 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<strong>\u7d71\u4e00\u9650\u5ea6\u984d<\/strong> 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