{"id":11733,"date":"2021-01-22T04:35:42","date_gmt":"2021-01-22T04:35:42","guid":{"rendered":"https:\/\/blog.benchmarkemail.wpengine.com\/?p=5477"},"modified":"2025-10-21T04:44:20","modified_gmt":"2025-10-21T04:44:20","slug":"error-codes-of-bounced-emails","status":"publish","type":"post","link":"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/","title":{"rendered":"\u30e1\u30fc\u30eb\u914d\u4fe1\u304c\u5931\u6557\u3057\u305f\u6642\u306e\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u4e00\u89a7\uff01\u30a8\u30e9\u30fc\u5185\u5bb9\u3092\u628a\u63e1\u3057\u3066\u914d\u4fe1\u30ea\u30b9\u30c8\u306e\u8cea\u3092\u9ad8\u3081\u3088\u3046"},"content":{"rendered":"<p>\u7a81\u7136\u3067\u3059\u304c\u3001\u9001\u3063\u305f\u30e1\u30fc\u30eb\u304c\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u6642\u3001\u82f1\u8a9e\u3060\u3089\u3051\u306e\u81ea\u52d5\u8fd4\u4fe1\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u3063\u305f\u7d4c\u9a13\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f\uff08Benchmark Email\u306a\u3069\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u3053\u306e\u69d8\u306a\u30e1\u30fc\u30eb\u306f\u5c4a\u304b\u305a\u3001\u30c4\u30fc\u30eb\u5185\u30ec\u30dd\u30fc\u30c8\u306b\u306b\u3066\u300c\u30bd\u30d5\u30c8\u30a8\u30e9\u30fc\u300d\u300c\u30cf\u30fc\u30c9\u30a8\u30e9\u30fc\u300d\u3068\u3044\u3046\u5f62\u3067\u30a8\u30e9\u30fc\u3068\u3042\u3063\u305f\u30a2\u30c9\u30ec\u30b9\u306e\u4e00\u89a7\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\uff09<\/p>\n<p>\u5b9f\u306f\u3053\u306e\u30e1\u30fc\u30eb\u306b\u306f\u306a\u305c\u30a8\u30e9\u30fc\u3060\u3063\u305f\u306e\u304b\u3001\u7406\u7531\u304c\u308f\u304b\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3068\u547c\u3070\u308c\u308b\u6570\u5b57\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306e\u30d6\u30ed\u30b0\u3067\u306f\u4ee3\u8868\u7684\u306a\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u4e00\u89a7\u3067\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n<a href=\"https:\/\/app.benchmarkemail.io\/register?language=ja&amp;region=ap-northeast-1\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-36721 size-full\" src=\"https:\/\/www.benchmarkemail.com\/images\/blog\/blog_trial_banner_general.png\" alt=\"\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0,\u30e1\u30eb\u30de\u30ac\u30b5\u30fc\u30d3\u30b9\u306e\u7121\u6599\u767b\u9332\" width=\"900\" height=\"340\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/#%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%B3%E3%83%BC%E3%83%89%E3%81%AE%E8%AA%AD%E3%81%BF%E6%96%B9\" >\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306e\u8aad\u307f\u65b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/#4xx%EF%BC%9A%E4%B8%80%E6%99%82%E7%9A%84%E3%81%AA%E3%82%A8%E3%83%A9%E3%83%BC\" >4xx\uff1a\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/#5xx%EF%BC%9A%E6%B0%B8%E7%B6%9A%E7%9A%84%E3%81%AA%E3%82%A8%E3%83%A9%E3%83%BC\" >5xx\uff1a\u6c38\u7d9a\u7684\u306a\u30a8\u30e9\u30fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/#%E3%82%A8%E3%83%A9%E3%83%BC%E9%85%8D%E4%BF%A1%E3%82%92%E7%B9%B0%E3%82%8A%E8%BF%94%E3%81%99%E3%81%93%E3%81%A8%E3%81%A7%E3%80%81%E3%81%95%E3%82%89%E3%81%AA%E3%82%8B%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%92%E5%BC%95%E3%81%8D%E8%B5%B7%E3%81%93%E3%81%99\" >\u30a8\u30e9\u30fc\u914d\u4fe1\u3092\u7e70\u308a\u8fd4\u3059\u3053\u3068\u3067\u3001\u3055\u3089\u306a\u308b\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3059<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/#%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\" >\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%B3%E3%83%BC%E3%83%89%E3%81%AE%E8%AA%AD%E3%81%BF%E6%96%B9\"><\/span>\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306e\u8aad\u307f\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-36210 size-full\" src=\"https:\/\/www.benchmarkemail.com\/jp\/wp-content\/uploads\/sites\/10\/2021\/01\/egNL6sdKl9XxQj41623825092_1623825100.webp\" alt=\"\" width=\"1002\" height=\"576\" srcset=\"https:\/\/www.benchmarkemail.com\/jp\/wp-content\/uploads\/sites\/10\/2021\/01\/egNL6sdKl9XxQj41623825092_1623825100.webp 1002w, https:\/\/www.benchmarkemail.com\/jp\/wp-content\/uploads\/sites\/10\/2021\/01\/egNL6sdKl9XxQj41623825092_1623825100-300x172.webp 300w, https:\/\/www.benchmarkemail.com\/jp\/wp-content\/uploads\/sites\/10\/2021\/01\/egNL6sdKl9XxQj41623825092_1623825100-768x441.webp 768w\" sizes=\"auto, (max-width: 1002px) 100vw, 1002px\" \/><\/p>\n<p>\u3053\u3061\u3089\u306f\u79c1\u304c\u5b9f\u969b\u306b\u53d7\u4fe1\u3057\u305f\u30a8\u30e9\u30fc\u8fd4\u4fe1\u30e1\u30fc\u30eb\u306e\u753b\u50cf\u3067\u3059\u3002\u3053\u3053\u3067\u6ce8\u76ee\u3057\u305f\u3044\u306e\u304c\u7dd1\u8272\u3067\u56f2\u3063\u305f\u90e8\u5206\u3002SMTP Status Code\u3068\u547c\u3070\u308c\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3067\u300cxxx x.x.x\u300d\u3068\u3044\u3046\u5de6\u5074\uff08\u3053\u306e\u5834\u5408\u306f550\uff09\u306e3\u30b1\u30bf\u306e\u6570\u5b57\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u306e\u8ee2\u9001\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3001\u3053\u3053\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u30a8\u30e9\u30fc\u3068\u306a\u3063\u305f\u7406\u7531\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u753b\u50cf\u306e\u4f8b\u3092\u5143\u306b\u3059\u308b\u3068\u3001\u300c550 5.1.1\u3000The email account that you tried to reach does not exist&#8230;..\u300d\u306f\uff13\u3064\u306e\u30d1\u30fc\u30c4\u306b\u5206\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u2460 550\u3000\u2192\u5fdc\u7b54\u30b3\u30fc\u30c9<\/strong><\/p>\n<p>3\u6841\u306e\u6570\u5b57\u304b\u3089\u306a\u308b\u30b3\u30fc\u30c9\u3067\u901a\u5e384\u304b5\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u305d\u308c\u305e\u308c\u3001<b>4\u304b\u3089\u59cb\u307e\u308b\u3082\u306e\u306f\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc\u7406\u7531\u30015\u304b\u3089\u59cb\u307e\u308b\u3082\u306e\u306f\u6c38\u7d9a\u7684\u306a\u7406\u7531\u306b\u3088\u308b\u30a8\u30e9\u30fc\u3068\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/b><\/p>\n<p><strong>\u2461 5.1.1\u3000\u2192\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9<\/strong><\/p>\n<p>\u3053\u3061\u3089\u306f\u5fdc\u7b54\u30b3\u30fc\u30c9\u306b\u5408\u308f\u305b\u8ffd\u52a0\u306e\u60c5\u5831\u304c\u8a18\u8f09\u3055\u308c\u308b\u7b87\u6240\u3067\u3059\u3002<\/p>\n<p><strong>\u2462 The email account that you tried to reach does not exist&#8230;..\u3000\u2192\u30c6\u30ad\u30b9\u30c8<\/strong><\/p>\n<p>\u5fdc\u7b54\u30b3\u30fc\u30c9\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u5224\u65ad\u3055\u308c\u308b\u3082\u306e\u306b\u5bfe\u3057\u3001\u3053\u3061\u3089\u306f\u4eba\u9593\u304c\u5224\u65ad\u3067\u304d\u308b\u69d8\u30c6\u30ad\u30b9\u30c8\u3067\u7406\u7531\u3092\u8a18\u8f09\u3057\u3066\u3044\u308b\u7b87\u6240\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u300c550 5.1.1\u3000The email account that you tried to reach does not exist&#8230;..\u300d\u306f\u9001\u4fe1\u5148\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u3068\u3044\u3046\u3001\u6c38\u7d9a\u7684\u306a\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306a\u30a8\u30e9\u30fc\u7406\u7531\u306f\u5fdc\u7b54\u30b3\u30fc\u30c9\u3068\u30c6\u30ad\u30b9\u30c8\u6587\u5b57\u3092\u8aad\u3080\u3053\u3068\u3067\u5224\u660e\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u3067\u306f\u3053\u3053\u304b\u3089\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2><span class=\"ez-toc-section\" id=\"4xx%EF%BC%9A%E4%B8%80%E6%99%82%E7%9A%84%E3%81%AA%E3%82%A8%E3%83%A9%E3%83%BC\"><\/span>4xx\uff1a\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc\u306e\u305f\u3081\u3001\u5f8c\u3067\u30e1\u30fc\u30eb\u914d\u4fe1\u3092\u518d\u5ea6\u8a66\u3057\u3066\u307f\u3066\u9001\u4fe1\u304c\u3067\u304d\u308b\u3053\u3068\u304c\u3042\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<table border=\"2px\" cellpadding=\"5px\">\n<tbody>\n<tr bgcolor=\"#dcdcdc\">\n<th>\u30b3\u30fc\u30c9<\/th>\n<th>\u30c6\u30ad\u30b9\u30c8<\/th>\n<th>\u30a8\u30e9\u30fc\u7406\u7531<\/th>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>421,\u201d4.4.5\u201d<\/td>\n<td>Server busy, try again later.<\/td>\n<td>\u9001\u4fe1\u5148\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u30d3\u30b8\u30fc\u72b6\u614b\u3067\u3042\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>421,\u201d4.7.0\u201d<\/td>\n<td>IP not in whitelist for RCPT domain, closing connection.<\/td>\n<td>\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u304c\u53d7\u4fe1\u5074\u306e\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306b\u5165\u3063\u3066\u3044\u306a\u3044\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>421,\u201d4.7.0\u201d<\/td>\n<td>\u201cOur system has detected an unusual rate of unsolicited mail originating from your IP address.<br \/>\nTo protect our users from spam, mail sent from your IP address has been temporarily blocked.\u201d<\/td>\n<td>\u9001\u4fe1\u5143\u3068\u306a\u3063\u3066\u3044\u308bIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u5927\u91cf\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u9001\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u4e00\u6642\u7684\u306b\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>421,\u201d4.7.0\u201d<\/td>\n<td>Temporary System Problem. Try again later<\/td>\n<td>\u30b7\u30b9\u30c6\u30e0\u306e\u4e00\u6642\u7684\u306a\u554f\u984c\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>421,\u201d4.7.0\u201d<\/td>\n<td>TLS required for RCPT domain, closing connection.<\/td>\n<td>\u53d7\u4fe1\u5074\u306b\u3066TLS\uff08\u30e1\u30fc\u30eb\u306e\u6697\u53f7\u5316\uff09\u306e\u8981\u6c42\u304c\u306a\u3055\u308c\u305f\uff08\u6697\u53f7\u5316\u304c\u3055\u308c\u3066\u3044\u306a\u3044\uff09\u3002<\/td>\n<\/tr>\n<tr>\n<td>450,\u201c4.1.1\u201d<\/td>\n<td>Recipient address rejected. unverified address:<\/td>\n<td>\u53d7\u4fe1\u30a2\u30c9\u30ec\u30b9\u8a8d\u8a3c\u306e\u306a\u3044\u30a2\u30c9\u30ec\u30b9\u3067\u3042\u308b\u305f\u3081\u62d2\u5426\u3055\u308c\u305f\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>450,\u201d4.2.1\u201d<\/td>\n<td>\u201cThe user you are trying to contact is receiving mail too quickly.<br \/>\nPlease resend your message at a later time.<br \/>\nIf the user is able to receive mail at that time, your message will be delivered.\u201d<\/td>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u304b\u304b\u3063\u305f\u6642\u9593\u304c\u77ed\u3059\u304e\u308b\u3002\uff08\u30e1\u30fc\u30eb\u306f\u4e00\u5b9a\u6642\u9593\u5185\u306b\u53d7\u4fe1\u53ef\u80fd\u306a\u901a\u6570\u5236\u9650\u3092\u8a2d\u3051\u3066\u304a\u308a\u3001\u305d\u308c\u3092\u4e0a\u56de\u308b\u91cf\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u884c\u308f\u308c\u305f\u969b\u306b\u30e1\u30fc\u30eb\u53d7\u4fe1\u304c\u62d2\u5426\u3055\u308c\u305f\u308a\u3057\u307e\u3059\u3002\u305d\u308c\u3092\u9632\u3050\u305f\u3081\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u304b\u304b\u308b\u6642\u9593\u3092\u3042\u3048\u3066\u9045\u304f\u3059\u308b\u3053\u3068\u3092\u300c\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0\u300d\u3068\u547c\u3073\u3001\u3053\u308c\u306b\u3088\u3063\u3066\u5b89\u5b9a\u7684\u306a\u30e1\u30fc\u30eb\u914d\u4fe1\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\uff09<\/td>\n<\/tr>\n<tr>\n<td>451,\u201d4.3.0\u201d<\/td>\n<td>Mail server temporarily rejected message.<\/td>\n<td>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067\u4e00\u6642\u7684\u306b\u62d2\u5426\u3055\u308c\u305f\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>451,\u201d4.4.2\u201d<\/td>\n<td>Timeout \u2013 closing connection.<\/td>\n<td>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8<\/td>\n<\/tr>\n<tr>\n<td>452,\u201d4.2.2\u201d<\/td>\n<td>The email account that you tried to reach is over quota.<\/td>\n<td>\u9001\u4fe1\u5148\u306e\u30a2\u30ab\u30a6\u30f3\u30c8\u5bb9\u91cf\u304c\u30aa\u30fc\u30d0\u30fc\u3057\u3066\u3044\u308b\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u95a2\u9023\u8a18\u4e8b\uff1a<br \/>\n<span style=\"color: #800000\"><a style=\"color: #800000\" href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/gmail_security_tls_and_dmarc\/\" target=\"_blank\" rel=\"noopener noreferrer\">Gmail\u306e\u6697\u53f7\u5316\u8a2d\u5b9a\u306b\u3088\u308a\u30e1\u30fc\u30eb\u306b\u5bfe\u3059\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fc\u610f\u8b58\u304c\u5411\u4e0a\u3002\u30fc\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fc\u306b\u307e\u3064\u308f\u308bTLS\u3001DMARC\u3063\u3066\u4f55\uff1f<\/a><\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"5xx%EF%BC%9A%E6%B0%B8%E7%B6%9A%E7%9A%84%E3%81%AA%E3%82%A8%E3%83%A9%E3%83%BC\"><\/span>5xx\uff1a\u6c38\u7d9a\u7684\u306a\u30a8\u30e9\u30fc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5bb9\u91cf\u304c\u3044\u3063\u3071\u3044\u306b\u306a\u3063\u3066\u3044\u305f\u308a\u3001\u30a2\u30c9\u30ec\u30b9\u304c\u4f7f\u308f\u308c\u3066\u3044\u306a\u3044\u306a\u3069\u3001\u4f55\u3089\u304b\u306e\u5bfe\u5fdc\u3092\u3057\u306a\u3044\u9650\u308a\u89e3\u6c7a\u3067\u304d\u306a\u3044\u30a8\u30e9\u30fc\u3002<\/p>\n<table border=\"2px\" cellpadding=\"5px\">\n<tbody>\n<tr bgcolor=\"#dcdcdc\">\n<th>\u30b3\u30fc\u30c9<\/th>\n<th>\u30c6\u30ad\u30b9\u30c8<\/th>\n<th>\u30a8\u30e9\u30fc\u7406\u7531<\/th>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>501,\u201d5.5.2\u201d<\/td>\n<td>Cannot Decode Response.<\/td>\n<td>\u5fdc\u7b54\u3092\u89e3\u8aad\u3067\u304d\u306a\u3044\u3002<\/td>\n<\/tr>\n<tr>\n<td>502,\u201d5.5.1<\/td>\n<td>\u201dUnimplemented command.<\/td>\n<td>\u30b3\u30de\u30f3\u30c9\u304c\u5b9f\u884c\u3055\u308c\u306a\u304b\u3063\u305f\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>530,\u201d5.7.0\u201d<\/td>\n<td>Must issue a STARTTLS command first.<\/td>\n<td>\u30e1\u30fc\u30eb\u306e\u6697\u53f7\u5316\uff08STARTTLS\uff09\u304c\u5fc5\u8981\u3002<\/td>\n<\/tr>\n<tr>\n<td>550,\u201d5.2.1\u201d<\/td>\n<td>The email account that you tried to reach is disabled.<\/td>\n<td>\u9001\u4fe1\u5148\u306e\u30e1\u30fc\u30eb\u30a2\u30ab\u30a6\u30f3\u30c8\u304c\u7121\u52b9\u3067\u3042\u308b\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>550,\u201d5.7.0\u201d<\/td>\n<td>Mail relay denied.<\/td>\n<td>\u30e1\u30fc\u30eb\u30ea\u30ec\u30fc\u304c\u62d2\u5426\u3055\u308c\u305f\u3002<\/td>\n<\/tr>\n<tr>\n<td>550,\u201d5.7.1\u201d<\/td>\n<td>Email quota exceeded.<\/td>\n<td>\u30e1\u30fc\u30eb\u5bb9\u91cf\u304c\u8d85\u904e\u3057\u3066\u3044\u308b\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>550,\u201d5.7.1\u201d<\/td>\n<td>Unauthenticated email is not accepted from this domain.<\/td>\n<td>\u3053\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u8a8d\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u308c\u306a\u3044\u3002<\/td>\n<\/tr>\n<tr>\n<td>552,\u201d5.2.2\u201d<\/td>\n<td>The email account that you tried to reach is over quota.<\/td>\n<td>\u9001\u4fe1\u5148\u306e\u30e1\u30fc\u30eb\u30a2\u30ab\u30a6\u30f3\u30c8\u306e\u5bb9\u91cf\u304c\u3044\u3063\u3071\u3044\u3067\u65b0\u305f\u306b\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3067\u304d\u306a\u3044\u3002<\/td>\n<\/tr>\n<tr bgcolor=\"#f5f5f5\">\n<td>553,\u201d5.1.2\u201d<\/td>\n<td>We weren\u2019t able to find the recipient domain.<\/td>\n<td>\u9001\u4fe1\u5148\u3068\u306a\u308b\u30a2\u30c9\u30ec\u30b9\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E3%82%A8%E3%83%A9%E3%83%BC%E9%85%8D%E4%BF%A1%E3%82%92%E7%B9%B0%E3%82%8A%E8%BF%94%E3%81%99%E3%81%93%E3%81%A8%E3%81%A7%E3%80%81%E3%81%95%E3%82%89%E3%81%AA%E3%82%8B%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%92%E5%BC%95%E3%81%8D%E8%B5%B7%E3%81%93%E3%81%99\"><\/span>\u30a8\u30e9\u30fc\u914d\u4fe1\u3092\u7e70\u308a\u8fd4\u3059\u3053\u3068\u3067\u3001\u3055\u3089\u306a\u308b\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3059<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u30e1\u30fc\u30eb\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3044\u3066\u305d\u306e\u52b9\u679c\u3092\u5de6\u53f3\u3059\u308b\u306e\u304c\u300c\u914d\u4fe1\u30ea\u30b9\u30c8\u306e\u8cea\u300d\u3067\u3059\u3002\u30a8\u30e9\u30fc\u914d\u4fe1\u3092\u7e70\u308a\u8fd4\u3057\u884c\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3067\u3001\u9001\u4fe1\u5143\u306e\u30a2\u30c9\u30ec\u30b9\uff08\u307e\u305f\u306f\u30c9\u30e1\u30a4\u30f3\uff09\u306e\u8a55\u4fa1\u304c\u4e0b\u304c\u308a\u30b9\u30d1\u30de\u30fc\u3084\u8ff7\u60d1\u30e1\u30fc\u30eb\u9001\u4fe1\u8005\u3068\u8a8d\u8b58\u3055\u308c\u3066\u3057\u307e\u3046\u69d8\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3046\u306a\u3063\u3066\u3057\u307e\u3046\u3068\u3001\u30e1\u30fc\u30eb\u306e\u5230\u9054\u7387\u304c\u4f4e\u4e0b\u3057\u3001\u672c\u6765\u306a\u3089\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3067\u304d\u308b\u9001\u4fe1\u5148\u306b\u3082\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br \/>\n\uff08\u4e00\u5ea6\u4e0b\u304c\u3063\u305f\u8a55\u4fa1\u3092\u518d\u5ea6\u5143\u306b\u623b\u3059\u306b\u306f\u30a8\u30e9\u30fc\u306e\u306a\u3044\u914d\u4fe1\u3092\u534a\u5e74\u304b\u30891\u5e74\u7d9a\u3051\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u8a00\u308f\u308c\u3066\u3044\u307e\u3059\u3002\uff09<\/p>\n<p>Benchmark Email\u3067\u306f\u30a8\u30e9\u30fc\u914d\u4fe1\u3092\u5c11\u306a\u304f\u3055\u305b\u308b\u305f\u3081\u306b\u3001\u914d\u4fe1\u524d\u306b\u30a8\u30e9\u30fc\u30a2\u30c9\u30ec\u30b9\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30c4\u30fc\u30eb\u306e\u63d0\u4f9b\u3084\u904e\u53bb\u306b\u30a8\u30e9\u30fc\u3068\u306a\u3063\u305f\u30a2\u30c9\u30ec\u30b9\u306e\u7ba1\u7406\u65b9\u6cd5\u3092\u30d6\u30ed\u30b0\u3067\u3054\u7d39\u4ecb\u3059\u308b\u306a\u3069\u3001\u5229\u7528\u3055\u308c\u308b\u65b9\u306e\u30e1\u30fc\u30eb\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306e\u52b9\u679c\u3092\u6700\u5927\u9650\u9ad8\u3081\u308b\u305f\u3081\u306e\u30b5\u30dd\u30fc\u30c8\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u95a2\u9023\u8a18\u4e8b\uff1a<br \/>\n<a href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/blogsimprove_your_deliverability_with_good_list\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #800000\">\u30e1\u30eb\u30de\u30ac\u306e\u5230\u9054\u7387\u3092\u9ad8\u304f\u7dad\u6301\u3059\u308b\u305f\u3081\u306e\u6b63\u3057\u3044\u904b\u7528\u65b9\u6cd5<\/span><br \/>\n<\/a><a href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/kickbox-to-identify-error-addresses\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #800000\">Kickbox\u3092\u4f7f\u3063\u3066\u914d\u4fe1\u524d\u306b\u4f7f\u3048\u306a\u3044\u30a2\u30c9\u30ec\u30b9\u3092\u7c21\u5358\u306b\u30c1\u30a7\u30c3\u30af<\/span><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\"><\/span>\u3055\u3044\u3054\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5229\u7528\u3057\u3066\u3044\u308b\u30e1\u30fc\u30e9\u30fc\u306b\u3088\u3063\u3066\u8868\u8a18\u306a\u3069\u3082\u7570\u306a\u308b\u3053\u3068\u3082\u3042\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u3053\u3061\u3089\u306e\u30d6\u30ed\u30b0\u3067\u306f\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u30a8\u30e9\u30fc\u5185\u5bb9\u3092\u77e5\u308b\u3053\u3068\u3067\u4eca\u5f8c\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u3078\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u5bfe\u5fdc\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3046\u3084\u3063\u3066\u6301\u3063\u3066\u3044\u308b\u914d\u4fe1\u30ea\u30b9\u30c8\u306e\u8cea\u3092\u9ad8\u3081\u308b\u3053\u3068\u3067\u30e1\u30fc\u30eb\u65bd\u7b56\u306e\u52b9\u679c\u3092\u9ad8\u3081\u3066\u3044\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p>\u53c2\u8003\u8cc7\u6599\uff1a<br \/>\n<span style=\"color: #800000\"><a class=\"external\" style=\"color: #800000\" href=\"https:\/\/support.google.com\/a\/answer\/3221692?hl=ja\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">SMTP \u30a8\u30e9\u30fc \u30e1\u30c3\u30bb\u30fc\u30b8<br \/>\n<\/a><a class=\"external\" style=\"color: #800000\" href=\"https:\/\/support.google.com\/a\/answer\/3726730?hl=ja\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">SMTP \u30a8\u30e9\u30fc \u30ea\u30d5\u30a1\u30ec\u30f3\u30b9<\/a><\/span><\/p>\n<p><a href=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/newslettersurvey2022\/\" target=\"_blank\" rel=\"noopener\">\u30fb\u30e1\u30eb\u30de\u30ac\u8cfc\u8aad\u72b6\u6cc1\u8abf\u67fb2002\u5e74\u5ea6\u7248<\/a><\/p>\n<div>*\u672c\u8a18\u4e8b\u306f\u30012017\u5e745\u6708\u306b\u516c\u958b\u3057\u305f\u8a18\u4e8b\u3092\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/div>\n<p><a href=\"https:\/\/app.benchmarkemail.io\/register?language=ja&amp;region=ap-northeast-1\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-36721 size-full\" src=\"https:\/\/www.benchmarkemail.com\/images\/blog\/blog_trial_banner_general.png\" alt=\"\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0,\u30e1\u30eb\u30de\u30ac\u30b5\u30fc\u30d3\u30b9\u306e\u7121\u6599\u767b\u9332\" width=\"900\" height=\"340\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7a81\u7136\u3067\u3059\u304c\u3001\u9001\u3063\u305f\u30e1\u30fc\u30eb\u304c\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u6642\u3001\u82f1\u8a9e\u3060\u3089\u3051\u306e\u81ea\u52d5\u8fd4\u4fe1\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u3063\u305f\u7d4c\u9a13\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f\uff08Benchmark Email\u306a\u3069\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u3053\u306e\u69d8\u306a\u30e1\u30fc\u30eb\u306f\u5c4a\u304b\u305a\u3001\u30c4\u30fc\u30eb\u5185\u30ec\u30dd\u30fc\u30c8\u306b\u306b\u3066\u300c\u30bd\u30d5\u30c8\u30a8\u30e9\u30fc\u300d\u300c\u30cf\u30fc\u30c9\u30a8\u30e9\u30fc\u300d\u3068\u3044\u3046\u5f62\u3067\u30a8\u30e9\u30fc\u3068\u3042\u3063\u305f\u30a2\u30c9\u30ec\u30b9\u306e\u4e00\u89a7\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\uff09 \u5b9f\u306f\u3053\u306e\u30e1\u30fc\u30eb\u306b\u306f\u306a\u305c\u30a8\u30e9\u30fc\u3060\u3063\u305f\u306e\u304b\u3001\u7406\u7531\u304c\u308f\u304b\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3068\u547c\u3070\u308c\u308b\u6570\u5b57\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306e\u30d6\u30ed\u30b0\u3067\u306f\u4ee3\u8868\u7684\u306a\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u4e00\u89a7\u3067\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002 \u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306e\u8aad\u307f\u65b9 \u3053\u3061\u3089\u306f\u79c1\u304c\u5b9f\u969b\u306b\u53d7\u4fe1\u3057\u305f\u30a8\u30e9\u30fc\u8fd4\u4fe1\u30e1\u30fc\u30eb\u306e\u753b\u50cf\u3067\u3059\u3002\u3053\u3053\u3067\u6ce8\u76ee\u3057\u305f\u3044\u306e\u304c\u7dd1\u8272\u3067\u56f2\u3063\u305f\u90e8\u5206\u3002SMTP Status Code\u3068\u547c\u3070\u308c\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3067\u300cxxx x.x.x\u300d\u3068\u3044\u3046\u5de6\u5074\uff08\u3053\u306e\u5834\u5408\u306f550\uff09\u306e3\u30b1\u30bf\u306e\u6570\u5b57\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u306e\u8ee2\u9001\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3001\u3053\u3053\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u30a8\u30e9\u30fc\u3068\u306a\u3063\u305f\u7406\u7531\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u753b\u50cf\u306e\u4f8b\u3092\u5143\u306b\u3059\u308b\u3068\u3001\u300c550 5.1.1\u3000The email account that you tried to reach does not exist&#8230;..\u300d\u306f\uff13\u3064\u306e\u30d1\u30fc\u30c4\u306b\u5206\u3051\u3089\u308c\u307e\u3059\u3002 \u2460 550\u3000\u2192\u5fdc\u7b54\u30b3\u30fc\u30c9 3\u6841\u306e\u6570\u5b57\u304b\u3089\u306a\u308b\u30b3\u30fc\u30c9\u3067\u901a\u5e384\u304b5\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u305d\u308c\u305e\u308c\u30014\u304b\u3089\u59cb\u307e\u308b\u3082\u306e\u306f\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc\u7406\u7531\u30015\u304b\u3089\u59cb\u307e\u308b\u3082\u306e\u306f\u6c38\u7d9a\u7684\u306a\u7406\u7531\u306b\u3088\u308b\u30a8\u30e9\u30fc\u3068\u5206\u985e\u3055\u308c\u307e\u3059\u3002 \u2461 5.1.1\u3000\u2192\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9 \u3053\u3061\u3089\u306f\u5fdc\u7b54\u30b3\u30fc\u30c9\u306b\u5408\u308f\u305b\u8ffd\u52a0\u306e\u60c5\u5831\u304c\u8a18\u8f09\u3055\u308c\u308b\u7b87\u6240\u3067\u3059\u3002 \u2462 The email account that you tried to reach does not exist&#8230;..\u3000\u2192\u30c6\u30ad\u30b9\u30c8 \u5fdc\u7b54\u30b3\u30fc\u30c9\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u5224\u65ad\u3055\u308c\u308b\u3082\u306e\u306b\u5bfe\u3057\u3001\u3053\u3061\u3089\u306f\u4eba\u9593\u304c\u5224\u65ad\u3067\u304d\u308b\u69d8\u30c6\u30ad\u30b9\u30c8\u3067\u7406\u7531\u3092\u8a18\u8f09\u3057\u3066\u3044\u308b\u7b87\u6240\u306b\u306a\u308a\u307e\u3059\u3002 \u3061\u306a\u307f\u306b\u300c550 5.1.1\u3000The email account that you tried to reach does not exist&#8230;..\u300d\u306f\u9001\u4fe1\u5148\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u3068\u3044\u3046\u3001\u6c38\u7d9a\u7684\u306a\u30a8\u30e9\u30fc\u3067\u3059\u3002 \u57fa\u672c\u7684\u306a\u30a8\u30e9\u30fc\u7406\u7531\u306f\u5fdc\u7b54\u30b3\u30fc\u30c9\u3068\u30c6\u30ad\u30b9\u30c8\u6587\u5b57\u3092\u8aad\u3080\u3053\u3068\u3067\u5224\u660e\u304c\u3067\u304d\u307e\u3059\u3002 \u3067\u306f\u3053\u3053\u304b\u3089\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002 4xx\uff1a\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc \u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc\u306e\u305f\u3081\u3001\u5f8c\u3067\u30e1\u30fc\u30eb\u914d\u4fe1\u3092\u518d\u5ea6\u8a66\u3057\u3066\u307f\u3066\u9001\u4fe1\u304c\u3067\u304d\u308b\u3053\u3068\u304c\u3042\u308b\u3082\u306e\u3067\u3059\u3002&hellip;<\/p>\n","protected":false},"author":44,"featured_media":40598,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[2298],"tags":[],"class_list":["post-11733","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-openrate"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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content=\"\u9001\u3063\u305f\u30e1\u30fc\u30eb\u304c\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u6642\u3001\u82f1\u8a9e\u3060\u3089\u3051\u306e\u81ea\u52d5\u8fd4\u4fe1\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u3063\u305f\u7d4c\u9a13\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f\u5b9f\u306f\u3053\u306e\u30e1\u30fc\u30eb\u306b\u306f\u306a\u305c\u30a8\u30e9\u30fc\u3060\u3063\u305f\u306e\u304b\u3001\u7406\u7531\u304c\u308f\u304b\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3068\u547c\u3070\u308c\u308b\u6570\u5b57\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306f\u4ee3\u8868\u7684\u306a\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u4e00\u89a7\u3067\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.benchmarkemail.com\/jp\/blog\/error-codes-of-bounced-emails\/\" \/>\n<meta property=\"og:site_name\" content=\"Benchmark Email \u65e5\u672c\u8a9e\u7248\" \/>\n<meta property=\"article:publisher\" 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