{"id":1308,"date":"2026-07-31T11:30:15","date_gmt":"2026-07-31T02:30:15","guid":{"rendered":"https:\/\/ec2-54-238-200-5.ap-northeast-1.compute.amazonaws.com\/blog\/?p=1308"},"modified":"2026-07-31T14:55:26","modified_gmt":"2026-07-31T05:55:26","slug":"smtp%e5%bf%9c%e7%ad%94%e3%82%b3%e3%83%bc%e3%83%89%e3%81%ae%e5%9f%ba%e7%a4%8e%e7%9f%a5%e8%ad%98","status":"publish","type":"post","link":"https:\/\/sendgrid.kke.co.jp\/blog\/?p=1308","title":{"rendered":"SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306e\u610f\u5473\u3068\u5bfe\u51e6\u65b9\u6cd5"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/07\/20260731_blog.png\" alt=\"SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306e\u610f\u5473\u3068\u5bfe\u51e6\u65b9\u6cd5\" width=\"100%\" class=\"aligncenter size-full wp-image-21096\" srcset=\"https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/07\/20260731_blog.png 1200w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/07\/20260731_blog-300x185.png 300w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/07\/20260731_blog-1024x630.png 1024w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/07\/20260731_blog-768x472.png 768w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/07\/20260731_blog-225x139.png 225w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<blockquote>\n<p>\u3053\u306e\u8a18\u4e8b\u306f <a href=\"https:\/\/www.twilio.com\/en-us\/blog\/insights\/smtp-server-response-codes-explained\" target=\"_blank\">SMTP Error Codes: What Do These Server Responses Mean?<\/a> \u306e\u6284\u8a33\u3067\u3059\u3002<\/p>\n<\/blockquote>\n<p>\u30e1\u30fc\u30eb\u306f\u3042\u308b\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u304b\u3089\u5225\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3078\u3068<a href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=11638\" rel=\"noopener\" target=\"_blank\">SMTP\u30b5\u30fc\u30d0<\/a>\uff08\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\uff09\u3092\u7d4c\u7531\u3057\u3066\u30ea\u30ec\u30fc\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u969bSMTP\u30b5\u30fc\u30d0\u306f\u3001\u300cSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u300d\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u3068\u306f\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u304c\u9001\u4fe1\u3059\u308b3\u6841\u306e\u5fdc\u7b54\u30b3\u30fc\u30c9\u3067\u3001\u30e1\u30fc\u30eb\u304c\u6b63\u5e38\u306b\u914d\u4fe1\u3055\u308c\u305f\u304b\u3001\u4e00\u6642\u7684\u306a\u9045\u5ef6\u304c\u767a\u751f\u3057\u305f\u304b\u3001\u3042\u308b\u3044\u306f\u6052\u4e45\u7684\u306b\u62d2\u5426\u3055\u308c\u305f\u304b\u306a\u3069\u306e\u9001\u4fe1\u7d50\u679c\u3092\u793a\u3059\u60c5\u5831\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u3067\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u969b\u306e\u539f\u56e0\u3084\u5bfe\u51e6\u65b9\u6cd5\u306e\u5224\u65ad\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p>SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306f\u4e3b\u306b\u4ee5\u4e0b\u306e4\u3064\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>2xx\uff1a\u6210\u529f\uff08\u30e1\u30fc\u30eb\u304c\u30b5\u30fc\u30d0\u306b\u53d7\u3051\u4ed8\u3051\u3089\u308c\u307e\u3057\u305f\uff09<\/li>\n<li>3xx\uff1a\u8ffd\u52a0\u306e\u5165\u529b\u5f85\u3061\uff08\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u8ffd\u52a0\u60c5\u5831\u306e\u9001\u4fe1\u304c\u5fc5\u8981\u3067\u3059\uff09<\/li>\n<li>4xx\uff1a\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc\uff08\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3059\u308b\u3068\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\uff09<\/li>\n<li>5xx\uff1a\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc\uff08\u539f\u56e0\u306b\u5bfe\u51e6\u3057\u306a\u3044\u9650\u308a\u3001\u518d\u9001\u3057\u3066\u3082\u6210\u529f\u3057\u307e\u305b\u3093\uff09<\/li>\n<\/ul>\n<p>\u4eca\u56de\u306f\u3001\u4e3b\u306aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u3068\u3001\u305d\u306e\u539f\u56e0\u3084\u5bfe\u51e6\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u3068\u5bfe\u51e6\u65b9\u6cd5<\/h3>\n<p>\u305d\u308c\u3067\u306f\u4e3b\u306aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306e\u610f\u5473\u3068\u5bfe\u51e6\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u65e9\u898b\u8868<\/h4>\n<table>\n<tbody>\n<tr>\n<th width=\"15%\">\u30b3\u30fc\u30c9<\/th>\n<th width=\"15%\">\u5206\u985e<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u5bfe\u5fdc\u65b9\u6cd5<\/th>\n<\/tr>\n<tr>\n<td>211<\/td>\n<td>\u60c5\u5831<\/td>\n<td>\u30b7\u30b9\u30c6\u30e0\u30b9\u30c6\u30fc\u30bf\u30b9<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>214<\/td>\n<td>\u60c5\u5831<\/td>\n<td>\u30d8\u30eb\u30d7\u30e1\u30c3\u30bb\u30fc\u30b8<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>220<\/td>\n<td>\u6210\u529f<\/td>\n<td>\u30b5\u30fc\u30d3\u30b9\u6e96\u5099\u5b8c\u4e86<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>221<\/td>\n<td>\u6210\u529f<\/td>\n<td>\u63a5\u7d9a\u3092\u9589\u3058\u307e\u3059<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>250<\/td>\n<td>\u6210\u529f<\/td>\n<td>\u8981\u6c42\u3092\u53d7\u3051\u4ed8\u3051\u307e\u3057\u305f<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>251<\/td>\n<td>\u6210\u529f<\/td>\n<td>\u30e6\u30fc\u30b6\u306f\u3053\u306e\u30b5\u30fc\u30d0\u306b\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u8ee2\u9001\u3057\u307e\u3059<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>252<\/td>\n<td>\u6210\u529f<\/td>\n<td>\u30e6\u30fc\u30b6\u306e\u5b58\u5728\u306f\u78ba\u8a8d\u3067\u304d\u306a\u3044\u304c\u3001\u30e1\u30fc\u30eb\u306f\u53d7\u3051\u4ed8\u3051\u307e\u3059<\/td>\n<td>\u5bfe\u5fdc\u4e0d\u8981<\/td>\n<\/tr>\n<tr>\n<td>354<\/td>\n<td>\u8ffd\u52a0\u306e\u5165\u529b\u5f85\u3061<\/td>\n<td>\u30e1\u30c3\u30bb\u30fc\u30b8\u30c7\u30fc\u30bf\u306e\u5165\u529b\u3092\u958b\u59cb\u3057\u3066\u304f\u3060\u3055\u3044<\/td>\n<td>\u30e1\u30c3\u30bb\u30fc\u30b8\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>421<\/td>\n<td>\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3067\u304d\u307e\u305b\u3093<\/td>\n<td>\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>450<\/td>\n<td>\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u4e00\u6642\u7684\u306b\u5229\u7528\u3067\u304d\u307e\u305b\u3093<\/td>\n<td>\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>451<\/td>\n<td>\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u4e2d\u6b62\u3055\u308c\u307e\u3057\u305f<\/td>\n<td>\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>452<\/td>\n<td>\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30b7\u30b9\u30c6\u30e0\u306e\u7a7a\u304d\u5bb9\u91cf\u304c\u4e0d\u8db3\u3057\u3066\u3044\u307e\u3059<\/td>\n<td>\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>500<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u69cb\u6587\u30a8\u30e9\u30fc<\/td>\n<td>\u30b3\u30de\u30f3\u30c9\u3092\u4fee\u6b63\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>501<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u69cb\u6587\u30a8\u30e9\u30fc\u304c\u3042\u308a\u307e\u3059<\/td>\n<td>\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4fee\u6b63\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>502<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30b3\u30de\u30f3\u30c9\u306f\u5b9f\u88c5\u3055\u308c\u3066\u3044\u307e\u305b\u3093<\/td>\n<td>\u5225\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>503<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30b3\u30de\u30f3\u30c9\u306e\u9806\u5e8f\u304c\u6b63\u3057\u304f\u3042\u308a\u307e\u305b\u3093<\/td>\n<td>\u30b3\u30de\u30f3\u30c9\u306e\u9001\u4fe1\u9806\u3092\u4fee\u6b63\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>504<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u6307\u5b9a\u3057\u305f\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u305b\u3093<\/td>\n<td>\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4fee\u6b63\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>550<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u5229\u7528\u3067\u304d\u307e\u305b\u3093<\/td>\n<td>\u5b9b\u5148\u30a2\u30c9\u30ec\u30b9\u3092\u78ba\u8a8d\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>551<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30e6\u30fc\u30b6\u306f\u3053\u306e\u30b5\u30fc\u30d0\u306b\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u6b63\u3057\u3044\u5b9b\u5148\u3078\u9001\u4fe1\u3057\u3066\u304f\u3060\u3055\u3044<\/td>\n<td>\u6b63\u3057\u3044\u5b9b\u5148\u30b5\u30fc\u30d0\uff08\u5225\u306e\u5b9b\u5148\uff09\u306b\u9001\u4fe1\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>552<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30b9\u30c8\u30ec\u30fc\u30b8\u5bb9\u91cf\u3092\u8d85\u3048\u3066\u3044\u307e\u3059<\/td>\n<td>\u30e1\u30fc\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>553<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u7121\u52b9\u3067\u3059<\/td>\n<td>\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u4fee\u6b63\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>554<\/td>\n<td>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/td>\n<td>\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u51e6\u7406\u306b\u5931\u6557\u3057\u307e\u3057\u305f<\/td>\n<td>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u5185\u5bb9\u3092\u78ba\u8a8d\u3057\u3066\u5bfe\u51e6\u3059\u308b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5404\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u4ee5\u4e0b\u306b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h4>2xx\uff1a\u6210\u529f<\/h4>\n<p>2xx\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306f\u3001\u30b5\u30fc\u30d0\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u53d7\u3051\u4ed8\u3051\u3089\u308c\u305f\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<h5>211: System status<\/h5>\n<p>\u30b7\u30b9\u30c6\u30e0\u30b9\u30c6\u30fc\u30bf\u30b9\u3084\u30d8\u30eb\u30d7\u60c5\u5831\u3067\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304cHELP\u30b3\u30de\u30f3\u30c9\u3092\u9001\u4fe1\u3057\u305f\u969b\u306b\u8fd4\u3055\u308c\u308b\u3082\u306e\u3067\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u3068\u306f\u95a2\u4fc2\u3042\u308a\u307e\u305b\u3093\u3002\u30e1\u30fc\u30eb\u914d\u4fe1\u6642\u306b\u3053\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u3092\u898b\u304b\u3051\u308b\u3053\u3068\u306f\u7121\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h5>214: Help message<\/h5>\n<p>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306eHELP\u30b3\u30de\u30f3\u30c9\u306b\u5bfe\u3057\u3001\u30b5\u30fc\u30d0\u304c\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u30b3\u30de\u30f3\u30c9\u3084\u69cb\u6587\u30eb\u30fc\u30eb\u306a\u3069\u306e\u30d8\u30eb\u30d7\u60c5\u5831\u3092\u8fd4\u3057\u305f\u3082\u306e\u3067\u3059\u3002\u300c211: System status\u300d\u3068\u540c\u69d8\u306b\u3001\u60c5\u5831\u63d0\u4f9b\u304c\u76ee\u7684\u3067\u3042\u308a\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u3068\u306f\u95a2\u4fc2\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h5>220: Service ready<\/h5>\n<p>\u30b5\u30fc\u30d0\u304c\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u63a5\u7d9a\u3092\u53d7\u3051\u5165\u308c\u3001\u30b3\u30de\u30f3\u30c9\u3092\u53d7\u3051\u4ed8\u3051\u308b\u6e96\u5099\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u901a\u4fe1\u3092\u958b\u59cb\u3059\u308b\u969b\u306e\u6700\u521d\u306e\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\uff08\u6328\u62f6\uff09\u3067\u3059\u3002220\u304c\u8fd4\u3055\u308c\u306a\u3044\u5834\u5408\u306f\u3001\u30b5\u30fc\u30d0\u304c\u63a5\u7d9a\u3092\u53d7\u3051\u5165\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<h5>221: Service closing transmission channel<\/h5>\n<p>\u30e1\u30fc\u30eb\u9001\u4fe1\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u51e6\u7406\u306b\u6210\u529f\u3057\u305f\u5f8c\u3001\u30b5\u30fc\u30d0\u304c\u63a5\u7d9a\u3092\u9589\u3058\u308b\u969b\u306b\u8fd4\u3055\u308c\u307e\u3059\u3002SMTP\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u7d42\u4e86\u3059\u308b\u969b\u306e\u6328\u62f6\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n<h5>250: Requested mail action okay, completed<\/h5>\n<p>\u30e1\u30fc\u30eb\u304c\u30b5\u30fc\u30d0\u306b\u53d7\u3051\u5165\u308c\u3089\u308c\u3001\u914d\u4fe1\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u5f8c\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u304c\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30e1\u30fc\u30eb\u3092\u914d\u9001\u3057\u307e\u3059\u304c\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u5c4a\u304f\u4fdd\u8a3c\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u305f\u308a\u3001\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u30eb\u30fc\u30eb\u306b\u3088\u308a\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>250\u306e\u3088\u304f\u3042\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u4f8b<\/p>\n<ul>\n<li><strong>250 OK<\/strong>\uff1a\u4e00\u822c\u7684\u306a\u6210\u529f\u5fdc\u7b54<\/li>\n<li><strong>250 Message accepted for delivery<\/strong>\uff1a\u53d7\u4ed8\u5b8c\u4e86\u3092\u660e\u793a\u3059\u308b\u5fdc\u7b54<\/li>\n<li><strong>250 2.0.0 OK<\/strong>\uff1a\u300c\u62e1\u5f35\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\uff08\u3088\u308a\u8a73\u7d30\u306a\u60c5\u5831\u3092\u793a\u3059\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\uff09\u300d\u3092\u542b\u3080\u5fdc\u7b54<\/li>\n<\/ul>\n<h5>251: User not local; will forward<\/h5>\n<p>\u6307\u5b9a\u3055\u308c\u305f\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u304c\u3001\u8ee2\u9001\u30eb\u30fc\u30eb\u3084\u30e1\u30fc\u30eb\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306e\u4ed5\u7d44\u307f\u306b\u5f93\u3044\u3001\u30b5\u30fc\u30d0\u304c\u5225\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306b\u30e1\u30fc\u30eb\u3092\u8ee2\u9001\u3057\u307e\u3059\u3002<\/p>\n<h5>252: Cannot verify user, but will accept message<\/h5>\n<p>\u6307\u5b9a\u3055\u308c\u305f\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u30e1\u30fc\u30eb\u306f\u53d7\u3051\u4ed8\u3051\u307e\u3059\u3002\u3053\u308c\u306f\u3001DHA\uff08Directory Harvest Attack\uff1a\u6709\u52b9\u306a\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u53ce\u96c6\u3059\u308b\u653b\u6483\uff09\u3092\u9632\u3050\u305f\u3081\u306b\u3001VRFY\u30b3\u30de\u30f3\u30c9\u306a\u3069\u306b\u3088\u308b\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5b58\u5728\u78ba\u8a8d\u3092\u7981\u6b62\u3057\u3066\u3044\u308b\u30b5\u30fc\u30d0\u3067\u8fd4\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u5b58\u5728\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u3001\u5f8c\u304b\u3089\u30d0\u30a6\u30f3\u30b9\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h4>3xx\uff1a\u8ffd\u52a0\u306e\u5165\u529b\u5f85\u3061<\/h4>\n<h5>354: Start mail input; end with &lt;CRLF&gt;.&lt;CRLF&gt;<\/h5>\n<p>\u3053\u308c\u306f\u30a8\u30e9\u30fc\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\uff08MAIL FROM\uff09\u3068\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\uff08RCPT TO\uff09\u304c\u6307\u5b9a\u3055\u308c\u305f\u5f8c\u3001\u30e1\u30fc\u30eb\u672c\u6587\u304c\u9001\u3089\u308c\u3066\u304f\u308b\u306e\u3092\u30b5\u30fc\u30d0\u304c\u5f85\u3063\u3066\u3044\u308b\u72b6\u614b\u3067\u3059\u3002\u6b63\u5e38\u306aSMTP\u901a\u4fe1\u3067\u306f\u3001\u30e1\u30fc\u30eb\u672c\u6587\u306e\u9001\u4fe1\u524d\u306b\u5fc5\u305a\u3053\u306e\u5fdc\u7b54\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<h4>4xx\uff1a\u4e00\u6642\u7684\u306a\u30a8\u30e9\u30fc<\/h4>\n<p>\u4f55\u3089\u304b\u306e\u4e00\u6642\u7684\u306a\u539f\u56e0\u306b\u3088\u308a\u30e1\u30fc\u30eb\u306f\u53d7\u3051\u4ed8\u3051\u3089\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001\u518d\u9001\u3059\u308b\u3053\u3068\u3067\u5c4a\u304f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u591a\u304f\u306e\u9001\u4fe1\u30b5\u30fc\u30d0\u306f\u30014xx\u30a8\u30e9\u30fc\u304c\u8fd4\u3055\u308c\u305f\u30e1\u30fc\u30eb\u3092\u81ea\u52d5\u7684\u306b\u518d\u9001\u3057\u307e\u3059\u3002<\/p>\n<h5>421: Service not available, closing transmission channel<\/h5>\n<p>\u5b9b\u5148\u30b5\u30fc\u30d0\u306b\u3088\u308a\u3001\u4e00\u6642\u7684\u306b\u30e1\u30fc\u30eb\u306e\u53d7\u4fe1\u304c\u4fdd\u7559\u3055\u308c\u307e\u3057\u305f\u3002\u5358\u4f4d\u6642\u9593\u3042\u305f\u308a\u306e\u63a5\u7d9a\u6570\u3084\u9001\u4fe1\u6570\u304c\u591a\u3059\u304e\u308b\u5834\u5408\u3084\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u306e\u8ca0\u8377\u304c\u9ad8\u3044\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n15\u5206\u304b\u308930\u5206\u7a0b\u5ea6\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4e00\u6589\u9001\u4fe1\u30e1\u30fc\u30eb\u306e\u5834\u5408\u306f\u3001\u518d\u9001\u9593\u9694\u3092\u5f90\u3005\u306b\u9577\u304f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5>450: Requested mail action not taken: mailbox unavailable<\/h5>\n<p>\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u4e00\u6642\u7684\u306b\u5229\u7528\u3067\u304d\u306a\u304b\u3063\u305f\u305f\u3081\u3001\u30e1\u30fc\u30eb\u3092\u914d\u4fe1\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306b\u3088\u3063\u3066\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3084\u3001\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u91cf\u3092\u8d85\u904e\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3042\u308b\u3044\u306f\u6280\u8853\u7684\u306a\u554f\u984c\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u5834\u5408\u306a\u3069\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n2\uff5e3\u6642\u9593\u5f8c\u306b\u518d\u9001\u3057\u307e\u3057\u3087\u3046\u300224\u6642\u9593\u7d4c\u3063\u3066\u3082\u89e3\u6d88\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u5225\u306e\u9023\u7d61\u624b\u6bb5\u3092\u4f7f\u3063\u3066\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u3066\u3044\u308b\u304b\u3092\u53d7\u4fe1\u8005\u306b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h5>451: Requested action aborted: local error in processing<\/h5>\n<p>\u5b9b\u5148\u30b5\u30fc\u30d0\u3067\u4f55\u3089\u304b\u306e\u4e00\u6642\u7684\u306a\u554f\u984c\u304c\u767a\u751f\u3057\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u306b\u5931\u6557\u3057\u305f\u3053\u3068\u3092\u793a\u3059\u6c4e\u7528\u7684\u306a\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u901a\u5e38\u3001\u3053\u306e\u30a8\u30e9\u30fc\u306f\u81ea\u7136\u306b\u89e3\u6d88\u3057\u307e\u3059\u3002\u6570\u65e5\u9593\u7d4c\u3063\u3066\u3082\u89e3\u6d88\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u306e\u7ba1\u7406\u8005\u306b\u8abf\u67fb\u3092\u4f9d\u983c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h5>452: Requested action not taken: insufficient system storage<\/h5>\n<p>\u5b9b\u5148\u30b5\u30fc\u30d0\u306e\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u3084\u30b7\u30b9\u30c6\u30e0\u30ea\u30bd\u30fc\u30b9\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30e1\u30fc\u30eb\u306f\u53d7\u3051\u53d6\u3089\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308b\u3053\u3068\u3082\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002\u7279\u5b9a\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u3053\u306e\u554f\u984c\u304c\u983b\u767a\u3059\u308b\u5834\u5408\u306f\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u306e\u7ba1\u7406\u8005\u306b\u9023\u7d61\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b9\u30c8\u30ec\u30fc\u30b8\u5bb9\u91cf\u306e\u89e3\u653e\u306f\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u306e\u7ba1\u7406\u8005\u304c\u5b9f\u65bd\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h4>5xx\uff1a\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc<\/h4>\n<p>\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3001\u539f\u56e0\u3092\u89e3\u6d88\u3057\u306a\u3044\u9650\u308a\u3001\u518d\u9001\u3057\u3066\u3082\u30e1\u30fc\u30eb\u306f\u5c4a\u304d\u307e\u305b\u3093\u3002\u539f\u56e0\u306b\u5bfe\u51e6\u3057\u305f\u5f8c\u3067\u518d\u9001\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5>500: Syntax error, command unrecognized<\/h5>\n<p>\u9001\u4fe1\u3057\u305fSMTP\u30b3\u30de\u30f3\u30c9\u3092\u63a5\u7d9a\u5148\u306e\u30b5\u30fc\u30d0\u304c\u7406\u89e3\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084\u30e1\u30fc\u30eb\u9001\u4fe1\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u304c\u8aa4\u3063\u305f\u69cb\u6587\u3092\u9001\u4fe1\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u539f\u56e0\u3067\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8a2d\u5b9a\u3092\u898b\u76f4\u3057\u3001\u9069\u5207\u306aSMTP\u30b3\u30de\u30f3\u30c9\u3068\u69cb\u6587\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002\u305f\u3060\u3057\u3001\u901a\u5e38\u306f\u8a2d\u5b9a\u306e\u554f\u984c\u3067\u306f\u306a\u304f\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306e\u4e0d\u5177\u5408\u306b\u8d77\u56e0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h5>501: Syntax error in parameters or arguments<\/h5>\n<p>SMTP\u30b3\u30de\u30f3\u30c9\u306f\u8a8d\u8b58\u3055\u308c\u307e\u3057\u305f\u304c\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5f62\u5f0f\u304c\u8aa4\u3063\u3066\u3044\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5f62\u5f0f\u304c\u4e0d\u6b63\u306a\u5834\u5408\u3084\u3001\u30b3\u30de\u30f3\u30c9\u5f15\u6570\u304c\u7121\u52b9\u306a\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u66f8\u5f0f\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\uff08FROM\uff09\u3068\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\uff08TO\uff09\u3092\u5c71\u62ec\u5f27\uff08&lt;&gt;\uff09\u3067\u56f2\u3080\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<h5>502: Command not implemented<\/h5>\n<p>\u9001\u4fe1\u5074\u304c\u5b9f\u884c\u3057\u3088\u3046\u3068\u3057\u305fSMTP\u30b3\u30de\u30f3\u30c9\uff08SMTP\u62e1\u5f35\u30b3\u30de\u30f3\u30c9\u306a\u3069\uff09\u306b\u3001\u53d7\u4fe1\u5074\u306e\u30b5\u30fc\u30d0\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002 <\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u62e1\u5f35\u6a5f\u80fd\u3067\u306f\u306a\u304f\u3001\u6a19\u6e96\u306eSMTP\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002EHLO\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u63a5\u7d9a\u5148\u30b5\u30fc\u30d0\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u308bSMTP\u6a5f\u80fd\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<h5>503: Bad sequence of commands<\/h5>\n<p>SMTP\u30b3\u30de\u30f3\u30c9\u3092\u9001\u4fe1\u3059\u308b\u9806\u756a\u304c\u9593\u9055\u3063\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u5b9a\u3059\u308b\u524d\u306b\u672c\u6587\u30c7\u30fc\u30bf\u3092\u9001\u308d\u3046\u3068\u3057\u305f\u308a\u30011\u3064\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u5185\u3067\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\uff08MAIL FROM\uff09\u30922\u3064\u6307\u5b9a\u3057\u305f\u308a\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\nSMTP\u30b3\u30de\u30f3\u30c9\u3092\u6b63\u3057\u3044\u9806\u5e8f\u3067\u5b9f\u884c\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u6b63\u3057\u3044\u9806\u5e8f\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002\u9593\u9055\u3048\u3066\u3044\u305f\u5834\u5408\u306f\u3001SMTP\u63a5\u7d9a\u3092\u30ea\u30bb\u30c3\u30c8\u3057\u3066\u6700\u521d\u304b\u3089\u3084\u308a\u76f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>EHLO \u2192 MAIL FROM \u2192 RCPT TO \u2192 DATA \u2192 \u30e1\u30fc\u30eb\u672c\u6587 \u2192 QUIT<\/p>\n<h5>504: Command parameter not implemented<\/h5>\n<p>\u9001\u4fe1\u3057\u305f\u30b3\u30de\u30f3\u30c9\u306f\u6709\u52b9\u3067\u3059\u304c\u3001\u63a5\u7d9a\u5148\u30b5\u30fc\u30d0\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u30b3\u30de\u30f3\u30c9\u306b\u95a2\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3042\u308b502\u30a8\u30e9\u30fc\u3068\u7570\u306a\u308a\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u95a2\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u524a\u9664\u3057\u3066\u304f\u3060\u3055\u3044\u3002EHLO\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u63a5\u7d9a\u5148\u30b5\u30fc\u30d0\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u6a5f\u80fd\u3092\u78ba\u8a8d\u3057\u3001\u305d\u306e\u6a5f\u80fd\u306e\u307f\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<h5>550: Requested action not taken: mailbox unavailable<\/h5>\n<p>\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u3001\u7121\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u3001\u307e\u305f\u306f\u5b9b\u5148\u30b5\u30fc\u30d0\u304c\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u62d2\u5426\u3057\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u6700\u3082\u4e00\u822c\u7684\u306a\u6052\u4e45\u7684\u30a8\u30e9\u30fc\u306e1\u3064\u3067\u3059\u3002\u539f\u56e0\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u7121\u52b9\u3001\u3042\u308b\u3044\u306f\u5b58\u5728\u3057\u306a\u3044<\/li>\n<li>\u53d7\u4fe1\u8005\u304c\u9001\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b<\/li>\n<li>\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u304c\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b<\/li>\n<li>\u53d7\u4fe1\u8005\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u306b\u3088\u308a\u30e1\u30fc\u30eb\u304c\u62d2\u5426\u3055\u308c\u305f<\/li>\n<li>\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u3044\u3063\u3071\u3044\u3067\u3001\u65b0\u3057\u3044\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3067\u304d\u306a\u3044<\/li>\n<\/ul>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u6709\u52b9\u3067\u6b63\u3057\u3044\u3053\u3068\u3001\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u3084IP\u30a2\u30c9\u30ec\u30b9\u304c\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u306e\u8981\u56e0\u3068\u306a\u308b\u3082\u306e\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u305d\u308c\u3067\u3082\u30a8\u30e9\u30fc\u304c\u7d99\u7d9a\u3059\u308b\u5834\u5408\u306f\u3001\u53d7\u4fe1\u8005\u306b\u4f9d\u983c\u3057\u3066\u3001\u9001\u4fe1\u5143\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u30db\u30ef\u30a4\u30c8\u30ea\u30b9\u30c8\u306b\u8ffd\u52a0\u3057\u3066\u3082\u3089\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5>551: User not local; please try [address]<\/h5>\n<p>\u5b9b\u5148\u306b\u6307\u5b9a\u3057\u305f\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u30b5\u30fc\u30d0\u306b\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u30a8\u30e9\u30fc\u3067\u306f\u3001\u8ee2\u9001\u5148\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u5b9b\u5148\u30b5\u30fc\u30d0\u304b\u3089\u6848\u5185\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n251\u3068\u306f\u7570\u306a\u308a\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u5074\u3067\u306e\u81ea\u52d5\u8ee2\u9001\u306f\u884c\u308f\u308c\u306a\u3044\u305f\u3081\u3001\u81ea\u5206\u3067\u5225\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306b\u518d\u9001\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u6b63\u3057\u3044\u5b9b\u5148\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5225\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u5b9b\u5148\u30b5\u30fc\u30d0\u304b\u3089\u6848\u5185\u3055\u308c\u305f\u5834\u5408\u306f\u3001\u305d\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306b\u9001\u4fe1\u3057\u307e\u3057\u3087\u3046\u3002\u3042\u308f\u305b\u3066\u3001\u5b9b\u5148\u30ea\u30b9\u30c8\u306e\u767b\u9332\u60c5\u5831\u3082\u5fd8\u308c\u305a\u306b\u66f4\u65b0\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5>552: Requested mail action aborted: exceeded storage allocation<\/h5>\n<p>\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u7a7a\u304d\u5bb9\u91cf\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30e1\u30fc\u30eb\u3092\u914d\u4fe1\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002452\u3068\u306f\u7570\u306a\u308a\u3001\u7279\u5b9a\u306e\u30e6\u30fc\u30b6\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u305f\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u91cf\u306b\u95a2\u3059\u308b\u554f\u984c\u3067\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u3092\u524a\u9664\u307e\u305f\u306f\u5727\u7e2e\u3057\u3066\u30e1\u30fc\u30eb\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3057\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u3001\u5225\u306e\u9023\u7d61\u624b\u6bb5\u3067\u3001\u53d7\u4fe1\u8005\u306b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u7a7a\u304d\u5bb9\u91cf\u3092\u78ba\u4fdd\u3057\u3066\u3082\u3089\u3046\u3088\u3046\u4f9d\u983c\u3057\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u6574\u7406\u304c\u7d42\u308f\u3063\u305f\u3089\u518d\u9001\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h5>553: Requested action not taken: mailbox name not allowed<\/h5>\n<p>\u5b9b\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5f62\u5f0f\u304c\u9593\u9055\u3063\u3066\u3044\u308b\u304b\u3001\u4f7f\u7528\u3067\u304d\u306a\u3044\u6587\u5b57\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u306e\u30b9\u30da\u30eb\u30df\u30b9\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u8aa4\u308a\u3001\u307e\u305f\u306f\u5b9b\u5148\u30b5\u30fc\u30d0\u5074\u306e\u547d\u540d\u898f\u5247\u306b\u9055\u53cd\u3059\u308b\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u6b63\u3057\u3044\u5f62\u5f0f\uff08\u4f8b\uff1ausername@example.com\uff09\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30c9\u30e1\u30a4\u30f3\u306b\u30b9\u30da\u30eb\u30df\u30b9\u304c\u306a\u3044\u304b\u3001\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306b\u7981\u6b62\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u3084\u30b9\u30da\u30fc\u30b9\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u304b\u3082\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5>554: Transaction failed<\/h5>\n<p>\u30e1\u30fc\u30eb\u306e\u5185\u5bb9\u3084<a href=\"https:\/\/support.sendgrid.kke.co.jp\/hc\/ja\/articles\/25050550861593\" rel=\"noopener\" target=\"_blank\">\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3<\/a>\u306b\u95a2\u3059\u308b\u69d8\u3005\u306a\u554f\u984c\u3092\u793a\u3059\u6c4e\u7528\u7684\u306a\u30a8\u30e9\u30fc\u3067\u3059\u3002\u4e00\u822c\u7684\u306a\u539f\u56e0\u3068\u3057\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u307e\u305f\u306f\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u304c\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b<\/li>\n<li>\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u306b\u3088\u3063\u3066\u62d2\u5426\u3055\u308c\u305f<\/li>\n<li>\u5b9b\u5148\u5074\u306e\u30dd\u30ea\u30b7\u30fc\u306b\u9055\u53cd\u3057\u305f\uff08\u30aa\u30d7\u30c8\u30a4\u30f3\u3057\u3066\u3044\u306a\u3044\u30a2\u30c9\u30ec\u30b9\u3078\u306e\u9001\u4fe1\u306a\u3069\uff09<\/li>\n<li>\u9001\u4fe1\u8005\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\uff08<a href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=18093\" rel=\"noopener\" target=\"_blank\">SPF\u3001DKIM\u3001DMARC<\/a>\uff09<\/li>\n<li>\u30e1\u30c3\u30bb\u30fc\u30b8\u30d8\u30c3\u30c0\u307e\u305f\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5f62\u5f0f\u304c\u4e0d\u6b63\u3067\u3042\u308b<\/li>\n<\/ul>\n<p>\u5bfe\u5fdc\u65b9\u6cd5\uff1a<br \/>\n\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u5168\u6587\u3092\u78ba\u8a8d\u3057\u3001\u5177\u4f53\u7684\u306a\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306e\u89e3\u9664\u7533\u8acb\u3084\u9001\u4fe1\u8005\u8a8d\u8a3c\u306e\u8a2d\u5b9a\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u306e\u8981\u56e0\u3068\u306a\u308a\u5f97\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u6392\u9664\u306a\u3069\u3001\u539f\u56e0\u306b\u5fdc\u3058\u3066\u5fc5\u8981\u306a\u5bfe\u51e6\u3092\u5b9f\u65bd\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u30d0\u30a6\u30f3\u30b9\u30e1\u30c3\u30bb\u30fc\u30b8\u3068\u306e\u9055\u3044<\/h3>\n<p>SMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306f\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u9593\u306eSMTP\u901a\u4fe1\u4e2d\u306b\u8fd4\u3055\u308c\u308b\u300c\u5fdc\u7b54\u30b3\u30fc\u30c9\u300d\u3067\u3059\u3002<br \/>\n\u4e00\u65b9\u3001\u30d0\u30a6\u30f3\u30b9\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u3001SMTP\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5f8c\u306b\u9001\u4fe1\u8005\u306b\u9001\u3089\u308c\u308b\u300c\u901a\u77e5\u30e1\u30fc\u30eb\u300d\u3067\u3059\u3002\u30d0\u30a6\u30f3\u30b9\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u306f\u901a\u5e38\u3001\u4ee5\u4e0b\u306e\u60c5\u5831\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u969b\u306eSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9<\/li>\n<li>\u30a8\u30e9\u30fc\u5185\u5bb9\u306e\u8aac\u660e<\/li>\n<li>\u914d\u4fe1\u306b\u5931\u6557\u3057\u305f\u30e1\u30fc\u30eb\u306e\u672c\u6587\u307e\u305f\u306f\u30d8\u30c3\u30c0<\/li>\n<li>\u5bfe\u51e6\u65b9\u6cd5<\/li>\n<\/ul>\n<p>\u30e1\u30fc\u30eb\u914d\u4fe1\u6642\u306b\u306f\u30d0\u30a6\u30f3\u30b9\u7387\u3092\u6ce8\u610f\u6df1\u304f\u76e3\u8996\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30d0\u30a6\u30f3\u30b9\u7387\u304c\u9ad8\u3044\u3068\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u640d\u306a\u308f\u308c\u3001\u9001\u4fe1\u3059\u308b\u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u306e\u5230\u9054\u6027\u306b\u554f\u984c\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u304a\u308f\u308a\u306b<\/h3>\n<p>\u30e1\u30fc\u30eb\u306f\u8907\u6570\u306eSMTP\u30b5\u30fc\u30d0\u3092\u7d4c\u7531\u3057\u3066\u30ea\u30ec\u30fc\u3055\u308c\u307e\u3059\u3002\u4eca\u56de\u306f\u3001\u3053\u306e\u30ea\u30ec\u30fc\u306e\u969b\u306b\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u540c\u58eb\u3067\u3084\u308a\u53d6\u308a\u3055\u308c\u308bSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>Twilio SendGrid\u306f<a href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=636\" rel=\"noopener\" target=\"_blank\">SMTP\u30ea\u30ec\u30fc\u30b5\u30fc\u30d3\u30b9<\/a>\u3068\u3057\u3066\u3082\u6a5f\u80fd\u3057\u3001\u6bce\u67082,000\u5104\u901a\u3082\u306e\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u30e1\u30fc\u30eb\u3084\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u307e\u305a\u306f<a href=\"https:\/\/support.sendgrid.kke.co.jp\/hc\/ja\/articles\/204906155\" rel=\"noopener\" target=\"_blank\">\u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb<\/a>\u304b\u3089\u59cb\u3081\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<\/p>\n<h3>\u3088\u304f\u3042\u308b\u8cea\u554f<\/h3>\n<p><strong>Q\uff1aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u72b6\u6cc1\u3092\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u540c\u58eb\u3067\u3084\u308a\u3068\u308a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b3\u6841\u306e\u6570\u5b57\u3067\u3059\u3002\u30e1\u30fc\u30eb\u304c\u6b63\u5e38\u306b\u914d\u4fe1\u3055\u308c\u305f\u306e\u304b\u3001\u4e00\u6642\u7684\u306b\u5931\u6557\u3057\u305f\u306e\u304b\u3001\u307e\u305f\u306f\u5b8c\u5168\u306b\u62d2\u5426\u3055\u308c\u305f\u306e\u304b\u3092\u793a\u3057\u307e\u3059\u3002\u914d\u4fe1\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3001\u9069\u5207\u306b\u5bfe\u51e6\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p><strong>Q\uff1aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9\u304c250\u3068\u306f\u3069\u3046\u3044\u3046\u610f\u5473\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u914d\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u304c\u30b5\u30fc\u30d0\u306b\u53d7\u3051\u4ed8\u3051\u3089\u308c\u3001\u914d\u4fe1\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3055\u308c\u305f\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30e1\u30fc\u30eb\u304c\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u5c4a\u304f\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a3\u30eb\u30bf\u306b\u3088\u3063\u3066\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u308a\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><strong>Q\uff1aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c94xx\u30685xx\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>4xx\u306f\u4e00\u6642\u7684\u306a\u914d\u4fe1\u30a8\u30e9\u30fc\u3092\u793a\u3059\u30b3\u30fc\u30c9\u3067\u3059\u3002\u6642\u9593\u3092\u304a\u304f\u3053\u3068\u3067\u81ea\u7136\u306b\u89e3\u6c7a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u306f\u3001\u6642\u9593\u3092\u304a\u3044\u3066\u518d\u9001\u3059\u308b\u3088\u3046\u306b\u6c42\u3081\u3066\u3044\u307e\u3059\u3002<br \/>\n\u4e00\u65b9\u30015xx\u306f\u6052\u4e45\u7684\u306a\u914d\u4fe1\u30a8\u30e9\u30fc\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u539f\u56e0\u3092\u89e3\u6d88\u3057\u306a\u3044\u9650\u308a\u30e1\u30fc\u30eb\u306f\u5b9b\u5148\u306b\u5c4a\u304b\u306a\u3044\u305f\u3081\u3001\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3001\u9069\u5207\u306a\u5bfe\u51e6\u3092\u3057\u305f\u5f8c\u3067\u30e1\u30fc\u30eb\u3092\u518d\u9001\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><strong>Q\uff1aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c9421\u306f\u3069\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u304b\uff1f<\/strong><\/p>\n<p>421\u30a8\u30e9\u30fc\u306f\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u304c\u4e00\u6642\u7684\u306b\u5229\u7528\u3067\u304d\u306a\u3044\u3001\u307e\u305f\u306f\u904e\u8ca0\u8377\u72b6\u614b\u306b\u3042\u308b\u5834\u5408\u306b\u8fd4\u3055\u308c\u307e\u3059\u3002\u77ed\u6642\u9593\u306b\u5927\u91cf\u306e\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u305f\u3053\u3068\u3067\u5b9b\u5148\u30b5\u30fc\u30d0\u304b\u3089\u4e00\u6642\u7684\u306a\u53d7\u4fe1\u5236\u9650\u3092\u53d7\u3051\u3066\u3044\u305f\u308a\u3001\u5b9b\u5148\u30b5\u30fc\u30d0\u306b\u9ad8\u3044\u8ca0\u8377\u304c\u304b\u304b\u3063\u3066\u3044\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3053\u306e\u30a8\u30e9\u30fc\u304c\u8fd4\u3055\u308c\u305f\u5834\u5408\u306f\u300115\uff5e30\u5206\u307b\u3069\u5f85\u3063\u3066\u304b\u3089\u518d\u9001\u3092\u8a66\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u518d\u9001\u3057\u3066\u3082\u6539\u5584\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u518d\u9001\u9593\u9694\u3092\u5f90\u3005\u306b\u9577\u304f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>Q\uff1aSMTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30b3\u30fc\u30c95xx\u304c\u8fd4\u3055\u308c\u305f\u5834\u5408\u3001\u30e1\u30fc\u30eb\u3092\u518d\u9001\u3059\u3079\u304d\u3067\u3057\u3087\u3046\u304b\uff1f<\/strong><\/p>\n<p>\u3044\u3044\u3048\u30025xx\u306f\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc\u3067\u3059\u3002\u6839\u672c\u7684\u306a\u554f\u984c\u3092\u89e3\u6c7a\u305b\u305a\u306b\u518d\u9001\u3059\u308b\u3068\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\uff08\u9001\u4fe1\u8005\u306e\u4fe1\u983c\u6027\uff09\u3092\u640d\u306a\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u518d\u9001\u3092\u8a66\u307f\u308b\u524d\u306b\u5fc5\u305a\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3001\u5fc5\u8981\u306a\u5bfe\u51e6\u3092\u8b1b\u3058\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u306f SMTP Error Codes: What Do These Server Responses Mean? \u306e\u6284\u8a33\u3067\u3059\u3002 \u30e1\u30fc\u30eb\u306f\u3042\u308b\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u304b\u3089\u5225\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3078\u3068SMTP\u30b5\u30fc\u30d0\uff08\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\uff09\u3092\u7d4c\u7531 <a class=\"read-more\" href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=1308\">&#8230;\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":2,"featured_media":21096,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1308","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1308"}],"version-history":[{"count":8,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1308\/revisions"}],"predecessor-version":[{"id":21109,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1308\/revisions\/21109"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/media\/21096"}],"wp:attachment":[{"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sendgrid.kke.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}