{"id":22004,"date":"2026-04-23T13:26:37","date_gmt":"2026-04-23T04:26:37","guid":{"rendered":"https:\/\/blastmail.jp\/blog\/?p=22004"},"modified":"2026-04-23T15:31:55","modified_gmt":"2026-04-23T06:31:55","slug":"envelope-from","status":"publish","type":"post","link":"https:\/\/blastmail.jp\/blog\/spam\/envelope-from","title":{"rendered":"\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u306f\uff1f\u30d8\u30c3\u30c0From\u3068\u306e\u9055\u3044\u30fb\u5f79\u5272\u30fb\u78ba\u8a8d\u65b9\u6cd5\u3092\u5fb9\u5e95\u89e3"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2026\/04\/envelope-from.jpg\" alt=\"\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u306f\uff1f\u30d8\u30c3\u30c0From\u3068\u306e\u9055\u3044\u30fb\u5f79\u5272\u30fb\u78ba\u8a8d\u65b9\u6cd5\u3092\u5fb9\u5e95\u89e3\" width=\"1024\" height=\"572\" class=\"alignnone size-full wp-image-22006\" 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href=\"https:\/\/blastmail.jp\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2023\/01\/bm_banner_big_mailsystem_1200x628.png\" alt=\"blastmail\u306e\u30d0\u30ca\u30fc\" width=\"1200\" height=\"629\" class=\"alignnone wp-image-19829 size-full\" 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From\uff09\u3068\u306f\u3001\u30e1\u30fc\u30eb\u3092\u9001\u53d7\u4fe1\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u9593\u306eSMTP\u901a\u4fe1\u306b\u304a\u3044\u3066\u4f7f\u7528\u3055\u308c\u308b\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u3092\u624b\u7d19\u306b\u4f8b\u3048\u308b\u3068\u975e\u5e38\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li><strong>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From<\/strong>\u3000\uff1d\u3000\u5c01\u7b52\u306e\u8868\u306b\u66f8\u304f\u5dee\u51fa\u4eba\uff08\u90f5\u4fbf\u5c40\u304c\u914d\u9001\u306b\u4f7f\u3046\u60c5\u5831\uff09<\/li>\n<li><strong>\u30d8\u30c3\u30c0From<\/strong>\u3000\uff1d\u3000\u5c01\u7b52\u306e\u4e2d\u306e\u4fbf\u7b8b\u306b\u66f8\u304f\u5dee\u51fa\u4eba\uff08\u53d7\u53d6\u4eba\u304c\u76ee\u306b\u3059\u308b\u60c5\u5831\uff09<\/li>\n<\/ul>\n<\/div>\n<p>\u90f5\u4fbf\u3067\u306f\u3001\u914d\u9054\u54e1\u306f\u5c01\u7b52\u306e\u5916\u5074\u306b\u66f8\u304b\u308c\u305f\u5b9b\u5148\u3068\u5dee\u51fa\u4eba\u306e\u60c5\u5831\u3092\u3082\u3068\u306b\u914d\u9054\u3057\u307e\u3059\u3002\u4fbf\u7b8b\u306e\u5185\u5bb9\u306f\u914d\u9054\u306b\u306f\u95a2\u4fc2\u3042\u308a\u307e\u305b\u3093\u3002\u96fb\u5b50\u30e1\u30fc\u30eb\u3082\u540c\u69d8\u306b\u3001MTA\uff08\u30e1\u30fc\u30eb\u8ee2\u9001\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\uff09\u306f\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u306e\u60c5\u5831\u3092\u3082\u3068\u306b\u30e1\u30fc\u30eb\u3092\u914d\u9001\u3057\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306fSMTP\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u300cMAIL FROM:\u300d\u30b3\u30de\u30f3\u30c9\u3067\u9001\u4fe1\u3055\u308c\u308b\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u30e1\u30fc\u30eb\u304c\u6b63\u5e38\u306b\u5c4a\u3044\u305f\u5834\u5408\u306b\u306f\u53c2\u7167\u3055\u308c\u308b\u3053\u3068\u306a\u304f\u6d88\u3048\u307e\u3059\u304c\u3001<strong>\u914d\u9001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u969b\u306e\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\uff08\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\uff09\u306e\u8fd4\u9001\u5148<\/strong>\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30d8\u30c3\u30c0From\u3068\u306e\u9055\u3044\u3092\u6574\u7406\u3059\u308b<\/h3>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u30d8\u30c3\u30c0From\u306e\u9055\u3044\u3092\u307e\u3068\u3081\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<div class=\"su-table su-table-alternate\">\n<table>\n<thead>\n<tr>\n<th>\u9805\u76ee<\/th>\n<th>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From<\/th>\n<th>\u30d8\u30c3\u30c0From<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5f79\u5272<\/td>\n<td>\u30b5\u30fc\u30d0\u30fc\u9593\u306e\u914d\u9001\u51e6\u7406\u306b\u4f7f\u7528<\/td>\n<td>\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30e9\u30fc\u306b\u5dee\u51fa\u4eba\u3068\u3057\u3066\u8868\u793a<\/td>\n<\/tr>\n<tr>\n<td>\u8868\u793a<\/td>\n<td>\u901a\u5e38\u3001\u53d7\u4fe1\u8005\u306b\u306f\u898b\u3048\u306a\u3044<\/td>\n<td>\u30e1\u30fc\u30e9\u30fc\u306e\u300c\u5dee\u51fa\u4eba\u300d\u6b04\u306b\u8868\u793a\u3055\u308c\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u7167\u7b87\u6240<\/td>\n<td>\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u306eReturn-Path<\/td>\n<td>\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u306eFrom<\/td>\n<\/tr>\n<tr>\n<td>\u8a2d\u5b9a\u306e\u81ea\u7531\u5ea6<\/td>\n<td>\u9001\u4fe1\u5143\u30b5\u30fc\u30d0\u30fc\u304c\u8a2d\u5b9a\uff08\u81ea\u7531\u306b\u306f\u5909\u66f4\u3067\u304d\u306a\u3044\uff09<\/td>\n<td>\u9001\u4fe1\u8005\u304c\u81ea\u7531\u306b\u8a2d\u5b9a\u53ef\u80fd<\/td>\n<\/tr>\n<tr>\n<td>\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb<\/td>\n<td>\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306e\u8fd4\u9001\u5148\u306b\u306a\u308b<\/td>\n<td>\u306a\u3089\u306a\u3044<\/td>\n<\/tr>\n<tr>\n<td>SPF\u8a8d\u8a3c<\/td>\n<td>\u8a8d\u8a3c\u306e\u5bfe\u8c61\u306b\u306a\u308b<\/td>\n<td>\u76f4\u63a5\u306e\u5bfe\u8c61\u306b\u306f\u306a\u3089\u306a\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\u30d8\u30c3\u30c0From\u306f\u9001\u4fe1\u8005\u304c\u81ea\u7531\u306b\u8a2d\u5b9a\u3067\u304d\u308b\u305f\u3081\u3001\u53d7\u4fe1\u8005\u306b\u306f\u4efb\u610f\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u5dee\u51fa\u4eba\u3068\u3057\u3066\u898b\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4e00\u65b9\u3067\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306fSMTP\u901a\u4fe1\u3067\u4f7f\u7528\u3055\u308c\u308b\u672c\u6765\u306e\u9001\u4fe1\u5143\u60c5\u5831\u3067\u3042\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u9593\u306e\u4fe1\u983c\u6027\u78ba\u8a8d\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u4ed5\u69d8\u306e\u9055\u3044\u304c\u3001\u5f8c\u8ff0\u3059\u308b\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306e\u30ea\u30b9\u30af\u3084SPF\u8a8d\u8a3c\u3068\u306e\u95a2\u4fc2\u306b\u76f4\u7d50\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u304c\u30e1\u30fc\u30eb\u914d\u4fe1\u3067\u91cd\u8981\u306a\u7406\u7531<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306f\u5358\u306a\u308b\u6280\u8853\u7528\u8a9e\u3067\u306f\u306a\u304f\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u54c1\u8cea\u3092\u5de6\u53f3\u3059\u308b\u91cd\u8981\u306a\u8a2d\u5b9a\u3067\u3059\u3002\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306e\u51e6\u7406\u304b\u3089SPF\u8a8d\u8a3c\u307e\u3067\u3001\u5b9f\u52d9\u306b\u76f4\u7d50\u3059\u308b\u5f79\u5272\u3092\u62c5\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\uff08\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\uff09\u306e\u7ba1\u7406<\/h3>\n<p>\u30e1\u30fc\u30eb\u914d\u4fe1\u3092\u884c\u3046\u969b\u3001\u5b9b\u5148\u4e0d\u660e\u3084\u53d7\u4fe1\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u91cf\u8d85\u904e\u306a\u3069\u306e\u7406\u7531\u3067\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u3044\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u3001\u9001\u4fe1\u5148\u30b5\u30fc\u30d0\u30fc\u306f<strong>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u8a18\u8f09\u3055\u308c\u305f\u30a2\u30c9\u30ec\u30b9<\/strong>\u306b\u30a8\u30e9\u30fc\u901a\u77e5\uff08\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\uff09\u3092\u8fd4\u9001\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f01\u696d\u304c\u81ea\u793e\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u305d\u306e\u307e\u307e\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u5927\u91cf\u914d\u4fe1\u306e\u305f\u3073\u306b\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\u304c\u62c5\u5f53\u8005\u306e\u53d7\u4fe1\u7bb1\u306b\u5c4a\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u901a\u5e38\u306e\u30d3\u30b8\u30cd\u30b9\u30e1\u30fc\u30eb\u3068\u6df7\u5728\u3059\u308b\u305f\u3081\u3001\u7ba1\u7406\u304c\u975e\u5e38\u306b\u7169\u96d1\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u591a\u304f\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u30b7\u30b9\u30c6\u30e0\u5c02\u7528\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u8a2d\u5b9a\u3057\u3001\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u3092\u81ea\u52d5\u53ce\u96c6\u30fb\u5206\u6790\u3059\u308b\u4ed5\u7d44\u307f\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u3069\u306e\u914d\u4fe1\u3067\u3069\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u304b\u3092\u81ea\u52d5\u7684\u306b\u628a\u63e1\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>SPF\u8a8d\u8a3c\u306e\u6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Policy Framework\uff09\u306f\u3001\u30e1\u30fc\u30eb\u306e\u306a\u308a\u3059\u307e\u3057\u3092\u9632\u3050\u305f\u3081\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\u3067\u3059\u3002\u3053\u306eSPF\u8a8d\u8a3c\u3067\u306f\u3001<strong>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3<\/strong>\u304c\u8a8d\u8a3c\u306e\u5bfe\u8c61\u306b\u306a\u308a\u307e\u3059\u3002SPF\u8a8d\u8a3c\u306e\u4ed5\u7d44\u307f\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li>\u53d7\u4fe1\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u3001\u63a5\u7d9a\u3057\u3066\u304d\u305f\u9001\u4fe1\u5143\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3059\u308b<\/li>\n<li>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u306eDNS\u306b\u767b\u9332\u3055\u308c\u305fSPF\u30ec\u30b3\u30fc\u30c9\uff08\u8a31\u53efIP\u30ea\u30b9\u30c8\uff09\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<li>\u9001\u4fe1\u5143IP\u3068SPF\u30ec\u30b3\u30fc\u30c9\u306eIP\u304c\u4e00\u81f4\u3059\u308c\u3070\u300cSPF\u8a8d\u8a3cPass\u300d\u3001\u4e0d\u4e00\u81f4\u306a\u3089\u300c\u306a\u308a\u3059\u307e\u3057\u306e\u53ef\u80fd\u6027\u3042\u308a\u300d\u3068\u5224\u65ad\u3055\u308c\u308b<\/li>\n<\/ul>\n<\/div>\n<p>\u3064\u307e\u308a\u3001<span style=\"color: #ff0000;\"><strong>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u9069\u5207\u306aSPF\u30ec\u30b3\u30fc\u30c9\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u3001\u6b63\u898f\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u3067\u3042\u3063\u3066\u3082\u8ff7\u60d1\u30e1\u30fc\u30eb\u3068\u3057\u3066\u5224\u5b9a\u3055\u308c\u308b\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059<\/strong><\/span>\u3002<\/p>\n<p>\u7279\u306b\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u81ea\u793e\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3068\u306f\u7570\u306a\u308bIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u9001\u4fe1\u3055\u308c\u308b\u305f\u3081\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306b\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u304b\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3092\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306b\u8a2d\u5b9a\u3059\u308b\u5bfe\u5fdc\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u30d8\u30c3\u30c0From\u304c\u7570\u306a\u308b\u30b1\u30fc\u30b9<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u30d8\u30c3\u30c0From\u304c\u5225\u3005\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u306a\u308b\u306e\u306f\u3001\u7279\u6b8a\u306a\u72b6\u6cc1\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5916\u90e8\u306e\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u4f01\u696d\u3067\u306f\u3001\u3080\u3057\u308d\u65e5\u5e38\u7684\u306b\u767a\u751f\u3057\u3066\u3044\u308b\u69cb\u6210\u3067\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3057\u305f\u4ee3\u7406\u9001\u4fe1<\/h3>\n<p>\u5b9f\u52d9\u3067\u3088\u304f\u898b\u3089\u308c\u308b\u306e\u304c\u3001\u5916\u90e8\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3092\u4f7f\u3063\u3066\u81ea\u793e\u540d\u7fa9\u3067\u30e1\u30fc\u30eb\u3092\u9001\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u5834\u5408\u3001\u5b9f\u969b\u306e\u9001\u4fe1\u306f\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u884c\u308f\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u306f\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u304c\u3001\u30d8\u30c3\u30c0From\u306b\u306f\u81ea\u793e\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u53d7\u4fe1\u8005\u306b\u306f\u81ea\u793e\u304b\u3089\u306e\u30e1\u30fc\u30eb\u3068\u3057\u3066\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30e9\u30fc\u306b\u306f\u300c\u25cb\u25cb\u682a\u5f0f\u4f1a\u793e &lt;info@example.com&gt;\u300d\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u304c\u3001\u5b9f\u969b\u306e\u914d\u9001\u306f\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u306e\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u4ee3\u7406\u9001\u4fe1\u3067\u306f\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066SPF\u30ec\u30b3\u30fc\u30c9\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u306a\u308a\u3059\u307e\u3057\u5224\u5b9a\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u8ee2\u9001\u6642\u306e\u66f8\u304d\u63db\u3048<\/h3>\n<p>\u30e1\u30fc\u30eb\u304c\u5225\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u8ee2\u9001\u3055\u308c\u308b\u5834\u5408\u3082\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u304c\u66f8\u304d\u63db\u308f\u308a\u307e\u3059\u3002<\/p>\n<p>\u8ee2\u9001\u3092\u884c\u3046\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3092\u8ee2\u9001\u5143\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u66f4\u3057\u3066\u518d\u9001\u4fe1\u3057\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u3001\u30d8\u30c3\u30c0From\u306b\u306f\u5143\u306e\u9001\u4fe1\u8005\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u6b8b\u3063\u305f\u307e\u307e\u8ee2\u9001\u3055\u308c\u308b\u305f\u3081\u3001\u53d7\u4fe1\u8005\u306b\u306f\u5143\u306e\u5dee\u51fa\u4eba\u304c\u8868\u793a\u3055\u308c\u7d9a\u3051\u307e\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306e\u30ea\u30b9\u30af<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u4ed5\u7d44\u307f\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u5f31\u70b9\u306b\u3082\u306a\u308a\u5f97\u307e\u3059\u3002\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u304c\u3069\u306e\u3088\u3046\u306b\u6210\u7acb\u3059\u308b\u306e\u304b\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3001\u9069\u5207\u306a\u5bfe\u7b56\u306e\u7b2c\u4e00\u6b69\u3067\u3059\u3002<\/p>\n<h3>\u30d8\u30c3\u30c0From\u306f\u81ea\u7531\u306b\u8a2d\u5b9a\u3067\u304d\u308b<\/h3>\n<p>\u524d\u8ff0\u306e\u3068\u304a\u308a\u3001\u30d8\u30c3\u30c0From\u306f\u9001\u4fe1\u8005\u304c\u81ea\u7531\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u5229\u4fbf\u6027\u3092\u9ad8\u3081\u308b\u4e00\u65b9\u3067\u3001<span style=\"color: #ff0000;\"><strong>\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306e\u30ea\u30b9\u30af<\/strong><\/span>\u3092\u751f\u3080\u539f\u56e0\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u60aa\u610f\u3042\u308b\u7b2c\u4e09\u8005\u304c\u3001\u5b9f\u5728\u3059\u308b\u4f01\u696d\u3084\u91d1\u878d\u6a5f\u95a2\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u30d8\u30c3\u30c0From\u306b\u8a2d\u5b9a\u3057\u3066\u9001\u4fe1\u3059\u308b\u3053\u3068\u3067\u3001\u53d7\u4fe1\u8005\u306b\u306f\u672c\u7269\u306e\u9001\u4fe1\u8005\u304b\u3089\u5c4a\u3044\u305f\u3088\u3046\u306b\u898b\u305b\u304b\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5b9f\u969b\u306b\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u8a50\u6b3a\u3084\u30d3\u30b8\u30cd\u30b9\u30e1\u30fc\u30eb\u8a50\u6b3a\uff08BEC\uff09\u306e\u591a\u304f\u304c\u3053\u306e\u4ed5\u7d44\u307f\u3092\u60aa\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u53d7\u4fe1\u8005\u304c\u666e\u6bb5\u76ee\u306b\u3059\u308b\u306e\u306f\u30d8\u30c3\u30c0From\u306e\u30a2\u30c9\u30ec\u30b9\u3060\u3051\u3067\u3042\u308a\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3092\u308f\u3056\u308f\u3056\u78ba\u8a8d\u3059\u308b\u3053\u3068\u306f\u307b\u3068\u3093\u3069\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306b\u6c17\u3065\u304b\u306a\u3044\u30b1\u30fc\u30b9\u304c\u591a\u3044\u306e\u3067\u3059\u3002<\/p>\n<h3>SPF\u30fbDKIM\u30fbDMARC\u306e\u4e09\u5c64\u9632\u5fa1<\/h3>\n<p>\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u3068\u3057\u3066\u3001\u73fe\u5728\u306f3\u3064\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li><strong>SPF\uff08Sender Policy Framework\uff09\uff1a<\/strong>\n\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u8a8d\u8a3c\u3092\u884c\u3044\u307e\u3059\u3002\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u304cDNS\u306eSPF\u30ec\u30b3\u30fc\u30c9\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308bIP\u3068\u4e00\u81f4\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/li>\n<li><strong>DKIM\uff08DomainKeys Identified Mail\uff09\uff1a<\/strong>\n\u30e1\u30fc\u30eb\u306b\u96fb\u5b50\u7f72\u540d\u3092\u4ed8\u4e0e\u3057\u3001\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u306e\u6b63\u5f53\u6027\u3068\u30e1\u30fc\u30eb\u5185\u5bb9\u306e\u6539\u3056\u3093\u304c\u306a\u3044\u304b\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002SPF\u306fIP\u30a2\u30c9\u30ec\u30b9\u306b\u3088\u308b\u8a8d\u8a3c\u3067\u3042\u308b\u306e\u306b\u5bfe\u3057\u3001DKIM\u306f\u7f72\u540d\u306b\u3088\u308b\u8a8d\u8a3c\u3067\u3059\u3002<\/li>\n<li><strong>DMARC\uff08Domain-based Message Authentication, Reporting, and Conformance\uff09\uff1a<\/strong>\nSPF\u3068DKIM\u306e\u8a8d\u8a3c\u7d50\u679c\u306b\u52a0\u3048\u3066\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u3068\u30d8\u30c3\u30c0From\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\uff08\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\uff09\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002SPF\u3084DKIM\u3092\u3059\u308a\u629c\u3051\u305f\u306a\u308a\u3059\u307e\u3057\u3082DMARC\u3067\u691c\u77e5\u3067\u304d\u308b\u305f\u3081\u3001\u4e09\u5c64\u9632\u5fa1\u306e\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div>\n<p>\u7279\u306b\u30ad\u30e3\u30ea\u30a2\u30e1\u30fc\u30eb\u3084Gmail\u306a\u3069\u306e\u53d7\u4fe1\u74b0\u5883\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u8a8d\u8a3c\u304c\u6574\u3063\u3066\u3044\u306a\u3044\u3068\u8ff7\u60d1\u30e1\u30fc\u30eb\u3078\u306e\u632f\u308a\u5206\u3051\u3084\u53d7\u4fe1\u62d2\u5426\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u30e1\u30fc\u30eb\u5230\u9054\u7387\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u3082\u3001SPF\u30fbDKIM\u30fbDMARC\u306e\u8a2d\u5b9a\u306f\u5fc5\u9808\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306f\u901a\u5e38\u306e\u753b\u9762\u306b\u306f\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u304c\u3001\u30e1\u30fc\u30eb\u306e\u30d8\u30c3\u30c0\u30fc\u60c5\u5831\u3092\u53c2\u7167\u3059\u308c\u3070\u8ab0\u3067\u3082\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u4e3b\u8981\u306a\u30e1\u30fc\u30e9\u30fc\u3054\u3068\u306e\u624b\u9806\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306f\u901a\u5e38\u306e\u30e1\u30fc\u30eb\u8868\u793a\u753b\u9762\u3067\u306f\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u3002\u30e1\u30fc\u30eb\u306e\u300c\u30d8\u30c3\u30c0\u30fc\u60c5\u5831\u300d\u3084\u300c\u539f\u6587\u8868\u793a\u300d\u304b\u3089\u3001<strong>Return-Path\u30d8\u30c3\u30c0\u30fc<\/strong>\u3068\u3057\u3066\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>Gmail\u3067\u306e\u78ba\u8a8d\u624b\u9806<\/h3>\n<div class=\"list04\">\n<ul>\n<li>\u78ba\u8a8d\u3057\u305f\u3044\u30e1\u30fc\u30eb\u3092\u958b\u304f<\/li>\n<li>\u53f3\u4e0a\u306e\u300c\ufe19\uff08\u305d\u306e\u4ed6\uff09\u300d\u3092\u30af\u30ea\u30c3\u30af<\/li>\n<li>\u300c\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30bd\u30fc\u30b9\u3092\u8868\u793a\u300d\u3092\u9078\u629e<\/li>\n<li>\u8868\u793a\u3055\u308c\u305f\u30d8\u30c3\u30c0\u30fc\u5185\u306e\u300cReturn-Path:\u300d\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<\/ul>\n<\/div>\n<p><code>Return-Path: &lt;bounce@mailsystem.example.com&gt;<\/code> \u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u30a2\u30c9\u30ec\u30b9\u304c\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3067\u3059\u3002<\/p>\n<h3>Outlook\u3067\u306e\u78ba\u8a8d\u624b\u9806<\/h3>\n<div class=\"list04\">\n<ul>\n<li>\u78ba\u8a8d\u3057\u305f\u3044\u30e1\u30fc\u30eb\u3092\u30c0\u30d6\u30eb\u30af\u30ea\u30c3\u30af\u3057\u3066\u958b\u304f<\/li>\n<li>\u300c\u30d5\u30a1\u30a4\u30eb\u300d\u30bf\u30d6\u3092\u30af\u30ea\u30c3\u30af<\/li>\n<li>\u300c\u30d7\u30ed\u30d1\u30c6\u30a3\u300d\u3092\u9078\u629e<\/li>\n<li>\u300c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d8\u30c3\u30c0\u30fc\u300d\u306b\u8868\u793a\u3055\u308c\u305f\u5185\u5bb9\u304b\u3089\u300cReturn-Path:\u300d\u3092\u63a2\u3059<\/li>\n<\/ul>\n<\/div>\n<h3>Thunderbird\u3067\u306e\u78ba\u8a8d\u624b\u9806<\/h3>\n<div class=\"list04\">\n<ul>\n<li>\u78ba\u8a8d\u3057\u305f\u3044\u30e1\u30fc\u30eb\u3092\u53f3\u30af\u30ea\u30c3\u30af<\/li>\n<li>\u300c\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30bd\u30fc\u30b9\u3092\u8868\u793a\u300d\u3092\u9078\u629e<\/li>\n<li>\u8868\u793a\u3055\u308c\u305f\u5185\u5bb9\u304b\u3089\u300cReturn-Path:\u300d\u3092\u63a2\u3059<\/li>\n<\/ul>\n<\/div>\n<p>\u914d\u4fe1\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u8abf\u67fb\u3084\u3001\u53d7\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u304c\u672c\u5f53\u306b\u6b63\u898f\u306e\u9001\u4fe1\u5143\u304b\u3089\u5c4a\u3044\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u969b\u306b\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u78ba\u8a8d\u306f\u91cd\u8981\u306a\u624b\u304c\u304b\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068Return-Path\u306e\u95a2\u4fc2<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068Return-Path\u306f\u6df7\u540c\u3055\u308c\u3084\u3059\u3044\u6982\u5ff5\u3067\u3059\u304c\u3001\u6307\u3057\u3066\u3044\u308b\u60c5\u5831\u306f\u540c\u3058\u3067\u3082\u3001\u53c2\u7167\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u4e21\u8005\u306e\u9055\u3044\u3092\u6574\u7406\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068Return-Path\u306f\u3001\u3057\u3070\u3057\u3070\u540c\u7fa9\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u304c\u3001\u53b3\u5bc6\u306b\u306f\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From<\/strong>\u306f\u3001SMTP\u306e\u300cMAIL FROM:\u300d\u30b3\u30de\u30f3\u30c9\u3067\u9001\u4fe1\u3055\u308c\u308b\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u30e1\u30fc\u30eb\u304c\u914d\u9001\u3055\u308c\u308b\u969b\u306b\u4f7f\u308f\u308c\u308b\u60c5\u5831\u3067\u3042\u308a\u3001\u914d\u9001\u304c\u5b8c\u4e86\u3059\u308b\u3068\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u60c5\u5831\u81ea\u4f53\u306f\u6d88\u3048\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001<strong>Return-Path<\/strong>\u306f\u3001\u30e1\u30fc\u30eb\u304c\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u306b\u5c4a\u3044\u305f\u5f8c\u306b\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u306b\u8a18\u9332\u3055\u308c\u308b\u60c5\u5831\u3067\u3059\u3002\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u304c\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u5024\u3092Return-Path\u30d8\u30c3\u30c0\u3068\u3057\u3066\u4fdd\u5b58\u3059\u308b\u305f\u3081\u3001\u53d7\u4fe1\u5f8c\u306bReturn-Path\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u3067\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3057\u305f\u5f8c\u306b\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001Return-Path\u30d8\u30c3\u30c0\u3092\u53c2\u7167\u3059\u308b\u306e\u304c\u6b63\u3057\u3044\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u95a2\u3059\u308b\u3088\u304f\u3042\u308b\u8a2d\u5b9a\u30df\u30b9\u3068\u5bfe\u51e6\u6cd5<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u8a2d\u5b9a\u306f\u4e00\u898b\u30b7\u30f3\u30d7\u30eb\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u5b9f\u904b\u7528\u3067\u306f\u898b\u843d\u3068\u3057\u304c\u3061\u306a\u30df\u30b9\u304c\u767a\u751f\u3057\u3084\u3059\u3044\u7b87\u6240\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3068\u5bfe\u51e6\u6cd5\u3092\u78ba\u8a8d\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u81ea\u793e\u306e\u30d3\u30b8\u30cd\u30b9\u30a2\u30c9\u30ec\u30b9\u3092\u305d\u306e\u307e\u307e\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u8a2d\u5b9a\u3057\u3066\u3057\u307e\u3046<\/h3>\n<p>\u6700\u3082\u591a\u3044\u30df\u30b9\u304c\u3001\u81ea\u793e\u306e\u554f\u3044\u5408\u308f\u305b\u7528\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\uff08\u4f8b\uff1a<code>info@example.com<\/code>\uff09\u3092\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u305d\u306e\u307e\u307e\u8a2d\u5b9a\u3059\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u72b6\u614b\u3067\u5927\u91cf\u914d\u4fe1\u3092\u884c\u3046\u3068\u3001\u5b9b\u5148\u4e0d\u660e\u3084\u53d7\u4fe1\u62d2\u5426\u306a\u3069\u3067\u767a\u751f\u3057\u305f\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u304c\u3059\u3079\u3066 <code>info@example.com<\/code> \u306b\u8fd4\u9001\u3055\u308c\u307e\u3059\u3002\u6570\u5343\u4ef6\u30fb\u6570\u4e07\u4ef6\u306e\u914d\u4fe1\u3067\u306f\u3001\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\u3060\u3051\u3067\u53d7\u4fe1\u7bb1\u304c\u3042\u3075\u308c\u8fd4\u308a\u3001\u901a\u5e38\u306e\u554f\u3044\u5408\u308f\u305b\u30e1\u30fc\u30eb\u304c\u57cb\u3082\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<div class=\"box01\"><span class=\"box-title\">\u5bfe\u51e6\u6cd5<\/span>\n<ul>\n<li>\u30e1\u30fc\u30eb\u914d\u4fe1\u5c02\u7528\u306e\u30a8\u30e9\u30fc\u53d7\u4fe1\u30a2\u30c9\u30ec\u30b9\uff08\u4f8b\uff1abounce@example.com\uff09\u3092\u7528\u610f\u3057\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u306f\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u591a\u304f\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u3053\u306e\u8a2d\u5b9a\u3092\u30b7\u30b9\u30c6\u30e0\u5074\u3067\u81ea\u52d5\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div>\n<h3>SPF\u30ec\u30b3\u30fc\u30c9\u306b\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u8ffd\u52a0\u3057\u3066\u3044\u306a\u3044<\/h3>\n<p>\u5916\u90e8\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3092\u4f7f\u3044\u59cb\u3081\u305f\u3082\u306e\u306e\u3001\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306eSPF\u30ec\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3057\u3066\u3044\u306a\u3044\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u8a2d\u5b9a\u3057\u306a\u304c\u3089\u3001SPF\u30ec\u30b3\u30fc\u30c9\u304c\u53e4\u3044\u307e\u307e\u3060\u3068\u3001\u53d7\u4fe1\u5074\u30b5\u30fc\u30d0\u30fc\u306f\u300cSPF\u30ec\u30b3\u30fc\u30c9\u306b\u8a18\u8f09\u306e\u306a\u3044IP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u306e\u30e1\u30fc\u30eb\u300d\u3068\u3057\u3066\u5224\u65ad\u3057\u3001\u306a\u308a\u3059\u307e\u3057\u306e\u53ef\u80fd\u6027\u3042\u308a\u3068\u3057\u3066\u8ff7\u60d1\u30e1\u30fc\u30eb\u6271\u3044\u306b\u3057\u307e\u3059\u3002<\/p>\n<div class=\"box01\"><span class=\"box-title\">\u5bfe\u51e6\u6cd5<\/span>\n<ul>\n<li>\u5229\u7528\u3059\u308b\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u304c\u6307\u5b9a\u3059\u308bIP\u30a2\u30c9\u30ec\u30b9\u307e\u305f\u306f\u30c9\u30e1\u30a4\u30f3\u3092\u3001\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u306eDNS\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u8ffd\u52a0\u3057\u307e\u3059\u3002\u8a2d\u5b9a\u5f8c\u306f\u3001MXToolbox\u306a\u3069\u306e\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067SPF\u30ec\u30b3\u30fc\u30c9\u304c\u6b63\u3057\u304f\u6a5f\u80fd\u3057\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<\/div>\n<h3>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u3068\u30d8\u30c3\u30c0From\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u5927\u304d\u304f\u4e56\u96e2\u3055\u305b\u3066\u3044\u308b<\/h3>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306b <code>bounce@mailservice.net<\/code>\u3001\u30d8\u30c3\u30c0From\u306b <code>info@mycompany.co.jp<\/code> \u306e\u3088\u3046\u306b\u3001\u30c9\u30e1\u30a4\u30f3\u304c\u5927\u304d\u304f\u7570\u306a\u308b\u8a2d\u5b9a\u306b\u3057\u3066\u3044\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u72b6\u614b\u3067\u306fDMARC\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30c1\u30a7\u30c3\u30af\u3067\u4e0d\u4e00\u81f4\u3068\u5224\u65ad\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u7279\u306b\u53d7\u4fe1\u5074\u304cDMARC\u30dd\u30ea\u30b7\u30fc\u3067 <code>reject<\/code> \u3084 <code>quarantine<\/code> \u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u304f\u306a\u308b\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<div class=\"box01\"><span class=\"box-title\">\u5bfe\u51e6\u6cd5<\/span>\n<ul>\n<li>\u53ef\u80fd\u3067\u3042\u308c\u3070\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u30d8\u30c3\u30c0From\u306e\u30c9\u30e1\u30a4\u30f3\u3068\u540c\u3058\u304b\u3001\u540c\u4e00\u306e\u7d44\u7e54\u304c\u7ba1\u7406\u3059\u308b\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\uff08\u4f8b\uff1abounce.mycompany.co.jp\uff09\u306b\u7d71\u4e00\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div>\n<h2>Gmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u5bfe\u5fdc\u3068\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u95a2\u4fc2<\/h2>\n<p>2024\u5e742\u6708\u306eGmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u6539\u5b9a\u306b\u3088\u308a\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u9069\u5207\u306a\u7ba1\u7406\u306f\u3059\u3079\u3066\u306e\u5927\u91cf\u9001\u4fe1\u8005\u306b\u3068\u3063\u3066\u5fc5\u9808\u8981\u4ef6\u3068\u306a\u308a\u307e\u3057\u305f\u3002\u5bfe\u5fdc\u304c\u4e0d\u5341\u5206\u306a\u307e\u307e\u3067\u306f\u3001\u5230\u9054\u7387\u306b\u76f4\u63a5\u5f71\u97ff\u3057\u307e\u3059\u30022024\u5e742\u6708\u4ee5\u964d\u3001Google\u306f\u5927\u91cf\u30e1\u30fc\u30eb\u9001\u4fe1\u8005\uff081\u65e5\u3042\u305f\u308a5,000\u4ef6\u4ee5\u4e0a\u9001\u4fe1\u3059\u308b\u5834\u5408\uff09\u306b\u5bfe\u3057\u3066SPF\u30fbDKIM\u30fbDMARC\u306e\u8a2d\u5b9a\u3092\u7fa9\u52d9\u5316\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u7ba1\u7406\u3068\u76f4\u63a5\u95a2\u4fc2\u3059\u308b\u91cd\u8981\u306a\u5909\u66f4\u3067\u3059\u3002<\/p>\n<h3>Gmail\u304c\u6c42\u3081\u308b\u9001\u4fe1\u8005\u8981\u4ef6\u3068\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From<\/h3>\n<p>Google\u304c\u5b9a\u3081\u305f\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u8a2d\u5b9a\u304c\u5fc5\u9808\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li><strong>SPF\u8a8d\u8a3c<\/strong>\uff1a\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u3001\u9001\u4fe1\u5143IP\u3092\u8a8d\u8a3c\u3059\u308b\u3053\u3068<\/li>\n<li><strong>DKIM\u8a8d\u8a3c<\/strong>\uff1a\u30e1\u30fc\u30eb\u306b\u96fb\u5b50\u7f72\u540d\u3092\u4ed8\u4e0e\u3057\u3001\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u306e\u6b63\u5f53\u6027\u3092\u8a3c\u660e\u3059\u308b\u3053\u3068<\/li>\n<li><strong>DMARC\u8a8d\u8a3c<\/strong>\uff1aSPF\u307e\u305f\u306fDKIM\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\uff08\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u30d8\u30c3\u30c0From\u306e\u30c9\u30e1\u30a4\u30f3\u4e00\u81f4\u78ba\u8a8d\uff09\u3092\u901a\u904e\u3059\u308b\u3053\u3068<\/li>\n<\/ul>\n<\/div>\n<p>\u7279\u306b\u91cd\u8981\u306a\u306e\u304cSPF\u3068DMARC\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3059\u3002SPF\u8a8d\u8a3c\u306f\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u884c\u308f\u308c\u308b\u305f\u3081\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u3001SPF\u3092\u901a\u904e\u3057\u3066\u3082DMARC\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3067\u5931\u6557\u3059\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>Gmail\u3067\u306e\u30b9\u30d1\u30e0\u7387\u3068\u5230\u9054\u7387\u3078\u306e\u5f71\u97ff<\/h3>\n<p>Google\u306fPostmaster Tools\u3092\u901a\u3058\u3066\u3001\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u306e\u30b9\u30d1\u30e0\u7387\u30fb\u8a8d\u8a3c\u72b6\u6cc1\u30fb\u914d\u4fe1\u30a8\u30e9\u30fc\u7387\u3092\u53ef\u8996\u5316\u3057\u3066\u3044\u307e\u3059\u3002\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u8a8d\u8a3c\u3092Pass\uff08\u5408\u683c\uff09\u3057\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u306f\u3001Gmail\u306e\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u4fe1\u983c\u6027\uff08\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\uff09\u304c\u5411\u4e0a\u3057\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u3078\u306e\u5230\u9054\u7387\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n<p>\u9006\u306b\u3001SPF\u8a8d\u8a3c\u306e\u5931\u6557\u304c\u7d9a\u304f\u30c9\u30e1\u30a4\u30f3\u306f\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u4f4e\u4e0b\u3057\u3001\u5c06\u6765\u7684\u306b\u306f\u307b\u307c\u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u304c\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u3078\u632f\u308a\u5206\u3051\u3089\u308c\u308b\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002\u5b9a\u671f\u7684\u306bPostmaster Tools\u3067\u8a8d\u8a3c\u72b6\u6cc1\u3092\u78ba\u8a8d\u3057\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u8a2d\u5b9a\u304c\u6b63\u3057\u304f\u6a5f\u80fd\u3057\u3066\u3044\u308b\u304b\u3092\u76e3\u8996\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u3068\u306e\u9055\u3044\u3082\u7406\u89e3\u3057\u3066\u304a\u304f<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u30bb\u30c3\u30c8\u3067\u767b\u5834\u3059\u308b\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u3082\u3001\u6b63\u78ba\u306b\u7406\u89e3\u3057\u3066\u304a\u304d\u305f\u3044\u6982\u5ff5\u3067\u3059\u30022\u3064\u306e\u9055\u3044\u3092\u628a\u63e1\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u5168\u4f53\u306e\u4ed5\u7d44\u307f\u304c\u3088\u308a\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u5bfe\u306b\u306a\u308b\u6982\u5ff5\u3068\u3057\u3066\u3001<strong>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To<\/strong>\u3082\u7406\u89e3\u3057\u3066\u304a\u304f\u3068\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u5168\u4f53\u50cf\u304c\u3088\u308a\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u3068\u306f<\/h3>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u306f\u3001SMTP\u306e\u300cRCPT TO:\u300d\u30b3\u30de\u30f3\u30c9\u3067\u6307\u5b9a\u3055\u308c\u308b\u5b9f\u969b\u306e\u914d\u9001\u5148\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u90f5\u4fbf\u306e\u5c01\u7b52\u306b\u66f8\u304f\u300c\u5b9b\u5148\u300d\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002\u53d7\u4fe1\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306f\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u306e\u30a2\u30c9\u30ec\u30b9\u5b9b\u306b\u30e1\u30fc\u30eb\u3092\u914d\u9001\u3057\u3001\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3084\u53d7\u4fe1\u62d2\u5426\u306e\u8a2d\u5b9a\u304c\u3042\u308b\u5834\u5408\u306b\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3078\u306e\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u304c\u8fd4\u9001\u3055\u308c\u307e\u3059\u3002<\/p>\n<div class=\"su-table su-table-alternate\">\n<table>\n<thead>\n<tr>\n<th>\u6bd4\u8f03\u9805\u76ee<\/th>\n<th>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From<\/th>\n<th>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>SMTP\u30b3\u30de\u30f3\u30c9<\/td>\n<td>MAIL FROM:<\/td>\n<td>RCPT TO:<\/td>\n<\/tr>\n<tr>\n<td>\u5f79\u5272<\/td>\n<td>\u5dee\u51fa\u4eba\uff08\u30a8\u30e9\u30fc\u8fd4\u9001\u5148\uff09<\/td>\n<td>\u5b9f\u969b\u306e\u914d\u9001\u5148<\/td>\n<\/tr>\n<tr>\n<td>\u30d8\u30c3\u30c0\u5bfe\u5fdc<\/td>\n<td>Return-Path<\/td>\n<td>Delivered-To<\/td>\n<\/tr>\n<tr>\n<td>\u53d7\u4fe1\u8005\u3078\u306e\u8868\u793a<\/td>\n<td>\u901a\u5e38\u975e\u8868\u793a<\/td>\n<td>\u901a\u5e38\u975e\u8868\u793a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u3068\u30d8\u30c3\u30c0To\u306e\u9055\u3044<\/h3>\n<p>\u30d8\u30c3\u30c0To\uff08\u30e1\u30fc\u30e9\u30fc\u306b\u8868\u793a\u3055\u308c\u308b\u300c\u5b9b\u5148\u300d\uff09\u3068\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u306f\u5225\u306e\u60c5\u5831\u3067\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30e1\u30eb\u30de\u30ac\u3092\u30ea\u30b9\u30c8\u306b\u4e00\u6589\u914d\u4fe1\u3059\u308b\u5834\u5408\u3001\u5404\u53d7\u4fe1\u8005\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7To\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u30d8\u30c3\u30c0To\u306b\u306f\u300cundisclosed-recipients:\u300d\u3068\u8a18\u8f09\u3059\u308b\u306a\u3069\u3001\u500b\u5225\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u975e\u8868\u793a\u306b\u3059\u308b\u30b1\u30fc\u30b9\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u53d7\u4fe1\u8005\u306b\u4ed6\u306e\u53d7\u4fe1\u8005\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u898b\u3048\u306a\u3044\u3088\u3046\u4fdd\u8b77\u3057\u3066\u3044\u307e\u3059\u3002Bcc\u3067\u9001\u4fe1\u3059\u308b\u5834\u5408\u3082\u540c\u69d8\u306e\u4ed5\u7d44\u307f\u3067\u52d5\u4f5c\u3057\u3066\u304a\u308a\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u3068\u30d8\u30c3\u30c0\u306e\u5206\u96e2\u304c\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u4fdd\u8b77\u306e\u57fa\u76e4\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3092\u6b63\u3057\u304f\u7ba1\u7406\u3059\u308b\u306a\u3089\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u6d3b\u7528\u3059\u308b<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u8a2d\u5b9a\u3084\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306e\u7ba1\u7406\u3092\u624b\u52d5\u3067\u884c\u3046\u306e\u306f\u3001\u5927\u91cf\u914d\u4fe1\u306b\u306a\u308b\u307b\u3069\u73fe\u5b9f\u7684\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u6d3b\u7528\u3059\u308c\u3070\u3001\u3053\u308c\u3089\u3092\u307e\u3068\u3081\u3066\u81ea\u52d5\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u306e\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u7ba1\u7406\u3084\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u51e6\u7406\u3092\u624b\u52d5\u3067\u884c\u3046\u306e\u306f\u3001\u7279\u306b\u5927\u91cf\u914d\u4fe1\u3092\u884c\u3046\u4f01\u696d\u306b\u3068\u3063\u3066\u73fe\u5b9f\u7684\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u9069\u5207\u306a\u8a2d\u5b9a\u3001\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306e\u81ea\u52d5\u53ce\u96c6\u3068\u5206\u6790\u3001SPF\u8a8d\u8a3c\u306e\u7ba1\u7406\u307e\u3067\u3001\u5305\u62ec\u7684\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u306e\u6d3b\u7528\u304c\u52b9\u679c\u7684\u3067\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/h3>\n<p>\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u7ba1\u7406\u306b\u3068\u3069\u307e\u3089\u305a\u3001\u6b21\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li><strong>\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306e\u81ea\u52d5\u51e6\u7406<\/strong>\uff1a\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\u3092\u81ea\u52d5\u3067\u53ce\u96c6\u30fb\u5206\u985e\u3057\u3001\u914d\u4fe1\u30ea\u30b9\u30c8\u3092\u5e38\u306b\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3066\u308b<\/li>\n<li><strong>SPF\/DKIM\u8a2d\u5b9a\u306e\u30b5\u30dd\u30fc\u30c8<\/strong>\uff1a\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306e\u8a2d\u5b9a\u3092\u30b7\u30b9\u30c6\u30e0\u5074\u3067\u30b5\u30dd\u30fc\u30c8\u3057\u3001\u5230\u9054\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b<\/li>\n<li><strong>\u52b9\u679c\u6e2c\u5b9a\u306e\u4e00\u5143\u7ba1\u7406<\/strong>\uff1a\u958b\u5c01\u7387\u30fb\u30af\u30ea\u30c3\u30af\u7387\u30fb\u30a8\u30e9\u30fc\u30ab\u30a6\u30f3\u30c8\u3092\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u3067\u78ba\u8a8d\u3067\u304d\u3001PDCA\u304c\u56de\u3057\u3084\u3059\u304f\u306a\u308b<\/li>\n<\/ul>\n<\/div>\n<p>\u9069\u5207\u306a\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u7ba1\u7406\u3068\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u306b\u3088\u308a\u3001\u30e1\u30fc\u30eb\u306e\u5230\u9054\u7387\u3092\u5927\u304d\u304f\u6539\u5584\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u304a\u3059\u3059\u3081\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u300cblastengine\u300d<\/h3>\n<p><a href=\"https:\/\/blastengine.jp\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2025\/10\/blastengine.jpg\" alt=\"blastengine\u306e\u30a2\u30a4\u30ad\u30e3\u30c3\u30c1\u753b\u50cf\" width=\"1303\" height=\"590\" class=\"alignnone wp-image-19575 size-full\" \/><\/a><\/p>\n<p>blastengine\uff08\u30d6\u30e9\u30b9\u30c8\u30a8\u30f3\u30b8\u30f3\uff09\u306f\u3001\u304a\u5ba2\u69d8\u306e\u30b7\u30b9\u30c6\u30e0\u3068SMTP\u30ea\u30ec\u30fc\u3084API\u3067\u9023\u643a\u3059\u308b\u3053\u3068\u3067\u3001\u4e00\u6589\u914d\u4fe1\u3084\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3092\u9ad8\u901f\u304b\u3064\u78ba\u5b9f\u306b\u914d\u4fe1\u3067\u304d\u308b\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3067\u3059\u3002\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u7ba1\u7406\u3084\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306e\u81ea\u52d5\u5bfe\u5fdc\u3001SPF\/DKIM\/DMARC\u5bfe\u5fdc\u306a\u3069\u3001\u6280\u8853\u7684\u306a\u8a2d\u5b9a\u3092\u30d6\u30e9\u30b9\u30c8\u30a8\u30f3\u30b8\u30f3\u5074\u3067\u5305\u62ec\u7684\u306b\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li><strong>SPF\/DKIM\/DMARC\u5bfe\u5fdc<\/strong>\uff1a\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\u306b\u6a19\u6e96\u5bfe\u5fdc\u3057\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u306e\u9069\u5207\u306a\u7ba1\u7406\u306b\u3088\u308b\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u3092\u5b9f\u73fe<\/li>\n<li><strong>\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u81ea\u52d5\u5bfe\u5fdc<\/strong>\uff1a\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\u7ba1\u7406\u3092\u81ea\u52d5\u5316\u3057\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u904b\u7528\u8ca0\u8377\u3092\u5927\u5e45\u306b\u524a\u6e1b<\/li>\n<li><strong>API\u9023\u643a\u30fbSMTP\u30ea\u30ec\u30fc<\/strong>\uff1a\u65e2\u5b58\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u7d44\u307f\u8fbc\u307f\u304c\u5bb9\u6613\u3067\u3001\u6700\u77ed\u5f53\u65e5\u304b\u3089\u5229\u7528\u958b\u59cb\u53ef\u80fd<\/li>\n<li><strong>99%\u4ee5\u4e0a\u306e\u9ad8\u3044\u30e1\u30fc\u30eb\u5230\u9054\u7387<\/strong>\uff1a\u56fd\u5185\u30ad\u30e3\u30ea\u30a2\u30fbISP\u3078\u306e\u500b\u5225\u9001\u4fe1\u30ed\u30b8\u30c3\u30af\u3067\u78ba\u5b9f\u306b\u5c4a\u3051\u308b<\/li>\n<\/ul>\n<\/div>\n<p>\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u9762\u5012\u306a\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u696d\u52d9\u304b\u3089\u89e3\u653e\u3057\u3001\u5e38\u306b\u9ad8\u3044IP\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u3067\u5230\u9054\u7387\u3092\u6700\u5927\u5316\u3057\u307e\u3059\u3002\u521d\u671f\u8cbb\u7528\u7121\u6599\u3001\u6708\u984d3,000\u5186\u301c\u3067\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<div class=\"su-button-center\"><a href=\"https:\/\/blastengine.jp\/\" class=\"su-button su-button-style-flat event_bnr\" style=\"color:#FFFFFF;background-color:#c12620;border-color:#9b1f1a;border-radius:5px\" target=\"_self\"><span style=\"color:#FFFFFF;padding:0px 34px;font-size:25px;line-height:50px;border-color:#d46863;border-radius:5px;text-shadow:none\"> blastengine\u3092\u7121\u6599\u3067\u8a66\u3059 &gt;<\/span><\/a><\/div>\n<p>\u30d6\u30e9\u30b9\u30c8\u30a8\u30f3\u30b8\u30f3\u516c\u5f0f\u30b5\u30a4\u30c8\uff1a<a href=\"https:\/\/blastengine.jp\/\" target=\"_blank\" rel=\"noopener\">https:\/\/blastengine.jp\/<\/a><\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\u3068\u306f\u3001SMTP\u901a\u4fe1\u306b\u304a\u3044\u3066\u30e1\u30fc\u30eb\u306e\u914d\u9001\u306b\u4f7f\u308f\u308c\u308b\u5dee\u51fa\u4eba\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u53d7\u4fe1\u8005\u306b\u8868\u793a\u3055\u308c\u308b\u30d8\u30c3\u30c0From\u3068\u306f\u7570\u306a\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u9593\u306e\u901a\u4fe1\u3067\u4f7f\u308f\u308c\u308b\u30b7\u30b9\u30c6\u30e0\u4e0a\u306e\u60c5\u5831\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u305f\u4e3b\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n<div 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