{"id":40788,"date":"2023-01-11T17:00:11","date_gmt":"2023-01-11T08:00:11","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=40788&#038;post_type=knowledgebase&#038;preview_id=40788"},"modified":"2025-10-02T04:47:29","modified_gmt":"2025-10-01T19:47:29","slug":"spf-record","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/spf-record\/","title":{"rendered":"SPF\u30ec\u30b3\u30fc\u30c9\u3068\u306f\uff08\u5fb9\u5e95\u89e3\u8aac\uff09"},"content":{"rendered":"<p>SPF\uff08Sender Policy Framework\uff09\u306e\u3088\u3046\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6280\u8853\u306f\u3001\u30b5\u30a4\u30d0\u30fc\u653b\u6483\u3084\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u8513\u5ef6\u3059\u308b\u73fe\u4ee3\u306b\u304a\u3044\u3066\u8cb4\u91cd\u306a\u5b58\u5728\u3067\u3059\u3002<\/p>\n<p>\u30b5\u30a4\u30d0\u30fc\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306f\u3001\u500b\u4eba\u3001\u4f01\u696d\u3001\u305d\u3057\u3066\u653f\u5e9c\u6a5f\u95a2\u306b\u81f3\u308b\u307e\u3067\u3001\u3059\u3079\u3066\u306e\u4eba\u306b\u3068\u3063\u3066\u306e\u8ab2\u984c\u3002\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u306a\u3069\u3001\u30c7\u30fc\u30bf\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001\u500b\u4eba\u3092\u72d9\u3063\u305f\u60aa\u8cea\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u304c\u6a2a\u884c\u3057\u3066\u3044\u308b\u306e\u304c\u73fe\u5b9f\u3067\u3059\u3002<\/p>\n<p>\u30b5\u30a4\u30c8\u6240\u6709\u8005\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u5371\u967a\u306b\u6652\u3055\u308c\u308c\u3070\u3001\u30c7\u30fc\u30bf\u3084\u8cc7\u91d1\u3001\u8a55\u5224\u3001\u9867\u5ba2\u306e\u4fe1\u983c\u306a\u3069\u3092\u5931\u3044\u304b\u306d\u307e\u305b\u3093\u3002\u96fb\u5b50\u30e1\u30fc\u30eb\u306f\u3001\u6700\u3082\u4f7f\u7528\u3055\u308c\u308b\u653b\u6483\u7d4c\u8def\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n<p>SPF\u306f\u3001\u5e83\u304f\u666e\u53ca\u3057\u3066\u3044\u308b<a href=\"https:\/\/kinsta.com\/jp\/blog\/email-authentication\/\">\u30e1\u30fc\u30eb\u8a8d\u8a3c<\/a>\u6280\u8853\u3067\u3001\u30e1\u30fc\u30eb\u306e\u6539\u3056\u3093\u3092\u691c\u51fa\u3057\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u307e\u305f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u9867\u5ba2\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u969b\u3001\u53d7\u4fe1\u8005\u5074\u306e\u30b5\u30fc\u30d0\u30fc\u3067\u8ff7\u60d1\u30e1\u30fc\u30eb\u3068\u5224\u5b9a\u3055\u308c\u308b\u306e\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u3001\u305d\u3057\u3066\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/secure-email-providers\/\">\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a>\u3092\u5f37\u5316\u3059\u308b\u305f\u3081\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u5c0e\u5165\u304c\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u7406\u7531\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc><\/p>\n<h2>SPF\u3068\u306f<\/h2>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u3054\u8aac\u660e\u3059\u308b\u524d\u306b\u3001\u307e\u305a\u306fSPF\u306e\u3053\u3068\u304b\u3089\u3002<\/p>\n<p>SPF\uff08Sender Policy Framework\uff09\u3068\u306f\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u306e\u507d\u9020\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u958b\u767a\u3055\u308c\u305f\u30e1\u30fc\u30eb\u8a8d\u8a3c\u6280\u8853\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_128283\" aria-describedby=\"caption-attachment-128283\" style=\"width: 1000px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128283 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/spfrecord-1.png\" alt=\"SPF\u306e\u4ed5\u7d44\u307f\uff08\u753b\u50cf\u51fa\u5178: DMRC\uff09\" width=\"1000\" height=\"400\"><figcaption id=\"caption-attachment-128283\" class=\"wp-caption-text\">SPF\u306e\u4ed5\u7d44\u307f\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/dmarcian.com\/what-is-spf\/\" target=\"_blank\" rel=\"noopener noreferrer\">DMRC<\/a>\uff09<\/figcaption><\/figure>\n<p><a href=\"https:\/\/kinsta.com\/blog\/ip-spoofing\/\">\u653b\u6483\u8005\u306f\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3092\u507d\u9020<\/a>\u3057\u3001\u3042\u305f\u304b\u3082\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u306e\u30a2\u30c9\u30ec\u30b9\u306e\u3088\u3046\u306b\u898b\u305b\u304b\u3051\u307e\u3059\u3002SPF\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u691c\u51fa\u3057\u3066\u6392\u9664\u3057\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u30e1\u30fc\u30eb\u3092\u5229\u7528\u3057\u305f\u30b5\u30a4\u30d0\u30fc\u653b\u6483\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>SPF\u306f\u3001\u53d7\u4fe1\u5074\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306f\u4e00\u898b\u3059\u308b\u3068\u6b63\u5f53\u306a\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u9001\u4fe1\u3055\u308c\u305f\u30e1\u30fc\u30eb\u304c\u3001\u672c\u5f53\u306b\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u9001\u4fe1\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u691c\u8a3c\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u3068\u30b5\u30fc\u30d0\u30fc\u306e\u60c5\u5831\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-dns\/\">DNS\u30ec\u30b3\u30fc\u30c9<\/a>\u3067\u53c2\u7167\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u3068\u306f<\/h2>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001DNS\u306e\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u52a0\u3055\u308c\u308b<a href=\"https:\/\/kinsta.com\/jp\/docs\/wordpress-hosting\/wordpress-domains\/dns\/#how-to-add-an-spf-record-for-mailchannels\">TXT\u30ec\u30b3\u30fc\u30c9<\/a>\u306e\u4e00\u7a2e\u3002\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306b\u306f\u3001\u5dee\u51fa\u4eba\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3059\u3079\u3066\u306e\u6b63\u898f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u60c5\u5831\u304c\u542b\u307e\u308c\u307e\u3059\u3002SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/dns-propagation\/\">DNS\u306b\u8ffd\u52a0<\/a>\u3059\u308b\u3053\u3068\u3067\u5b9f\u88c5\u3067\u304d\u3001\u30b9\u30d1\u30e0\u696d\u8005\u306b\u3088\u3063\u3066\u30a2\u30c9\u30ec\u30b9\u304c\u507d\u9020\u3055\u308c\u305f\u30e1\u30fc\u30eb\u3092\u691c\u51fa\u3057\u3001\u9001\u4fe1\u3092\u963b\u6b62\u3057\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_128284\" aria-describedby=\"caption-attachment-128284\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128284 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/SPF-Record-1.png\" alt=\"SPF\u30ec\u30b3\u30fc\u30c9\u306e\u4ed5\u7d44\u307f\uff08\u753b\u50cf\u51fa\u5178: Pair\uff09\" width=\"900\" height=\"498\"><figcaption id=\"caption-attachment-128284\" class=\"wp-caption-text\">SPF\u30ec\u30b3\u30fc\u30c9\u306e\u4ed5\u7d44\u307f\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/www.pair.com\/support\/kb\/what-is-an-spf\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pair<\/a>\uff09<\/figcaption><\/figure>\n<p>\u8ff7\u60d1\u30e1\u30fc\u30eb\u3092\u914d\u4fe1\u3059\u308b\u653b\u6483\u8005\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067\u8a8d\u8a3c\u3055\u308c\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/email-header\/\">\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc<\/a>\u3092\u6539\u3056\u3093\u3057\u3066\u5dee\u51fa\u4eba\u60c5\u5831\u3092\u5909\u66f4\u3057\u3001\u3042\u305f\u304b\u3082\u5b89\u5168\u306a\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u5c4a\u3044\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u308b\u30e1\u30fc\u30eb\u3092\u914d\u4fe1\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u884c\u70ba\u306f\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3068\u547c\u3070\u308c\u3001\u30b9\u30d1\u30e0\u696d\u8005\u3084\u653b\u6483\u8005\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u3092\u9a19\u3057\u3066\u500b\u4eba\u60c5\u5831\u3092\u5165\u624b\u3059\u308b\u3053\u3068\u3067\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u3059\u308b\u500b\u4eba\u3084\u7d44\u7e54\u306b\u640d\u5bb3\u3092\u4e0e\u3048\u307e\u3059\u3002<\/p>\n<p>\u4eca\u65e5\u3001\u307b\u307c\u3059\u3079\u3066\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u306b\u306f\u3001\u507d\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u653b\u6483\u8005\u306b\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u76d7\u7528\u3055\u308c\u305f\u500b\u4eba\u3084\u7d44\u7e54\u306f\u3001\u9867\u5ba2\u304b\u3089\u306e\u4fe1\u7528\u3092\u5931\u3063\u305f\u308a\u3001\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\uff08\u914d\u4fe1\u3067\u304d\u306a\u304b\u3063\u305f\u30e1\u30fc\u30eb\uff09\u306e\u518d\u9001\u306b\u4f59\u8a08\u306a\u6642\u9593\u3092\u8cbb\u3084\u3057\u305f\u308a\u3001\u81ea\u793e\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u306b\u767b\u9332\u3055\u308c\u3066\u3057\u307e\u3063\u305f\u308a\u306a\u3069\u306e\u88ab\u5bb3\u3092\u53d7\u3051\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<a href=\"https:\/\/kinsta.com\/blog\/email-deliverability-manager\/\">\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u6027<\/a>\u3068\u5b89\u5168\u6027\u3092\u9ad8\u3081\u308b\u306b\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<h3>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u66f8\u304d\u65b9<\/h3>\n<p>\u4e00\u822c\u7684\u306b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306fTXT\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff08\u5f93\u6765\u306e\u30d5\u30a1\u30a4\u30eb\u30bf\u30a4\u30d7\u3068\u306e\u6df7\u540c\u3092\u907f\u3051\u308b\u305f\u3081\uff09\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u4f7f\u7528\u3059\u308bSPF\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u793a\u3059\u300cv\u300d\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u73fe\u5728\u306f\u3001\u6700\u3082\u591a\u304f\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067\u8a8d\u8b58\u3055\u308c\u308b\u300cspf1\u300d\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u5f8c\u306f\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u95a2\u3059\u308b\u60c5\u5831\u3092\u5b9a\u7fa9\u3059\u308b\u7528\u8a9e\u304c\u7d9a\u304d\u307e\u3059\u3002\u3053\u306e\u7528\u8a9e\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u51e6\u7406\u306b\u3064\u3044\u3066\u306e\u8a73\u7d30\u60c5\u5831\u3092\u542b\u3080\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a18\u8ff0\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a18\u8ff0\u4f8b\u3067\u3059\u3002<\/p>\n<pre>&lt;v=\"spf1 a include:_spf.google.com -all\"&gt;\n<\/pre>\n<ul>\n<li><code>v=spf1<\/code>\uff1aSPF\u306e\u30d0\u30fc\u30b8\u30e7\u30f31\u3001TXT\u30ec\u30b3\u30fc\u30c9\u3092SPF\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u8b58\u5225\u3059\u308b\u8981\u7d20<\/li>\n<li><code>a<\/code>\uff1a\u30c9\u30e1\u30a4\u30f3\u306eA\u30ec\u30b3\u30fc\u30c9\u3067\u7279\u5b9a\u3055\u308c\u305f\u30b5\u30fc\u30d0\u30fc\u304c\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u3092\u8a31\u53ef\u3059\u308b\u3082\u306e<\/li>\n<li><code>include:<\/code>\uff1a\u9001\u4fe1\u8005\u304c\u30c9\u30e1\u30a4\u30f3\uff08\u4e0a\u306e\u4f8b\u3067\u306fgoogle.com\uff09\u306b\u4ee3\u308f\u3063\u3066\u9001\u4fe1\u3059\u308b\u30e1\u30fc\u30eb\u306e\u8a8d\u8a3c\u306b\u4f7f\u7528<\/li>\n<li><code>-all<\/code>\uff1aSPF\u30ec\u30b3\u30fc\u30c9\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u8a31\u53ef\u3057\u306a\u3044\u65e8\u3092\u53d7\u4fe1\u5074\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u4f1d\u3048\u308b\u3082\u306e\uff08\u307e\u305f\u305d\u306e\u3088\u3046\u306a\u30a2\u30c9\u30ec\u30b9\u3092\u62d2\u5426\u3059\u308b\u3088\u3046\u306b\u6307\u793a\uff09<\/li>\n<\/ul>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u4ed5\u7d44\u307f<\/h2>\n<p><a href=\"https:\/\/kinsta.com\/jp\/blog\/smtp-port\/\">SMTP<\/a>\u3067\u8a31\u53ef\u3055\u308c\u305f\u30a2\u30c9\u30ec\u30b9\u304c\u5dee\u51fa\u4eba\u306e\u30e1\u30fc\u30eb\u306f\u3001\u3069\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u304b\u3089\u3067\u3082\u9001\u4fe1\u53ef\u80fd\u3067\u3059\u3002\u653b\u6483\u8005\u3084\u8a50\u6b3a\u5e2b\u306f\u3001\u8ffd\u8de1\u56f0\u96e3\u306a\u507d\u9020\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3063\u3066\u3001\u3053\u306e\u4ed5\u7d44\u307f\u3092\u60aa\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u306b\u3082\u540c\u69d8\u306e\u624b\u6cd5\u304c\u4f7f\u308f\u308c\u3066\u304a\u308a\u3001\u653b\u6483\u8005\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u3088\u304f\u5229\u7528\u3059\u308b\u30b5\u30a4\u30c8\u3084\u30b5\u30fc\u30d3\u30b9\u3092\u6a21\u5023\u3057\u3066\u3001\u500b\u4eba\u60c5\u5831\u3084\u4f01\u696d\u60c5\u5831\u306e\u5165\u624b\u3092\u8a66\u307f\u307e\u3059\u3002<\/p>\n<p>SPF\u3092\u5c0e\u5165\u3059\u308b\u3068\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u6240\u6709\u8005\u304cDNS\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u6a29\u9650\u3092\u6301\u3064\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u3053\u308c\u306b\u5bfe\u6297\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u53d7\u4fe1\u8005\u306f\u3001\u4e0d\u6b63\u306a\u9001\u4fe1\u5143\u304b\u3089\u306e\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3059\u308b\u524d\u306b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u691c\u8a3c\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30e1\u30fc\u30eb\u306e\u53d7\u4fe1\u3092\u62d2\u5426\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5148\u307b\u3069\u306e\u4f8b\u3067\u898b\u305f\u3088\u3046\u306b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u6b63\u898f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3057\u305fTXT\u30ec\u30b3\u30fc\u30c9\u5f62\u5f0f\u3067\u3059\u3002SPF\u30ec\u30b3\u30fc\u30c9\u306b\u306f\u30011\u3064\u307e\u305f\u306f\u8907\u6570\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u884c\u3046\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_128285\" aria-describedby=\"caption-attachment-128285\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128285 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/SPF-Record-Works-1-1.jpg\" alt=\"SPF\u306e\u4ed5\u7d44\u307f\uff08\u753b\u50cf\u51fa\u5178: CyberPunk\uff09\" width=\"900\" height=\"428\"><figcaption id=\"caption-attachment-128285\" class=\"wp-caption-text\">SPF\u306e\u4ed5\u7d44\u307f\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/www.cyberpunk.rs\/spf-email-validation-protocol\" target=\"_blank\" rel=\"noopener noreferrer\">CyberPunk<\/a>\uff09<\/figcaption><\/figure>\n<p>\u6b63\u898f\u30e6\u30fc\u30b6\u30fc\u304cSPF\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u3068\u3001\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067DNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u305d\u308c\u304b\u3089\u3001TXT\u30ec\u30b3\u30fc\u30c9\u3092\u691c\u51fa\u3057\u3001\u9001\u4fe1\u8005\u306e<a href=\"https:\/\/kinsta.com\/blog\/static-vs-dynamic-ip\/\">IP\u30a2\u30c9\u30ec\u30b9<\/a>\u306b\u507d\u9020\u304c\u306a\u3044\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30a2\u30c9\u30ec\u30b9\u3068\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u9001\u4fe1\u8005\u306b\u300chard fail\u300d\u307e\u305f\u306f\u300csoft fail\u300d\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u53d7\u4fe1\u5074\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u62d2\u5426\u3059\u308b\u3068\u3001\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u307e\u305f\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u3001\u8a8d\u8a3c\u5931\u6557\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u9001\u4fe1\u3055\u308c\u307e\u3059\uff08hard fail\uff09\u3002\u307e\u305f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30e1\u30fc\u30eb\u8ee2\u9001\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\uff08MTA\uff09\u3060\u3063\u305f\u5834\u5408\u306b\u306f\u3001\u5b9f\u969b\u306e\u5dee\u51fa\u4eba\u30a2\u30c9\u30ec\u30b9\u306b\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u3055\u308c\u307e\u3059\uff08soft fail\uff09\u3002<\/p>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u69cb\u6210\u8981\u7d20<\/h2>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u3092\u7b46\u982d\u306b\u8907\u6570\u306e\u8981\u7d20\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7<\/h3>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u3067\u59cb\u307e\u308a\u307e\u3059\u3002\u3053\u306e\u756a\u53f7\u306f\u3001\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u3092\u5b9a\u7fa9\u3059\u308b\u6a5f\u69cb\u3088\u3063\u3066\u8a8d\u8a3c\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\uff08spf1\u306a\u3069\uff09\u306e\u5f8c\u306b\u306f\u3001\u6a5f\u69cb\u3001\u9650\u5b9a\u5b50\u3001\u4fee\u98fe\u5b50\u306e\u6587\u5b57\u5217\u304c\u7d9a\u304d\u307e\u3059\u3002<\/p>\n<h3>\u6a5f\u69cb\uff08mechanism\uff09<\/h3>\n<p>\u6a5f\u69cb\u306b\u306f\u3001\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3057\u3066\u8a8d\u8a3c\u3055\u308c\u305f\u9001\u4fe1\u5143\u30b5\u30fc\u30d0\u30fc\u306e\u60c5\u5831\u304c\u542b\u307e\u308c\u3001\u30bc\u30ed\u307e\u305f\u306f\u8907\u6570\u306e\u6a5f\u69cb\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u3082\u306e\u306b\u306f\u3001\u4ee5\u4e0b\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong><code>a<\/code><\/strong>\uff1aDNS\u306eA\u30ec\u30b3\u30fc\u30c9\u306b\u542b\u307e\u308c\u308b\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u5b9a\uff08\u4f8b: <code>v=spf1 a:google.com -all<\/code>\uff09\u3002\u6700\u5f8c\u306b\u4f7f\u7528\u3055\u308c\u3001\u4e8b\u524d\u306e\u6a5f\u69cb\u306b\u4e00\u81f4\u3057\u306a\u3044\u9001\u4fe1\u8005IP\u3092\u51e6\u7406\u3059\u308b\u30eb\u30fc\u30eb\u3092\u5b9a\u7fa9\u3002<\/li>\n<li><strong><code>mx<\/code><\/strong>\uff1a\u5404\u30b5\u30fc\u30d0\u30fc\u306b\u5c5e\u3059\u308bMX\u30ec\u30b3\u30fc\u30c9\u306b\u7d10\u4ed8\u304f\u3059\u3079\u3066\u306eA\u30ec\u30b3\u30fc\u30c9\u3092\u5b9a\u7fa9\uff08\u4f8b: <code>v=spf1 mx mx:google.com -all<\/code>\uff09\u3002<\/li>\n<li><strong><code>include:<\/code><\/strong>\uff1a\u4ed6\u306e\u8a8d\u8a3c\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u3092\u5b9a\u7fa9\uff08\u4f8b: <code>v=spf1 include:outlook.microsoft.com -all<\/code>\uff09\u3002\u5b9a\u7fa9\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3059\u308c\u3070\u3001SPF\u304c\u901a\u904e\u3059\u308b\u3002\u4ed6\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u30e1\u30fc\u30eb\u9001\u4fe1\u306e\u6a29\u9650\u3092\u59d4\u4efb\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u3001redirect\u3092\u4f7f\u3063\u3066\u62e1\u5f35\u304c\u5fc5\u8981\u3002<\/li>\n<li><strong><code>ptr<\/code><\/strong>\uff1a\u5404\u30b5\u30fc\u30d0\u30fc\u306ePTR\u30ec\u30b3\u30fc\u30c9\u306b\u6307\u5b9a\u3057\u305fA\u30ec\u30b3\u30fc\u30c9\u3092\u5b9a\u7fa9\uff08\u4f8b: <code>v=spf1 ptr:domain.com -all<\/code>\uff09\u3002\u57fa\u672c\u7684\u306b\u306f\u975e\u63a8\u5968\u3002<\/li>\n<li><strong><code>all<\/code><\/strong>\uff1a\u30ea\u30e2\u30fc\u30c8\u3068\u30ed\u30fc\u30ab\u30eb\u306e\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068\u4e00\u81f4\u3057\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u672b\u5c3e\u3067\u4f7f\u7528\uff08\u4f8b: <code>v=spf1 +all<\/code>\uff09\u3002<\/li>\n<li><strong><code>exists<\/code><\/strong>\uff1aSPF\u306e\u5b9a\u7fa9\u306b\u57fa\u3065\u304d\u3001\u4f8b\u5916\u3068\u3057\u3066\u30b5\u30a4\u30f3\u30a2\u30a6\u30c8\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u3092\u5b9a\u7fa9\u3002\u5b9a\u7fa9\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u3067\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u7d50\u679c\u53d6\u5f97\u6642\u306b\u4e00\u81f4\u3002\u4f7f\u7528\u3059\u308b\u6a5f\u4f1a\u306f\u7a00\u3067\u3001DNSBL\u30af\u30a8\u30ea\u306e\u3088\u3046\u306a\u3088\u308a\u8907\u96d1\u306a\u7167\u5408\u304c\u53ef\u80fd\u3002<\/li>\n<li><strong><code>ip4<\/code><\/strong>\uff1aIPv4\u30a2\u30c9\u30ec\u30b9\u306e\u5b9a\u7fa9\u306b\u4f7f\u7528\uff08\u4f8b: v=spf1 ip4:192.0.0.1 -all\uff09\u3002<\/li>\n<li><strong><code>ip6<\/code><\/strong>\uff1aIPv6\u30a2\u30c9\u30ec\u30b9\u306e\u5b9a\u7fa9\u306b\u4f7f\u7528\uff08\u4f8b: v=spf1 ip6:2001:db8::8a2e:370:7334 -all\uff09\u3002<\/li>\n<\/ul>\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306a\u6a5f\u69cb\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u8a31\u53ef\u3055\u308c\u305f\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<h3>\u9650\u5b9a\u5b50<\/h3>\n<p>\u6a5f\u69cb\u306b\u306f\u3001\u7167\u5408\u51e6\u7406\u306e\u65b9\u6cd5\u3092\u5b9a\u7fa9\u3059\u308b\u9650\u5b9a\u5b50\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u9001\u4fe1\u8005\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u6a5f\u69cb\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u3068\u7167\u3089\u3057\u5408\u308f\u305b\u307e\u3059\u3002SPF\u306e\u6a5f\u69cb\u5185\u306b\u4e00\u81f4\u3059\u308bIP\u30a2\u30c9\u30ec\u30b9\u3092\u691c\u51fa\u3057\u305f\u3089\u3001\u7d50\u679c\u51e6\u7406\u306e\u30eb\u30fc\u30eb\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f<code>pass<\/code>\u307e\u305f\u306f<code>+<\/code>\uff09\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n<p>\u9650\u5b9a\u5b50\u306b\u306f\u3001\u4ee5\u4e0b4\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong><code>+<\/code><\/strong>\uff1a\u8a8d\u8a3c\u3055\u308c\u305f\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u300cPASS\u300d\u3092\u8868\u3059\u3002\u30a2\u30c9\u30ec\u30b9\u304c\u8a8d\u8a3c\u3055\u308c\u308b\u3068\u3001\u30e1\u30fc\u30eb\u304c\u53d7\u3051\u5165\u308c\u3089\u308c\u308b\uff08\u4f8b: <code>v=spf1 +all<\/code>\uff09\u3002<code>+mx<\/code>\u3068<code>mx<\/code>\u3068\u540c\u3058\u3082\u306e\u3067\u3042\u308b\u305f\u3081\u7701\u7565\u53ef\u80fd\u3002<\/li>\n<li><strong><code>-<\/code><\/strong>\uff08\u30cf\u30a4\u30d5\u30f3\uff09\uff1a\u300cHARDFAIL\u300d\u3092\u8868\u3059\u3002\u30a2\u30c9\u30ec\u30b9\u306e\u8a8d\u8a3c\u5931\u6557\u3092\u610f\u5473\u3057\u3001\u30e1\u30fc\u30eb\u306f\u62d2\u5426\u3055\u308c\u308b\uff08\u4f8b: <code>v=spf1 -all<\/code>\uff09\u3002<\/li>\n<li><strong><code>~<\/code><\/strong>\uff08\u30c1\u30eb\u30c0\uff09\uff1a\u300cSOFTFAIL\u300d\u3092\u8868\u3059\u3002\u30a2\u30c9\u30ec\u30b9\u306e\u8a8d\u8a3c\u5931\u6557\u3092\u610f\u5473\u3059\u308b\u304c\u3001\u7d50\u679c\u306f\u660e\u78ba\u3067\u306f\u306a\u3044\u3002\u975e\u6e96\u62e0\u306e\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u5165\u308c\u3066\u3001\u30bf\u30b0\u4ed8\u3051\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff08\u4f8b: <code>v=spf1 ~all<\/code>\uff09\u3002<\/li>\n<li><strong><code>?<\/code><\/strong>\uff1a\u300cNEUTRAL\u300d\u3092\u8868\u3059\u3002\u8a8d\u8a3c\u306b\u6210\u529f\u3067\u3082\u5931\u6557\u3067\u3082\u306a\u304f\u3001\u30e1\u30fc\u30eb\u306e\u6271\u3044\u306f\u81ea\u7531\uff08\u4f8b: <code>v=spf1 ?all<\/code>\uff09\u3002<\/li>\n<\/ul>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306b\u9650\u5b9a\u5b50\u304c\u306a\u3044\u5834\u5408\u306f\u3001<code>+all<\/code>\u304c\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\u4fee\u98fe\u5b50<\/h3>\n<p>\u4fee\u98fe\u5b50\u3092\u4f7f\u3046\u3068\u3001\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u62e1\u5f35\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4fee\u98fe\u5b50\u306f<code>=<\/code>\u8a18\u53f7\u3067\u533a\u5207\u3089\u308c\u305f\u5024\u307e\u305f\u306f\u540d\u524d\u306e\u30da\u30a2\u3067\u3001\u3088\u308a\u8a73\u7d30\u306a\u60c5\u5831\u3092\u793a\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u30020\u301c2\u500b\u307e\u3067\u8a18\u8ff0\u53ef\u80fd\u3067\u3001\u30ec\u30b3\u30fc\u30c9\u306e\u6700\u5f8c\u306b\u4e00\u5ea6\u3060\u3051\u793a\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4e3b\u306a\u4fee\u98fe\u5b50\u306f\u4ee5\u4e0b\u306e2\u3064\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong><code>redirect<\/code><\/strong>\uff1a\u4ed6\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u30af\u30a8\u30ea\u3092\u9001\u4fe1\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3002\u4ed6\u306e\u6a5f\u69cb\u3084\u4fee\u98fe\u5b50\u3068\u6bd4\u8f03\u3057\u3066\u6271\u3044\u3084\u3059\u304f\u3001\u8907\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u540c\u3058SPF\u30ec\u30b3\u30fc\u30c9\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306b\u5f79\u7acb\u3064\u3002<\/li>\n<li><strong><code>exp<\/code><\/strong>\uff1a\u4e00\u81f4\u3057\u305f\u6a5f\u69cb\u306bFAIL\u9650\u5b9a\u5b50\u304c\u542b\u307e\u308c\u308b\u969b\u3001\u8aac\u660e\u306e\u8a18\u8ff0\u306b\u4f7f\u7528\u3002\u3053\u306e\u8aac\u660e\u306f\u3001SPF\u30ed\u30b0\u306b\u8a18\u8f09\u3055\u308c\u308b\u3002<\/li>\n<\/ul>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u5fc5\u8981\u6027<\/h2>\n<p>\u30c9\u30e1\u30a4\u30f3\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u3066\u304a\u3051\u3070\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u3092\u53d7\u4fe1\u3059\u308b\u53ef\u80fd\u6027\u304c\u6e1b\u5c11\u3057\u3001\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u5f37\u5316\u3055\u308c\u3001<a href=\"https:\/\/kinsta.com\/blog\/website-security-check\/\">\u30b5\u30a4\u30d0\u30fc\u653b\u6483\u8005\u3084\u8ff7\u60d1\u30e1\u30fc\u30eb\u304b\u3089\u81ea\u793e\u3092\u5b88\u308b<\/a>\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u4fe1\u983c\u6027\u3092\u9ad8\u3081\u3001\u914d\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u304c\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u4e0b\u304c\u308b\u3053\u3068\u3067\u3001\u9867\u5ba2\u306e\u5143\u306b\u30b9\u30e0\u30fc\u30ba\u306b\u30e1\u30fc\u30eb\u3092\u5c4a\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30c9\u30e1\u30a4\u30f3\u3078\u306eSPF\u30ec\u30b3\u30fc\u30c9\u306e\u8ffd\u52a0\u306f\u3001\u3069\u306e\u9001\u4fe1\u8005\u304c\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u304b\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u3001\u8fd1\u5e74\u307e\u3059\u307e\u3059\u91cd\u8981\u8996\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u304b\u3089\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u30e1\u30ea\u30c3\u30c8\u3092\u3054\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5411\u4e0a<\/h3>\n<figure id=\"attachment_128280\" aria-describedby=\"caption-attachment-128280\" style=\"width: 1000px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128280 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/Email-Security.jpg\" alt=\"\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff08\u753b\u50cf\u51fa\u5178: Zero 1 Zero Innovations\uff09\" width=\"1000\" height=\"451\"><figcaption id=\"caption-attachment-128280\" class=\"wp-caption-text\">\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/010innovations.com\/5-steps-to-enhanced-email-security\/\" target=\"_blank\" rel=\"noopener noreferrer\">Zero 1 Zero Innovations<\/a>\uff09<\/figcaption><\/figure>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u500b\u4eba\u30fb\u6cd5\u4eba\u3092\u554f\u308f\u305a\u3001\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u9ad8\u3081\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u4e16\u754c\u4e2d\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u30b5\u30a4\u30d0\u30fc\u72af\u7f6a\u306e\u88ab\u5bb3\u306b\u906d\u3044\u304b\u306d\u306a\u3044\u30b5\u30a4\u30d0\u30fc\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6642\u4ee3\u306b\u306f\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u3092\u81ea\u5206\u3067\u5b88\u308b\u305f\u3081\u306e\u5bfe\u7b56\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u4e00\u5f79\u8cb7\u3046\u306e\u304c\u3001\u307e\u3055\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3067\u3059\u3002\u653b\u6483\u8005\u304c\u4fb5\u5165\u3057\u306b\u304f\u3044\u74b0\u5883\u3092\u4f5c\u308b\u3053\u3068\u3067\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u306e\u53d7\u4fe1\u3092\u9632\u304e\u3001\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u5230\u9054\u7387\u306e\u5411\u4e0a<\/h3>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u306f\u3001\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u304c\u767a\u751f\u3057\u305f\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u3067\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3055\u308c\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u3053\u3068\u304c\u7e70\u308a\u8fd4\u3055\u308c\u308b\u3068\u3001\u9867\u5ba2\u306b\u30e1\u30fc\u30eb\u3092\u9069\u5207\u306b\u6b63\u5e38\u306b\u9001\u4fe1\u3059\u308b\u80fd\u529b\uff08\u914d\u4fe1\u80fd\u529b\u3068\u3082\uff09\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u914d\u4fe1\u80fd\u529b\u306e\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u306f\u3001\u500b\u4eba\u3084\u4f01\u696d\u304c\u30bf\u30fc\u30b2\u30c3\u30c8\u3068\u3059\u308b\u9867\u5ba2\u3001\u5f93\u696d\u54e1\u3001\u8ca9\u58f2\u696d\u8005\u3001\u305d\u306e\u4ed6\u306e\u95a2\u4fc2\u8005\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u969b\u306e\u969c\u5bb3\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\u3092\u9ad8\u3081\u308b<\/h3>\n<figure id=\"attachment_128286\" aria-describedby=\"caption-attachment-128286\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128286 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/Domain-Reputation.jpg\" alt=\"\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\uff08\u753b\u50cf\u51fa\u5178: Rejoiner\uff09\" width=\"900\" height=\"470\"><figcaption id=\"caption-attachment-128286\" class=\"wp-caption-text\">\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/www.rejoiner.com\/resources\/domain-reputation\" target=\"_blank\" rel=\"noopener noreferrer\">Rejoiner<\/a>\uff09<\/figcaption><\/figure>\n<p>\u81ea\u793e\u306e\u9867\u5ba2\u304c\u3001\u983b\u7e41\u306b<a href=\"https:\/\/kinsta.com\/blog\/dns-poisoning\/\">\u81ea\u793e\u3092\u88c5\u3063\u305f\u653b\u6483\u8005<\/a>\u304b\u3089\u306e\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u4fe1\u983c\u6027\u304c\u5371\u967a\u306b\u6652\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u60aa\u8cea\u306a\u696d\u8005\u306b\u3088\u3063\u3066\u3001\u9867\u5ba2\u3084\u5f93\u696d\u54e1\u306e\u500b\u4eba\u60c5\u5831\u304c\u6d41\u51fa\u3057\u3066\u3057\u307e\u3046\u6050\u308c\u3082\u3042\u308a\u3001<a href=\"https:\/\/kinsta.com\/blog\/domain-reputation\/\">\u3055\u3089\u306b\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\u3092\u4e0b\u3052\u3066<\/a>\u3057\u307e\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3092\u5229\u7528\u3057\u3066\u3001\u3053\u306e\u3088\u3046\u306a\u4e8b\u614b\u304b\u3089\u30c9\u30e1\u30a4\u30f3\u3092\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002SPF\u30ec\u30b3\u30fc\u30c9\u3067\u5b9a\u7fa9\u3057\u305f\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u306e\u307f\u306b\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u6a29\u9650\u3092\u4e0e\u3048\u308b\u3053\u3068\u3067\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u3092\u9632\u304e\u3001\u653b\u6483\u306e\u6a19\u7684\u3068\u306a\u308b\u53ef\u80fd\u6027\u3092\u4f4e\u6e1b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>DMARC\u6e96\u62e0<\/h3>\n<p>\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u30b7\u30b9\u30c6\u30e0<a href=\"https:\/\/kinsta.com\/jp\/blog\/dmarc-fail\/\">DMARC<\/a>\u306b\u3088\u3063\u3066\u3001\u8a31\u53ef\u3055\u308c\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u307f\u304c\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u5236\u9650\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30b5\u30fc\u30d0\u30fc\u306bDKIM\u3084SPF\u306e\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u30e1\u30fc\u30eb\u306e\u51e6\u7406\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3082\u6307\u793a\u3092\u51fa\u3057\u3001\u62d2\u5426\u3001\u9694\u96e2\u3001\u4f55\u3082\u3057\u306a\u3044\u306e\u9078\u629e\u80a2\u304b\u3089\u9078\u3076\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30c9\u30e1\u30a4\u30f3\u7ba1\u7406\u8005\u306f\u3001\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u72b6\u6cc1\u306b\u95a2\u3059\u308b\u30ec\u30dd\u30fc\u30c8\u3092\u78ba\u8a8d\u3057\u3001\u8a2d\u5b9a\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u306b\u306a\u308b\u4e8b\u4f8b<\/h2>\n<p>\u9867\u5ba2\u3001\u5f93\u696d\u54e1\u3001\u8ca9\u58f2\u696d\u8005\u306a\u3069\u306b\u5546\u7528\u30fb\u53d6\u5f15\u7528\u306e\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u5834\u5408\u306f\u3001<a href=\"https:\/\/kinsta.com\/blog\/domain-reputation\/\">\u30c9\u30e1\u30a4\u30f3<\/a>\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3059\u308b\u306e\u304c\u8ce2\u660e\u3067\u3059\u3002\u3055\u307e\u3056\u307e\u306a\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u5229\u7528\u3057\u3066\u3001\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u6027\u3068\u5b89\u5168\u6027\u3092\u9ad8\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li><strong>\u500b\u4eba\u30fb\u4f01\u696d<\/strong>\u2500SPF\u30ec\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306a\u30e1\u30fc\u30eb\u8a8d\u8a3c\u6280\u8853\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u304b\u3001\u30a2\u30c9\u30ec\u30b9\u3092\u507d\u9020\u3059\u308b\u7b2c\u4e09\u8005\u3067\u3042\u308b\u304b\u3092\u7279\u5b9a\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3092DMARC\u3084DKIM\u3068\u4f75\u7528\u3059\u308b\u3068\u3001\u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u306b\u8a8d\u8a3c\u30dd\u30ea\u30b7\u30fc\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u3055\u3089\u306a\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/li>\n<li><strong>ISP<\/strong>\u2500SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001ISP\u306b\u3068\u3063\u3066\u3082\u6709\u76ca\u3067\u3059\u3002SPF\u30ec\u30b3\u30fc\u30c9\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u30e1\u30fc\u30eb\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u304c\u518d\u5ea6\u5fc5\u8981\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u5834\u5408\u306f\u3001\u30e1\u30fc\u30eb\u304c\u591a\u304f\u306e\u30b5\u30fc\u30d0\u30fc\u3067\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u308a\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u3068\u5224\u5b9a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u3068\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u306a\u3069\u306e\u60aa\u610f\u3042\u308b\u696d\u8005\u306b\u3088\u308b\u507d\u88c5\u30e1\u30fc\u30eb\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u3066\u3001\u81ea\u793e\u306e\u8a55\u5224\u3092\u5b88\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u3068\u7de8\u96c6\u65b9\u6cd5<\/h2>\n<p>\u6b21\u306b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u3068\u7de8\u96c6\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u65b9\u6cd5<\/h3>\n<figure id=\"attachment_128287\" aria-describedby=\"caption-attachment-128287\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128287 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/How-to-Create-.jpg\" alt=\"SPF\u30ec\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\uff08\u753b\u50cf\u51fa\u5178: SendPulse\uff09\" width=\"900\" height=\"393\"><figcaption id=\"caption-attachment-128287\" class=\"wp-caption-text\">SPF\u30ec\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/sendpulse.com\/knowledge-base\/smtp\/how-create-spf-record\" target=\"_blank\" rel=\"noopener noreferrer\">SendPulse<\/a>\uff09<\/figcaption><\/figure>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u306b\u53d6\u308a\u639b\u304b\u308b\u524d\u306b\u3001\u307e\u305a\u306f\u305d\u3082\u305d\u3082\u8a2d\u5b9a\u304c\u5fc5\u8981\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u3053\u3053\u3067\u6ce8\u76ee\u3059\u308b\u306e\u304c\u3001Return-Path\u3067\u3059\u3002SPF\u306f\u3001From\u30c9\u30e1\u30a4\u30f3\u3067\u306f\u306a\u304f\u3001\u4e3b\u306bReturn-Path\u3067\u4f7f\u7528\u3055\u308c\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u6a5f\u80fd\u3059\u308b\u305f\u3081\u3001\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bReturn-Path\u3092\u78ba\u304b\u3081\u307e\u3059\u3002<\/p>\n<p>Google\u306a\u3069\u306e\u7279\u5b9a\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\uff08ESP\uff09\u3067\u306f\u3001\u81ea\u5206\u306e\u30c9\u30e1\u30a4\u30f3\u3092Return-Path\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u30c9\u30e1\u30a4\u30f3\u306b\u72ec\u81ea\u306eSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u4e00\u65b9\u3067\u3001Postmark\u306a\u3069\u306eESP\u306e\u5834\u5408\u306f\u3001Return-path\u306bESP\u306e\u30c9\u30e1\u30a4\u30f3\u304c\u4f7f\u7528\u3055\u308c\u308b\u305f\u3081\u3001\u72ec\u81ea\u306bSPE\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u304c\u5fc5\u8981\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u65e9\u901f\u8a2d\u5b9a\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>\u30b9\u30c6\u30c3\u30d71. \u30e1\u30fc\u30eb\u9001\u4fe1\u5143\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u7279\u5b9a\u3059\u308b<\/h4>\n<p>\u4f01\u696d\u3067\u306f\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u5143\u304c\u8907\u6570\u3042\u308b\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6700\u521d\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u3001\u81ea\u793e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u3069\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3066\u3044\u308b\u304b\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u3002\u30c6\u30ad\u30b9\u30c8\u6587\u66f8\u3084\u30b9\u30d7\u30ec\u30c3\u30c9\u30b7\u30fc\u30c8\u306b\u3001\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068\u5bfe\u5fdc\u3059\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u4e00\u89a7\u306b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u4f7f\u7528\u3055\u308c\u308b\u3059\u3079\u3066\u306e\u624b\u6bb5\u3082\u7279\u5b9a\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u3001Microsoft Exchange\u306a\u3069\u306e\u793e\u5185\u7528\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3001ESP\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3001\u9867\u5ba2\u304c\u5229\u7528\u3057\u3066\u3044\u308b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u306e\u30b5\u30fc\u30d0\u30fc\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/secure-email-providers\/\">\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc<\/a>\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>IP\u30a2\u30c9\u30ec\u30b9\u304c\u4e0d\u660e\u306a\u5834\u5408\u306f\u3001ESP\u306b\u554f\u3044\u5408\u308f\u305b\u3066\u3001\u30a2\u30ab\u30a6\u30f3\u30c8\u306b\u95a2\u9023\u3059\u308b\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u60c5\u5831\u3092\u5165\u624b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u7ba1\u7406\u8005\u306e\u624b\u3092\u501f\u308a\u3066\u3001\u4e8b\u696d\u3067\u4f7f\u7528\u3057\u3066\u3044\u308b\u3059\u3079\u3066\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<h4>\u30b9\u30c6\u30c3\u30d72. \u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u3092\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3059\u308b<\/h4>\n<p>\u4f01\u696d\u3067\u3042\u308c\u3070\u3001\u8907\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6240\u6709\u3057\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3046\u3061\u3001\u4e00\u90e8\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u30e1\u30fc\u30eb\u9001\u4fe1\u7528\u306b\u3001\u305d\u306e\u4ed6\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u5225\u306e\u76ee\u7684\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u76ee\u7684\u306b\u95a2\u308f\u3089\u305a\u3001\u6240\u6709\u3059\u308b\u5404\u30c9\u30e1\u30a4\u30f3\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u9001\u4fe1\u7528\u306e\u30c9\u30e1\u30a4\u30f3\u4ee5\u5916\u306b\u3082\u8a2d\u5b9a\u304c\u5fc5\u8981\u306a\u7406\u7531\u3068\u3057\u3066\u306f\u3001\u30b5\u30a4\u30d0\u30fc\u72af\u7f6a\u8005\u304cSPF\u3067\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u305d\u306e\u4ed6\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u5229\u7528\u3057\u3066\u3001\u306a\u308a\u3059\u307e\u3057\u3092\u8a66\u307f\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<h4>\u30b9\u30c6\u30c3\u30d73. SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3059\u308b<\/h4>\n<p>SPF\u306f\u3001\u9001\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068\u3001\u9001\u4fe1\u8005\u304c<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-dns\/\">DNS<\/a>\u30ec\u30b3\u30fc\u30c9\u3067\u516c\u958b\u3057\u305f\u6b63\u898f\u306e\u9001\u4fe1\u8005IP\u30a2\u30c9\u30ec\u30b9\u3068\u3092\u7167\u3089\u3057\u5408\u308f\u305b\u3001\u9001\u4fe1\u8005\u306e\u8eab\u5143\u3092\u691c\u8a3c\u3057\u3066\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3059\u308b\u306b\u306f\u3001<code>v=spf1<\/code>\u3092\u8a18\u8ff0\u3057\u305f\u5f8c\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u8a31\u53ef\u3059\u308bIP\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u304d\u307e\u3059\uff08\u4f8b: <code>v=spf1 ip4:192.0.0.1 -all<\/code>\uff09\u3002<\/p>\n<p>\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li>SPF\u30ec\u30b3\u30fc\u30c9\u306b<code>include<\/code>\u3092\u8ffd\u52a0\u3057\u3066\u3001\u305d\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9\u304c\u6b63\u5f53\u306a\u9001\u4fe1\u8005\u3067\u3042\u308b\u3053\u3068\u3092\u5b9a\u7fa9\u3059\u308b\uff08\u4f8b: <code>include:google.com<\/code>\uff09<\/li>\n<li>\u30c9\u30e1\u30a4\u30f3\u306b\u95a2\u9023\u3059\u308b\u3059\u3079\u3066\u306e\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u3057\u305f\u5f8c\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6700\u5f8c\u306b<code>-all<\/code>\uff08HARDFAIL\uff09\u307e\u305f\u306f<code>~all<\/code>\uff08SOFTFAIL\uff09\u3092\u3064\u3051\u308b\uff08\u4e3b\u8981\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u3001<code>-all<\/code>\u3068<code>~all<\/code>\u306e\u3069\u3061\u3089\u3082\u8a8d\u8a3c\u5931\u6557\u3092\u610f\u5473\u3059\u308b\u304c\u3001\u4e00\u822c\u7684\u306b\u306f\u3001<code>-all<\/code>\u306e\u65b9\u304c\u5b89\u5168\uff09<\/li>\n<li>SPF\u30ec\u30b3\u30fc\u30c9\u306f255\u6587\u5b57\u3001include\u6a5f\u69cb\uff08\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3068\u3082\uff09\u306f10\u3092\u8d85\u3048\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f\u3059\u308b<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u4f8b\u3067\u3059\u3002<\/p>\n<p><code>v=spf1 ip4:192.0.0.1 include:google.com -all<\/code><\/p>\n<p>\u306a\u304a\u3001\u3053\u308c\u306f\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u884c\u3046\u30c9\u30e1\u30a4\u30f3\u7528\u3067\u3001\u305d\u306e\u4ed6\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u4fee\u98fe\u5b50\uff08<code>-all<\/code>\u4ee5\u5916\uff09\u3092\u9664\u5916\u3057\u305f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306aSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><code>v=spf1 \u2013all<\/code><\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u3092\u7d42\u3048\u305f\u3089\u3001\u6b21\u306f\u3053\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u516c\u958b\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h4>\u30b9\u30c6\u30c3\u30d74. SPF\u30ec\u30b3\u30fc\u30c9\u3092\u516c\u958b\u3059\u308b<\/h4>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u5b9a\u7fa9\u3092\u7d42\u3048\u305f\u3089\u3001DNS\u306b\u3053\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e2\u901a\u308a\u3002<\/p>\n<ol>\n<li>\u793e\u5185\u306eDNS\u7ba1\u7406\u8005\u3068\u9023\u643a\u3057\u3001DNS\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\uff08DNS\u30b5\u30fc\u30d3\u30b9\u306e\u7ba1\u7406\u753b\u9762\u3067\u7c21\u5358\u306b\u8ffd\u52a0\u53ef\u80fd\uff09<\/li>\n<li>DNS\u30b5\u30fc\u30d3\u30b9\u306b\u554f\u3044\u5408\u308f\u305b\u3066\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8ffd\u52a0\u3092\u4f9d\u983c\u3059\u308b<\/li>\n<\/ol>\n<p>\u3053\u308c\u306b\u3088\u3063\u3066\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/gmail-smtp-server\/\">Gmail<\/a>\u3001Hotmail\u3001Mailbird\u306a\u3069\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u53d7\u4fe1\u8005\u304cSPF\u30ec\u30b3\u30fc\u30c9\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>DNS\u30ec\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3059\u308b\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u3067\u884c\u306a\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol>\n<li>\u30c9\u30e1\u30a4\u30f3\u3092\u7d10\u4ed8\u3051\u3057\u3066\u3044\u308b\u30b5\u30fc\u30d0\u30fc\u306e\u30a2\u30ab\u30a6\u30f3\u30c8\u306b\u30ed\u30b0\u30a4\u30f3<\/li>\n<li>\u8a72\u5f53\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u9078\u629e<\/li>\n<li>DNS\u30ec\u30b3\u30fc\u30c9\u304c\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u753b\u9762\u306b\u79fb\u52d5\uff08DNS\u30de\u30cd\u30fc\u30b8\u30e3\u3067\u3082\u53ef\uff09<\/li>\n<li>TXT\u30ec\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3057\u3001Host\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u5b9a\u7fa9<\/li>\n<li>TXT\u5024\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u3001TTL\uff08Time To Live\uff09\u3092\u6307\u5b9a<\/li>\n<li>\u8a2d\u5b9a\u3092\u4fdd\u5b58\u3057\u3066DNS\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0<\/li>\n<\/ol>\n<h4>\u30b9\u30c6\u30c3\u30d75. SPF\u30ec\u30b3\u30fc\u30c9\u3092\u30c6\u30b9\u30c8\u3059\u308b<\/h4>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u3066\u516c\u958b\u3057\u305f\u3089\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\u306b\u306f\u3001Dmarcian\u3001Agari\u3001Mimecast\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u52b9\u6027\u3001\u304a\u3088\u3073\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3059\u3079\u3066\u306e\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u5834\u5408\u306f\u3001\u9001\u4fe1IP\u30a2\u30c9\u30ec\u30b9\u3092\u6b8b\u3057\u3066\u30ec\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u8ffd\u52a0\u65b9\u6cd5<\/h3>\n<figure id=\"attachment_128288\" aria-describedby=\"caption-attachment-128288\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128288 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/How-to-Add.jpg\" alt=\"SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\uff08\u753b\u50cf\u51fa\u5178: One\uff09\" width=\"900\" height=\"605\"><figcaption id=\"caption-attachment-128288\" class=\"wp-caption-text\">SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/help.one.com\/hc\/en-us\/articles\/115005595945-Add-an-SPF-record\" target=\"_blank\" rel=\"noopener noreferrer\">One<\/a>\uff09<\/figcaption><\/figure>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3092\u30c9\u30e1\u30a4\u30f3\u306b\u8ffd\u52a0\u3059\u308b\u306b\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u306eDNS\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30d1\u30cd\u30eb\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002Kinsta\u306a\u3069\u306e\u30b5\u30fc\u30d0\u30fc\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001DNS\u3078\u306eSPF\u30ec\u30b3\u30fc\u30c9\u306e\u8ffd\u52a0\u306f\u6bd4\u8f03\u7684\u5bb9\u6613\u3067\u3059\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u7167\u3057\u3066\u3001\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u3067\u306f\u3001\u901a\u5e38\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u884c\u3048\u308b\u3088\u3046\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u516c\u958b\u3057\u3066\u3044\u307e\u3059\u3002\u5c02\u9580\u77e5\u8b58\u304c\u306a\u3044\u3001\u307e\u305f\u306fISP\u304cDNS\u30ec\u30b3\u30fc\u30c9\u3092\u7ba1\u7406\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u3001IT\u62c5\u5f53\u8005\u306b\u4e00\u4efb\u3059\u308b\u306e\u304c\u30d9\u30b9\u30c8\u3067\u3059\u3002<\/p>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u5236\u9650\u4e8b\u9805<\/h2>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3084<a href=\"https:\/\/kinsta.com\/jp\/blog\/email-tracking-software\/\">\u914d\u4fe1\u6027<\/a>\u306e\u9762\u3067\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3042\u308b\u4e00\u5b9a\u306e\u5236\u9650\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>DNS\u306eSPF\u30ec\u30b3\u30fc\u30c9<\/h3>\n<p>\u521d\u671f\u306eSPF\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u3001\u5c0e\u5165\u3084\u30c6\u30b9\u30c8\u3092\u52b9\u7387\u3088\u304f\u884c\u3048\u308b\u69d8\u3001\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u306eDNS TXT\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002DNS\u306eTXT\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u610f\u5473\u4ed8\u3051\u306e\u306a\u3044\u81ea\u7531\u5f62\u5f0f\u306e\u30c6\u30ad\u30b9\u30c8\u3068\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u3057\u304b\u3057\u30012005\u5e74\u306bIANA\u306b\u3088\u3063\u3066SPF\u306b\u30b3\u30fc\u30c999\u306e\u30ea\u30bd\u30fc\u30b9\u30ec\u30b3\u30fc\u30c9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u4ee5\u964d\u3001\u305d\u306e\u8907\u96d1\u3055\u304b\u3089SPF\u5229\u7528\u304c\u6e1b\u5c11\u3057\u30012014\u5e74\u306b\u5ec3\u6b62\u3055\u308c\u308b\u3053\u3068\u306b\u3002<\/p>\n<h3>\u30d8\u30c3\u30c0\u30fc\u306b\u95a2\u3059\u308b\u554f\u984c<\/h3>\n<p>\u5f53\u521d\u3001SPF\u306f\u3001\u653b\u6483\u8005\u304c\u30e1\u30fc\u30eb\u306e\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7From\uff08Return-Path\uff09\u3092\u507d\u9020\u3059\u308b\u306e\u3092\u9632\u3050\u305f\u3081\u306b\u958b\u767a\u3055\u308c\u307e\u3057\u305f\u3002\u3068\u3053\u308d\u304c\u3001\u73fe\u5728\u3067\u306f\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc\u306eFrom\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u307f\u304c\u6539\u3056\u3093\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u3001MTA\uff08\u30e1\u30fc\u30eb\u8ee2\u9001\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\uff09\u3067\u51e6\u7406\u3055\u308c\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u53d7\u4fe1\u8005\u306e\u76ee\u306b\u89e6\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u304c\u3001\u306a\u308a\u3059\u307e\u3057\u306e\u30ea\u30b9\u30af\u3092\u52a9\u9577\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc\u306eFrom\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u3001DMARC\u3067SPF\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u8868\u793a\u540d\u507d\u88c5\u306b\u5bfe\u7b56\u3092\u8b1b\u3058\u308b\u306b\u306f\u3001SPF\u3088\u308a\u3082\u9ad8\u5ea6\u306a\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u304c\u5fc5\u8981\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u30e1\u30fc\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0\uff08\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u4e00\u9023\u306e\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u5143\u304b\u3089\u53d7\u4fe1\u5143\u3078\u9001\u3089\u308c\u308b\u7d4c\u8def\uff09\u306e\u8ffd\u52a0\u3084\u3001ISP\u306e\u5909\u66f4\u3092\u884c\u306a\u3063\u305f\u5834\u5408\u306b\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u66f4\u65b0\u306f\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u30e1\u30fc\u30eb\u306e\u8ee2\u9001\u3092\u4e2d\u65ad\u3059\u308b\u6050\u308c\u304c\u3042\u308a\u3001\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306f\u4fdd\u8a3c\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u30fb\u7ba1\u7406\u306b\u95a2\u3059\u308b\u6ce8\u610f\u4e8b\u9805\u3092\u3054\u7d39\u4ecb\u3059\u308b\u524d\u306b\u3001\u307e\u305a\u306f\u4e00\u822c\u7684\u306a\u3082\u306e\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u9001\u4fe1\u5074IP\u30a2\u30c9\u30ec\u30b9\u306b\u306f\u3001PTR\u30ec\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u2500PTR\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u30db\u30b9\u30c8\u540d\u3068\u4e00\u7dd2\u306bIP\u30a2\u30c9\u30ec\u30b9\u3092\u8abf\u3079\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u9006\u5f15\u304d\u306e\u96fb\u8a71\u5e33\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u516c\u5171\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u30a2\u30af\u30bb\u30b9\u30dd\u30a4\u30f3\u30c8\u3084\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u63a5\u7d9a\u306e\u305f\u3081\u306e\u4f4f\u5b85\u7528IP\u30a2\u30c9\u30ec\u30b9\u306b\u306f\u3001PTR\u30ec\u30b3\u30fc\u30c9\u304c\u306a\u3044\u50be\u5411\u306b\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u7740\u4fe1\u63a5\u7d9a\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3092\u4f7f\u7528\u3059\u308b\u2500SPF\u3001DMARC\u3001DKIM\u3001\u3044\u305a\u308c\u304b\u307e\u305f\u306f\u3059\u3079\u3066\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u4f7f\u7528\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u3092\u5229\u7528\u3059\u308b\u9001\u4fe1\u8005\u306f\u3001\u5229\u7528\u3057\u306a\u3044\u9001\u4fe1\u8005\u3068\u6bd4\u3079\u3066\u3001\u8b58\u5225\u304c\u7c21\u5358\u3067\u3042\u308a\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u306b\u3088\u3063\u3066\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u306b\u6652\u3055\u308c\u308b\u53ef\u80fd\u6027\u3092\u8efd\u6e1b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u3092\u5229\u7528\u3059\u308c\u3070\u3001\u5fc5\u305a\u914d\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u304c\u9867\u5ba2\u306b\u5c4a\u304f\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u4fdd\u8b77\u52b9\u679c\u306f\u9ad8\u307e\u308a\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\u3092\u76e3\u8996\u30fb\u4fdd\u8b77\u3059\u308b\u305f\u3081\u306e\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u4ed5\u7d44\u307f\u306f\u3001\u3042\u308b\u306b\u8d8a\u3057\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<li><code>+all<\/code>\u306e\u4f7f\u7528\u3001\u307e\u305f\u306f\u30ec\u30b3\u30fc\u30c9\u3078\u306e\u8ffd\u52a0\u306f\u5fc5\u305a\u907f\u3051\u308b\u2500<code>all<\/code>\u306f\u3001<code>~all<\/code>\u307e\u305f\u306f<code>-all<\/code>\u3068\u3057\u3066\u306e\u307f\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u4e00\u822c\u7684\u306a\u6ce8\u610f\u4e8b\u9805\u306b\u52a0\u3048\u3066\u3001\u4ee5\u4e0b\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6ce8\u610f\u4e8b\u9805\u3082\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>\u9650\u5b9a\u7684\u306aSPF\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n<p>SPF\u306b\u306f\u3001\u5f37\u529b\u3067\u8907\u96d1\u306a\u4ed5\u7d44\u307f\u304c\u591a\u6570\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u3059\u3079\u3066\u3092SPF\u30ec\u30b3\u30fc\u30c9\u3067\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002SPF\u30ec\u30b3\u30fc\u30c9\u306f\u30b7\u30f3\u30d7\u30eb\u306b\u3001\u5fc5\u8981\u306a\u6570\u3060\u3051\u3092\u5b9a\u7fa9\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><code>include:<\/code>\u306b\u3082\u540c\u3058\u3053\u3068\u304c\u8a00\u3048\u307e\u3059\u3002DNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u6570\u304c\u4e0a\u9650\u3067\u3042\u308b10\u56de\u3092\u8d85\u3048\u3066\u3057\u307e\u308f\u306a\u3044\u69d8\u3001\u6570\u306f\u53ef\u80fd\u306a\u9650\u308a\u6291\u3048\u3066\u3001\u5165\u308c\u5b50\u69cb\u9020\u306f\u907f\u3051\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u3001\u5e83\u7bc4\u306aIP\u30a2\u30c9\u30ec\u30b9\u3092\u500b\u5225\u306b\u8ffd\u52a0\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4e00\u5ea6\u306b\u8ffd\u52a0\u3059\u308b\u3068\u51e6\u7406\u304c\u7c21\u7d20\u5316\u3055\u308c\u3001\u624b\u9593\u306e\u524a\u6e1b\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<h3>IP\u30a2\u30c9\u30ec\u30b9\u306e\u7bc4\u56f2\u3092CIDR\u8868\u8a18\u3067\u6307\u5b9a\u3059\u308b<\/h3>\n<p>1\u3064\u306e\u30df\u30b9\u3067\u5024\u304c\u5927\u304d\u304f\u5909\u308f\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3092\u8003\u616e\u3057\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u7bc4\u56f2\u306fCIDR\uff08\u30b5\u30a4\u30c0\u30fc\uff09\u8868\u8a18\u3067\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002\u653b\u6483\u8005\u306b\u3088\u3063\u3066\u30b7\u30b9\u30c6\u30e0\u306e\u4e00\u90e8\u304c\u5371\u967a\u306b\u6652\u3055\u308c\u3001\u305d\u306e\u4e00\u90e8\u304c\u3053\u306e\u7bc4\u56f2\u306b\u542b\u307e\u308c\u308bIP\u30a2\u30c9\u30ec\u30b9\u3092\u4fdd\u6301\u3057\u3066\u3044\u305f\u3068\u3057\u305f\u3089\u3001\u81f4\u547d\u7684\u306a\u3053\u3068\u306b\u306a\u308a\u304b\u306d\u307e\u305b\u3093\u3002\u653b\u6483\u8005\u304c\u8a8d\u8a3c\u3055\u308c\u305f\u6b63\u898fIP\u30a2\u30c9\u30ec\u30b9\u3092\u60aa\u7528\u3057\u3066\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308c\u3070\u3001\u4fe1\u7528\u3068\u5927\u4e8b\u306a\u30c7\u30fc\u30bf\u3092\u5931\u3044\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/why-are-my-emails-going-to-spam\/\">\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u306b\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a<\/a>\u3055\u308c\u3066\u3057\u307e\u3046\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u30ea\u30b9\u30af\u306f\u975e\u5e38\u306b\u5927\u304d\u304f\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u306f\u4f53\u5236\u3092\u5f37\u5316\u3057\u3001\u7591\u308f\u3057\u3044\u30c9\u30e1\u30a4\u30f3\u3092\u30d6\u30ed\u30c3\u30af\u3057\u305f\u308a\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3067\u6709\u52b9\u3068\u307f\u306a\u3059CIDR\u306e\u7bc4\u56f2\u3092\u5236\u9650\u3057\u305f\u308a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>all\u6a5f\u69cb\u306e\u4f7f\u7528\u3092\u907f\u3051\u308b<\/h3>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3067\u306f\u3001<code>+all<\/code>\u3092\u4f7f\u7528\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u69cb\u6587\u7684\u306b\u306f\u6709\u52b9\u3067\u3042\u308b\u3082\u306e\u306e\u3001\u8a31\u53ef\u7bc4\u56f2\u304c\u5e83\u304f\u306a\u308a\u3059\u304e\u3066\u3057\u307e\u3044\u3001\u3053\u306e\u7a2e\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u554f\u984c\u306e\u691c\u51fa\u304c\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002\u30ec\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u30c4\u30fc\u30eb\u3084\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3089\u3001\u8b58\u5225\u3055\u308c\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><code>+all<\/code>\u306f\u3001\u6587\u5b57\u901a\u308a\u3001\u60aa\u610f\u306e\u3042\u308b\u3082\u306e\u3092\u542b\u3081\u3066\u30a6\u30a7\u30d6\u5168\u4f53\u3067\u30c9\u30e1\u30a4\u30f3\u306e\u4ee3\u308f\u308a\u306b\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u8a31\u53ef\u3059\u308b\u6a5f\u69cb\u3067\u3059\u3002\u8ff7\u60d1\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u306b\u95a2\u4e0e\u3057\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u306f\u3001<code>+all<\/code>\u3067\u7d42\u308f\u308bSPF\u30ec\u30b3\u30fc\u30c9\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u7d50\u679c\u3001\u3069\u306eIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u3067\u3082\u3001<a href=\"https:\/\/kinsta.com\/jp\/blog\/types-of-malware\/\">\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u611f\u67d3\u30e1\u30fc\u30eb<\/a>\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30ec\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u306b\u6ce8\u610f<\/h3>\n<p>\u539f\u5247\u3001\u30c9\u30e1\u30a4\u30f3\u306b\u8a2d\u5b9a\u3059\u308bSPF\u30ec\u30b3\u30fc\u30c9\u306f1\u3064\u3002\u3064\u307e\u308a\u3001<code>v=spf1<\/code>\u3067\u59cb\u307e\u308bTXT\u30ec\u30b3\u30fc\u30c9\u306f1\u3064\u3060\u3051\u4fdd\u5b58\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u306b\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u6052\u4e45\u7684\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306eSPF\u306e\u5236\u9650\u306b\u9055\u53cd\u3059\u308b\u30b1\u30fc\u30b9\u306f\u4e00\u822c\u7684\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u5185\u3067\u3055\u307e\u3056\u307e\u306a\u30b5\u30fc\u30d3\u30b9\u3092\u5c0e\u5165\u3057\u3066\u3044\u3066\u3001\u5404\u30b5\u30fc\u30d3\u30b9\u306e\u63d0\u4f9b\u5143\u3067\u305d\u308c\u305e\u308c\u30c9\u30e1\u30a4\u30f3\u3078\u306eSPF\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u306b\u3088\u304f\u898b\u3089\u308c\u307e\u3059\u3002<\/p>\n<figure id=\"attachment_128289\" aria-describedby=\"caption-attachment-128289\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128289 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/duplicate-data-1-1.jpg\" alt=\"\u91cd\u8907\u3057\u305f\u30ec\u30b3\u30fc\u30c9\uff08\u753b\u50cf\u51fa\u5178: Data Axle\uff09\" width=\"900\" height=\"398\"><figcaption id=\"caption-attachment-128289\" class=\"wp-caption-text\">\u91cd\u8907\u3057\u305f\u30ec\u30b3\u30fc\u30c9\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/www.dataaxlegenie.com\/blog\/this-is-why-duplicate-data-is-bad-for-you\/\" target=\"_blank\" rel=\"noopener noreferrer\">Data Axle<\/a>\uff09<\/figcaption><\/figure>\n<p>\u30ec\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u306f\u3001\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u6027\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3092\u62db\u304d\u3001\u9867\u5ba2\u306e\u4fe1\u7528\u3092\u5931\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002Google\u3084Microsoft\u306e\u3088\u3046\u306a\u5927\u624b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u306b\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u4e8b\u614b\u3092\u9632\u3050\u305f\u3081\u3001\u91cd\u8907\u3057\u305f\u30ec\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u4fee\u6b63\u3059\u308b\u6a5f\u80fd\u304c\u5099\u308f\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u5c0f\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u30b7\u30b9\u30c6\u30e0\u306b\u306f\u3053\u306e\u3088\u3046\u306a\u6a5f\u80fd\u304c\u306a\u3044\u3053\u3068\u3082\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u3092\u898b\u3064\u3051\u305f\u3089\u3001\u3059\u3050\u306b\u5bfe\u51e6\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5e78\u3044\u3001\u5bfe\u51e6\u65b9\u6cd5\u306f\u975e\u5e38\u306b\u7c21\u5358\u3067\u3059\u3002\u8907\u6570\u306eSPF\u30ec\u30b3\u30fc\u30c9\u3092\u6301\u3064\u4f01\u696d\u3067\u3042\u308c\u3070\u30011\u3064\u306b\u7d71\u5408\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u30022\u3064\u306eSPF\u30ec\u30b3\u30fc\u30c9\u3092\u7d71\u5408\u3059\u308b\u3068\u3001<code>v=spf1<\/code>\u304c\u30ec\u30b3\u30fc\u30c9\u306e\u5148\u982d\u306b\u6b8b\u308a\u3001\u4e00\u5ea6\u3060\u3051\u8868\u793a\u3055\u308c\u3001<code>all<\/code>\u306f\u672b\u5c3e\u306b\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<h3>\u6587\u5b57\u6570\u306e\u5236\u9650<\/h3>\n<p>RFC\u306b\u3088\u308b\u3068\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6587\u5b57\u5236\u9650\u306f255\u6587\u5b57\u3067\u3059\u3002\u3053\u306e\u5236\u9650\u306f\u3001DNS\u306e\u3059\u3079\u3066\u306eTXT\u30ec\u30b3\u30fc\u30c9\u306b\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u5148\u306b\u3082\u89e6\u308c\u307e\u3057\u305f\u304c\u3001\u6587\u5b57\u5236\u9650\u3092\u8d85\u3048\u308bSPF\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30b7\u30b9\u30c6\u30e0\u3067\u4e00\u6642\u7684\u3001\u3042\u308b\u3044\u306f\u6052\u4e45\u7684\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3059\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002DNS\u7ba1\u7406\u8005\u304c\u3053\u308c\u306b\u5bfe\u51e6\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u6587\u5b57\u6570\u3092\u8d85\u904e\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u3092\u4fdd\u5b58\u3057\u3066\u3044\u308b\u9593\u306b\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>1\u3064\u306e\u6587\u5b57\u5217\u304c255\u6587\u5b57\u306b\u5236\u9650\u3055\u308c\u308b\u5834\u5408\u3067\u3082\u30011\u3064\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306b\u8907\u6570\u306e\u6587\u5b57\u5217\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u53d7\u4fe1\u5074\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304cSPF\u30ec\u30b3\u30fc\u30c9\u306e\u89e3\u6790\u3092\u958b\u59cb\u3057\u3001\u30ec\u30b3\u30fc\u30c9\u5185\u3067\u8907\u6570\u306e\u6587\u5b57\u5217\u304c\u691c\u51fa\u3055\u308c\u308b\u3068\u3001\u30b9\u30da\u30fc\u30b9\u306a\u3057\u3067\u7279\u5b9a\u306e\u9806\u5e8f\u3067\u7d50\u5408\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u89e3\u6790\u304c\u7d42\u308f\u308b\u3068\u3001\u30e1\u30fc\u30eb\u306e\u5185\u5bb9\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3059\u3002\u7e70\u308a\u8fd4\u3057\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u8907\u6570\u306e\u6587\u5b57\u5217\u3092\u8ffd\u52a0\u3057\u3066\u3082\u3001\u30ec\u30b3\u30fc\u30c9\u306e\u7dcf\u6587\u5b57\u6570\u306b\u306f\u5236\u9650\u304c\u3042\u308b\u3053\u3068\u3092\u304a\u5fd8\u308c\u306a\u304f\u3002\u3053\u306e\u5236\u9650\u306f\u3084\u3084\u8907\u96d1\u3067\u3059\u304c\u3001DNS\u30d1\u30b1\u30c3\u30c8\u304c\u63a8\u5968UDP\u30d1\u30b1\u30c3\u30c8\u30b5\u30a4\u30ba\u3067\u3042\u308b512\u30d0\u30a4\u30c8\u3092\u8d85\u3048\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306b\u8a2d\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u304c\u3053\u306e\u5236\u9650\u3092\u8d85\u3048\u308b\u5834\u5408\u306f\u3001\u30b5\u30d6\u30ec\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3057\u30011\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u5206\u5272\u3057\u3066\u3001\u554f\u984c\u3092\u56de\u907f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u306a\u304a\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3092\u5206\u5272\u3059\u308b\u969b\u306f\u3001\u30e1\u30a4\u30f3\u3068\u306a\u308b\u90e8\u5206\u306b\u5404\u30b5\u30d6\u30ec\u30b3\u30fc\u30c9\u3092\u542b\u3081\u307e\u3059\u3002\u305f\u3060\u3057\u3001DNS\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u6570\u304c\u5897\u3048\u3059\u304e\u3066\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h3>DNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u6570\u3092\u5236\u9650\u3059\u308b<\/h3>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6700\u5927\u6587\u5b57\u6570\u304c255\u6587\u5b57\u3067\u3042\u308b\u3053\u3068\u3068\u306f\u5225\u306b\u3001DNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u56de\u6570\u3082\u5236\u9650\u3057\u3066\u304f\u3060\u3055\u3044\u3002RFC\u306e\u4ed5\u69d8\u3067\u306f\u3001\u30ec\u30b3\u30fc\u30c9\u5185\u3067\u5b9f\u884c\u3055\u308c\u308bDNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u6570\u306f\u300110\u56de\u3092\u8d85\u3048\u306a\u3044\u3088\u3046\u306b\u6307\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001DNS\u306e\u7121\u9650\u30eb\u30fc\u30d7\u3084<a href=\"https:\/\/kinsta.com\/jp\/blog\/what-is-a-ddos-attack\/\">DDoS\uff08Distributed Denial of Service\uff09\u653b\u6483<\/a>\u306a\u3069\u306e\u5bfe\u7b56\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u3001\u30ec\u30b3\u30fc\u30c9\u5185\u306710\u56de\u4ee5\u4e0a\u306e\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u3001\u4e00\u4f53\u4f55\u304c\u8d77\u3053\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>SPF\u8a8d\u8a3c\u6642\u306b\u6052\u4e45\u7684\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002SPF\u6a5f\u69cb\u306e<code>include:<\/code>\u3001<code>a<\/code>\u3001<code>PTR<\/code>\u3001<code>mx<\/code>\u3001<code>exists<\/code>\u3001<code>redirect<\/code>\u306f\u3001DNS\u30af\u30a8\u30ea\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<p><code>all<\/code>\u3001<code>ip4<\/code>\u3001<code>ip6<\/code>\u6a5f\u69cb\u306f\u3001DNS\u30af\u30a8\u30ea\u306b\u5bfe\u3057\u3066\u6570\u3048\u3089\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u9577\u3059\u304e\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u5206\u5272\u306b\u4f7f\u7528\u3059\u308b\u30b5\u30d6\u30ec\u30b3\u30fc\u30c9\u306a\u3069\u3001\u5165\u308c\u5b50\u69cb\u9020\u306b\u306a\u3063\u305finclude\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002SPF\u30ec\u30b3\u30fc\u30c9\u304c\u751f\u6210\u3059\u308bDNS\u30af\u30a8\u30ea\u3092\u5897\u52a0\u3055\u305b\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3067\u904e\u5270\u306aDNS\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u306a\u3044\u3088\u3046\u306b\u6c17\u3092\u3064\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u30b5\u30d6\u30cd\u30c3\u30c8\u3068IP\u30a2\u30c9\u30ec\u30b9\u306e\u91cd\u8907\u3092\u907f\u3051\u308b<\/h3>\n<figure id=\"attachment_128290\" aria-describedby=\"caption-attachment-128290\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128290 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/subnetduplicate-1.jpg\" alt=\"IP\u30a2\u30c9\u30ec\u30b9\u306e\u91cd\u8907\uff08\u753b\u50cf\u51fa\u5178: YouTube\uff09\" width=\"900\" height=\"675\"><figcaption id=\"caption-attachment-128290\" class=\"wp-caption-text\">IP\u30a2\u30c9\u30ec\u30b9\u306e\u91cd\u8907\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/youtu.be\/1KhrM5u0ziw\" target=\"_blank\" rel=\"noopener noreferrer\">YouTube<\/a>\uff09<\/figcaption><\/figure>\n<p>\u3059\u3079\u3066\u306eSPF\u30a8\u30f3\u30c8\u30ea\u306f\u3001\u30b5\u30d6\u30cd\u30c3\u30c8\u307e\u305f\u306fIP\u30a2\u30c9\u30ec\u30b9\u306b\u89e3\u6c7a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u8a31\u53ef\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u3084\u30b7\u30b9\u30c6\u30e0\u306e\u4e00\u89a7\u3092\u4f5c\u6210\u3059\u308b\u969b\u3001\u91cd\u8907\u3059\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u3084IP\u30a2\u30c9\u30ec\u30b9\u751f\u6210\u3055\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u306e\u30c9\u30e1\u30a4\u30f3\u306eMX\u30ec\u30b3\u30fc\u30c9\u3068\u540c\u69d8\u3067\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306b<code>include:<\/code>\u3092\u8ffd\u52a0\u3057\u305f\u969b\u306b\u767a\u751f\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u3053\u306eIP\u306f\u3001\u542b\u307e\u308c\u308b\u30b5\u30d6\u30cd\u30c3\u30c8\u306b\u5c5e\u3057\u3066\u3044\u308b\u540c\u3058\u3082\u306e\u3067\u3042\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u307b\u3068\u3093\u3069\u5909\u66f4\u3055\u308c\u306a\u3044\u5834\u5408\u306f\u3001ip4\u307e\u305f\u306fipv6\u8868\u8a18\u3092\u4f7f\u7528\u3059\u308b\u306e\u304c\u5f97\u7b56\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u53d7\u4fe1\u8005\u304cDNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306eDNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306f10\u56de\u306b\u9650\u3089\u308c\u308b\u305f\u3081\u3001\u9001\u4fe1\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u591a\u3044\u5834\u5408\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u52a0\u3048\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u70b9\u3082\u8003\u616e\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li><code>include:<\/code>\u306e\u6570\u3092\u6291\u3048\u3001\u53ef\u80fd\u306a\u3089\u5165\u308c\u5b50\u69cb\u9020\u3092\u907f\u3051\u308b<\/li>\n<li><code>+all<\/code>\u3067\u306f\u306a\u304f\u3001<code>~all<\/code>\u307e\u305f\u306f<code>-all<\/code>\u3092\u4f7f\u7528\u3059\u308b<\/li>\n<li><code>exists<\/code>\u306e\u4f7f\u7528\u3092\u907f\u3051\u308b\u2500\u9069\u5207\u306b\u4f7f\u7528\u3057\u306a\u3051\u308c\u3070\u3001\u51e6\u7406\u4e2d\u306e\u30a8\u30e9\u30fc\u304b\u3089\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3092\u52a9\u9577\u3059\u308b\u6050\u308c\u304c\u3042\u308b<\/li>\n<li><code>ptr<\/code>\u306e\u4f7f\u7528\u3092\u907f\u3051\u308b\u2500SPF\u306e\u6700\u65b0RFC\u3067\u975e\u63a8\u5968<\/li>\n<li>DNS\u30ec\u30b3\u30fc\u30c9\u306e\u7a2e\u985e\u306f\u6307\u5b9a\u3057\u306a\u3044\u2500\u73fe\u5728\u306fTXT\u30ec\u30b3\u30fc\u30c9\u3067\u7121\u52b9<\/li>\n<li>CIDR\u8868\u8a18\u3067\u30a2\u30c9\u30ec\u30b9\u30d6\u30ed\u30c3\u30af\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u3001\/30\u304b\u3089\/16\u307e\u3067\u306e\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u2500\u30b9\u30e9\u30c3\u30b7\u30e5\u306e\u5f8c\u306e\u6570\u5b57\u304c\u5927\u304d\u3044\u307b\u3069\u3001\u30a2\u30c9\u30ec\u30b9\u30d6\u30ed\u30c3\u30af\u304c\u5c0f\u3055\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u3001\u5c0f\u3055\u3044\u307b\u3069\u826f\u3044\u3002\u307e\u305f\u3001\/1\uff5e\/15\u306e\u30d6\u30ed\u30c3\u30af\u306f\u3001\u53d7\u4fe1\u8005\u306b\u3088\u3063\u3066\u306f\u7121\u8996\u3055\u308c\u305f\u308a\u3001\u5272\u308a\u5f15\u304b\u308c\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308b\u305f\u3081\u975e\u63a8\u5968\u3002<\/li>\n<li>SPF\u30ec\u30b3\u30fc\u30c9\u3067\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3059\u3079\u3066\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u89e3\u6c7a\u3059\u308b\u2500Office365\u306e\u30af\u30e9\u30a6\u30c9\u30b5\u30fc\u30d3\u30b9\u304c\u7f6e\u304d\u63db\u3048\u305f\u3001\u30aa\u30f3\u30d7\u30ec\u30df\u30b9\u306b\u3042\u308bExchange\u30b5\u30fc\u30d0\u30fc\u306e\u3088\u3046\u306a\u53e4\u3044\u30b7\u30b9\u30c6\u30e0\u3092\u30b7\u30b9\u30c6\u30e0\u7ba1\u7406\u8005\u304c\u524a\u9664\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3002\u66f4\u65b0\u3055\u308c\u305fSPF\u30ec\u30b3\u30fc\u30c9\u306bOffice365\u304c\u5fc5\u8981\u3067\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u53e4\u3044\u30b7\u30b9\u30c6\u30e0\u3092\u524a\u9664\u3057\u3066\u3082\u3001\u307e\u3060\u66f4\u65b0\u3055\u308c\u3066\u3044\u306a\u3044\u53ef\u80fd\u6027\u304c\u3002\u3053\u306e\u5834\u5408\u3001SPF\u30ec\u30b3\u30fc\u30c9\u306e\u30c9\u30e1\u30a4\u30f3\u306f\u6b8b\u3063\u3066\u3044\u3066\u3082\u3001\u5b9f\u969b\u306b\u306f\u3082\u3046\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u306b\u306a\u308a\u3001\u4e00\u6642\u7684\u306bSPF\u306e\u8a8d\u8a3c\u306b\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u308b\u3002<\/li>\n<li>DKIM\u3084DMARC\u306a\u3069\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u30b7\u30b9\u30c6\u30e0\u3068SPF\u3092\u4f75\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u4fdd\u8b77\u3092\u3055\u3089\u306b\u5f37\u5316\u3059\u308b\u2500DKIM\u3084DMARC\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3082\u8981\u78ba\u8a8d\u3002<\/li>\n<\/ul>\n<h3>DKIM\u3068SPF\u306e\u4f75\u7528<\/h3>\n<p>DomainKeys Identified Mail\uff08DKIM\uff09\u306f\u3001\u516c\u958b\u9375\u6697\u53f7\u65b9\u5f0f\u3092\u4f7f\u3063\u305f\u96fb\u5b50\u7f72\u540d\u3092\u5229\u7528\u3057\u3066\u3001\u30e1\u30fc\u30eb\u306e\u6539\u3056\u3093\u304c\u884c\u308f\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306e\u8a8d\u8a3c\u6280\u8853\u3067\u3059\u3002DKIM\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u70b9\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li>\u653b\u6483\u8005\u306b\u60aa\u7528\u3055\u308c\u306a\u3044\u3088\u3046\u3001\u6697\u53f7\u9375\u306f\u5b9a\u671f\u7684\u306b\u66f4\u65b0\u3059\u308b\u2500\u591a\u304f\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u8005\u306f\u3001\u4f55\u5e74\u3082\u524d\u306b\u751f\u6210\u3055\u308c\u305f\u53e4\u3044\u9375\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u304c\u60aa\u7528\u3055\u308c\u308b\u30ea\u30b9\u30af\u3092\u9ad8\u3081\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u8a72\u5f53\u3059\u308b\u5834\u5408\u306f\u3001\u65b0\u305f\u306bDKIM\u9375\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001\u6708\u306b\u6570\u5343\u307e\u305f\u306f\u6570\u767e\u4e07\u901a\u306e\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u5834\u5408\u306f\u3001\u9375\u30921\u5e74\u306b\u4f55\u5ea6\u3082\u66f4\u65b0\u3059\u308b\u3053\u3068\u3067\u3001\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u30e1\u30fc\u30eb\u3092\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>\u9375\u9577\u306f\u5c11\u306a\u304f\u3068\u30821,024\u30d3\u30c3\u30c8\u306b\u25001,024\u30d3\u30c3\u30c8\u4ee5\u4e0b\u306e\u9375\u3067\u751f\u6210\u3055\u308c\u305f<a href=\"https:\/\/kinsta.com\/blog\/email-signature\/\">\u7f72\u540d<\/a>\u306f\u7121\u8996\u3055\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u591a\u304f\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u30012,048\u30d3\u30c3\u30c8\u307e\u305f\u306f\u305d\u308c\u4ee5\u4e0a\u306e\u9577\u3055\u3092\u4fdd\u3063\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>ESP\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u3059\u3079\u3066\u306e\u9867\u5ba2\u306b1\u3064\u306eDKIM\u9375\u3092\u4f7f\u7528\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u305d\u308c\u305e\u308c\u306e\u30e1\u30fc\u30eb\u306b\u72ec\u81ea\u306eDKIM\u9375\u3092\u5272\u308a\u5f53\u3066\u308b<\/li>\n<li>\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u306b\u6c17\u3065\u3044\u305f\u3089DKIM\u3092\u4f7f\u7528\u3057\u3066\u7f72\u540d\u3059\u308b<\/li>\n<\/ul>\n<h3>SPF\u3068DMARC\u306e\u4f75\u7528<\/h3>\n<p>Domain-based Message Authentication, Reporting, and Conformance \uff08DMARC\uff09\u306f\u3001SPF\u3068DKIM\u8a8d\u8a3c\u306e\u4ed5\u7d44\u307f\u3092\u5171\u901a\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u7d71\u5408\u3057\u3001\u30c9\u30e1\u30a4\u30f3\u6240\u6709\u8005\u304c\u3001\u30e1\u30fc\u30eb\u306e\u8a8d\u8a3c\u304c\u5931\u6557\u3057\u305f\u969b\u306e\u51e6\u7406\u65b9\u6cd5\u3092\u5b9a\u7fa9\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u6280\u8853\u3067\u3059\u3002<\/p>\n<p>DMARC\u306b\u306f\u3055\u307e\u3056\u307e\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30ec\u30dd\u30fc\u30c8\u6a5f\u80fd\u3067\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u3078\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u30e1\u30fc\u30eb\u3084\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u9001\u4fe1\u3055\u308c\u305f\u30e1\u30fc\u30eb\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u6307\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u9001\u4fe1\u3055\u308c\u305f\u4e0d\u6b63\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u7279\u5b9a\u30fb\u30d6\u30ed\u30c3\u30af\u3057\u3001\u9867\u5ba2\u3092\u4fdd\u8b77\u3059\u308b\u3068\u3068\u3082\u306b\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>DMARC\u3092\u5229\u7528\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306b\u306f\u3001\u4eca\u3059\u3050\u5c0e\u5165\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u4f7f\u7528\u3059\u308b\u969b\u306b\u306f\u3001\u30e1\u30fc\u30eb\u306b\u8b58\u5225\u5b50\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306f\u3001\u30e1\u30fc\u30eb\u304cDMARC\u306e\u691c\u8a3c\u3092\u901a\u904e\u3059\u308b\u306e\u306b\u4e0d\u53ef\u6b20\u3067\u3001\u3053\u308c\u304c\u306a\u3051\u308c\u3070\u3001\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u307e\u3067\u8a8d\u8a3c\u3055\u308c\u306a\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h2>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u306e\u78ba\u8a8d\u306b\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30c4\u30fc\u30eb\u304c\u5229\u7528\u3067\u304d\u307e\u3059\u3002SPF\u30ec\u30b3\u30fc\u30c9\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\u3001\u307e\u305f\u306fSPF\u30ec\u30b3\u30fc\u30c9\u30c1\u30a7\u30c3\u30ab\u30fc\u306a\u3069\u3068\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n<h3>SPF\u30ec\u30b3\u30fc\u30c9\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb<\/h3>\n<figure id=\"attachment_128291\" aria-describedby=\"caption-attachment-128291\" style=\"width: 1000px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-128291 size-full\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/07\/checkspf.png\" alt=\"SPF\u30ec\u30b3\u30fc\u30c9\u306e\u78ba\u8a8d\uff08\u753b\u50cf\u51fa\u5178: John Hanley\uff09\" width=\"1000\" height=\"400\"><figcaption id=\"caption-attachment-128291\" class=\"wp-caption-text\">SPF\u30ec\u30b3\u30fc\u30c9\u306e\u78ba\u8a8d\uff08\u753b\u50cf\u51fa\u5178: <a href=\"https:\/\/www.jhanley.com\/google-g-suite-sender-policy-framework-spf\/\" target=\"_blank\" rel=\"noopener noreferrer\">John Hanley<\/a>\uff09<\/figcaption><\/figure>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u6307\u6a19\u3092\u901a\u3057\u3066SPF\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u52b9\u6027\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>\u30ec\u30b3\u30fc\u30c9\u306e\u5b58\u5728<\/strong>\u2500\u6307\u5b9a\u3057\u305fSPF\u30ec\u30b3\u30fc\u30c9\u304c\u5b9f\u969b\u306bDNS\u306b\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d<\/li>\n<li><strong>\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9<\/strong>\u2500\u30ec\u30b3\u30fc\u30c9\u304c1\u3064\u3001\u3082\u3057\u304f\u306f\u8907\u6570\u5b58\u5728\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\uff081\u3064\u306eDNS\u306b\u5bfe\u3057\u8a31\u53ef\u3055\u308c\u308bSPF\u30ec\u30b3\u30fc\u30c9\u306f1\u3064\u307e\u3067\uff09<\/li>\n<li><strong>\u6700\u5927\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u6570<\/strong>\u2500\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u5408\u8a08\u56de\u6570\u3001\u307e\u305f10\u56de\u3092\u8d85\u3048\u3066\u3044\u306a\u3044\u304b\u3092\u78ba\u8a8d\uff08SPF\u30ec\u30b3\u30fc\u30c9\u306e\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u6570\u306f\u6700\u592710\u56de\u307e\u3067\uff09<\/li>\n<li><strong>PTR\u306e\u6709\u7121<\/strong>\u2500PTR\u306e\u6709\u7121\u3092\u78ba\u8a8d\uff08PTR\u306e\u4f7f\u7528\u306f\u975e\u63a8\u5968\uff09<\/li>\n<\/ol>\n<p>\u4ee3\u8868\u7684\u306a\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\u3068\u3057\u3066\u306f\u3001Dmarcian\u3001Agari\u3001Mimecast\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30b5\u30a4\u30d0\u30fc\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u30ea\u30b9\u30af\u306f\u5e74\u3005\u9ad8\u307e\u308a\u3001\u500b\u4eba\u306b\u3082\u4f01\u696d\u306b\u3082\u5f71\u97ff\u3092\u53ca\u307c\u3057\u3066\u3044\u307e\u3059\u3002\u5bfe\u7b56\u3068\u3057\u3066\u3001\u53ef\u80fd\u306a\u9650\u308a\u591a\u304f\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5c64\u3092\u5b9f\u88c5\u3057\u3001\u4fdd\u8b77\u3092\u5f37\u5316\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u30c7\u30fc\u30bf\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3001\u30b7\u30b9\u30c6\u30e0\u3092\u4fdd\u8b77\u3059\u308b\u305f\u3081\u3001\u3055\u307e\u3056\u307e\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6280\u8853\u3001\u30c4\u30fc\u30eb\u3001\u30b5\u30fc\u30d3\u30b9\u3092\u8ce2\u304f\u6d3b\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30c9\u30e1\u30a4\u30f3\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3068\u3001\u30b9\u30d1\u30e0\u696d\u8005\u306e\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u3092\u963b\u6b62\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30a2\u30bb\u30c3\u30c8\u3068\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u4fa1\u3092\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>SPF\u30ec\u30b3\u30fc\u30c9\u3060\u3051\u3067\u306f\u5341\u5206\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3001DKIM\u3068DMARC\u306e\u4f75\u7528\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u3053\u306e2\u3064\u306e\u4f75\u7528\u306b\u3088\u3063\u3066\u3001\u30e1\u30fc\u30eb\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u5165\u308a\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u306a\u3069\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3092\u52b9\u7387\u7684\u306b\u691c\u51fa\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001SPF\u30ec\u30b3\u30fc\u30c9\u3001DKIM\u3001DMARC\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3044\u3001SPF\u30ec\u30b3\u30fc\u30c9\u30c1\u30a7\u30c3\u30af\u30c4\u30fc\u30eb\u3067\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u52b9\u6027\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3092\u304a\u5fd8\u308c\u306a\u304f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SPF\uff08Sender 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