\u4eca\u65e5\u306e\u30c7\u30b8\u30bf\u30eb\u4e16\u754c\u306b\u304a\u3044\u3066\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306f\u96fb\u5b50\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u5b8c\u5168\u6027\u306b\u3068\u3063\u3066\u6975\u3081\u3066\u91cd\u8981\u3067\u3059\u3002\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e3\u672c\u67f1\u3067\u3042\u308bSPF\uff08Sender Policy Framework\uff09\u3001DKIM\uff08DomainKeys Identified Mail\uff09\u3001DMARC\uff08Domain-based Message Authentication, Reporting and Conformance\uff09\u306f\u3001\u30e1\u30fc\u30eb\u8a50\u6b3a\u3084\u30b9\u30d1\u30e0\u306b\u5bfe\u3059\u308b\u5f37\u56fa\u306a\u9632\u5fa1\u30b7\u30b9\u30c6\u30e0\u3092\u5f62\u6210\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30d6\u30ed\u30b0\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u6280\u8853\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u304b\u3001\u3069\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u3042\u308b\u306e\u304b\u3001\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308c\u3070\u30e1\u30fc\u30eb\u901a\u4fe1\u3092\u4fdd\u8b77\u3067\u304d\u308b\u306e\u304b\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
SPF\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u6240\u6709\u8005\u304c\u3001\u81ea\u5206\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u4ee3\u308f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u6a29\u9650\u3092\u6301\u3064\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u6c7a\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30b2\u30b9\u30c8\u30ea\u30b9\u30c8\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3057\u3001\u6a29\u9650\u306e\u306a\u3044\u4eba\u304c\u3042\u306a\u305f\u306e\u540d\u524d\u3067\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3067\u306f\u3001192.0.2.0\/24\u306e\u7bc4\u56f2\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068Google\u306eSPF\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e DKIM\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u771f\u6b63\u6027\u3068\u5b8c\u5168\u6027\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u30c7\u30b8\u30bf\u30eb\u7f72\u540d\u3092\u4f7f\u7528\u3059\u308b\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u65b9\u6cd5\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u304c\u5b9f\u969b\u306b\u6307\u5b9a\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u767a\u4fe1\u3055\u308c\u3001\u9001\u4fe1\u4e2d\u306b\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n DMARC\u306f\u3001SPF\u304a\u3088\u3073DKIM\u3092\u57fa\u790e\u3068\u3057\u3001\u3053\u308c\u3089\u306e\u8a8d\u8a3c\u65b9\u6cd5\u306b\u5931\u6557\u3057\u305f\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u51e6\u7406\u65b9\u6cd5\u3092\u6307\u5b9a\u3059\u308b\u30dd\u30ea\u30b7\u30fc\u3092\u8ffd\u52a0\u3059\u308b\u3002\u307e\u305f\u3001\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u3053\u3068\u3092\u30c9\u30e1\u30a4\u30f3\u6240\u6709\u8005\u306b\u77e5\u3089\u305b\u308b\u30ec\u30dd\u30fc\u30c8\u6a5f\u80fd\u3082\u63d0\u4f9b\u3059\u308b\u3002<\/p>\n \u3053\u306e\u30a8\u30f3\u30c8\u30ea\u306f\u3001SPF\u307e\u305f\u306fDKIM\u3092\u901a\u904e\u3057\u306a\u3044\u96fb\u5b50\u30e1\u30fc\u30eb\u3092\u9694\u96e2\u3057\u3001\u6307\u5b9a\u3055\u308c\u305f\u96fb\u5b50\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306b\u30ec\u30dd\u30fc\u30c8\u3092\u9001\u4fe1\u3059\u308b\u3088\u3046\u306b\u96fb\u5b50\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306b\u6307\u793a\u3057\u307e\u3059\u3002<\/p>\n \u3053\u308c\u3089\u306e\u8a8d\u8a3c\u65b9\u6cd5\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u306eDNS\u8a2d\u5b9a\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306e\u57fa\u672c\u7684\u306a\u624b\u9806\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n SPF\u3001DKIM\u3001DMARC\u306e\u5c0e\u5165\u306f\u8907\u96d1\u3067\u3059\u304c\u3001\u30e1\u30fc\u30eb\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u306f\u6b20\u304b\u305b\u307e\u305b\u3093\u3002IT\u306e\u5c02\u9580\u5bb6\u3001\u307e\u305f\u306f\u8cb4\u793e\u306e\u62c5\u5f53\u8005\u306b\u3054\u76f8\u8ac7\u3055\u308c\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002 \u30a6\u30a7\u30d6\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30d0\u30a4\u30c0<\/a> \u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n SPF\u3001DKIM\u3001DMARC\u306e\u52b9\u679c\u3092\u6700\u5927\u5316\u3059\u308b\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3046\u3079\u304d\u3067\u3042\u308b\uff1a<\/p>\n \u7d44\u7e54\u306e\u30e1\u30fc\u30eb\u30a4\u30f3\u30d5\u30e9\u306f\u3001\u6642\u9593\u306e\u7d4c\u904e\u3068\u3068\u3082\u306b\u5909\u5316\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5b9a\u671f\u7684\u306bSPF\u30ec\u30b3\u30fc\u30c9\u3092\u898b\u76f4\u3057\u3001\u66f4\u65b0\u3057\u3066\u3001\u65b0\u3057\u3044\u8a8d\u8a3c\u6e08\u307f\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3001\u53e4\u3044\u30b5\u30fc\u30d0\u30fc\u3092\u524a\u9664\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n DMARC\u306f\u3001\u5931\u6557\u3057\u305f\u8a8d\u8a3c\u8a66\u884c\u306b\u95a2\u3059\u308b\u8a73\u7d30\u306a\u30ec\u30dd\u30fc\u30c8\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30ec\u30dd\u30fc\u30c8\u3092\u5b9a\u671f\u7684\u306b\u5206\u6790\u3057\u3066\u6f5c\u5728\u7684\u306a\u8105\u5a01\u3092\u7279\u5b9a\u3057\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u30dd\u30ea\u30b7\u30fc\u3092\u8abf\u6574\u3057\u307e\u3059\u3002<\/p>\n \u307e\u305a\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u30de\u30a4\u30eb\u30c9\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u304b\u3089\u59cb\u3081\u3088\u3046\u3002 \u6280\u8853\u7684\u306a\u5bfe\u7b56\u304c\u4e07\u5168\u3067\u3042\u3063\u3066\u3082\u3001\u5f93\u696d\u54e1\u304c\u96fb\u5b50\u30e1\u30fc\u30eb\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3092\u53d7\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u305d\u306e\u4ed6\u306e\u96fb\u5b50\u30e1\u30fc\u30eb\u30d9\u30fc\u30b9\u306e\u653b\u6483\u306e\u5371\u967a\u6027\u306b\u3064\u3044\u3066\u3001\u30c1\u30fc\u30e0\u306b\u6ce8\u610f\u3092\u4fc3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n SPF\u3001DKIM\u304a\u3088\u3073DMARC\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u8a8d\u8a3c\u306e\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3042\u308b\u304c\u3001\u3053\u308c\u3089\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306b\u8003\u616e\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u8ab2\u984c\u304c\u3044\u304f\u3064\u304b\u3042\u308b\uff1a<\/p>\n \u6b63\u3057\u3044DNS\u30ec\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\u3068\u7dad\u6301\u306f\u3001\u7279\u306b\u591a\u6570\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3084\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u62b1\u3048\u308b\u7d44\u7e54\u306b\u3068\u3063\u3066\u306f\u8907\u96d1\u3067\u3059\u3002\u614e\u91cd\u306a\u8a08\u753b\u3068\u5b9a\u671f\u7684\u306a\u30c1\u30a7\u30c3\u30af\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n \u591a\u304f\u306e\u4f01\u696d\u306f\u3001\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u3001\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u3001\u305d\u306e\u4ed6\u306e\u30e1\u30fc\u30eb\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d3\u30b9\u3082SPF\u3001DKIM\u3001DMARC\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3001\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n DMARC\u30ec\u30dd\u30fc\u30c8\u3092\u5e38\u306b\u76e3\u8996\u3057\u3001\u30dd\u30ea\u30b7\u30fc\u3092\u9069\u5fdc\u3055\u305b\u308b\u306b\u306f\u6642\u9593\u3068\u30ea\u30bd\u30fc\u30b9\u304c\u304b\u304b\u308b\u3002\u6709\u52b9\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u4f01\u696d\u304c\u7d99\u7d9a\u7684\u306b\u6295\u8cc7\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n SPF\u3001DKIM\u3001DMARC\u306e\u5b9f\u88c5\u3068\u7ba1\u7406\u306b\u5f79\u7acb\u3064\u3055\u307e\u3056\u307e\u306a\u30c4\u30fc\u30eb\u3084\u30b5\u30fc\u30d3\u30b9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n 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