{"id":15135,"date":"2017-12-22T09:00:15","date_gmt":"2017-12-22T00:00:15","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=15135"},"modified":"2019-05-13T17:57:12","modified_gmt":"2019-05-13T08:57:12","slug":"authentication_of_mail_sending","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2017\/12\/22\/authentication_of_mail_sending\/","title":{"rendered":"\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u304a\u3051\u308b\u8a8d\u8a3c\u6280\u8853\u306b\u3064\u3044\u3066"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3002\u30a4\u30f3\u30d5\u30e9\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u4e95\u4e0a\u3067\u3059\u3002<br \/>\n\u3053\u308c\u306f <a href=\"\/blog\/2017\/11\/28\/techscore-advent-calendar-2017\/\">TECHSCORE Advent Calendar 2017<\/a>\u306e22\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u304a\u3051\u308b\u8a8d\u8a3c\u6280\u8853\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u73fe\u5728\u4e00\u822c\u7684\u3068\u3055\u308c\u308b\u6280\u8853\u306b\u8efd\u304f\u3060\u3051\u89e6\u308c\u3055\u305b\u3066\u3044\u305f\u3060\u3044\u305f\u4e0a\u3067\u3001\u6628\u4eca\u3001\u53d6\u308a\u5165\u308c\u3089\u308c\u306f\u3058\u3081\u3066\u3044\u308b\u8a8d\u8a3c\u6280\u8853\u306b\u3064\u3044\u3066\u66f8\u304b\u305b\u3066\u3044\u305f\u3060\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\n\u8a18\u4e8b\u4e2d\u3067\u89e6\u308c\u308b\u3082\u306e\u306f\u3001SPF\u3001DKIM\u3001DMARC\u3067\u3059\u304c\u3001SPF\u3068DKIM\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u306f\u8a18\u8f09\u3057\u3066\u304a\u308a\u307e\u305b\u3093\u306e\u3067\u3054\u4e86\u627f\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>SPF<\/h2>\n<p>\u307e\u305a\u3001\u6700\u521d\u306f<a href=\"https:\/\/www.getmailbird.com\/what-spf-resources-are-available-now-that-openspf-org-is-gone\/\" target=\"_blank\" rel=\"noopener noreferrer\">SPF(Sender Policy Framework)<\/a>\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u9001\u4fe1\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u78ba\u304b\u306b\u6b63\u3057\u3044\u9001\u4fe1\u8005\u306e\u3082\u306e\u3060\u3068\u3001\u9001\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u30c9\u30e1\u30a4\u30f3\u306eDNS\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u7528\u3044\u3066\u516c\u958b\u3059\u308b\u3082\u306e\u3067\u3059\u3002<br \/>\n\u3053\u306e\u516c\u958b\u60c5\u5831\u3092\u53c2\u7167\u3057\u3066\u3001\u53d7\u4fe1\u5074\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u306f\u5dee\u51fa\u4eba\u306e\u30e1\u30fc\u30eb\u306eFrom\uff08Header from\u306e\u30b1\u30fc\u30b9\u306e\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3057\u3001Envelope from\u306e\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\uff09\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u8a72\u5f53\u30ec\u30b3\u30fc\u30c9\u3068\u5b9f\u65bd\u306b\u9001\u4fe1\u3055\u308c\u305f\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9\u60c5\u5831\u3092\u6bd4\u8f03\u3057\u3001\u6b63\u3057\u3044\u9001\u4fe1\u8005\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u6750\u6599\u306b\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>DKIM<\/h2>\n<p>\u3064\u304e\u306f\u3001<a href=\"http:\/\/www.dkim.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">DKIM(DomainKeys Identified Mail)<\/a>\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u53d7\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u304c\u3001\u6b63\u898f\u306e\u9001\u4fe1\u8005\u304b\u3089\u9001\u4fe1\u3055\u308c\u305f\u30e1\u30fc\u30eb\u3067\u6539\u3056\u3093\u304c\u884c\u308f\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u308b\u96fb\u5b50\u7f72\u540d\u65b9\u5f0f\u306e\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u6280\u8853\u3067\u3059\u3002\u3053\u306e\u6280\u8853\u306b\u3088\u308a\u3001\u3069\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u9001\u4fe1\u3055\u308c\u305f\u304b\u3092\u53d7\u4fe1\u30b5\u30fc\u30d0\u5074\u3067\u306e\u691c\u8a3c\u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u6642\u306b\u79d8\u5bc6\u9375\u306b\u3088\u3063\u3066\u751f\u6210\u3057\u305f\u7f72\u540d\u60c5\u5831\u3092\u3001\u9001\u4fe1\u8005\u306e\u30c9\u30e1\u30a4\u30f3\u306eDNS\u30ec\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u516c\u958b\u9375\u3092\u4f7f\u3063\u3066\u691c\u8a3c\u3059\u308b\u3053\u3068\u3067\u3001\u6b63\u898f\u306e\u9001\u4fe1\u8005\u3067\u3042\u308b\u3053\u3068\u3068\u3001\u5185\u5bb9\u304c\u6539\u3056\u3093\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u691c\u8a3c\u3059\u308b\u3053\u3068\u3092\u53ef\u80fd\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>DMARC<\/h2>\n<p>\u305d\u3057\u3066\u3001\u6700\u5f8c\u306b<a href=\"https:\/\/dmarc.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">DMARC(Domain-based Message Authentication, Reporting &amp; Conformance)<\/a>\u3067\u3059\u3002DMARC\u3068\u3044\u3046\u6280\u8853\u306f\u30012017\u5e7412\u6708\u73fe\u5728\u3001\u65e5\u672c\u3067\u306f\u30e1\u30b8\u30e3\u30fc\u306a\u53d6\u308a\u6271\u3044\u3068\u306f\u306a\u3063\u3066\u3044\u307e\u305b\u3093\u304c\u3001<a href=\"https:\/\/dmarc.org\/2016\/06\/dmarc-required-for-uk-government-services-by-october-1st\/\" target=\"_blank\" rel=\"noopener noreferrer\">U.K.\u3067\u306f\u653f\u5e9c\u30b5\u30fc\u30d3\u30b9\u306b\u306f\u5fc5\u8981<\/a>\u3001<a href=\"https:\/\/dmarc.org\/2016\/08\/australian-government-agency-recommends-dmarc-dkim-and-spf\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u30aa\u30fc\u30b9\u30c8\u30e9\u30ea\u30a2\u653f\u5e9c\u306e\u63a8\u5968<\/a>\u3068\u3055\u308c\u3066\u304a\u308a\u3001\u76f4\u8fd1\u3067\u306f<a href=\"https:\/\/cyber.dhs.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\">DHS\uff08\u7c73\u56fd\u56fd\u571f\u5b89\u5168\u4fdd\u969c\u7701\uff09\u304cDMARC\u3092\u7fa9\u52d9\u5316<\/a>\uff082017\u5e7412\u6708\u78ba\u8a8d\uff09\u3057\u305f\u308a\u3068\u3001\u4e16\u754c\u7684\u306b\u5c0e\u5165\u3092\u907f\u3051\u3089\u308c\u306a\u3044\u6d41\u308c\u3068\u306a\u3063\u3066\u304d\u3066\u3044\u307e\u3059\u3002\u305d\u3053\u3067\u3001DMARC\u3092\u5c0e\u5165\u3059\u308b\u305f\u3081\u306e\u57fa\u790e\u3092\u7d39\u4ecb\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001DMARC\u3068\u3044\u3046\u6280\u8853\u306e\u5c0e\u5165\u306f\u56f0\u96e3\u304b\u3068\u3044\u3046\u554f\u3044\u306b\u3064\u3044\u3066\u3001\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u8005\u306e\u7acb\u5834\u3067\u3044\u3048\u3070\u3001\u6c7a\u3057\u3066\u56f0\u96e3\u3067\u306f\u306a\u3044\u3068\u8003\u3048\u307e\u3059\u3002\u4eca\u56de\u306e\u8a18\u4e8b\u306b\u304a\u3044\u3066\u3001\u524d\u6bb5\u3068\u3057\u3066SPF\u305d\u3057\u3066DKIM\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u8efd\u304f\u89e6\u308c\u305f\u306e\u306f\u3001\u3053\u308c\u306b\u95a2\u4fc2\u3057\u307e\u3059\u3002DMARC\u306f\u3001\u5358\u4e00\u306e\u8a8d\u8a3c\u6280\u8853\u3067\u6210\u308a\u7acb\u3064\u308f\u3051\u3067\u306f\u306a\u304f\u3001SPF\u3068DKIM\u306e2\u3064\u306e\u8a8d\u8a3c\u6280\u8853\u304c\u5c0e\u5165\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u5fc5\u9808\u8981\u4ef6\u3067\u3059\u3002\u305d\u3057\u3066\u3001\u3053\u306e\uff12\u3064\u306e\u8a8d\u8a3c\u6280\u8853\u3092\u7528\u3044\u3066\u9069\u5207\u3067\u306f\u306a\u3044\u3068\u53d7\u4fe1\u304c\u5224\u65ad\u3057\u305f\u5834\u5408\u3001\u53d7\u4fe1\u5074\u304c\u3069\u306e\u3088\u3046\u306a\u5bfe\u5fdc\u3092\u3059\u308b\u304b\u3068\u3044\u3046\u53d6\u308a\u6271\u3044\u3068\u30ec\u30dd\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u5148\u3092\u9001\u4fe1\u8005\u306e\u30c9\u30e1\u30a4\u30f3\u306eDNS\u30ec\u30b3\u30fc\u30c9\u3067\u5b9a\u7fa9\u3059\u308b\u4ed5\u7d44\u307f\u304cDMARC\u3068\u306a\u308a\u307e\u3059\u3002\u3067\u306f\u3001DNS\u30ec\u30b3\u30fc\u30c9\u306b\u3069\u306e\u3088\u3046\u306a\u5b9a\u7fa9\u3092\u3059\u308b\u306e\u304b\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u307e\u305a\u3001\u5f93\u6765\u306eSPF\/DKIM\u306b\u95a2\u3059\u308b\u5185\u5bb9\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u306f\u3001BIND\u306a\u3069\u306e\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u4e00\u4f8b\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u4eee\u306bexample.jp\u3068\u3044\u3046\u30c9\u30e1\u30a4\u30f3\u306e\u5834\u5408\u3067\u8003\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"lang:vim decode:true \">example.jp.              IN  MX 10   mail.example.jp. \nexample.jp.             IN  TXT \"v=spf1 mx ~all\" ; SPF\n20171222._domainkey.example.jp. IN  TXT \"v=DKIM1; k=rsa; \"\n        \"p=MIIBIjA\uff08\u30fb\u30fb\u30fb\u9593\u306e\u60c5\u5831\u306f\u7701\u7565\u30fb\u30fb\u30fb\u30fb\uff09SLWGrwIDAQAB\" ; DKIM public key\n_adsp._domainkey.example.jp.    IN  TXT ._domainkey.example.jp. IN  TXT ; no DKIM support.\nmail.example.jp.    IN  A   192.0.2.1<\/pre>\n<p>\u3053\u308c\u306f\u3001\u4e0a\u304b\u3089\u300cexample.jp\u306e\u53d7\u4fe1\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u306f\u512a\u5148\u5ea610\u306e\u5b9a\u7fa9\u3068\u3057\u3066mail.example.jp\u304c\u3044\u307e\u3059\u300d\u300cexample.jp\u306f\u53d7\u4fe1\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u3057\u304b\u30e1\u30fc\u30eb\u3092\u51fa\u3057\u307e\u305b\u3093(SPF)\u300d\u300cexample.jp\u306e\u30bb\u30ec\u30af\u30bf20171222\u306e\u516c\u958b\u9375\u306e\u5185\u5bb9\u306fp\u3067\u5b9a\u7fa9\u3055\u308c\u308b\u4e2d\u8eab\u3067\u3059\uff08DKIM)\u300d\u300cexample.jp\u30c9\u30e1\u30a4\u30f3\u306e\u30e1\u30fc\u30eb\u306e\u3044\u304f\u3064\u304b\u3001\u3082\u3057\u304f\u306f\u3059\u3079\u3066\u306bDKIM\u7f72\u540d\u304c\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u5ba3\u8a00\u3057\u307e\u3059\uff08DKIM)\u300d\u300cmail.example.jp\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f192.0.2.1\u3067\u3059\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001DMARC\u3067\u306fDNS\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u6b21\u306e\u3088\u3046\u306a\u5185\u5bb9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:vim decode:true\">_dmarc.example.jp. IN TXT \"v=DMARC1;p=none;sp=reject;ri=3600;rua=mailto:postmaster@example.jp;ruf=mailto:postmaster@example.jp\"\n\n<\/pre>\n<p>&nbsp;<\/p>\n<p>\u3053\u306e\u5ba3\u8a00\u306e\u610f\u5473\u306f\u3001\u300cv\u3067DMARC\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u5b9a\u7fa9\uff08\u73fe\u5728\u306f\uff11\u306e\u307f\uff09\u300d\u3001\u300cp\u306f\u8a72\u5f53\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306e\u53d6\u308a\u6271\u3044\u3092\u5b9a\u7fa9\u300d\u3001\u300csp\u306f\u8a72\u5f53\u30c9\u30e1\u30a4\u30f3\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306e\u53d6\u308a\u6271\u3044\u3092\u5b9a\u7fa9\u300d\u3001\u300cri\u306f\u30ec\u30dd\u30fc\u30c8\u3092\u53d7\u3051\u53d6\u308b\u9593\u9694\u3092\u79d2\u5b9a\u7fa9\u300d\u3001\u300crua\u3067\u306f\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u306e\u9001\u4fe1\u5148\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u300d\u3001\u300cruf\u3067\u306f\u8a8d\u8a3c\u5931\u6557\u306b\u95a2\u3059\u308b\u30ec\u30dd\u30fc\u30c6\u30a3\u30f3\u30b0\u5148\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u5b9a\u7fa9\u300d\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u3053\u3053\u3067\u8a8d\u8a3c\u306b\u5931\u6557\u3057\u305f\u30e1\u30fc\u30eb\u306e\u53d6\u308a\u6271\u3044\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b9a\u7fa9\u3067\u304d\u308b\u5024\u306e\u7a2e\u985e\u306f\uff13\u3064\u3067\u300cnone(\u306a\u306b\u3082\u3057\u306a\u3044\u3001\u69d8\u5b50\u898b\uff09\u300d\u300cquarantine\uff08\u9694\u96e2\u3057\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306a\u3069\u3078\u5165\u308c\u308b\uff09\u300d\u300creject(\u62d2\u5426\u3059\u308b\uff09\u300d\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\nDMARC\u5c0e\u5165\u5f53\u521d\u306fnone\u3092\u6307\u5b9a\u3057\u3001\u69d8\u5b50\u898b\u3092\u3057\u3064\u3064reject\u306b\u5909\u3048\u3066\u3044\u304f\u3068\u3044\u3046\u306e\u304c\u4e00\u822c\u7684\u306b\u591a\u3044\u30b1\u30fc\u30b9\u3067\u3059\uff08\u53d7\u3051\u53d6\u3063\u305f\u30ec\u30dd\u30fc\u30c8\u306e\u5185\u5bb9\u3092\u78ba\u8a8d\u3057\u3064\u3064\u3001\u5f90\u3005\u306b\u53b3\u3057\u304f\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\uff09\u3002<br \/>\n\u305d\u3057\u3066\u3001\u53d6\u308a\u6271\u3044\u65b9\u6cd5\u306e\u5b9a\u7fa9\u3092\u300creject\u300d\u3068\u3067\u304d\u305f\u5834\u5408\u3001\u6b63\u898f\u306e\u9001\u4fe1\u8005\u306b\u3068\u3063\u3066\u751f\u307e\u308c\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30e1\u30ea\u30c3\u30c8\u306f\u3001\u300c\u81ea\u8eab\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u8a9e\u3063\u305f\u8a50\u79f0\u30e1\u30fc\u30eb\u304c\u5404\u6240\u306b\u5c4a\u304f\u53ef\u80fd\u6027\u304c\u4f4e\u304f\u306a\u308b\u300d\u3001\u300c\u4fe1\u7528\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u3067\u306e\u307f\u30e1\u30fc\u30eb\u914d\u4fe1\u3092\u884c\u308f\u306a\u3044\u305f\u3081\u3001\u9001\u4fe1\u306b\u5229\u7528\u3059\u308bIP\u30a2\u30c9\u30ec\u30b9\u306e\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u9ad8\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u304b\u3089\u3001\u9069\u5207\u306a\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u898b\u8a08\u3089\u3063\u3066\u3001none\u304b\u3089\u79fb\u884c\u3057\u3066\u3044\u304f\u306e\u304c\u597d\u307e\u3057\u3044\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5404\u5024\u306a\u3069\u306e\u8a2d\u5b9a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f <a href=\"https:\/\/dmarc.org\/resources\/articles-tutorials-and-videos\/\" target=\"_blank\" rel=\"noopener noreferrer\">dmarc.org\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb<\/a> \u306b\u3066\u78ba\u8a8d\u3044\u305f\u3060\u304f\u306e\u304c\u9593\u9055\u3044\u306a\u3044\u3068\u8003\u3048\u307e\u3059\u3002<\/p>\n<h2>DMARC\u5b9f\u9a13\u4f53\u9a13\u306e\u5831\u544a<\/h2>\n<p>\u3053\u3053\u307e\u3067\u3001DMARC\u3068\u306f\u3069\u3046\u3044\u3063\u305f\u3082\u306e\u304b\u3068\u3044\u3046\u3053\u3068\u306b\u89e6\u308c\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u3044\u3056\u3001\u8a2d\u5b9a\u306a\u3069\u3092\u884c\u3044\u3001\u305d\u306e\u52d5\u4f5c\u3092\u3069\u306e\u3088\u3046\u306b\u78ba\u8a8d\u3059\u308b\u304b\u3068\u3044\u3046\u90e8\u5206\u306b\u89e6\u308c\u307e\u3059\u3002<br \/>\n\u3053\u3053\u3067\u79c1\u304c\u5b9f\u88c5\u3001\u8a66\u9a13\u3057\u305f\u5185\u5bb9\u3092\u4e00\u4f8b\u3068\u3057\u3066\u6982\u7565\u3060\u3051\u3092\u8a18\u8f09\u3057\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3001\u56fa\u5b9aIP\u3092\u6255\u3044\u51fa\u3057\u3066\u3044\u305f\u3060\u3051\u308bIaaS\u4e8b\u696d\u8005\u306e\u4eee\u60f3\u30b5\u30fc\u30d0\u3092\u501f\u308a\u3066\u3001CentOS 7+Postfix+OpenDKIM\u3067DKIM\u7f72\u540d\u3092\u3057\u305f\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u74b0\u5883\u3092\u4f5c\u308a\u307e\u3057\u305f\u3002<br \/>\n\uff08\u203b \u30b5\u30fc\u30d0\u306e\u5177\u4f53\u7684\u306a\u69cb\u7bc9\u65b9\u6cd5\u306f\u3001\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u89e6\u308c\u307e\u305b\u3093\u3002\uff09<\/p>\n<p>\u307e\u305f\u3001\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u304c\u6240\u6709\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u5207\u3089\u305a\u306b\u5229\u7528\u3057\u3001\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u306b\u3042\u308b\u3088\u3046\u306aDNS\u30ec\u30b3\u30fc\u30c9\u3092\u8a18\u8f09\u3057\u3001DMARC\u306e\u5ba3\u8a00\u307e\u3067\u7528\u610f\u3057\u307e\u3057\u305f\u3002<br \/>\n\u305d\u306e\u4e0a\u3067\u3001\u5b9f\u969b\u306b\u69cb\u7bc9\u3057\u305f\u30b5\u30fc\u30d0\u304b\u3089\u30e1\u30fc\u30eb\u3092\u51fa\u3057\u3066\u3001DMARC\u304c\u6b63\u5e38\u306b\u691c\u8a3c\u3057\u3066\u3044\u308b\u304b\u3092\u8a66\u3057\u307e\u3057\u305f\u3002\u4eca\u56de\u3001DMARC\u3092\u8a66\u3059\u305f\u3081\u306b\u5229\u7528\u3057\u305f\u5b9b\u5148\u306fGmail\u3067\u3057\u305f\u3002<br \/>\nGmail\u81ea\u8eab\u3082\u9001\u4fe1\u306e\u305f\u3081\u306bDMARC\u3092\u63a1\u7528\u3059\u308b\u65b9\u5411\u3092\u3068\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u53d7\u4fe1\u306b\u304a\u3044\u3066\u3082\u3001\u305d\u306e\u5185\u5bb9\u3092\u691c\u8a3c\u3057\u3001\u78ba\u8a8d\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u3001\u5b9f\u969b\u306b\u9001\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u3092Gmail\u3067\u958b\u304d\u3001\u300c\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30bd\u30fc\u30b9\u3092\u8868\u793a\u300d\u3068\u3057\u3066\u307f\u307e\u3059\u3002\u7d50\u679c\u306f\u6b21\u306e\u901a\u308a\u3067\u3057\u305f\u3002<\/p>\n<p><a href=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_pass_sample.jpg\" rel=\"facebox\" rel=\"attachment wp-att-15730\"><img loading=\"lazy\" class=\"alignnone wp-image-15730\" src=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_pass_sample-300x144.jpg\" alt=\"\" width=\"590\" height=\"283\" srcset=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_pass_sample-300x144.jpg 300w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_pass_sample-768x368.jpg 768w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_pass_sample-1024x491.jpg 1024w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_pass_sample.jpg 1032w\" sizes=\"(max-width: 590px) 100vw, 590px\" \/><\/a><\/p>\n<p>\u8868\u793a\u3055\u308c\u305f\u30bd\u30fc\u30b9\u306e\u753b\u9762\u306e\u4e0a\u90e8\u306b\u30e1\u30fc\u30eb\u306b\u95a2\u3059\u308b\u60c5\u5831\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u304c\u3001\u4e0b\uff13\u3064\u304c\u8a8d\u8a3c\u306e\u7d50\u679c\u3067\u3001SPF\u304cPASS\u3057\u3066\u3001DKIM\u3082PASS\u3057\u3066\u3001\u305d\u3057\u3066DMARC\u3082PASS\u3068\u78ba\u8a8d\u3055\u308c\u307e\u3057\u305f\u3002DMARC\u306b\u3064\u3044\u3066\u306fSPF\u3084DKIM\u5bfe\u5fdc\u304c\u3055\u308c\u3066\u3044\u3066\u3082\u3001\u5b9f\u969b\u306bDMARC\u304cDNS\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u306a\u3044\u3068\u9805\u76ee\u3082\u3067\u3066\u304d\u307e\u305b\u3093\u3002\u305d\u3046\u3044\u3063\u305f\u610f\u5473\u3067\u306f\u3001\u4eca\u56de\u69cb\u7bc9\u3057\u305f\u30b5\u30fc\u30d0\u306f\u6b63\u5e38\u306b\u8a8d\u8a3c\u3055\u308c\u305f\u3053\u3068\u304c\u8a3c\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u8a2d\u5b9a\u5f8c\u304b\u3089\u6570\u65e5\u7d4c\u904e\u3057\u305f\u5f8c\u306b\u3001\u79c1\u306e\u4fdd\u6709\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u8a9e\u3063\u305f\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u3042\u3063\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u308b\u30ec\u30dd\u30fc\u30c8\u304c\u5c4a\u3044\u305f\u3053\u3068\u3082\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u3092\u5b9a\u671f\u7684\u306b\u78ba\u8a8d\u3057\u306a\u304c\u3089\u3001\u81ea\u30c9\u30e1\u30a4\u30f3\u306e\u30dd\u30ea\u30b7\u30fc\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b\u52b9\u679c\u306b\u3064\u3044\u3066\u3082\u53ef\u80fd\u6027\u306b\u3064\u306a\u304c\u308b\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u8003\u3048\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_report.jpg\" rel=\"facebox\" rel=\"attachment wp-att-16044\"><img loading=\"lazy\" class=\"aligncenter wp-image-16044\" src=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_report.jpg\" alt=\"\" width=\"660\" height=\"264\" srcset=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_report.jpg 800w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_report-300x120.jpg 300w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/dmarc_report-768x307.jpg 768w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/a><\/p>\n<h2>\u00a0\u307e\u3068\u3081<\/h2>\n<p>\u6628\u4eca\u3001\u5927\u91cf\u306e\u8ff7\u60d1\u30e1\u30fc\u30eb\u304c\u767a\u4fe1\u3055\u308c\u3001\u9001\u308a\u4ed8\u3051\u3089\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u3053\u308c\u3092\u9632\u3050\u305f\u3081\u306e\u624b\u6bb5\u304c\u8003\u6848\u3055\u308c\u3001\u5b9f\u969b\u306e\u6280\u8853\u3068\u3057\u3066\u3001\u79c1\u305f\u3061\u3082\u5229\u7528\u304c\u53ef\u80fd\u306a\u72b6\u6cc1\u304c\u3084\u3063\u3066\u304d\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5bfe\u5fdc\u7b56\u306b\u3064\u3044\u3066\u3082\u3044\u3061\u65e9\u304f\u3001\u60c5\u5831\u3092\u30ad\u30e3\u30c3\u30c1\u30a2\u30c3\u30d7\u3057\u3066\u5bfe\u5fdc\u3057\u306a\u3044\u3068\u3001\u53d6\u308a\u6b8b\u3055\u308c\u305f\u969b\u306f\u3001\u6b63\u898f\u306e\u30e1\u30fc\u30eb\u3059\u3089\u53d7\u4fe1\u3057\u3066\u3082\u3089\u3048\u306a\u304f\u306a\u308b\u72b6\u6cc1\u304c\u751f\u307e\u308c\u304b\u306d\u306a\u3044\u3001\u305d\u3057\u3066\u3001\u65e5\u672c\u3067\u3082DMARC\u30ec\u30dd\u30fc\u30c8\u89e3\u6790\u30b5\u30fc\u30d3\u30b9\u306a\u3069\u3082\u898b\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u304d\u305f\u3053\u3068\u304b\u3089\u3001\u7c21\u6613\u306a\u90e8\u5206\u306e\u60c5\u5831\u306e\u767a\u4fe1\u3068\u3001\u5b9f\u969b\u306b\u74b0\u5883\u3092\u305f\u3081\u3057\u3066\u307f\u305f\u4f53\u9a13\u306e\u5831\u544a\u3092\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3002\u30a4\u30f3\u30d5\u30e9\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u4e95\u4e0a\u3067\u3059\u3002<br \/>\n\u3053\u308c\u306f TECHSCORE Advent Calendar 2017\u306e22\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<br \/><a href=\"https:\/\/www.techscore.com\/blog\/2017\/12\/22\/authentication_of_mail_sending\/\">\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":45,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[276,18],"tags":[141],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/15135"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/45"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=15135"}],"version-history":[{"count":57,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/15135\/revisions"}],"predecessor-version":[{"id":22555,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/15135\/revisions\/22555"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=15135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=15135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=15135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}