{"id":19881,"date":"2026-06-10T18:21:38","date_gmt":"2026-06-10T16:21:38","guid":{"rendered":"https:\/\/webhosting.de\/mailserver-dkim-alignment-dmarc-enforcement-sicherheit-shield\/"},"modified":"2026-06-10T18:21:38","modified_gmt":"2026-06-10T16:21:38","slug":"%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-dkim-%e3%82%a2%e3%83%a9%e3%82%a4%e3%83%a1%e3%83%b3%e3%83%88-dmarc-%e3%82%a8%e3%83%b3%e3%83%95%e3%82%a9%e3%83%bc%e3%82%b9%e3%83%a1","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/mailserver-dkim-alignment-dmarc-enforcement-sicherheit-shield\/","title":{"rendered":"\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u9069\u5207\u306b\u4fdd\u8b77DKIM\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068DMARC\u30a8\u30f3\u30d5\u30a9\u30fc\u30b9\u30e1\u30f3\u30c8\u306b\u3088\u308b\u6700\u5927\u9650\u306e\u30e1\u30fc\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3"},"content":{"rendered":"<p>\u79c1\u306f\u4e00\u8cab\u3057\u3066\u3001\u6b21\u306e\u65b9\u6cd5\u3067\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u4fdd\u8b77\u3057\u3066\u3044\u308b\u3002 <strong>dkim\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8 dmarc<\/strong> \u3092\u304d\u308c\u3044\u306b\u3057\u3001\u5f90\u3005\u306b\u30dd\u30ea\u30b7\u30fc\u3092\u5b9f\u884c\u306b\u79fb\u3057\u307e\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u60aa\u7528\u3055\u308c\u305f\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3092\u78ba\u5b9f\u306b\u9632\u304e\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3092\u9632\u304e\u3001\u6b63\u5f53\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u914d\u4fe1\u6027\u3092\u76ee\u306b\u898b\u3048\u308b\u5f62\u3067\u5f37\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/strong> DKIM\/SPF \u3092 From \u30c9\u30e1\u30a4\u30f3\u306b\u9069\u7528\u3059\u308b\u3002<\/li>\n  <li><strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u4e0d\u6b63\u30c1\u30a7\u30c3\u30af\u3092\u5f37\u5236\u7684\u306b\u51e6\u7406\u3059\u308b<\/li>\n  <li><strong>\u65bd\u884c<\/strong> \u306a\u3057 \u2192 \u9694\u96e2 \u2192 \u62d2\u5426 \u3068\u6bb5\u968e\u7684\u306b\u884c\u308f\u308c\u308b\u3002<\/li>\n  <li><strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u8ee2\u9001\u4e2d\u3082\u4fe1\u983c\u6027\u3092\u7dad\u6301<\/li>\n  <li><strong>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/strong> DMARC\u30ec\u30dd\u30fc\u30c8\u306b\u95a2\u3059\u308b\u30ae\u30e3\u30c3\u30d7<\/li>\n<\/ul>\n\n<h2>DKIM\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068DMARC\u30a8\u30f3\u30d5\u30a9\u30fc\u30b9\u30e1\u30f3\u30c8\u304c\u4e00\u7dd2\u306b\u306a\u308b\u7406\u7531<\/h2>\n\n<p>\u6280\u8853\u7684\u306a\u9001\u4fe1\u8005\u8a8d\u8a3c\u306f <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u3068SPF\u306eFrom\u30c9\u30e1\u30a4\u30f3\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u8ab0\u3082\u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u507d\u9020\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002DMARC\u306f\u3053\u306e\u305f\u3081\u306e\u660e\u78ba\u306a\u30eb\u30fc\u30eb\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\uff1a2\u3064\u306e\u30c1\u30a7\u30c3\u30af\u306e\u3069\u3061\u3089\u3082\u9069\u5207\u306a\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3067\u30d1\u30b9\u3057\u306a\u3044\u5834\u5408\u3001\u30dd\u30ea\u30b7\u30fc\u306f\u6709\u52b9\u306b\u306a\u308b\u3002\u3053\u306e\u7d50\u5408\u306b\u3088\u308a\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u6b63\u3057\u304f\u7f72\u540d\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u304c\u507d\u88c5\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u308b\u306e\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u7279\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306fSPF\u3092\u7834\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u4e00\u65b9\u3001DKIM\u306f\u305d\u306e\u307e\u307e\u3067\u3001ID\u3092\u5f15\u304d\u7d99\u3050\u3002\u3057\u305f\u304c\u3063\u3066\u79c1\u306f\u3001\u5c11\u306a\u304f\u3068\u30821\u3064\u306e\u6574\u5217\u3055\u308c\u305f\u624b\u7d9a\u304d\u304c\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4fdd\u8b77\u3059\u308b\u3088\u3046\u306b\u3001\u3059\u3079\u3066\u306e\u5b9f\u88c5\u3092\u8a08\u753b\u3059\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/emailsicherheit-dkim-dmarc-7423.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306e\u6280\u8853\u7684\u306a\u4ed5\u7d44\u307f<\/h2>\n\n<p>DKIM\u30d8\u30c3\u30c0\u30fc\u3067\u306f\u3001d=\u30bf\u30b0\u306e\u30c9\u30e1\u30a4\u30f3\u3068\u53ef\u8996\u30c9\u30e1\u30a4\u30f3\u3068\u3092\u6bd4\u8f03\u3059\u308b\u3002 <strong>\u3088\u308a<\/strong>-\u30c9\u30e1\u30a4\u30f3\u3002\u30b9\u30c8\u30ea\u30af\u30c8\u30fb\u30e2\u30fc\u30c9\u3067\u306f\u3001\u4e21\u8005\u306f\u307e\u3063\u305f\u304f\u540c\u3058\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u30ea\u30e9\u30c3\u30af\u30b9\u30fb\u30e2\u30fc\u30c9\u3067\u306f\u3001\u5171\u901a\u306e\u7d44\u7e54\u30c9\u30e1\u30a4\u30f3\u3067\u5341\u5206\u3067\u3042\u308b\u3002SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306f\u4e26\u884c\u3057\u3066\u5b58\u5728\u3057\u3001\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u30d5\u30ed\u30fc\/\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u306e\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3059\u308b\u3002DMARC\u306f\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u4ed8\u304dDKIM\u304c\u5b58\u5728\u3059\u308b\u304b\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u4ed8\u304dSPF\u304c\u9069\u7528\u3055\u308c\u308b\u304b\u306e\u3069\u3061\u3089\u304b\u3067\u3042\u308c\u3070\u3001\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u5165\u308c\u308b\u3002\u79c1\u306f\u3001\u914d\u9001\u30eb\u30fc\u30c8\u3068\u8ee2\u9001\u306e\u8a31\u5bb9\u7bc4\u56f2\u3092\u4f5c\u308b\u305f\u3081\u306b\u3001\u4e21\u65b9\u306e\u8a31\u5bb9\u7bc4\u56f2\u306b\u52aa\u3081\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u30b9\u30c6\u30c3\u30d7\u30fb\u30d0\u30a4\u30fb\u30b9\u30c6\u30c3\u30d7\u3067DMARC\u3092\u5b9f\u65bd\u3059\u308b<\/h2>\n\n<p>p=none\u304b\u3089\u59cb\u3081\u3066\u3001\u6b21\u306e\u3088\u3046\u306b\u8a55\u4fa1\u3059\u308b\u3002 <strong>\u30ec\u30dd\u30fc\u30c8<\/strong> \u3092\u4f7f\u7528\u3057\u3066\u3001\u3059\u3079\u3066\u306e\u6b63\u5f53\u306a\u9001\u4fe1\u5143\u3092\u30ad\u30e3\u30d7\u30c1\u30e3\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u30c4\u30fc\u30eb\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d0\u30fc\u3092\u542b\u3080\u5404\u9001\u4fe1\u5143\u306b\u3064\u3044\u3066\u3001SPF\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3057\u3001DKIM\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u30d2\u30c3\u30c8\u7387\u304c\u6b63\u3057\u3051\u308c\u3070\u3001p=quarantine\u306b\u5207\u308a\u66ff\u3048\u3001\u62d2\u5426\u306e\u30ea\u30b9\u30af\u3092\u5192\u3055\u305a\u306b\u30a8\u30e9\u30fc\u3092\u53ef\u8996\u5316\u3057\u307e\u3059\u3002\u4fee\u6b63\u5f8c\u3001\u79c1\u306fp=reject\u306b\u5207\u308a\u66ff\u3048\u3001\u4e00\u8cab\u3057\u3066\u507d\u9020\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3002SPF\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u30dd\u30ea\u30b7\u30fc\u306e\u8a73\u7d30\u3092\u304a\u77e5\u308a\u306b\u306a\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u306e\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u30b5\u30a4\u30c8\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-spf-%e3%82%a2%e3%83%a9%e3%82%a4%e3%83%a1%e3%83%b3%e3%83%88-dmarc-%e3%83%9d%e3%83%aa%e3%82%b7%e3%83%bc%e3%82%ac%e3%82%a4%e3%83%89\/\">SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30ac\u30a4\u30c9<\/a> \u6982\u8981\u3092\u88dc\u8db3\u3059\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/mailserver_sicheren_4321.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>DKIM\u306f\u914d\u4fe1\u53ef\u80fd\u6027\u3092\u78ba\u5b9f\u306b\u30b5\u30dd\u30fc\u30c8\u3059\u308b<\/h2>\n\n<p>\u5b9f\u969b\u306b\u306f\u3001\u79c1\u306f\u7279\u306b\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u3092\u983c\u308a\u306b\u3057\u3066\u3044\u308b\u3002 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>, \u306a\u305c\u306a\u3089\u3001\u7f72\u540d\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u3068\u91cd\u8981\u306a\u30d8\u30c3\u30c0\u30fc\u3092\u4fdd\u8b77\u3059\u308b\u304b\u3089\u3067\u3042\u308b\u3002\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306b\u3088\u3063\u3066\u9001\u4fe1\u5143IP\u3084\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u304c\u5909\u66f4\u3055\u308c\u308b\u3053\u3068\u306f\u3088\u304f\u3042\u308b\u304c\u3001\u7f72\u540d\u306f\u6709\u52b9\u306a\u307e\u307e\u3067\u3042\u308b\u3002\u5927\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3067\u306f\u3001\u6b63\u3057\u3044DKIM\u306e\u5b9f\u88c5\u304c\u76ee\u306b\u898b\u3048\u3066\u597d\u307e\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001DKIM\u304c\u6b63\u3057\u304f\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u53d7\u4fe1\u7bb1\u306b\u5c4a\u304f\u53ef\u80fd\u6027\u304c\u9ad8\u304f\u306a\u308a\u3001\u6b63\u3057\u304f\u5b9f\u88c5\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u3059\u3050\u306b\u53d7\u4fe1\u7bb1\u306b\u5c4a\u304b\u306a\u3044\u3002\u81ea\u5206\u306e\u30d6\u30e9\u30f3\u30c9\u3092\u5b88\u308a\u305f\u3044\u306e\u3067\u3042\u308c\u3070\u3001From\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3059\u308bDKIM\u30c9\u30e1\u30a4\u30f3\u3092\u4e00\u8cab\u3057\u3066\u9078\u629e\u3059\u3079\u304d\u3067\u3042\u308b\u3002.<\/p>\n\n<h2>\u5b9f\u8df5\uff1aDKIM\u3068DMARC\u30ec\u30b3\u30fc\u30c9\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b<\/h2>\n\n<p>\u9001\u4fe1\u5074\u306e\u30b7\u30b9\u30c6\u30e0\u3067DKIM\u30ad\u30fc\u30fb\u30da\u30a2\u3092\u751f\u6210\u3057\u3001\u516c\u958b\u30ad\u30fc\u3092TXT\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u516c\u958b\u3059\u308b\u3002 <strong>v=DKIM1<\/strong>, k=rsa\u3068p=\u5024\u3002\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3067\u7f72\u540d\u3092\u6709\u52b9\u306b\u3057\u3001d=\u30c9\u30e1\u30a4\u30f3\u304c\u76ee\u306b\u898b\u3048\u308bFrom\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002DMARC\u30ec\u30b3\u30fc\u30c9\u3092_dmarc.mydomain.tld\u306e\u4e0b\u306bTXT\u3068\u3057\u3066\u4f5c\u6210\u3057\u3001v=DMARC1\u3001policy p\u3001adkim\/aspf\u3001rua\/ruf\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u53b3\u5bc6\u306a\u5236\u5fa1\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u5f8c\u3067p=reject\u3001adkim=s\u3001\u7591\u308f\u3057\u3044\u5834\u5408\u306b\u306faspf=r\u3092\u79fb\u884c\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3002\u5404\u5909\u66f4\u306e\u5f8c\u3001\u79c1\u306fDNS\u306e\u8a55\u4fa1\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u6700\u521d\u306e\u30ec\u30dd\u30fc\u30c8\u3092\u6ce8\u610f\u6df1\u304f\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/mailserver-security-dkim-dmarc-3298.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30fb\u30e2\u30fc\u30c9\u3068\u653f\u7b56\u52b9\u679c\u306e\u6bd4\u8f03<\/h2>\n\n<p>\u30ea\u30e9\u30c3\u30af\u30b9\u3068\u30b9\u30c8\u30ea\u30af\u30c8\u3092\u610f\u8b58\u7684\u306b\u4f7f\u3044\u5206\u3051\u308b <strong>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/strong>, \u3068\u3044\u3046\u306e\u3082\u3001\u5404\u74b0\u5883\u3067\u4f7f\u7528\u3055\u308c\u308b\u9001\u4fe1\u8005\u30d1\u30b9\u304c\u7570\u306a\u308b\u304b\u3089\u3067\u3042\u308b\u3002\u6b21\u306e\u8868\u306f\u3001\u305d\u306e\u9055\u3044\u3068\u30a8\u30f3\u30d5\u30a9\u30fc\u30b9\u30e1\u30f3\u30c8\u306b\u5207\u308a\u66ff\u3048\u308b\u305f\u3081\u306e\u30d2\u30f3\u30c8\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u660e\u78ba\u306a\u30eb\u30fc\u30eb\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u8aa4\u691c\u77e5\u3092\u6e1b\u3089\u3057\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u3092\u30af\u30ea\u30fc\u30f3\u306b\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u79c1\u306f\u3001\u30b9\u30bf\u30fc\u30c8\u30a2\u30c3\u30d7\u6bb5\u968e\u3067\u306frelaxed\u3092\u4f7f\u7528\u3057\u3001\u305d\u306e\u5f8c\u5fc5\u8981\u306b\u5fdc\u3058\u3066strict\u306b\u5207\u308a\u66ff\u3048\u3066\u3044\u307e\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u5c55\u958b\u8a08\u753b\u3092\u7acb\u3066\u3001\u78ba\u5b9f\u306b\u914d\u4fe1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30a2\u30b9\u30da\u30af\u30c8<\/th>\n      <th>DKIM strict (adkim=s)<\/th>\n      <th>DKIM\u30ea\u30e9\u30c3\u30af\u30b9 (adkim=r)<\/th>\n      <th>\u5b9f\u8df5\u7de8<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u30c9\u30e1\u30a4\u30f3\u6bd4\u8f03<\/td>\n      <td><strong>\u6b63\u78ba<\/strong> \u540c\u4e00<\/td>\n      <td>\u540c\u3058\u7d44\u7e54\u306e\u30c9\u30e1\u30a4\u30f3<\/td>\n      <td>\u30b9\u30c8\u30ea\u30af\u30c8\u306f\u60aa\u7528\u306b\u5bfe\u3059\u308b\u6700\u5f37\u306e\u30d7\u30ed\u30c6\u30af\u30b7\u30e7\u30f3<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3<\/td>\n      <td>\u81ea\u52d5\u30ab\u30d0\u30fc\u306a\u3057<\/td>\n      <td>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u304c\u9069\u3057\u3066\u3044\u308b<\/td>\n      <td>\u8907\u6570\u306e\u9001\u4fe1\u8005\u3092\u7c21\u7d20\u5316<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30d5\u30a9\u30fc\u30eb\u30c8\u30fb\u30c8\u30ec\u30e9\u30f3\u30b9<\/td>\n      <td>\u4f4e\u3044<\/td>\n      <td><strong>\u3088\u308a\u9ad8\u3044<\/strong><\/td>\n      <td>\u30b9\u30bf\u30fc\u30c8\u30a2\u30c3\u30d7\u6bb5\u968e\u3067\u306f\u3057\u3070\u3057\u3070\u30ea\u30e9\u30c3\u30af\u30b9<\/td>\n    <\/tr>\n    <tr>\n      <td>DMARC\u30dd\u30ea\u30b7\u30fc<\/td>\n      <td>p=\u826f\u597d\u306a\u8010\u8377\u91cd\u6027\u3092\u62d2\u5426\u3059\u308b<\/td>\n      <td>p=\u4e2d\u9593\u6bb5\u968e\u3068\u3057\u3066\u306e\u691c\u75ab<\/td>\n      <td>\u5831\u544a\u66f8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u7de0\u3081\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>\u914d\u9054\u53ef\u80fd\u6027<\/td>\n      <td>\u53d7\u4fe1\u8005\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u308f\u304b\u308a\u3084\u3059\u3044<\/td>\n      <td>\u3088\u308a\u67d4\u8edf\u306a\u30d5\u30a9\u30ef\u30fc\u30c7\u30a3\u30f3\u30b0<\/td>\n      <td>SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u7d44\u307f\u5408\u308f\u305b\u308b<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\uff1a\u5831\u544a\u66f8\u3092\u6b63\u3057\u304f\u8aad\u307f\u3001\u305d\u308c\u306b\u5f93\u3063\u3066\u884c\u52d5\u3059\u308b<\/h2>\n\n<p>\u96c6\u7d04\u3055\u308c\u305f\u3082\u306e\u3092\u8a55\u4fa1\u3059\u308b <strong>\uff24\uff2d\uff21\uff32\uff23<\/strong>-\u3092\u5b9a\u671f\u7684\u306b\u5831\u544a\u3057\u3001\u65b0\u3057\u3044\u9001\u4fe1\u5143\u3084\u8a2d\u5b9a\u30df\u30b9\u3092\u8a8d\u8b58\u3057\u307e\u3059\u3002\u76ee\u7acb\u3064IP\u3001DKIM\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u6b20\u843d\u3001SPF\u9055\u53cd\u306f\u3059\u3050\u306b\u7279\u5b9a\u3067\u304d\u308b\u3002\u305d\u308c\u305e\u308c\u306e\u5909\u66f4\u5f8c\u3001\u5c11\u306a\u304f\u3068\u30822\u9031\u9593\u306f\u30ab\u30fc\u30d6\u3092\u76e3\u8996\u3059\u308b\u3002\u6570\u500b\u306e\u7570\u5e38\u5024\u304c\u6b8b\u308b\u3060\u3051\u306a\u3089\u3001\u30dd\u30ea\u30b7\u30fc\u3092\u53b3\u3057\u304f\u3057\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u5e38\u306b\u76e3\u8996\u3059\u308b\u3053\u3068\u3067\u3001\u653b\u6483\u3092\u53ef\u8996\u5316\u3057\u3001\u6e2c\u5b9a\u53ef\u80fd\u306a\u65b9\u6cd5\u3067\u30d6\u30e9\u30f3\u30c9\u3092\u4fdd\u8b77\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/MailserverSicherheit3587.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u8ee2\u9001\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4<\/h2>\n\n<p>SPF\u306f\u3057\u3070\u3057\u3070\u5916\u90e8\u30ea\u30ec\u30fc\u3067\u58ca\u308c\u308b\u306e\u3067\u3001\u79c1\u306f\u8ee2\u9001\u30eb\u30fc\u30eb\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u3002 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong> \u304c\u6551\u4e16\u4e3b\u3068\u306a\u308b\u3002\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u306f\u3001\u4ef6\u540d\u3092\u5909\u66f4\u3057\u305f\u308a\u3001\u30d5\u30c3\u30bf\u30fc\u3092\u633f\u5165\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u3001DKIM\u306e\u6b63\u898f\u5316\u304c\u5f31\u3044\u3053\u3068\u3092\u30c6\u30b9\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002PDF\u30d5\u30a1\u30c3\u30af\u30b9\u3084CRM\u30a4\u30d9\u30f3\u30c8\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306b\u306f\u3001\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u3068\u4e00\u81f4\u3057\u305f\u72ec\u81ea\u306eDKIM\u7f72\u540d\u304c\u5fc5\u8981\u3060\u3002\u3053\u308c\u304c\u3046\u307e\u304f\u3044\u304b\u306a\u3044\u5834\u5408\u306f\u3001\u660e\u78ba\u306a\u30dd\u30ea\u30b7\u30fc\u3092\u6301\u3064\u5c02\u7528\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u3046\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30b7\u30b0\u30cd\u30c1\u30e3\u30c1\u30a7\u30fc\u30f3\u3092\u7dad\u6301\u3057\u3001\u8aa4\u5831\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>SMTP\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u7dcf\u5408\u7684\u306b\u8003\u3048\u308b<\/h2>\n\n<p>\u30b3\u30f3\u30d0\u30a4\u30f3 <strong>\u30c6\u30a3\u30fc\u30a8\u30eb\u30a8\u30b9<\/strong> \u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306e\u6697\u53f7\u5316\u3001\u30b9\u30d1\u30e0\u30d1\u30bf\u30fc\u30f3\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u30d5\u30a3\u30eb\u30bf\u30fc\u3001SPF\u3001DKIM\u3001DMARC\u306b\u3088\u308b\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3002\u3053\u308c\u3089\u306e\u30ec\u30a4\u30e4\u30fc\u306f\u9023\u643a\u3057\u3001\u500b\u3005\u306e\u5bfe\u7b56\u306b\u3088\u3063\u3066\u7a7a\u3044\u305f\u30ae\u30e3\u30c3\u30d7\u3092\u57cb\u3081\u308b\u3002\u305f\u3068\u3048\u8ab0\u304b\u304c\u5371\u967a\u306aIP\u7d4c\u7531\u3067\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u305f\u3068\u3057\u3066\u3082\u3001DMARC\u306f\u9069\u5207\u306a\u914d\u7f6e\u3067\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u963b\u6b62\u3059\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u30af\u30ea\u30fc\u30f3\u306aDNS\u30a8\u30f3\u30c8\u30ea\u3001\u4e00\u8cab\u3057\u305f\u9001\u4fe1\u8005\u30d1\u30b9\u3001\u7d99\u7d9a\u7684\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306b\u96c6\u4e2d\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u30b5\u30dd\u30fc\u30c8\u6848\u4ef6\u304c\u6e1b\u5c11\u3057\u3001\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u914d\u4fe1\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/mailserver_sicherheit_4623.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u7f72\u540d\u306e\u5b89\u5b9a\u6027\u3068DKIM\u306e\u6b63\u898f\u5316<\/h2>\n\n<p>\u3092\u9078\u3076\u3002 <strong>\u6b63\u898f\u5316<\/strong> \u901a\u5e38\u306e\u30d8\u30c3\u30c0\u30fc\u3084\u7a7a\u767d\u306e\u5909\u66f4\u304c\u7f72\u540d\u3092\u7121\u52b9\u306b\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3042\u308b\u3002\u591a\u304f\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u306f\u3001relaxed\/relaxed\u304c strict\/strict\u3088\u308a\u3082\u9069\u3057\u3066\u3044\u308b\u3002\u540c\u6642\u306b\u3001\u771f\u6b63\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3001\u30b9\u30b3\u30fc\u30d7\u3092\u5e83\u3052\u3059\u304e\u3066\u306f\u306a\u3089\u306a\u3044\u3002\u3053\u306e\u30c8\u30d4\u30c3\u30af\u3092\u3088\u308a\u6df1\u304f\u6398\u308a\u4e0b\u3052\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u30b5\u30a4\u30c8\u3092\u53c2\u7167\u3055\u308c\u305f\u3044\u3002 <a href=\"https:\/\/webhosting.de\/ja\/dkim-%e6%ad%a3%e8%a6%8f%e5%8c%96-%e7%bd%b2%e5%90%8d-%e5%ae%89%e5%ae%9a%e6%80%a7-%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc-%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3\/\">DKIM\u306e\u6b63\u898f\u5316<\/a> \u30b7\u30b0\u30cd\u30c1\u30e3\u30fc\u306e\u5b89\u5b9a\u6027\u306b\u95a2\u3059\u308b\u5b9f\u8df5\u7684\u306a\u30d2\u30f3\u30c8\u3002\u79c1\u306f\u30dd\u30ea\u30b7\u30fc\u3092\u5f37\u5316\u3059\u308b\u524d\u306b\u3001\u5b9f\u969b\u306e\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30d1\u30b9\u3092\u4f7f\u3063\u3066\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u30c6\u30b9\u30c8\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>Plesk\u3068\u30b3\u30e2\u30f3\u30d1\u30cd\u30eb\u3067\u306e\u8a2d\u5b9a<\/h2>\n\n<p>\u79c1\u306f\u7ba1\u7406\u30d1\u30cd\u30eb\u3092\u4f7f\u3063\u3066\u6b21\u306e\u3053\u3068\u3092\u884c\u3063\u3066\u3044\u308b\u3002 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>-\u30ad\u30fc\u3092\u4f7f\u3063\u3066DNS\u30ec\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3059\u308b\u3068\u4fbf\u5229\u3067\u3042\u308b\u3002\u591a\u304f\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u3084\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3054\u3068\u306b\u6b63\u3057\u3044\u30bb\u30ec\u30af\u30bf\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002CRM\u3001\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u6df7\u5728\u3059\u308b\u74b0\u5883\u3067\u306f\u3001\u79c1\u306f\u30bb\u30ec\u30af\u30bf\u30d9\u30fc\u30b9\u3067\u5206\u3051\u3066\u3044\u308b\u306e\u3067\u3001\u3059\u3079\u3066\u306b\u89e6\u308c\u308b\u3053\u3068\u306a\u304f\u30ad\u30fc\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u7c21\u5358\u306a\u7d39\u4ecb\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a <a href=\"https:\/\/webhosting.de\/ja\/spf-dkim-dmarc-plesk-%e3%82%ac%e3%82%a4%e3%83%89-%e5%ae%89%e5%85%a8-%e3%83%81%e3%83%a5%e3%83%bc%e3%83%8b%e3%83%b3%e3%82%b0-%e3%83%97%e3%83%ad%e3%83%95%e3%82%a7%e3%83%83%e3%82%b7%e3%83%a7%e3%83%8a\/\">Plesk\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7<\/a> \u4fbf\u5229\u306a\u30ac\u30a4\u30c9\u3067\u3059\u3002\u305d\u306e\u5f8c\u3001\u30ed\u30b0\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u5927\u304d\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3078\u306e\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3067\u52b9\u679c\u3092\u78ba\u8a8d\u3059\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/mailserver-sicherheit-4829.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30d9\u30b9\u30c8\u30fb\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u30fb\u30b3\u30f3\u30d1\u30af\u30c8<\/h2>\n\n<p>\u79c1\u306f\u3053\u3046\u8003\u3048\u308b <strong>SPF<\/strong>, DKIM\u3068DMARC\u306f\u5e38\u306b\u9023\u643a\u3057\u3001\u30ec\u30b3\u30fc\u30c9\u9593\u306e\u77db\u76fe\u3092\u9632\u3050\u3002\u65b0\u3057\u3044\u9001\u4fe1\u5143\u3092\u3059\u3050\u306b\u6587\u66f8\u5316\u3057\u3001\u9069\u5207\u306a\u30bb\u30ec\u30af\u30bf\u3068\u30ea\u30f3\u30af\u3055\u305b\u308b\u3002\u4e88\u6e2c\u53ef\u80fd\u306a\u65b9\u6cd5\u3067\u30ad\u30fc\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3057\u3001\u9577\u3055\u3092\u6700\u65b0\u306b\u4fdd\u3064\u3002\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u306e\u969b\u306f\u3001\u7de9\u548c\u7684\u306b\u59cb\u3081\u3066\u30c7\u30fc\u30bf\u3092\u53ce\u96c6\u3057\u3001\u5f8c\u3067\u9001\u4fe1\u8005\u30eb\u30fc\u30c8\u304c\u660e\u78ba\u306b\u306a\u3063\u305f\u6642\u70b9\u3067\u53b3\u683c\u306b\u5207\u308a\u66ff\u3048\u307e\u3059\u3002\u5024\u304c\u5b89\u5b9a\u3059\u308b\u307e\u3067\u3001\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u76e3\u8996\u3059\u308b\u3002.<\/p>\n\n<h2>SPF\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306e\u8a73\u7d30\u3068\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306e\u305f\u3081\u306eSRS<\/h2>\n<p>SPF\u3067\u306f\u3001MailFrom\/\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u306e\u30c9\u30e1\u30a4\u30f3\u3068HELO\/EHLO\u306eID\u3092\u533a\u5225\u3059\u308b\u3002MailFrom\u30c9\u30e1\u30a4\u30f3\u306fDMARC\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306b\u30ab\u30a6\u30f3\u30c8\u3055\u308c\u308b\u3002\u3053\u308c\u304c\u5931\u6557\u3059\u308b\u3068\u3001\u4e00\u81f4\u3059\u308bHELO\u306fSPF\u3092\u4fdd\u5b58\u3067\u304d\u308b\u304c\u3001DMARC\u306b\u5f93\u3063\u3066\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u306fenvelope-from\u30c9\u30e1\u30a4\u30f3\u304cfrom\u30c9\u30e1\u30a4\u30f3\u3068\u540c\u4e00\u3067\u3042\u308b\u304b\uff08strict\uff09\u3001\u5c11\u306a\u304f\u3068\u3082\u540c\u3058\u7d44\u7e54\u30c9\u30e1\u30a4\u30f3\u306b\u5c5e\u3057\u3066\u3044\u308b\uff08relaxed\uff09\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u308b\u3002\u8ee2\u9001\u306b\u306fSRS\uff08Sender Rewriting Scheme\uff09\u3092\u4f7f\u7528\u3057\u3001\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u304c\u9069\u5fdc\u3055\u308c\u3001\u4e0b\u6d41\u306e\u53d7\u4fe1\u8005\u306b\u5bfe\u3057\u3066SPF\u304c\u518d\u3073\u6709\u52b9\u306b\u306a\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002SRS\u3092\u5236\u5fa1\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u3001ID\u3092\u6e21\u3059\u5f37\u529b\u306aDKIM\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306b\u983c\u3063\u3066\u3044\u308b\u3002.<\/p>\n\n<h2>ARC: \u8907\u96d1\u306a\u914d\u9001\u7d4c\u8def\u306b\u5bfe\u3059\u308b\u4fe1\u983c\u306e\u9023\u9396<\/h2>\n<p>\u79c1\u306f\u6b21\u306e\u3053\u3068\u3092\u8003\u616e\u306b\u5165\u308c\u3066\u3044\u308b\u3002 <strong>\u30a2\u30fc\u30af<\/strong> (Authenticated Received Chain\uff09\u306f\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3001\u8ee2\u9001\u30b5\u30fc\u30d3\u30b9\u306a\u3069\u3092\u901a\u904e\u3057\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u307b\u3068\u3093\u3069\u5909\u66f4\u3055\u308c\u306a\u3044\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002ARC\u306f\u3001\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u8a8d\u8a3c\u7d50\u679c\u3092\u7f72\u540d\u3055\u308c\u305f\u30c1\u30a7\u30fc\u30f3\u306b\u4fdd\u5b58\u3059\u308b\u3002\u3053\u306e\u305f\u3081\u3001\u5927\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306f\u3001\u305f\u3068\u3048\u305d\u306e\u5f8c\u306e\u5909\u66f4\u304cDMARC\u3092\u7834\u308b\u3053\u3068\u306b\u306a\u3063\u305f\u3068\u3057\u3066\u3082\u3001\u30e1\u30fc\u30eb\u304c\u9001\u4fe1\u5143\u3067\u6b63\u3057\u304f\u8a8d\u8a3c\u3055\u308c\u305f\u3053\u3068\u3092\u8a8d\u8b58\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3057\u304b\u3057\u3001\u79c1\u306fARC\u3092\u76f2\u76ee\u7684\u306b\u53d7\u3051\u5165\u308c\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8ffd\u52a0\u306e\u30b7\u30b0\u30ca\u30eb\u3068\u3057\u3066\u542b\u3081\u308b\uff1aARC\u306b\u3082\u304b\u304b\u308f\u3089\u305aDKIM\/DMARC\u304c\u901a\u3089\u306a\u3044\u5834\u5408\u3001\u79c1\u306f\u4ecb\u5728\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u304c\u4fe1\u983c\u3067\u304d\u308b\u304b\u3001\u9593\u9055\u3063\u3066\u66f8\u304d\u63db\u3048\u3089\u308c\u3066\u3044\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002.<\/p>\n\n<h2>DMARC\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u30bf\u30fc\u30b2\u30c3\u30c8\u4f7f\u7528<\/h2>\n<p>v=DMARC1\u3068p=...\u3067DMARC\u3092\u8a2d\u5b9a\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u7d30\u304b\u3044\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3082\u4e00\u8cab\u3057\u3066\u4f7f\u3063\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li><strong>\u30eb\u30a2\/\u30b3\u30fc\u30eb<\/strong>\u30d5\u30a9\u30ec\u30f3\u30b8\u30c3\u30af\u30fb\u30ec\u30dd\u30fc\u30c8\uff08ruf\uff09\u306b\u306f\u500b\u4eba\u7684\u306a\u5185\u5bb9\u304c\u542b\u307e\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u6ce8\u610f\u3057\u3066\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002\u30ec\u30dd\u30fc\u30c8\u304c\u914d\u4fe1\u3055\u308c\u308b\u3088\u3046\u306b\u3001\u5e38\u306bDNS\u7d4c\u7531\u3067\u30ec\u30dd\u30fc\u30c8\u306e\u5916\u90e8\u53d7\u4fe1\u8005\u3092\u627f\u8a8d\u3057\u3066\u3044\u308b\u3002.<\/li>\n  <li><strong>\u30d1\u30fc\u30bb\u30f3\u30c8<\/strong>\u30ea\u30b9\u30af\u306e\u306a\u3044\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u6700\u521d\u3001\u30dd\u30ea\u30b7\u30fc\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u306e\u306f\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u3060\u3051\u3067\u3001100%\u306b\u9054\u3059\u308b\u307e\u3067\u6bb5\u968e\u7684\u306b\u5897\u3084\u3057\u3066\u3044\u304f\u3002.<\/li>\n  <li><strong>sp<\/strong>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u5225\u306e\u30dd\u30ea\u30b7\u30fc\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30e1\u30a4\u30f3\u30c9\u30e1\u30a4\u30f3\u306f\u3059\u3067\u306bp=reject\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u30c6\u30b9\u30c8\u30c9\u30e1\u30a4\u30f3\u3084\u30c4\u30fc\u30eb\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306f\u4f9d\u7136\u3068\u3057\u3066p=none\u3092\u5831\u544a\u3057\u307e\u3059\u3002.<\/li>\n  <li><strong>\u30a2\u30c9\u30ad\u30e0\/\u30a2\u30b9\u30d7\u30d5<\/strong>\u79c1\u306f\u3057\u3070\u3057\u3070\u30ea\u30e9\u30c3\u30af\u30b9\uff08r\uff09\u304b\u3089\u59cb\u3081\u3001\u9001\u308a\u624b\u306e\u30eb\u30fc\u30c8\u304c\u660e\u78ba\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u5b89\u5b9a\u5f8c\u306b\u30b9\u30c8\u30ea\u30af\u30c8\uff08s\uff09\u306b\u5207\u308a\u66ff\u3048\u308b\u3002.<\/li>\n  <li><strong>\u91cc<\/strong>\u79c1\u306f\u3001\u30c7\u30fc\u30bf\u3092\u8fc5\u901f\u306b\u53d7\u3051\u53d6\u308b\u305f\u3081\u3001\u3057\u304b\u3057\u6c3e\u6feb\u3055\u305b\u306a\u3044\u305f\u3081\u306b\u3001\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8\u306b\u306f\u9069\u5207\u306a\u9593\u9694\u3092\u9078\u3093\u3067\u3044\u308b\u3002.<\/li>\n<\/ul>\n\n<h2>DKIM\u30ad\u30fc\u7ba1\u7406\u3068\u30bb\u30ec\u30af\u30bf\u6226\u7565<\/h2>\n<p>\u3092\u8a08\u753b\u3057\u3066\u3044\u308b\u3002 <strong>\u30ad\u30fc\u56de\u8ee2<\/strong> 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3001dmarc=pass\/fail\u304c\u3001\u9069\u7528\u3055\u308c\u305f\u30dd\u30ea\u30b7\u30fc\u3068\u3068\u3082\u306b\u8868\u793a\u3055\u308c\u308b\u3002\u30dc\u30c7\u30a3\u30fb\u30cf\u30c3\u30b7\u30e5\u306e\u4e0d\u4e00\u81f4\u304c\u539f\u56e0\u3067dkim=fail\u306b\u906d\u9047\u3057\u305f\u5834\u5408\u3001\u79c1\u306f\u30d5\u30c3\u30bf\u30fc\u3092\u633f\u5165\u3057\u305f\u308a\u3001\u884c\u3092\u6298\u308a\u8fd4\u3057\u305f\u308a\u3059\u308b\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3092\u691c\u7d22\u3059\u308b\u3002spf=fail\u306e\u5834\u5408\u3001SPF\u30d5\u30e9\u30c3\u30c8\u5316\u3092\u542b\u3080\u30ea\u30bf\u30fc\u30f3\u30d1\u30b9\u3068IP\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002dkim=pass\u306b\u3082\u304b\u304b\u308f\u3089\u305admarc=fail\u306e\u5834\u5408\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u5d29\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\uff08d=-domain\u304cfrom-domain\u3068\u4e00\u81f4\u3057\u306a\u3044\uff09\u306e\u3067\u3001d=\u304bfrom-identity\u3092\u4fee\u6b63\u3059\u308b\u3002.<\/p>\n\n<h2>BIMI\uff1aDMARC\u306b\u57fa\u3065\u304f\u76ee\u306b\u898b\u3048\u308b\u30d6\u30e9\u30f3\u30c9\u5f37\u5316<\/h2>\n<p>\u79c1\u306f\u3053\u3046\u3057\u3066\u3044\u308b\u3002 <strong>BIMI<\/strong>, \u30b5\u30dd\u30fc\u30c8\u3059\u308b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u30d6\u30e9\u30f3\u30c9\u30ed\u30b4\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u7406\u306b\u304b\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u3002\u524d\u63d0\u6761\u4ef6\u3068\u3057\u3066\u3001DMARC\u30dd\u30ea\u30b7\u30fc\uff08\u9694\u96e2\uff0f\u62d2\u5426\uff09\u3068\u30af\u30ea\u30fc\u30f3\u306a\u9001\u4fe1\u8005\u30b9\u30da\u30fc\u30b9\u304c\u65bd\u884c\u3055\u308c\u3066\u3044\u308b\u3002\u79c1\u306f\u6b63\u3057\u3044SVG\u30ed\u30b4\u3068\u3001\u53d7\u4fe1\u8005\u306b\u3088\u3063\u3066\u306f\u691c\u8a3c\u6e08\u307f\u306e\u30d6\u30e9\u30f3\u30c9\u8a3c\u660e\u66f8\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002BIMI\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u4ee3\u7528\u54c1\u3067\u306f\u306a\u304f\u3001\u4e00\u8cab\u3057\u305f\u8a8d\u8a3c\u3068\u53d7\u4fe1\u8005\u306e\u76ee\u306b\u898b\u3048\u308b\u78ba\u8a8d\u306b\u5bfe\u3059\u308b\u5831\u916c\u3067\u3042\u308b\u3002.<\/p>\n\n<h2>DNA\u3068\u8f38\u9001\u885b\u751f\u306e\u57fa\u790e<\/h2>\n<p>\u79c1\u306f\u30a4\u30f3\u30d5\u30e9\u3092\u30af\u30ea\u30fc\u30f3\u306b\u3057\u3066\u3044\u307e\u3059\uff1a\u4e00\u81f4\u3059\u308bPTR\uff08\u30ea\u30d0\u30fc\u30b9DNS\uff09\u304cEHLO\/HELO\u540d\u3092\u6307\u3057\u3001\u305d\u308c\u304c\u6709\u52b9\u306aA\/AAA\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3059\u306e\u3067\u3059\u3002SPF\u3001DKIM\u3001DMARC\u306f\u3053\u306e\u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u3068\u4e00\u81f4\u3059\u308b\u3002\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306b\u306f\u3001\u6700\u65b0\u306e\u6697\u53f7\u3092\u4f7f\u3063\u305fTLS\u306b\u4f9d\u5b58\u3057\u3001\u30aa\u30d7\u30b7\u30e7\u30f3\u3067MTA-STS\/TLS-RPT\u3068\u3001\u5229\u7528\u53ef\u80fd\u3067\u3042\u308c\u3070DNSSEC\u3092\u4f7f\u3063\u305fDANE\u3092\u8ffd\u52a0\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u653b\u6483\u5bfe\u8c61\u304c\u6e1b\u308a\u3001\u914d\u4fe1\u30b7\u30b0\u30ca\u30eb\u3082\u6539\u5584\u3055\u308c\u308b\u3002.<\/p>\n\n<h2>\u5927\u578b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u95a2\u3059\u308b\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u8981\u4ef6<\/h2>\n<p>\u79c1\u306f\u5927\u898f\u6a21\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u8981\u4ef6\u3092\u9075\u5b88\u3057\u3066\u3044\u307e\u3059\uff1a\u660e\u78ba\u306a\u9001\u4fe1\u8005\u3001\u6709\u52b9\u306aDKIM\u7f72\u540d\u3001DMARC\u30dd\u30ea\u30b7\u30fc\u3001\u82e6\u60c5\u7387\u306e\u4f4e\u3055\u3001\u30d0\u30eb\u30af\u9001\u4fe1\u8005\u306e\u30ea\u30b9\u30c8\u914d\u4fe1\u505c\u6b62\u3001\u4e00\u8cab\u3057\u305frDNS\/HELO\u3068TLS\u3002\u3053\u308c\u3089\u306e\u57fa\u672c\u30eb\u30fc\u30eb\u3092\u6e80\u305f\u305b\u3070\u3001\u4e00\u62ec\u30d6\u30ed\u30c3\u30af\u3084\u4e0d\u5fc5\u8981\u306a\u30b9\u30d1\u30e0\u5206\u985e\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002DMARC\u306e\u65bd\u884c\u306f\u3001\u53d7\u4fe1\u8005\u3092\u4fdd\u8b77\u3059\u308b\u305f\u3081\u3060\u3051\u3067\u306a\u304f\u3001\u8a55\u5224\u306e\u826f\u3044\u9001\u4fe1\u8005\u306e\u305f\u3081\u306e\u54c1\u8cea\u6a5f\u80fd\u3068\u3057\u3066\u3082\u3001\u3053\u3053\u3067\u306e\u6838\u3068\u306a\u308b\u8981\u7d20\u3067\u3059\u3002.<\/p>\n\n<h2>\u30c6\u30b9\u30c8\u3068\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u6226\u7565<\/h2>\n<p>\u79c1\u306f\u5927\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3067\u30b7\u30fc\u30c9\u30ea\u30b9\u30c8\u3092\u4f7f\u7528\u3057\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u306e\u914d\u7f6e\u958b\u767a\u3092\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306f\u307e\u305a\u3001\u30ad\u30fc\u3001\u30dd\u30ea\u30b7\u30fc\u3001\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1\u30d1\u30b9\u306e\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u5c11\u91cf\u305a\u3064(pct)\u3001p=none\u3001\u6b21\u306bp=quarantine\u3001\u6700\u5f8c\u306bp=reject\u3067\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002\u540c\u6642\u306b\u3001\u30d0\u30a6\u30f3\u30b9\u30b3\u30fc\u30c9\u3092\u76e3\u8996\u3057\u3001\u914d\u4fe1\u306e\u554f\u984c\u304c\u8a8d\u8a3c\u3068\u95a2\u9023\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u3053\u306e\u898f\u5f8b\u306f\u3001\u30cf\u30fc\u30c9\u30d6\u30ec\u30a4\u30af\u3092\u9632\u304e\u3001\u5b89\u5b9a\u3057\u305f\u751f\u7523\u307e\u3067\u306e\u6642\u9593\u3092\u77ed\u7e2e\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u56fd\u969b\u5316\u30c9\u30e1\u30a4\u30f3\u3068\u7279\u6b8a\u6587\u5b57<\/h2>\n<p>IDN\u3092\u8003\u616e\u3059\u308b\uff1aFrom\u30c9\u30e1\u30a4\u30f3\u3068DKIM-d=\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u30ed\u30d0\u30b9\u30c8\u306b\u4fdd\u305f\u308c\u308b\u3088\u3046\u306b\u3001\u5185\u90e8\u3067Punycode\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u7570\u306a\u308b\u30b9\u30da\u30eb\u3068Unicode\u306e\u6b63\u898f\u5316\u306f\u3001\u5fae\u5999\u306a\u8aa4\u8b66\u5831\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u306f\u30ed\u30b0\u3068\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3067\u30cd\u30a4\u30c6\u30a3\u30d6\u8868\u73fe\u3068ASCII\u5f62\u5f0f\u306e\u4e21\u65b9\u3092\u5206\u6790\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u5b9f\u52d9\u306b\u304a\u3051\u308b\u5178\u578b\u7684\u306a\u30a8\u30e9\u30fc\u306e\u539f\u56e0<\/h2>\n<ul>\n 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