{"id":2074,"date":"2026-03-25T22:30:22","date_gmt":"2026-03-25T13:30:22","guid":{"rendered":"https:\/\/euc-access-excel-db.com\/tips\/?p=2074"},"modified":"2026-04-03T23:57:25","modified_gmt":"2026-04-03T14:57:25","slug":"mail-header-chk01","status":"publish","type":"post","link":"https:\/\/euc-access-excel-db.com\/tips\/ct07_se\/ct071101_security\/mail-header-chk01","title":{"rendered":"\u25cf\u30d1\u30bd\u30b3\u30f3\u521d\u5fc3\u8005\u5411\u3051\u30fb\u8a50\u6b3a\u30e1\u30fc\u30eb\u3084\u602a\u3057\u3044\u30e1\u30fc\u30eb\u306e\u300c\u8d85\u7c21\u6613\u30d8\u30c3\u30c0\u5224\u5b9a\u65b9\u6cd5\u300d"},"content":{"rendered":"<p>\u25cf\u30d1\u30bd\u30b3\u30f3\u521d\u5fc3\u8005\u5411\u3051\u30fb\u8a50\u6b3a\u30e1\u30fc\u30eb\u3084\u602a\u3057\u3044\u30e1\u30fc\u30eb\u306e\u300c\u8d85\u7c21\u6613\u30d8\u30c3\u30c0\u5224\u5b9a\u65b9\u6cd5\u300d<\/p>\n<p>\u307e\u305a\u524d\u63d0\uff1a<\/p>\n<p>\u602a\u3057\u3044\u30e1\u30fc\u30eb\u306f\u7d76\u5bfe\u306b\u958b\u304b\u306a\u3044\u3002\u5373\u524a\u9664\u3002<br 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\/>\n\u307e\u305f\u3001\u300c\u3042\u304d\u3089\u304b\u306b\u65e5\u672c\u306e\u611f\u3058\u3058\u3083\u306a\u3044\u3001\u81ea\u5206\u304c\u77e5\u3089\u306a\u3044\u5909\u306a\u30a2\u30c9\u30ec\u30b9\u3001\u65e5\u672c\u306e\u4f1a\u793e\u540d\u304c\u542b\u307e\u308c\u306a\u3044\u300d\u306a\u3069\u3082\u3001\u304b\u306a\u308a\u602a\u3057\u3044\u3002<\/p>\n<p><font style=\"border-bottom:3px double #0000ff;\"><span style=\"color: #ff0000;\"><b>\u3068\u3044\u3044\u307e\u3059\u304b\u3001\u6b63\u898f\u306e\u30e1\u30fc\u30eb\u3060\u3068\u3001\u300cReturn-Path:\u300d\u3084\u300cMessage-ID:\u300d\u306b\u3001\u300c\u5dee\u51fa\u4eba\u300d\u306e\u4f1a\u793e\u540d\u306e\u82f1\u8a9e\u540d\u3084\u300cbounce\u300d\u3084\u300cbounces\u300d\u3068\u3044\u3046\u5358\u8a9e\u304c\u542b\u307e\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<br \/>\n\u306a\u306e\u3067\u3001\u300c\u904e\u53bb\u306e\u6b63\u5e38\u30e1\u30fc\u30eb\u3068\u6bd4\u8f03\u300d\u300c\u3057\u306a\u304f\u3066\u3082\u300d\u3001\u305d\u308c\u304c\u7121\u3044\u30e1\u30fc\u30eb\u306f\u5927\u62b5\u3001\u8a50\u6b3a\u30e1\u30fc\u30eb\u3067\u3059\u3002<br \/>\n\u305d\u308c\u3067\uff19\u5272\u306f\u5224\u65ad\u3067\u304d\u307e\u3059\u3002<\/b><\/span><\/font><\/p>\n<p><font style=\"border-bottom:3px double #ff0000;\"><span style=\"color: #0000ff;\"><b>\u2192 \u3064\u307e\u308a\u3001\u57fa\u672c\u3001\u305d\u3053\u3092\u898b\u305f\u3060\u3051\u3067\u3082\u958b\u304b\u306a\u3044\u307b\u3046\u304c\u3044\u3044\u3002\u306e\u3067\u3001\u5373\u523b\u3001\u6368\u3066\u308b\u3002<\/b><\/span><\/font><\/p>\n<p>\u3082\u3061\u308d\u3093\u3001\u672c\u6587URL\u306e\u30af\u30ea\u30c3\u30af\u3084\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306e\u30aa\u30fc\u30d7\u30f3\u3082\u53b3\u7981\u3002<\/p>\n<p>\u203b\u6ce8\u610f\uff01\uff01\uff01<br \/>\n\u30b9\u30de\u30db\u3060\u3068\u30d8\u30c3\u30c0\u306e\u60c5\u5831\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3065\u3089\u3044\u304b\u3082\uff1f\u3067\u3059\u3002<br \/>\n\u30d1\u30bd\u30b3\u30f3\u306a\u3089\u78ba\u5b9f\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4e8b\u4f8b\uff1a\u4ee5\u4e0b\u3001\u305d\u3046\u3044\u3046\u602a\u3057\u3044\u5909\u306a\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u4e8b\u4f8b<\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><\/p>\n<p>\uff1d\uff1d\uff1d\uff1d\uff1d\uff1d\uff1d<br \/>\n\u3055\u3089\u306b\u3061\u3083\u3093\u3068\u8abf\u3079\u305f\u3044\u5834\u5408\u3002<br \/>\n\uff1d\uff1d\uff1d\uff1d\uff1d\uff1d\uff1d<\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><\/p>\n<p>\u25a0 \u2460<\/p>\n<p>\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u3092\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306b\u30b3\u30d4\u30da\u3057\u3066\u3001<br \/>\n\u300cAuthentication-Results:\u300d \u3092\u63a2\u3059\u3002<br \/>\n\uff08Ctrl\uff0bF\u306e\u691c\u7d22\u64cd\u4f5c\u3067\u63a2\u3059\u3068\u4fbf\u5229\u3067\u3059\u3002\u3053\u308c\u4ee5\u964d\u306e\u30c1\u30a7\u30c3\u30af\u30ef\u30fc\u30c9\u3082\u540c\u69d8\u3002\uff09<\/p>\n<p>\u203b\u300cARC-Authentication-Results:\u300d\u306f\u53c2\u8003\u7a0b\u5ea6\u3002<br \/>\n\u3000\u300cAuthentication-Results:\u300d\u3068\u3060\u3051\u66f8\u304b\u308c\u3066\u3044\u308b\u307b\u3046\u3092\u4f7f\u3046\u30fb\u898b\u308b\u3002<\/p>\n<p>\u203b\u7121\u3044\u5834\u5408\u306f\u2462\u2463\u3092\u53c2\u8003\u306b\u3059\u308b<\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><\/p>\n<p>\u25a0 \u2461<\/p>\n<p>\u6b21\u3092\u898b\u308b\uff1a<\/p>\n<p>Authentication-Results \u306b<br \/>\n\u300cdmarc=fail\u300d\u304c\u3042\u308b \u2192 \u5373\u7121\u8996\u304b\u524a\u9664\u3002\uff08\u307b\u307c\u8a50\u6b3a\uff09<\/p>\n<p>\u203b\u300cdmarc=pass\u300d\u3084\u300cdmarc=xxxx\u300d\u81ea\u4f53\u304c\u5b58\u5728\u3057\u306a\u3044\u306a\u3089\u5c11\u3057OK\u3002<br \/>\n\u3000\u3000\u3067\u3082\u5b8c\u5168\u306b\u5b89\u5168\u3068\u306f\u9650\u3089\u306a\u3044\u305f\u3081\u6cb9\u65ad\u3057\u306a\u3044\u3002<\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><\/p>\n<p>\u25a0 \u2462<\/p>\n<p>dmarc\u304c\u7121\u304f\u3066\u3082\uff1a<\/p>\n<p>spf=softfail \u307e\u305f\u306f fail<br \/>\n\u304b\u3064<br \/>\ndkim=none<\/p>\n<p>\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306a\u3089\u304b\u306a\u308a\u602a\u3057\u3044\uff08\u8981\u6ce8\u610f\uff09<\/p>\n<p>\u203bdkim=none \u5358\u72ec\u3067\u306f\u5224\u5b9a\u3067\u304d\u306a\u3044\u304c\u3001\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306a\u3089\u5371\u967a\u5ea6\u304c\u9ad8\u3044<\/p>\n<p>\u203b\u78ba\u5b9a\u3067\u306f\u306a\u3044\u304c\u3001\u57fa\u672c\u306f<br \/>\n\u7121\u8996\u304b\u524a\u9664\u3002\u30fb\u958b\u304b\u306a\u3044\u30fb\u672c\u6587URL\u7d76\u5bfe\u7121\u8996\u30fb\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30ebOpen\u53b3\u7981\u3001\u3067OK\u3002<\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><\/p>\n<p>\u25a0 \u2463 \u3055\u3089\u306b\u78ba\u8a8d\uff08\u4f59\u88d5\u304c\u3042\u308c\u3070\uff09<br \/>\nsmtp.mailfrom \u306e\uff1d\u306e\u53f3\u8fba\uff08\u30c9\u30e1\u30a4\u30f3\uff09\u306e\u56fd\u7c4d<br \/>\nsmtp.remote-ip \u306e\uff1d\u306e\u53f3\u8fba\uff08IP\u30a2\u30c9\u30ec\u30b9\uff09\u306e\u56fd\u7c4d<\/p>\n<p>\u3053\u306e2\u3064\u3092\u8abf\u3079\u3066\uff1a<br \/>\n\u304a\u4e92\u3044\u306e\u56fd\u7c4d\u304c\u7570\u306a\u308b\u5834\u5408\uff08\u3068\u3044\u3046\u304b\u660e\u3089\u304b\u306b\u4e0d\u81ea\u7136\u306a\u5834\u5408\uff09\u306a\u3089\u7121\u8996\u304b\u524a\u9664\u3002<\/p>\n<p>\uff08\u4f8b\uff1a\u3044\u305a\u308c\u304b\u306e\u56fd\u7c4d\u304c\u65e5\u672c\u306a\u306e\u306b\u3001\u3082\u3046\u3044\u305a\u308c\u304b\u304c\u5357\u7c73\u306a\u3069\uff09<\/p>\n<p>\u203b\u305f\u3060\u3057 Google \u3084 Microsoft \u306a\u3069\u306e\u6709\u540d\u30b5\u30fc\u30d3\u30b9\u306f\u6d77\u5916\u30b5\u30fc\u30d0\uff08\u30a2\u30e1\u30ea\u30ab\u306a\u3069\uff09\u304c\u666e\u901a\u306a\u306e\u3067\u4f8b\u5916<\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><\/p>\n<p>\u25a0 IP\u30fb\u30c9\u30e1\u30a4\u30f3\u306e\u56fd\u7c4d\u306e\u8abf\u3079\u65b9<\/p>\n<p>IP\u30a2\u30c9\u30ec\u30b9\u306e\u56fd\u7c4d\u8abf\u67fb<br \/>\n<a href=\"https:\/\/www.geolocation.com\/ja?\" target=\"_blank\" rel=\"noopener\">https:\/\/www.geolocation.com\/ja?<\/a><\/p>\n<p>\u30c9\u30e1\u30a4\u30f3\u540d\u306e\u56fd\u7c4d\u8abf\u67fb\uff08IP\u30a2\u30c9\u30ec\u30b9\u3082OK\u3002\uff09<br \/>\n<a href=\"https:\/\/www.cman.jp\/network\/support\/ip.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.cman.jp\/network\/support\/ip.html<\/a><\/p>\n<p><SPAN>\u3000\u3000<\/SPAN><br \/>\n<SPAN>\u3000\u3000<\/SPAN><br \/>\n<SPAN>\u3000\u3000<\/SPAN><br \/>\n<SPAN>\u3000\u3000<\/SPAN><\/p>\n","protected":false},"excerpt":{"rendered":"\u25cf\u30d1\u30bd\u30b3\u30f3\u521d\u5fc3\u8005\u5411\u3051\u30fb\u8a50\u6b3a\u30e1\u30fc\u30eb\u3084\u602a\u3057\u3044\u30e1\u30fc\u30eb\u306e\u300c\u8d85\u7c21\u6613\u30d8\u30c3\u30c0\u5224\u5b9a\u65b9\u6cd5\u300d \u307e\u305a\u524d\u63d0\uff1a \u602a\u3057\u3044\u30e1\u30fc\u30eb\u306f\u7d76\u5bfe\u306b\u958b\u304b\u306a\u3044\u3002\u5373\u524a\u9664\u3002 \u672c\u6587\u306eURL\u306f\u7d76\u5bfe\u306b\u30af\u30ea\u30c3\u30af\u3057\u306a\u3044\u3002 \u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306f\u7d76\u5bfe\u306b\u958b\u304b\u306a\u3044\u3002 \u305d\u3057\u3066\u3001\u300c\u8ff7\u3063\u305f\u6642\u3082\u3059\u3079 ...","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[30],"_links":{"self":[{"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/posts\/2074"}],"collection":[{"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/comments?post=2074"}],"version-history":[{"count":0,"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/posts\/2074\/revisions"}],"wp:attachment":[{"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/media?parent=2074"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euc-access-excel-db.com\/tips\/wp-json\/wp\/v2\/categories?post=2074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}