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<strong>\u8ff7\u60d1\u30e1\u30fc\u30eb\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u308b<\/strong>\u3053\u308c\u306f\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u8a8d\u8a3c\u306e\u5f31\u3055\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u8a55\u5224\u306e\u60aa\u3055\u3001\u4ef6\u540d\u3084\u672c\u6587\u306e\u5185\u5bb9\u306b\u95a2\u9023\u3057\u305f\u30c8\u30ea\u30ac\u30fc\u304c\u539f\u56e0\u3067\u3059\u3002\u6700\u3082\u4e00\u822c\u7684\u306a\u539f\u56e0\u3092\u7d39\u4ecb\u3057\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0\u3067\u306f\u306a\u304f\u3001\u78ba\u5b9f\u306b\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u5177\u4f53\u7684\u306a\u624b\u9806\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>\u8a8d\u8a3c<\/strong> SPF\u3001DKIM\u3001DMARC\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b\u3002<\/li>\n  <li><strong>\u8a55\u5224<\/strong> \u30c9\u30e1\u30a4\u30f3\u3068IP\u3092\u7a4d\u6975\u7684\u306b\u4fdd\u8b77<\/li>\n  <li><strong>\u5185\u5bb9<\/strong> \u660e\u78ba\u306b\u3001\u9593\u9055\u3048\u306a\u304f\u3001\u30b9\u30d1\u30e0\u7528\u8a9e\u3092\u4f7f\u308f\u305a\u306b\u66f8\u304f<\/li>\n  <li><strong>\u30ea\u30b9\u30c8\u885b\u751f<\/strong> \u30c0\u30d6\u30eb\u30aa\u30d7\u30c8\u30a4\u30f3\u3068\u914d\u4fe1\u505c\u6b62\u30ea\u30f3\u30af\u4ed8\u304d<\/li>\n  <li><strong>\u8a3a\u65ad<\/strong> \u30d8\u30c3\u30c0\u30fc\u89e3\u6790\u3068\u30b9\u30d1\u30e0\u691c\u67fb<\/li>\n<\/ul>\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\/2025\/10\/emails-im-spam-ordner-6023.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u306a\u305c\u6b63\u5f53\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30b9\u30d1\u30e0\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u304b\uff1f<\/h2>\n\n<p>\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u306f\u3001\u5404\u30e1\u30fc\u30eb\u3092\u591a\u304f\u306e\u9805\u76ee\u306b\u57fa\u3065\u3044\u3066\u8a55\u4fa1\u3057\u307e\u3059\u3002 <strong>\u4fe1\u53f7<\/strong>.\u3053\u308c\u306b\u306f\u3001\u8a8d\u8a3c\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u5c65\u6b74\u3001\u30c6\u30ad\u30b9\u30c8\u3068\u753b\u50cf\u306e\u6bd4\u7387\u3001\u4ef6\u540d\u3001\u53d7\u4fe1\u8005\u306e\u53cd\u5fdc\u306a\u3069\u304c\u542b\u307e\u308c\u307e\u3059\u3002\u3042\u306a\u305f\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u82e6\u60c5\u3084\u914d\u9001\u30a8\u30e9\u30fc\u304c\u591a\u3044\u5834\u5408\u306f <strong>\u8a55\u5224<\/strong> 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height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30c9\u30e1\u30a4\u30f3\u3068IP\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u7a4d\u6975\u7684\u306b\u4fdd\u8b77<\/h2>\n\n<p>\u826f\u3044\u30c7\u30ea\u30d0\u30ea\u30fc\u306f\u30af\u30ea\u30fc\u30f3\u304b\u3089\u59cb\u307e\u308b <strong>\u8a55\u5224<\/strong>.\u79c1\u306f\u4fe1\u983c\u3067\u304d\u308b\u30b5\u30fc\u30d0\u30fc\u7d4c\u7531\u3067\u306e\u307f\u9001\u4fe1\u3057\u3001\u5b9a\u671f\u7684\u306b\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u9001\u4fe1\u30ec\u30fc\u30c8\u3092\u5b89\u5b9a\u3055\u305b\u3001\u4e88\u6e2c\u53ef\u80fd\u306a\u72b6\u614b\u306b\u4fdd\u3063\u3066\u3044\u307e\u3059\u3002\u51b7\u305f\u3044\u5927\u91cf\u30e1\u30fc\u30eb\u3001\u4e0d\u898f\u5247\u306a\u30d4\u30fc\u30af\u3001\u307e\u305f\u306f\u7a4d\u6975\u7684\u306a\u30ea\u30bf\u30fc\u30b2\u30c6\u30a3\u30f3\u30b0\u306f\u3001\u3059\u3050\u306b\u4fe1\u983c\u6027\u3092\u4f4e\u4e0b\u3055\u305b\u307e\u3059\u3002\u4e00\u8cab\u3057\u305f\u30d0\u30a6\u30f3\u30b9\u51e6\u7406\u3068\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30b3\u30f3\u30bf\u30af\u30c8\u306e\u524a\u9664\u306f\u3001\u30ea\u30b9\u30c8\u3092\u5065\u5168\u306b\u4fdd\u3061\u307e\u3059\u3002\u3088\u308a\u6df1\u304f\u5b9f\u8df5\u3057\u305f\u3044\u306e\u3067\u3042\u308c\u3070\u3001\u79c1\u306e\u4ee5\u4e0b\u306e\u30ac\u30a4\u30c9\u304c\u5f79\u306b\u7acb\u3064\u3060\u308d\u3046\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%a1%e3%83%bc%e3%83%ab%e5%8f%97%e4%bf%a1%e6%9c%80%e9%81%a9%e5%8c%96%e3%82%ac%e3%82%a4%e3%83%89\/\">\u53d7\u4fe1\u30c8\u30ec\u30a4\u306e\u6700\u9069\u5316<\/a> \u6709\u7528\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306e\u30d2\u30f3\u30c8\u3068\u3068\u3082\u306b\u3002<\/p>\n\n<h2>\u5185\u5bb9\u3001\u4ef6\u540d\u3001\u9001\u4fe1\u8005\uff1a\u30d5\u30a3\u30eb\u30bf\u306e\u30c8\u30ea\u30ac\u30fc\u3068\u306a\u308b\u3082\u306e<\/h2>\n\n<p>\u79c1\u306f\u3001\u30af\u30ea\u30c3\u30af\u30d9\u30a4\u30c8\u306e\u306a\u3044\u4ef6\u540d\u3092\u66f8\u304d\u3001\u3059\u3079\u3066\u306e\u5358\u8a9e\u304c\u6f5c\u5728\u7684\u306a\u53ef\u80fd\u6027\u3092\u6301\u3063\u3066\u3044\u306a\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002 <strong>\u30c8\u30ea\u30ac\u30fc<\/strong>.\u611f\u5606\u7b26\u3092\u591a\u7528\u3057\u305f\u308a\u3001\u5927\u6587\u5b57\u3092\u591a\u7528\u3057\u305f\u308a\u3001\u3044\u304b\u304c\u308f\u3057\u3044\u7d04\u675f\u4e8b\u3084\u7d75\u3070\u304b\u308a\u306e\u5185\u5bb9\u306f\u3001\u30ea\u30b9\u30af\u3092\u8457\u3057\u304f\u9ad8\u3081\u307e\u3059\u3002\u305d\u306e\u4ee3\u308f\u308a\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u660e\u78ba\u3067\u4e8b\u5b9f\u306b\u57fa\u3065\u304d\u3001\u53d7\u4fe1\u8005\u306b\u95a2\u9023\u3057\u305f\u3082\u306e\u306b\u3057\u307e\u3059\u3002\u9001\u4fe1\u8005\u306e\u540d\u524d\u3001\u660e\u78ba\u306a\u9001\u4fe1\u8005\u306e\u4f4f\u6240\u3001\u5b8c\u5168\u306a\u7f72\u540d\u306f\u4fe1\u983c\u3092\u751f\u307f\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u306b\u30dd\u30b8\u30c6\u30a3\u30d6\u306a\u30e6\u30fc\u30b6\u30fc\u30b7\u30b0\u30ca\u30eb\u304c\u84c4\u7a4d\u3055\u308c\u3001\u305d\u306e\u7d50\u679c\u3001\u6b21\u306e\u3088\u3046\u306a\u52b9\u679c\u304c\u671f\u5f85\u3067\u304d\u308b\u3002 <strong>\u914d\u9001<\/strong> \u8cdb\u6210\u3060\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\/2025\/10\/emails-spam-vermeiden-tipps-4937.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30c1\u30a7\u30c3\u30af\uff1a\u30c6\u30ad\u30b9\u30c8\u3068\u753b\u50cf\u306e\u6bd4\u7387\u3068\u30ec\u30a4\u30a2\u30a6\u30c8<\/h2>\n\n<p>\u591a\u304f\u306e\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u30fc\u306f <strong>\u30ec\u30a4\u30a2\u30a6\u30c8<\/strong>.\u30c6\u30ad\u30b9\u30c8\u3068\u753b\u50cf\u306e\u6bd4\u7387\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u304c\u5185\u5bb9\u3092\u4f1d\u3048\u3001\u753b\u50cf\u306f\u305d\u308c\u3092\u88dc\u8db3\u3059\u308b\u7a0b\u5ea6\u306b\u4fdd\u3064\u3002alt\u30c6\u30ad\u30b9\u30c8\u306e\u306a\u3044\u5927\u304d\u306a\u753b\u50cf\u30d0\u30ca\u30fc\u3001\u5916\u90e8\u30ea\u30f3\u30af\u306e\u6c3e\u6feb\u3001\u30cd\u30b9\u30c8\u3057\u305fHTML\u69cb\u9020\u306f\u602a\u3057\u304f\u898b\u3048\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u304f\u3001\u30bb\u30de\u30f3\u30c6\u30a3\u30c3\u30af\u306b\u30af\u30ea\u30fc\u30f3\u306a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306f\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u683c\u6bb5\u306b\u826f\u3044\u7d50\u679c\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u9001\u4fe1\u524d\u306b\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u30c6\u30b9\u30c8\u3068\u30b9\u30d1\u30e0\u30c6\u30b9\u30c8\u3067\u30e1\u30fc\u30eb\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u7f60\u3092\u65e9\u671f\u306b\u767a\u898b\u3057\u3066\u56de\u907f\u3057\u307e\u3059\u3002 <strong>\u6b63\u3057\u3044<\/strong>.<\/p>\n\n<h2>\u5927\u578b\u90f5\u4fbf\u30dd\u30b9\u30c8\u306e\u8981\u4ef6 2024\/2025<\/h2>\n\n<p>\u79c1\u306f\u3001\u30b0\u30fc\u30b0\u30eb\u3084\u30e4\u30d5\u30fc\u306a\u3069\u306e\u5927\u624b\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306b\u5f93\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306b\u306f <strong>\u8a8d\u8a3c\u6e08\u307f<\/strong> (SPF\u3068DKIM\u304c\u5b58\u5728\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff09\u3002 <strong>DMARC\u30dd\u30ea\u30b7\u30fc<\/strong> \u9001\u4fe1\u5074\u30c9\u30e1\u30a4\u30f3\u306b\u306f <strong>\u4f4e\u30af\u30ec\u30fc\u30e0\u7387<\/strong> (\u79c1\u306f0.1 %\u4ee5\u4e0b\u3092\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u3057\u3066\u3044\u308b)\u3002 <strong>\u30ea\u30b9\u30c8\u914d\u4fe1\u505c\u6b62<\/strong> \u3092\u30d8\u30c3\u30c0\u30fc\u306b\u8ffd\u52a0\u3057\u307e\u3059\uff08\u7406\u60f3\u7684\u306b\u306f\u30ef\u30f3\u30af\u30ea\u30c3\u30af\u306e\u30d0\u30ea\u30a2\u30f3\u30c8\uff09\u3002\u307e\u305f\u3001From\u30c9\u30e1\u30a4\u30f3\u304c\u672c\u5f53\u306b\u79c1\u306e\u3082\u306e\u3067\u3001\u8a8d\u8a3c\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u306b\u30ea\u30f3\u30af\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3082\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002 <em>\u6574\u5217<\/em> \u3067\u3059\u3002\u79c1\u306e\u30e1\u30fc\u30eb\u306fRFC\u306b\u6e96\u62e0\u3057\u3066\u304a\u308a\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306bTLS\u3092\u4f7f\u7528\u3057\u3001\u8aa4\u89e3\u3092\u62db\u304f\u3088\u3046\u306a\u30a8\u30f3\u30d9\u30ed\u30fc\u30d7\u306e\u5dee\u51fa\u4eba\u3092\u542b\u3093\u3067\u3044\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u306e\u57fa\u6e96\u3092\u304d\u3061\u3093\u3068\u6e80\u305f\u305b\u3070\u3001\u5927\u898f\u6a21\u306a\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3067\u306e\u9806\u4f4d\u304c\u683c\u6bb5\u306b\u5b89\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n<h2>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3068IP\u6226\u7565<\/h2>\n\n<p>\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\uff08\u8acb\u6c42\u66f8\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u30ea\u30bb\u30c3\u30c8\uff09\u3068\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u7528\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u3092\u610f\u56f3\u7684\u306b\u5206\u3051\u3066\u3044\u308b\u3002 <strong>\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3<\/strong> \u3053\u308c\u306b\u3088\u308a\u3001\u5404\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u660e\u78ba\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u30dc\u30ea\u30e5\u30fc\u30e0\u306b\u5fdc\u3058\u3066\u3001\u79c1\u306f <strong>\u5c02\u7528IP<\/strong> (\u30d5\u30eb\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3060\u304c\u3001\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7\u306f\u5fc5\u8981) \u307e\u305f\u306f <strong>\u5171\u6709IP<\/strong> \u8a55\u5224\u306e\u826f\u3044\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\uff08\u30b9\u30bf\u30fc\u30c8\u306f\u65e9\u3044\u304c\u3001\u8fd1\u96a3\u306b\u5de6\u53f3\u3055\u308c\u308b\uff09\u3002\u91cd\u8981\u306a\u306e\u306f\u4e00\u8cab\u6027 <strong>\u30ea\u30d0\u30fc\u30b9DNS<\/strong>-\u30a8\u30f3\u30c8\u30ea\u3001\u9069\u5207\u306aHELO\/EHLO\u30db\u30b9\u30c8\u540d\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u3001\u305d\u3057\u3066\u614e\u91cd\u306a <strong>\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7<\/strong>\u79c1\u306f\u3001\u5c0f\u898f\u6a21\u3067\u30a8\u30f3\u30b2\u30fc\u30b8\u30e1\u30f3\u30c8\u306e\u9ad8\u3044\u30bb\u30b0\u30e1\u30f3\u30c8\u304b\u3089\u59cb\u3081\u3001\u30d0\u30a6\u30f3\u30b9\u3001\u958b\u5c01\u3001\u30af\u30ea\u30c3\u30af\u3001\u82e6\u60c5\u3092\u6ce8\u610f\u6df1\u304f\u30e2\u30cb\u30bf\u30fc\u3057\u306a\u304c\u3089\u3001\u6bb5\u968e\u7684\u306b\u91cf\u3092\u5897\u3084\u3057\u3066\u3044\u304f\u3002<\/p>\n\n<h2>SPF\u3001DKIM\u3001DMARC\u3092\u8a73\u7d30\u306b\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b<\/h2>\n\n<p>\u6642\u70b9\u3067\u306f <strong>SPF<\/strong> DNS\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u306f\u6700\u592710\u56de\u307e\u3067\u3068\u3044\u3046\u5236\u9650\u3092\u5b88\u308a\u3001\u30cd\u30b9\u30c8\u3057\u305f \"include \"\u30c1\u30a7\u30fc\u30f3\u306f\u907f\u3051\u308b\u3002\u79fb\u52d5\u3059\u308b\u3068\u304d\u306f\u3001\u4e00\u6642\u7684\u306b\u300c~all\u300d\u3092\u8a2d\u5b9a\u3057\u3001\u5f8c\u3067\u5f37\u5316\u3059\u308b\u3002 <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>\u79c1\u306f2048\u30d3\u30c3\u30c8\u306e\u30ad\u30fc\u3092\u9078\u3073\u3001\u30bb\u30ec\u30af\u30bf\u30d9\u30fc\u30b9\u3067\u56de\u8ee2\u3055\u305b\u3001\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30fb\u30a8\u30f3\u30b8\u30f3\u304c\u4e0d\u7528\u610f\u306b\u7f72\u540d\u3092\u58ca\u3055\u306a\u3044\u3088\u3046\u306b\u3001\u5b89\u5b9a\u3057\u305f\u6b63\u898f\u5316\u3092\u4fdd\u8a3c\u3059\u308b\u3002\u305d\u3057\u3066 <strong>\uff24\uff2d\uff21\uff32\uff23<\/strong> \u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u3068DKIM\/SPF\u30c9\u30e1\u30a4\u30f3\u304c\u4e00\u81f4\u3059\u308b\u3088\u3046\u306b\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8a2d\u5b9a\u3059\u308b\uff08\u5fc5\u8981\u3067\u3042\u308c\u3070\u7de9\u548c\u307e\u305f\u306f\u53b3\u683c\uff09\u3002\u81ea\u5206\u306e\u4ee3\u308f\u308a\u306b\u8ab0\u304c\u9001\u4fe1\u3057\u3066\u3044\u308b\u304b\u3092\u76e3\u8996\u3059\u308b\u305f\u3081\u306b\u300crua\u300d\u30ec\u30dd\u30fc\u30c8\u3092\u4f7f\u3044\u3001\u300cpct\u300d\u306e\u5024\u3092\u5f90\u3005\u306b\u4e0a\u3052\u3066\u3044\u304d\u3001\u6700\u5f8c\u306b\u300cp=quarantine\u300d\u307e\u305f\u306f\u300cp=reject\u300d\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001\u4e00\u8cab\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u300csp=\u300d\u30dd\u30ea\u30b7\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002\u5b8c\u5168\u306a\u5c0e\u5165\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f <a href=\"https:\/\/webhosting.de\/ja\/%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e8%aa%8d%e8%a8%bc-spf-dkim-dmarc-%e3%82%ac%e3%82%a4%e3%83%89\/\">SPF\u3001DKIM\u3001DMARC\u30ac\u30a4\u30c9<\/a>.<\/p>\n\n<h2>\u30ea\u30b9\u30c8\u914d\u4fe1\u505c\u6b62\u3001\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u3001\u30d7\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u7ba1\u7406<\/h2>\n\n<p>\u79c1\u306f\u3001\u30e1\u30fc\u30eb\u5185\u306e\u76ee\u306b\u898b\u3048\u308b\u914d\u4fe1\u505c\u6b62\u30ea\u30f3\u30af\u306b\u4ee5\u4e0b\u3092\u8ffd\u52a0\u3057\u3066\u3044\u308b\u3002 <strong>\u914d\u4fe1\u505c\u6b62\u30d8\u30c3\u30c0\u30fc<\/strong> (\u73fe\u5728\u306e\u4ed5\u69d8\u3067\u306fmailto\u3068\u30ef\u30f3\u30af\u30ea\u30c3\u30af\uff09\u3002\u3053\u308c\u306b\u3088\u308a\u30af\u30ec\u30fc\u30e0\u304c\u6e1b\u308a\u3001\u771f\u5263\u3055\u304c\u4f1d\u308f\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u79c1\u306f <strong>\u30d7\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u30bb\u30f3\u30bf\u30fc<\/strong>\u3053\u308c\u306f\u3001\u53d7\u4fe1\u8005\u304c\u914d\u4fe1\u3092\u5b8c\u5168\u306b\u505c\u6b62\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u30c8\u30d4\u30c3\u30af\u3084\u914d\u4fe1\u983b\u5ea6\u3092\u9078\u629e\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u79c1\u306f\u300c\u7121\u8fd4\u4fe1\u300d\u306e\u65b0\u3057\u3044\u9001\u4fe1\u8005\u306f\u4f7f\u3044\u307e\u305b\u3093\u3002 <strong>\u7a4d\u6975\u7684\u4ea4\u6d41<\/strong> (\u8fd4\u4fe1\u3001\u9023\u7d61\u5148\u306b\u4fdd\u5b58\u3001\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u79fb\u52d5\uff09\u30d5\u30a3\u30eb\u30bf\u30fc\u4fe1\u53f7\u3092\u5f37\u5316\u3059\u308b\u3002<\/p>\n\n<h2>\u8868\uff1a\u3088\u304f\u3042\u308b\u539f\u56e0\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n<p>\u4ee5\u4e0b\u306e\u6982\u8981\u306f\u3001\u5178\u578b\u7684\u306a\u539f\u56e0\u3001\u5bfe\u5fdc\u3059\u308b\u75c7\u72b6\u3001\u9069\u5207\u306a\u5bfe\u7b56\u3092\u793a\u3057\u3066\u3044\u308b\u3002\u79c1\u306f\u3053\u308c\u3092\u624b\u3063\u53d6\u308a\u65e9\u3044 <strong>\u8fc5\u901f\u691c\u67fb<\/strong> \u5404\u6d3e\u9063\u306e\u524d\u306b\u3002\u8a8d\u8a3c\u3068\u30ea\u30b9\u30c8\u306e\u885b\u751f\u72b6\u614b\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u7279\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5c0f\u3055\u306a\u30df\u30b9\u304c\u7a4d\u307f\u91cd\u306a\u308b\u3068\u3001\u8a55\u4fa1\u304c\u4e0b\u304c\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u6700\u3082\u4e00\u822c\u7684\u306a\u3064\u307e\u305a\u304d\u3092\u907f\u3051\u308c\u3070\u3001\u6b21\u306e\u6d3e\u9063\u3067\u3088\u308a\u826f\u3044\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3057\u3087\u3046\u3002 <strong>\u53d7\u4fe1\u7387<\/strong>.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u539f\u56e0<\/th>\n      <th>\u75c7\u72b6<\/th>\n      <th>\u8fc5\u901f\u306a\u89e3\u6c7a<\/th>\n      <th>\u30ea\u30b9\u30af<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>SPF\/DKIM\/DMARC\u306e\u6b20\u843d<\/td>\n      <td>\u5927\u624b\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u30b9\u30d1\u30e0\u30d5\u30e9\u30b0<\/td>\n      <td>\u8a18\u9332\u306e\u8a2d\u5b9a\u3068\u30c6\u30b9\u30c8<\/td>\n      <td>\u9ad8\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>\u5f31\u3044\u30c9\u30e1\u30a4\u30f3\u8a55\u4fa1<\/td>\n      <td>\u767a\u9001\u5f8c\u306e\u9ad8\u3044\u30b9\u30d1\u30e0\u7387<\/td>\n      <td>\u9001\u4fe1\u901f\u5ea6\u3092\u4e0b\u3052\u3001\u30ea\u30b9\u30c8\u3092\u6574\u7406\u3059\u308b<\/td>\n      <td>\u9ad8\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>\u8cfc\u5165\u307e\u305f\u306f\u65e7\u8ca9\u58f2\u4ee3\u7406\u5e97<\/td>\n      <td>\u30d0\u30a6\u30f3\u30b9\u3001\u82e6\u60c5\u3001\u30b9\u30d1\u30e0\u30c8\u30e9\u30c3\u30d7<\/td>\n      <td>\u30c0\u30d6\u30eb\u30aa\u30d7\u30c8\u30a4\u30f3\u3001\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u9023\u7d61\u5148\u306e\u524a\u9664<\/td>\n      <td>\u9ad8\u3044<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30b9\u30d1\u30e0\u7528\u8a9e\u3092\u542b\u3080\u4ef6\u540d<\/td>\n      <td>\u4f4e\u7a7a\u98db\u884c\u3001\u30b9\u30d1\u30e0\u5206\u985e<\/td>\n      <td>\u4e2d\u7acb\u7684\u3067\u660e\u78ba\u306a\u4ef6\u540d<\/td>\n      <td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td>\n    <\/tr>\n    <tr>\n      <td>\u753b\u50cf\u3092\u591a\u7528\u3057\u305f\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8<\/td>\n      <td>\u8868\u793a\u30a8\u30e9\u30fc\u3001\u30b9\u30d1\u30e0\u30d2\u30c3\u30c8<\/td>\n      <td>\u3088\u308a\u591a\u304f\u306e\u9023\u7d9a\u30c6\u30ad\u30b9\u30c8\u3001alt\u30c6\u30ad\u30b9\u30c8\u3001\u3088\u308a\u5c11\u306a\u3044\u30ea\u30f3\u30af<\/td>\n      <td>\u30df\u30c7\u30a3\u30a2\u30e0<\/td>\n    <\/tr>\n    <tr>\n      <td>\u914d\u4fe1\u505c\u6b62\u30ea\u30f3\u30af\u306e\u6b20\u843d<\/td>\n      <td>\u5897\u52a0\u3059\u308b\u30b9\u30d1\u30e0\u82e6\u60c5<\/td>\n      <td>\u30aa\u30d7\u30c8\u30a2\u30a6\u30c8\u3092\u898b\u3084\u3059\u304f\u8868\u793a\u3059\u308b<\/td>\n      <td>\u9ad8\u3044<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\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\/2025\/10\/spamfilteranalyse_nacht8981.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u6d3e\u9063\u30ea\u30b9\u30c8\u3092\u7ba1\u7406\u3057\u3001\u6cd5\u7684\u78ba\u5b9f\u6027\u3092\u3082\u3063\u3066\u884c\u52d5\u3059\u308b\u3002<\/h2>\n\n<p>\u30a2\u30c9\u30ec\u30b9\u306e\u53ce\u96c6\u306f <strong>\u30c0\u30d6\u30eb\u30aa\u30d7\u30c8\u30a4\u30f3<\/strong> \u305d\u3057\u3066\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3068\u540c\u610f\u3092\u6587\u66f8\u5316\u3059\u308b\u3002\u3059\u3079\u3066\u306e\u30cb\u30e5\u30fc\u30b9\u30ec\u30bf\u30fc\u306b\u306f\u3001\u76ee\u306b\u898b\u3048\u308b\u914d\u4fe1\u505c\u6b62\u30ea\u30f3\u30af\u3068\u3001\u7f72\u540d\u306b\u7269\u7406\u7684\u306a\u30a2\u30c9\u30ec\u30b9\u3092\u8a18\u8f09\u3057\u3066\u3044\u307e\u3059\u3002\u30b9\u30d1\u30e0\u30c8\u30e9\u30c3\u30d7\u3084\u30cf\u30fc\u30c9\u30d0\u30a6\u30f3\u30b9\u3092\u907f\u3051\u308b\u305f\u3081\u3001\u5b9a\u671f\u7684\u306b\u30a2\u30af\u30c6\u30a3\u30d6\u3067\u306a\u3044\u30b3\u30f3\u30bf\u30af\u30c8\u3092\u524a\u9664\u3057\u3066\u3044\u307e\u3059\u3002\u82e6\u60c5\u306f\u914d\u4fe1\u7387\u306b\u76f4\u63a5\u5f71\u97ff\u3059\u308b\u305f\u3081\u3001\u6ce8\u610f\u6df1\u304f\u898b\u5b88\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ea\u30b9\u30c8\u3092\u5065\u5168\u306a\u72b6\u614b\u306b\u4fdd\u3061\u3001\u4eca\u5f8c\u306e\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u3092\u660e\u78ba\u306a\u5f62\u3067\u958b\u59cb\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u30b3\u30f3\u30d5\u30a3\u30c7\u30f3\u30b9\u30fb\u30dc\u30fc\u30ca\u30b9<\/strong>.<\/p>\n\n<h2>\u8a3a\u65ad\uff1a\u5f15\u304d\u91d1\u306e\u898b\u3064\u3051\u65b9<\/h2>\n\n<p>\u96fb\u5b50\u30e1\u30fc\u30eb\u304c\u884c\u65b9\u4e0d\u660e\u306b\u306a\u3063\u305f\u3068\u304d\u3001\u79c1\u306f\u307e\u305a\u3001\u6b21\u306e\u5834\u6240\u3092\u63a2\u3057\u307e\u3059\u3002 <strong>\u30d8\u30c3\u30c0\u30fc<\/strong>.\u305d\u3053\u3067\u30b9\u30d1\u30e0\u306e\u30b9\u30b3\u30a2\u3001\u30c1\u30a7\u30c3\u30af\u30d1\u30b9\u3001\u8a8d\u8a3c\u7d50\u679c\u3001\u30d6\u30ed\u30c3\u30af\u30b7\u30b9\u30c6\u30e0\u306e\u8868\u793a\u3092\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3053\u306e\u60c5\u5831\u306b\u3088\u308a\u3001\u30b7\u30b0\u30cd\u30c1\u30e3\u30fc\u306e\u6b20\u843d\u3084\u9001\u4fe1\u30db\u30b9\u30c8\u306e\u554f\u984c\u306a\u3069\u3001\u539f\u56e0\u304c\u6570\u5206\u3067\u5224\u660e\u3059\u308b\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u30a2\u30d7\u30ed\u30fc\u30c1\u3068\u3057\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u3092\u304a\u52e7\u3081\u3059\u308b\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e9%9b%bb%e5%ad%90%e3%83%a1%e3%83%bc%e3%83%ab%e3%81%ae%e3%83%98%e3%83%83%e3%83%80%e3%83%bc%e3%82%92%e5%88%86%e6%9e%90%e3%81%97%e3%80%81%e3%82%b9%e3%83%91%e3%83%a0%e3%81%ae%e9%80%81%e4%bf%a1%e5%85%83\/\">\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u306e\u5206\u6790<\/a> \u3092\u3001\u660e\u78ba\u306a\u624b\u9806\u3067\u5b9f\u884c\u3059\u308b\u3002\u52a0\u3048\u3066\u3001mail-tester.com\u3092\u4f7f\u3063\u305f\u30c6\u30b9\u30c8\u3084DNS\u30ed\u30b0\u3092\u898b\u308b\u3053\u3068\u3067\u3001\u8cb4\u91cd\u306a\u60c5\u5831\u304c\u5f97\u3089\u308c\u308b\u3002 <strong>\u6307\u6a19<\/strong>.<\/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\/2025\/10\/entwicklerarbeitsplatz_spamtipps_2947.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30d0\u30a6\u30f3\u30b9\u306e\u7406\u89e3\u3068\u7ba1\u7406<\/h2>\n\n<p>\u79c1\u306f\u6b21\u306e\u3088\u3046\u306b\u533a\u5225\u3057\u3066\u3044\u308b\u3002 <strong>\u30cf\u30fc\u30c9\u30d0\u30a6\u30f3\u30c9<\/strong> (\u30e6\u30fc\u30b6\u30fc\u4e0d\u660e\u300d\u306a\u3069\u306e\u6c38\u4e45\u30a8\u30e9\u30fc\uff09\u304b\u3089 <strong>\u30bd\u30d5\u30c8\u30d0\u30a6\u30f3\u30c9<\/strong> (\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u4e00\u676f\u306b\u306a\u3063\u3066\u3044\u308b\u306a\u3069\u306e\u4e00\u6642\u7684\u306a\u3082\u306e\uff09\u3002\u30cf\u30fc\u30c9\u30d0\u30a6\u30f3\u30b9\u306f\u3059\u3050\u306b\u524a\u9664\u3057\u307e\u3059\u3002\u30bd\u30d5\u30c8\u30d0\u30a6\u30f3\u30b9\u306e\u5834\u5408\u306f\u3001\u4f55\u5ea6\u304b\u8a66\u3057\u305f\u5f8c\u306b <em>\u30b5\u30f3\u30bb\u30c3\u30c8<\/em>-\u30d7\u30ed\u30bb\u30b9\u30024xx\u30b3\u30fc\u30c9\u304c\u7e70\u308a\u8fd4\u3057\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u306f\u3001\u30ec\u30fc\u30c8\u5236\u9650\u3084\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u554f\u984c\u304c\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u306f\u3001\u901f\u5ea6\u3092\u4e0b\u3052\u3001\u30bb\u30b0\u30e1\u30f3\u30c8\u306e\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3057\u3001\u30b8\u30e7\u30d6\u9593\u306e\u4f11\u61a9\u3092\u5897\u3084\u3057\u307e\u3059\u3002\u30ed\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\uff08info@\u3001sales@\uff09\u306f\u82e6\u60c5\u306b\u3064\u306a\u304c\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u53b3\u3057\u304f\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u79c1\u306f\u3001\u3059\u3079\u3066\u306e\u82e6\u60c5\u309210\u4ef6\u306e\u914d\u4fe1\u505c\u6b62\u3068\u3057\u3066\u6271\u3044\u3001\u30aa\u30d7\u30c8\u30a4\u30f3\u3059\u308b\u969b\u306b\u660e\u78ba\u306a\u671f\u5f85\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u82e6\u60c5\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u307e\u3059\u3002<\/p>\n\n<h2>\u30b3\u30f3\u30c6\u30f3\u30c4\u3068\u30c8\u30e9\u30c3\u30ad\u30f3\u30b0\u306e\u30af\u30ea\u30fc\u30f3\u306a\u8abf\u6574<\/h2>\n\n<p>\u6d3e\u9063\u3059\u308b <strong>MIME multipart\/alternative<\/strong> \u3092\u30d7\u30ec\u30fc\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3057\u3001\u6b63\u3057\u3044\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff08UTF-8\uff09\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u307e\u305f <strong>\u30c8\u30e9\u30c3\u30ad\u30f3\u30b0\u30fb\u30c9\u30e1\u30a4\u30f3<\/strong> \u79c1\u306e\u9001\u4fe1\u8005\u30c9\u30e1\u30a4\u30f3\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30ea\u30f3\u30af\u304c\u5916\u56fd\u98a8\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002 <strong>\u30ea\u30f3\u30af\u30b7\u30e7\u30fc\u30c8\u30ca\u30fc<\/strong> \u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u304b\u3089\u3060\u3002\u30af\u30ea\u30c3\u30d4\u30f3\u30b0\u306e\u5f71\u97ff\u3092\u8efd\u6e1b\u3059\u308b\u305f\u3081\u306b\u3001\u5168\u4f53\u306e\u30b5\u30a4\u30ba\u3092\u63a7\u3048\u3081\u306b\u3057\u3001\u9577\u3059\u304e\u308bHTML\u69cb\u9020\u306f\u907f\u3051\u3066\u3044\u308b\u3002\u307e\u305f <strong>\u30d7\u30ec\u30d8\u30c3\u30c0\u30fc<\/strong> \u30c8\u30ea\u30ac\u30fc\u3068\u306a\u308b\u8a00\u8449\u3092\u4f7f\u308f\u305a\u3001\u6838\u3068\u306a\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8981\u7d04\u3059\u308b\u3002\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306e\u4f7f\u7528\u306f\u63a7\u3048\u3081\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30ea\u30b9\u30af\u306e\u9ad8\u3044\u5f62\u5f0f\uff08\u30de\u30af\u30ed\u4ed8\u304d\u306eOffice\u30d5\u30a1\u30a4\u30eb\u306a\u3069\uff09\u306f\u907f\u3051\u3001\u5b89\u5168\u306a\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30da\u30fc\u30b8\u3078\u306e\u30ea\u30f3\u30af\u3092\u597d\u307f\u307e\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u9001\u4fe1\u5143\u30c9\u30e1\u30a4\u30f3\u3001DKIM\u30c9\u30e1\u30a4\u30f3\u3001\u30ea\u30f3\u30af\u5148\u30c9\u30e1\u30a4\u30f3\u304c1\u3064\u306e\u30bd\u30fc\u30b9\u304b\u3089\u767a\u4fe1\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u308b\u305f\u3081\u3001\u30b7\u30b0\u30ca\u30eb\u306e\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u308b\u3002<\/p>\n\n<h2>\u30d5\u30a9\u30ef\u30fc\u30c7\u30a3\u30f3\u30b0\u3001SPF\u3001ARC<\/h2>\n\n<p>\u79c1\u306f\u6b21\u306e\u3053\u3068\u3092\u8003\u616e\u306b\u5165\u308c\u3066\u3044\u308b\u3002 <strong>\u8ee2\u9001<\/strong> \u8ee2\u9001\u5148\u30b5\u30fc\u30d0\u30fc\u304cSPF\u30ec\u30b3\u30fc\u30c9\u306b\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u306fSPF\u3060\u3051\u306b\u983c\u3089\u305a\u3001\u5b89\u5b9a\u3057\u305f <strong>\u30c7\u30a3\u30fc\u30b1\u30fc\u30a2\u30a4\u30a8\u30e0<\/strong>-\u7f72\u540d\u53ef\u80fd\u306a\u9650\u308a <strong>\u30a2\u30fc\u30af<\/strong> (Authenticated Received Chain\uff09\u3092\u4f7f\u3063\u3066\u3001\u30c0\u30a6\u30f3\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u8a8d\u8a3c\u3092\u30c8\u30ec\u30fc\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u30af\u30ea\u30fc\u30f3\u306a <strong>\u30a8\u30b9\u30a2\u30fc\u30eb\u30a8\u30b9<\/strong>-\u9001\u4fe1\u8005\u30a2\u30c9\u30ec\u30b9\u3092\u6b63\u3057\u304f\u66f8\u304d\u63db\u3048\u308b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306e\u5b9f\u88c5\u3002<\/p>\n\n<h2>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306e\u6697\u53f7\u5316\u3068\u30dd\u30ea\u30b7\u30fc\u30fb\u30b7\u30b0\u30ca\u30eb<\/h2>\n\n<p>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f <strong>\u30c6\u30a3\u30fc\u30a8\u30eb\u30a8\u30b9<\/strong> \u307e\u305f\u3001\u53d7\u4fe1\u8005\u304c\u6697\u53f7\u5316\u3055\u308c\u305f\u914d\u4fe1\u3057\u304b\u53d7\u3051\u5165\u308c\u306a\u3044\u304b\u3069\u3046\u304b\u3092\u76e3\u8996\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u305d\u3057\u3066 <strong>MTA-STS<\/strong> \u305d\u3057\u3066 <strong>TLS-RPT<\/strong> \u79c1\u306f\u3001\u4e2d\u9593\u8005\u30ea\u30b9\u30af\u3092\u6700\u5c0f\u5316\u3059\u308b\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u8a2d\u5b9a\u3057\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u306e\u554f\u984c\u306b\u95a2\u3059\u308b\u30ec\u30dd\u30fc\u30c8\u3092\u79c1\u306b\u63d0\u4f9b\u3059\u308b\u3002\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u91cd\u8981\u306a\u74b0\u5883\u3067\u306f\u3001DANE\/TLSA\u3082\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u5bfe\u7b56\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u9ad8\u3081\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u9593\u63a5\u7684\u306a\u5f37\u5316\u306b\u3082\u3064\u306a\u304c\u308b\u3002 <strong>\u672c\u6c17\u5ea6\u30b7\u30b0\u30ca\u30eb<\/strong> \u79c1\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u3002<\/p>\n\n<h2>\u7df4\u7fd2\u3067\u306e\u30a6\u30a9\u30fc\u30e0\u30a2\u30c3\u30d7\u3068\u97f3\u91cf\u8abf\u6574<\/h2>\n\n<p>\u65b0\u3057\u3044\u30bb\u30f3\u30c0\u30fc\u3092\u7acb\u3061\u4e0a\u3052\u308b\u3068\u304d\u306f\u3001\u975e\u5e38\u306b\u30a8\u30f3\u30b2\u30fc\u30b8\u30e1\u30f3\u30c8\u306e\u9ad8\u3044\u30bb\u30b0\u30e1\u30f3\u30c8\uff08\u6700\u8fd1\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u306a\u3063\u305f\u958b\u5c01\u8005\uff0f\u30af\u30ea\u30c3\u30af\u8005\uff09\u304b\u3089\u59cb\u3081\u3001\u6bce\u65e5\u307e\u305f\u306f\u6bce\u9031\u3001\u660e\u78ba\u306a\u6bb5\u968e\u3092\u8e0f\u3093\u3067\u898f\u6a21\u3092\u62e1\u5927\u3057\u3066\u3044\u304f\u3002\u4e00\u3064\u306e\u53d7\u4fe1\u7bb1\u30d5\u30a1\u30df\u30ea\u30fc\u306b\u8ca0\u8377\u304c\u304b\u304b\u308a\u3059\u304e\u306a\u3044\u3088\u3046\u306b\u3001\u30c9\u30e1\u30a4\u30f3\u3084\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u610f\u56f3\u7684\u306b\u5909\u3048\u3066\u3044\u308b\u3002\u3082\u3057 <strong>\u30af\u30ec\u30fc\u30e0\u7387<\/strong> \u30cd\u30ac\u30c6\u30a3\u30f4\u306b\u306a\u3063\u305f\u308a\u30014xx\u306e\u30ec\u30fc\u30c8\u304c\u4e0a\u304c\u3063\u305f\u308a\u3057\u305f\u5834\u5408\u3001\u79c1\u306f\u305d\u306e\u30dc\u30ea\u30e5\u30fc\u30e0\u3092\u51cd\u7d50\u3057\u3001\u30ea\u30b9\u30c8\u3068\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u6539\u5584\u3057\u3001\u305d\u308c\u304b\u3089\u7d9a\u3051\u308b\u3002\u3053\u308c\u3067\u5b89\u5b9a\u3057\u305f <strong>\u4fe1\u983c\u306e\u9053<\/strong>\u30d4\u30fc\u30af\u6642\u306e\u8ca0\u8377\u306b\u3082\u8010\u3048\u308b\u3002<\/p>\n\n<h2>BIMI\u3068\u8996\u899a\u7684\u4fe1\u983c\u30b7\u30b0\u30ca\u30eb<\/h2>\n\n<p>DMARC\u304c \"\u9694\u96e2 \"\u307e\u305f\u306f \"\u62d2\u5426 \"\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u3066\u3001\u79c1\u306e\u30e1\u30fc\u30eb\u304c\u4e00\u8cab\u3057\u3066\u8a8d\u8a3c\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u79c1\u306f\u305d\u308c\u3092\u6709\u52b9\u306b\u3057\u307e\u3059\u3002 <strong>BIMI<\/strong>.\u3053\u308c\u306b\u3088\u308a\u3001\u4e92\u63db\u6027\u306e\u3042\u308b\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u79c1\u306e\u30d6\u30e9\u30f3\u30c9\u30ed\u30b4\u304c\u78ba\u5b9f\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u79c1\u306f\u304d\u308c\u3044\u306aSVG\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u4f7f\u3044\u3001\u5b9a\u671f\u7684\u306b\u8868\u793a\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002BIMI\u306f\u6280\u8853\u57fa\u76e4\u3092\u7f6e\u304d\u63db\u3048\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u305d\u306e\u6280\u8853\u57fa\u76e4\u3092\u5f37\u5316\u3059\u308b\u3082\u306e\u3067\u3059\u3002 <strong>\u30d6\u30e9\u30f3\u30c9\u8a8d\u77e5<\/strong> \u305d\u3057\u3066\u3001\u4ea4\u6d41\u3092\u5897\u3084\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n<h2>\u518d\u5951\u7d04\u3068\u30b5\u30f3\u30bb\u30c3\u30c8\u30fb\u30dd\u30ea\u30b7\u30fc<\/h2>\n\n<p>\u30a2\u30af\u30c6\u30a3\u30d6\u3067\u306a\u3044\u30b3\u30f3\u30bf\u30af\u30c8\u3092\u3044\u3064\u307e\u3067\u3082\u653e\u7f6e\u3057\u3066\u304a\u304f\u3053\u3068\u306f\u3057\u306a\u3044\u3002\u305d\u306e\u4ee3\u308f\u308a <strong>\u30ea\u30fb\u30a8\u30f3\u30b2\u30fc\u30b8\u30e1\u30f3\u30c8\u30fb\u30ad\u30e3\u30f3\u30da\u30fc\u30f3<\/strong> \u660e\u78ba\u306a\u4ef6\u540d\u3001\u4ed8\u52a0\u4fa1\u5024\u306e\u3042\u308b\u30aa\u30d5\u30a1\u30fc\u3001\u30c8\u30d4\u30c3\u30af\u3084\u983b\u5ea6\u3092\u5909\u66f4\u3059\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u4ed8\u304d\u3002\u4f55\u5ea6\u8a66\u307f\u3066\u3082\u8fd4\u4fe1\u304c\u306a\u3044\u4eba\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u30e1\u30fc\u30eb\u304c\u9001\u3089\u308c\u308b\u3002 <strong>\u30b5\u30f3\u30bb\u30c3\u30c8\u671f<\/strong> \u305d\u3057\u3066\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u304b\u3089\u524a\u9664\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30b9\u30d1\u30e0\u30c8\u30e9\u30c3\u30d7\u306e\u30ea\u30b9\u30af\u304c\u6e1b\u308a\u3001\u79c1\u306e\u5e73\u5747\u30b7\u30b0\u30ca\u30eb\u306f\u9ad8\u3044\u307e\u307e\u3067\u3059\u3002<\/p>\n\n<h2>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3068\u4e3b\u306a\u6570\u5024<\/h2>\n\n<p>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3054\u3068\u306b\u958b\u5c01\u3001\u30af\u30ea\u30c3\u30af\u3001\u30d0\u30a6\u30f3\u30b9\u3001\u82e6\u60c5\u3001\u30b9\u30d1\u30e0\u30d5\u30a9\u30eb\u30c0\u30fc\u7387\u3092\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002\u3088\u308a\u8a73\u7d30\u306a\u76e3\u8996\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u5927\u898f\u6a21\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u30dd\u30b9\u30c8\u30de\u30b9\u30bf\u30fc\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3001\u4ee5\u4e0b\u3092\u5206\u6790\u3057\u307e\u3059\u3002 <strong>DMARC\u96c6\u8a08\u30ec\u30dd\u30fc\u30c8<\/strong> \u30aa\u30d5\u3002\u79c1\u306e\u76ee\u6a19\u5024\uff1a\u30af\u30ec\u30fc\u30e0\u7387\u306f0.1 %\u4ee5\u4e0b\u3001\u30cf\u30fc\u30c9\u30d0\u30a6\u30f3\u30b9\u7387\u306f0.5 %\u4ee5\u4e0b\u3001\u4e0d\u660e\u306a\u53d7\u4fe1\u8005\u306f1 %\u4ee5\u4e0b\u3002\u79c1\u306f\u3001\u660e\u78ba\u306a\u4eee\u8aac\uff08\u30c6\u30af\u30cb\u30c3\u30af\u2192\u30b3\u30f3\u30c6\u30f3\u30c4\u2192\u983b\u5ea6\uff09\u3092\u6301\u3063\u3066\u9038\u8131\u3092\u6271\u3044\u3001\u5e83\u304f\u5c55\u958b\u3059\u308b\u524d\u306b\u3001\u5c0f\u3055\u306a\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u5bfe\u3057\u3066\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3055\u308c\u305f\u65b9\u6cd5\u3067\u5909\u66f4\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002<\/p>\n\n<h2>\u30b9\u30c6\u30c3\u30d7\u30fb\u30d0\u30a4\u30fb\u30b9\u30c6\u30c3\u30d7\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n<p>\u79c1\u306f\u307e\u305a\u3001\u5927\u624b\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u8907\u6570\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3078\u306e\u914d\u9054\u30b5\u30f3\u30d7\u30eb\u304b\u3089\u59cb\u3081\u3001\u305d\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u6bd4\u8f03\u3059\u308b\u3002 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