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<strong>\u30a2\u30bf\u30c3\u30af\u30fb\u30b5\u30fc\u30d5\u30a7\u30b9<\/strong>.<\/p>\n\n<h2>\u9ad8\u53ef\u7528\u6027\u3068\u7dca\u6025\u6642\u306e\u30b3\u30f3\u30bb\u30d7\u30c8<\/h2>\n\n<p>\u79c1\u306fRTO\/RPO\u76ee\u6a19\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\uff1a\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u306f\u3069\u308c\u304f\u3089\u3044\u306e\u6642\u9593\u30c0\u30a6\u30f3\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u304b\u3001\u307e\u305f\u3069\u308c\u304f\u3089\u3044\u306e\u30c7\u30fc\u30bf\u640d\u5931\u304c\u8a31\u5bb9\u7bc4\u56f2\u304b\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3068\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u983b\u5ea6\u304c\u6c7a\u307e\u308a\u307e\u3059\u30022\u3064\u76ee\u306eMX\u304c\u610f\u5473\u3092\u6301\u3064\u306e\u306f\u3001\u540c\u3058\u3088\u3046\u306b\u5b89\u5168\u306b\u8a2d\u5b9a\u3055\u308c\u3001\u30b9\u30d1\u30e0\u30c8\u30e9\u30c3\u30d7\u3068\u3057\u3066\u60aa\u7528\u3055\u308c\u306a\u3044\u5834\u5408\u3060\u3051\u3067\u3059\u3002IMAP\u306e\u30ec\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u3001Dovecot\u30ec\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u3088\u3046\u306a\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u5229\u7528\u3057\u3066\u3001\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3092\u3059\u3050\u306b\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u3068\u30aa\u30d5\u30b5\u30a4\u30c8\u30fb\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u5b9a\u671f\u7684\u306a\u30ea\u30b9\u30c8\u30a2\u30c6\u30b9\u30c8\u3067\u88dc\u5b8c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u969c\u5bb3\u306b\u5099\u3048\u3066\u3001UPS\u3084\u30a2\u30a6\u30c8\u30aa\u30d6\u30d0\u30f3\u30c9\u30fb\u30a2\u30af\u30bb\u30b9\u3001\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u30fb\u30b1\u30fc\u30b9\u306b\u5099\u3048\u305f\u660e\u78ba\u306a\u30e9\u30f3\u30d6\u30c3\u30af\u306a\u3069\u306e\u8a08\u753b\u3082\u7acb\u3066\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a6\u30c9\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u306f\u3001\u30a4\u30e1\u30fc\u30b8\u3068\u69cb\u6210\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u6e96\u5099\u3057\u3066\u304a\u304d\u3001\u65b0\u3057\u3044\u30b7\u30b9\u30c6\u30e0\u3092\u6570\u5206\u3067\u30d7\u30ed\u30d3\u30b8\u30e7\u30cb\u30f3\u30b0\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u524d\u306bDNS\u306eTTL\u3092\u4e00\u6642\u7684\u306b\u4f4e\u304f\u8a2d\u5b9a\u3057\u3001\u79fb\u52d5\u4e2d\u306b\u7d20\u65e9\u304f\u30d4\u30dc\u30c3\u30c8\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h2>\u5b9f\u88c5\u306e\u5b9f\u969b\uff1a\u30b7\u30b9\u30c6\u30e0\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u304b\u3089\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u307e\u3067<\/h2>\n\n<p>\u65b0\u3057\u3044\u6700\u65b0\u306eLinux\uff08Ubuntu LTS\u306a\u3069\uff09\u304b\u3089\u59cb\u3081\u3066\u3001\u5fc5\u8981\u306a\u30b5\u30fc\u30d3\u30b9\u3060\u3051\u3092\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3059\u308b\u3002 <strong>\u4e00\u8cab\u3057\u305f<\/strong>.\u305d\u308c\u304b\u3089DNS\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u8a2d\u5b9a\u3057\u305f\uff1a\u30db\u30b9\u30c8\u306bA\/AAA\u3001\u30c9\u30e1\u30a4\u30f3\u306bMX\u3001IP\u306bPTR\/rDNS\u3001\u3055\u3089\u306bSPF\/DKIM\/DMARC\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u305d\u308c\u304b\u3089\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\uff08Postfix\/Dovecot\u3084Mail-in-a-Box\u306e\u3088\u3046\u306a\u81ea\u52d5\u5316\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u306a\u3069\uff09\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3001TLS\u3001\u30b5\u30d6\u30df\u30c3\u30b7\u30e7\u30f3\uff08587\/465\uff09\u3001IMAPS\uff08993\uff09\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3001\u30af\u30a9\u30fc\u30bf\u3001\u30b9\u30d1\u30e0\u30d5\u30a3\u30eb\u30bf\u3001\u30a6\u30a3\u30eb\u30b9\u30b9\u30ad\u30e3\u30ca\u304c\u305d\u308c\u306b\u7d9a\u304d\u3001\u9001\u4fe1\u3001\u53d7\u4fe1\u3001\u8a3c\u660e\u66f8\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u30b9\u30bf\u30fc\u30c8\u306b\u306f\u3001\u660e\u78ba\u306a <a href=\"https:\/\/webhosting.de\/ja\/%e3%82%bb%e3%82%ad%e3%83%a5%e3%82%a2%e3%83%a1%e3%83%bc%e3%83%ab%e3%82%b5%e3%83%bc%e3%83%90%e3%83%bc%e8%a8%ad%e5%ae%9a%e6%89%8b%e9%a0%86\/\">\u96fb\u5b50\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u8aac\u660e<\/a>\u91cd\u8981\u306a\u30b9\u30c6\u30c3\u30d7\u3092\u898b\u843d\u3068\u3055\u305a\u3001\u8fc5\u901f\u306b\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u3092\u5b8c\u4e86\u3055\u305b\u308b\u305f\u3081\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\/09\/mailserver-hosting-sicherheit-8431.png\" alt=\"\" width=\"1536\" height=\"1024\" 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<strong>\u30a6\u30a7\u30d6\u30e1\u30fc\u30eb<\/strong> \u3092\u4f7f\u3044\u3001\u30d7\u30c3\u30b7\u30e5\u578b\u901a\u77e5\u306e\u305f\u3081\u306bIMAP IDLE\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u307e\u3059\u3002Sieve\u3092\u4f7f\u3063\u3066\u3001\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\u3001\u8ee2\u9001\u3001\u81ea\u52d5\u8fd4\u4fe1\u3001\u5171\u6709\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u30eb\u30fc\u30eb\u3092\u5236\u5fa1\u3057\u3066\u3044\u307e\u3059\u3002\u30ab\u30ec\u30f3\u30c0\u30fc\u3068\u9023\u7d61\u5148\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001CalDAV\/CardDAV\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u7d71\u5408\u3057\u3001\u30af\u30ea\u30fc\u30f3\u306a\u8a8d\u8a3c\u3068\u5171\u6709\u30b3\u30f3\u30bb\u30d7\u30c8\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002\u79c1\u306f\u30af\u30a9\u30fc\u30bf\u3092\u900f\u660e\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30d0\u30a6\u30f3\u30b9\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u3060\u3051\u3067\u306a\u304f\u3001\u30e1\u30e2\u30ea\u304c\u4e0d\u8db3\u3057\u305f\u3068\u304d\u306b\u30e6\u30fc\u30b6\u30fc\u304c\u3059\u3050\u306b\u308f\u304b\u308b\u3088\u3046\u306b\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\/2025\/09\/mailserver-hosting-6291.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u5931\u6557\u306e\u306a\u3044\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3<\/h2>\n\n<p>\u79c1\u306f\u6bb5\u968e\u7684\u306b\u79fb\u884c\u3092\u8a08\u753b\u3057\u3066\u3044\u308b\uff1a\u307e\u305aDNS\u306eTTL\u3092\u4e0b\u3052\u3001\u6b21\u306bIMAP\u540c\u671f\u3067\u65e2\u5b58\u306e\u30e1\u30fc\u30eb\u3092\u5c11\u3057\u305a\u3064\u30b3\u30d4\u30fc\u3059\u308b\u3002\u4e26\u884c\u3057\u3066\u3001\u79fb\u884c\u4e2d\u306b\u4f55\u3082\u5931\u308f\u308c\u306a\u3044\u3088\u3046\u306b\u4e8c\u91cd\u914d\u4fe1\u3084\u8ee2\u9001\u3092\u8a2d\u5b9a\u3059\u308b\u3002\u4e8b\u524d\u306b\u30a8\u30a4\u30ea\u30a2\u30b9\u3001\u914d\u4fe1\u30ea\u30b9\u30c8\u3001\u8ee2\u9001\u3092\u6587\u66f8\u5316\u3057\u3001\u30a2\u30c9\u30ec\u30b9\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002\u5207\u308a\u66ff\u3048\u65e5\u306b\u306f\u3001MX\u3092\u66f4\u65b0\u3057\u3001\u30ed\u30b0\u3001\u30d0\u30a6\u30f3\u30b9\u3001TLS\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u76f4\u3061\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u660e\u78ba\u306a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u30d7\u30e9\u30f3\uff08\u65e7MX\u3092\u542b\u3080\uff09\u306f\u3001\u4e88\u671f\u305b\u306c\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306e\u5b89\u5168\u6027\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n\n<h2>\u30cf\u30fc\u30c9\u30cb\u30f3\u30b0\uff1a\u5468\u8fba\u304b\u3089\u53d7\u4fe1\u30c8\u30ec\u30a4\u307e\u3067<\/h2>\n\n<p>\u3092\u958b\u304f\u3060\u3051\u3060\u3002 <strong>\u6e2f\u6e7e<\/strong>\u5371\u967a\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Fail2ban\u306f\u7e70\u308a\u8fd4\u3055\u308c\u308b\u5931\u6557\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3001\u30ec\u30fc\u30c8\u5236\u9650\u306f\u30d6\u30eb\u30fc\u30c8\u30d5\u30a9\u30fc\u30b9\u3092\u6291\u5236\u3059\u308b\u3002\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u6226\u7565\u306b\u306f\u3001\u6bce\u65e5\u306e\u5897\u5206\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u306b\u52a0\u3048\u3001\u7dca\u6025\u6642\u306e\u305f\u3081\u306e\u30aa\u30d5\u30e9\u30a4\u30f3\u30fb\u30b3\u30d4\u30fc\u304c\u542b\u307e\u308c\u307e\u3059\u3002\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306f\u3001\u30ad\u30e5\u30fc\u306e\u9577\u3055\u3001\u5229\u7528\u7387\u3001TLS\u30a8\u30e9\u30fc\u3001\u8a3c\u660e\u66f8\u306e\u5b9f\u884c\u6642\u9593\u3001\u30c7\u30a3\u30b9\u30af\u306e\u5065\u5168\u6027\u3001\u30ed\u30b0\u306e\u7570\u5e38\u306a\u3069\u3092\u8abf\u3079\u3066\u3044\u308b\u3002\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306f\u5b9a\u671f\u7684\u306b <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%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%e5%ae%9f%e8%b7%b5%e3%82%ac%e3%82%a4%e3%83%89-%e3%82%b5%e3%82%a4%e3%83%90%e3%83%bc\/\">\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a> \u9699\u9593\u304c\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3002<\/p>\n\n<h2>\u65e5\u5e38\u751f\u6d3b\u306b\u304a\u3051\u308b\u76e3\u8996\u3068\u89b3\u5bdf\u53ef\u80fd\u6027<\/h2>\n\n<p>\u4fe1\u983c\u3067\u304d\u308b 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<strong>\u30c7\u30fc\u30bf\u4fdd\u8b77<\/strong>- \u3068\u4fdd\u5b58\u8981\u4ef6\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u79c1\u306f\u3001\u660e\u78ba\u306a\u4fdd\u5b58\u671f\u9593\u3092\u5b9a\u7fa9\u3057\u3001\u76e3\u67fb\u8a3c\u660e\u4ed8\u304d\u306e\u30a2\u30fc\u30ab\u30a4\u30d6\u3092\u5b9f\u88c5\u3057\u3001\u6280\u8853\u7684\u304a\u3088\u3073\u7d44\u7e54\u7684\u5bfe\u7b56\u3092\u6587\u66f8\u5316\u3057\u307e\u3059\u3002\u9759\u6b62\u6642\u306e\u6697\u53f7\u5316\uff08\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u306e\u5b8c\u5168\u6697\u53f7\u5316\u306a\u3069\uff09\u304a\u3088\u3073\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u30ec\u30d9\u30eb\u3067\u306e\u6697\u53f7\u5316\u306b\u3088\u308a\u3001\u76d7\u96e3\u3084\u4e0d\u6b63\u30a2\u30af\u30bb\u30b9\u304b\u3089\u4fdd\u8b77\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3068\u540c\u69d8\u306b\u3001\u9375\u306e\u7ba1\u7406\u3068\u30ea\u30ab\u30d0\u30ea\u30fc\u306e\u30d7\u30ed\u30bb\u30b9\uff08\u9375\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3001\u9375\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\uff09\u3082\u5fb9\u5e95\u7684\u306b\u8a08\u753b\u3057\u307e\u3059\u3002\u7279\u306b\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u901a\u4fe1\u306b\u3064\u3044\u3066\u306f\u3001\u30a8\u30f3\u30c9\u30c4\u30fc\u30a8\u30f3\u30c9\u306e\u624b\u7d9a\u304d\uff08S\/MIME\u3084PGP\u306a\u3069\uff09\u3092\u63a8\u9032\u3057\u3066\u3044\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30dd\u30ea\u30b7\u30fc\u306f\u3053\u308c\u3092\u9632\u3050\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u88dc\u5b8c\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n\n<h2>\u30b3\u30b9\u30c8\u3001\u52aa\u529b\u3001\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\uff1a\u51b7\u9759\u306a\u6bd4\u8f03<\/h2>\n\n<p>\u30b5\u30fc\u30d0\u30fc\u306e\u30ec\u30f3\u30bf\u30eb\u6599\u3001IP\u30b3\u30b9\u30c8\u3001\u30a2\u30c3\u30d7\u30bf\u30a4\u30e0\u3001\u79c1\u306e\u52b4\u50cd\u6642\u9593\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002 <strong>\u6b3a\u779e\u7684<\/strong> \u597d\u610f\u7684\u3067\u3059\u3002\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u30fb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306f\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3001\u53ef\u7528\u6027\u3001\u30b5\u30dd\u30fc\u30c8\u304b\u3089\u89e3\u653e\u3055\u308c\u308b\u304c\u3001\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3054\u3068\u306b\u8cbb\u7528\u304c\u304b\u304b\u308b\u3002\u30bb\u30eb\u30d5\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306f\u6700\u5927\u9650\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u304c\u53ef\u80fd\u3060\u304c\u3001\u5e38\u6642\u76e3\u8996\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u5fc5\u8981\u3060\u3002DNS\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306e\u826f\u3055\u3001\u30af\u30ea\u30fc\u30f3\u306a\u767a\u9001\u3001\u614e\u91cd\u306a\u30d0\u30eb\u30af\u30e1\u30fc\u30eb\u6226\u7565\u304c\u30c8\u30e9\u30d6\u30eb\u3092\u9632\u3050\u3002\u4ee5\u4e0b\u306e\u8868\u306f\u7c21\u5358\u306a\u6982\u8981\u3067\u3001\u610f\u601d\u6c7a\u5b9a\u306e\u88dc\u52a9\u3068\u3057\u3066\u4f7f\u3063\u3066\u3044\u308b\u3002<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u57fa\u6e96<\/th>\n      <th>\u81ea\u793e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc<\/th>\n      <th>\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30ebE\u30e1\u30fc\u30eb\u30db\u30b9\u30c6\u30a3\u30f3\u30b0<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb<\/td>\n      <td>\u975e\u5e38\u306b\u9ad8\u3044\uff08\u3059\u3079\u3066 <strong>\u8a2d\u5b9a<\/strong> \u305d\u306e\u3082\u306e)<\/td>\n      <td>\u4e2d\uff5e\u9ad8\uff08\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u3088\u308b\uff09<\/td>\n    <\/tr>\n    <tr>\n      <td>\u6708\u984d\u8cbb\u7528<\/td>\n      <td>\u30b5\u30fc\u30d0\u30fc 10\uff5e40\u30e6\u30fc\u30ed\uff0b\u6642\u9593<\/td>\n      <td>\u30dd\u30b9\u30c81\u500b\u306b\u3064\u304d2\uff5e8\u30e6\u30fc\u30ed<\/td>\n    <\/tr>\n    <tr>\n      <td>\u652f\u51fa<\/td>\n      <td>\u9ad8\u3044\uff08\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3001\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\uff09<\/td>\n      <td>\u4f4e\u3044\uff08\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u304c\u904b\u55b6\u3092\u5f15\u304d\u7d99\u3050\uff09<\/td>\n    <\/tr>\n    <tr>\n      <td>\u914d\u9054\u53ef\u80fd\u6027<\/td>\n      <td>\u30ec\u30d4\u30e5\u30c6\u30fc\u30b7\u30e7\u30f3\u3068DNS\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306b\u4f9d\u5b58<\/td>\n      <td>\u307b\u3068\u3093\u3069\u304c\u975e\u5e38\u306b\u826f\u3044\u3002<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30b5\u30dd\u30fc\u30c8<\/td>\n      <td>\u81ea\u5206\u304b\u3001\u5730\u57df\u304b<\/td>\n      <td>\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u3088\u308b1\/2\u30ec\u30d9\u30eb\u306e\u30b5\u30dd\u30fc\u30c8<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0<\/td>\n      <td>\u67d4\u8edf\u3060\u304c\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306b\u7e1b\u3089\u308c\u308b<\/td>\n      <td>\u95a2\u7a0e\u3092\u5909\u3048\u308b\u3060\u3051\u3067<\/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\/09\/mailserverhosting_nachtszene_7382.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u8650\u5f85\u51e6\u7406\u3068\u30dd\u30b9\u30c8\u30de\u30b9\u30bf\u30fc\u30d7\u30ed\u30bb\u30b9<\/h2>\n\n<p>\u79c1\u306f\u6e05\u6f54\u3055\u3092\u78ba\u7acb\u3059\u308b <strong>\u8650\u5f85<\/strong>-\u3092\u51e6\u7406\u3059\u308b\uff1aabuse@\u304a\u3088\u3073postmaster@\u30a2\u30c9\u30ec\u30b9\u306e\u904b\u7528\u3001\u82e6\u60c5\u3078\u306e\u8fc5\u901f\u306a\u5bfe\u5fdc\u3001\u5927\u624bISP\u304b\u3089\u306e\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u30eb\u30fc\u30d7\uff08FBL\uff09\u3002\u7591\u308f\u3057\u3044\u30ed\u30b0\u30a4\u30f3\u8a66\u884c\u3084\u975e\u5b9a\u578b\u7684\u306a\u9001\u4fe1\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u4fb5\u5bb3\u3055\u308c\u305f\u30a2\u30ab\u30a6\u30f3\u30c8\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306f\u76f4\u3061\u306b\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u306e\u5909\u66f4\u3092\u5f37\u5236\u3057\u3001\u30c7\u30d0\u30a4\u30b9\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u4e0d\u6b63\u5229\u7528\u3092\u304d\u3081\u7d30\u304b\u304f\u8ffd\u8de1\u3067\u304d\u308b\u3088\u3046\u3001\u95a2\u9023\u3059\u308b\u30e6\u30fc\u30b6\u30fcID\u3067\u72af\u7f6a\u3092\u8a18\u9332\u3057\u3066\u3044\u307e\u3059\u3002SASL\u30e6\u30fc\u30b6\u30fc\u3054\u3068\u3001IP\u3054\u3068\u3001\u53d7\u4fe1\u8005\u3054\u3068\u306e\u30ec\u30fc\u30c8\u5236\u9650\u306b\u3088\u308a\u3001\u5408\u6cd5\u7684\u306a\u5229\u7528\u3092\u53b3\u3057\u304f\u5236\u9650\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u5927\u91cf\u767a\u751f\u3092\u9632\u6b62\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\/2025\/09\/mailserver_workspace_hosting_3027.png\" alt=\"\" width=\"1536\" height=\"1024\" \/>\n<\/figure>\n\n\n<h2>\u3088\u304f\u3042\u308b\u904e\u3061\u3068\u305d\u306e\u907f\u3051\u65b9<\/h2>\n\n<p>\u30c0\u30a4\u30ca\u30df\u30c3\u30afIP\u306f\u4f7f\u308f\u306a\u3044\u3002 <strong>\u8a55\u5224<\/strong> \u3068\u914d\u4fe1\u53ef\u80fd\u6027\u3002PTR\/rDNS\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u6b20\u843d\u3084\u4e0d\u9069\u5207\u306aHELO\u30db\u30b9\u30c8\u540d\u306f\u62d2\u5426\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u79c1\u306f\u30aa\u30fc\u30d7\u30f3\u30ea\u30ec\u30fc\u3092\u6c7a\u3057\u3066\u6709\u52b9\u306b\u305b\u305a\u3001\u9001\u4fe1\u306b\u306f\u5f37\u529b\u306a\u30b7\u30fc\u30af\u30ec\u30c3\u30c8\u3068\u7ba1\u7406\u30d1\u30cd\u30eb\u306eMFA\u306b\u3088\u308b\u8a8d\u8a3c\u304c\u5fc5\u8981\u3067\u3059\u3002\u6700\u65b0\u306e\u6697\u53f7\u3067TLS\u3092\u5b9f\u88c5\u3057\u3001\u53e4\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u7121\u52b9\u306b\u3057\u307e\u3059\u3002\u672c\u756a\u524d\u306b\u30ed\u30b0\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u69d8\u3005\u306a\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306b\u30c6\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u9001\u308a\u3001\u3059\u3079\u3066\u306eDNS\u30ec\u30b3\u30fc\u30c9\u3092\u30c0\u30d6\u30eb\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n\n<h2>\u793e\u5185\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u8ab0\u306b\u3068\u3063\u3066\u4fa1\u5024\u304c\u3042\u308a\u3001\u8ab0\u306b\u3068\u3063\u3066\u4fa1\u5024\u304c\u306a\u3044\u306e\u304b\uff1f<\/h2>\n\n<p>\u79c1\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u81ea\u793e\u3067\u306e\u624b\u8853\u3092\u8003\u3048\u3066\u3044\u308b\u3002 <strong>\u30c7\u30fc\u30bf\u4fdd\u8b77<\/strong> 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