{"id":4332,"date":"2020-07-28T10:01:17","date_gmt":"2020-07-28T01:01:17","guid":{"rendered":"https:\/\/blastmail.jp\/blog\/?p=4332"},"modified":"2025-10-16T14:22:09","modified_gmt":"2025-10-16T05:22:09","slug":"starttls-mailsecurity","status":"publish","type":"post","link":"https:\/\/blastmail.jp\/blog\/spam\/starttls-mailsecurity","title":{"rendered":"STARTTLS\u3068\u306f\uff1f\u5c0e\u5165\u306e\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u3092\u89e3\u8aac"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignnone size-full wp-image-4333\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2020\/07\/image1-5.png\" alt=\"\" width=\"1920\" height=\"1358\" \/><\/p>\n<p>\u30e1\u30eb\u30de\u30ac\u3092\u4f7f\u3063\u3066\u81ea\u793e\u30b5\u30fc\u30d3\u30b9\u306e\u96c6\u5ba2\u6d3b\u52d5\u3092\u3057\u3066\u3044\u308b\u65b9\u306f\u300c<strong>STAETTLS<\/strong>\uff08\u30b9\u30bf\u30fc\u30c8\u30c6\u30a3\u30fc\u30a8\u30eb\u30a8\u30b9\uff09\u300d\u3068\u3044\u3046\u8a00\u8449\u3092\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u306e\u6697\u53f7\u5316\u306b\u95a2\u308f\u308bSTARTTS\u306f\u3001\u60aa\u8cea\u306a\u7b2c\u4e09\u8005\u306e\u4ecb\u5165\u304b\u3089\u81ea\u793e\u306e\u4fe1\u7528\u3092\u5b88\u308b\u305f\u3081\u306e\u5927\u5207\u306a\u8981\u7d20\u3067\u3059\u3002<\/p>\n<p>\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u3084\u6539\u3056\u3093\u306e\u554f\u984c\u3092\u62b1\u3048\u308b\u30e1\u30fc\u30eb\u914d\u4fe1\u306f\u3001\u9001\u4fe1\u8005\u30fb\u53d7\u4fe1\u8005\u5171\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u95a2\u3059\u308b\u5bfe\u7b56\u3092\u3057\u306a\u3051\u308c\u3070\u3001<strong>\u60c5\u5831\u6f0f\u6d29\u306a\u3069\u306e\u4fe1\u7528\u554f\u984c\u306b\u767a\u5c55\u3057\u304b\u306d\u307e\u305b\u3093\u3002<\/strong><\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30e1\u30fc\u30eb\u3092\u60aa\u8cea\u306a\u7b2c\u4e09\u8005\u304b\u3089\u5b88\u308b\u6697\u53f7\u5316\u65b9\u5f0f\u3067\u3042\u308bSTARTTLS\u306e\u6982\u8981\u3084\u4ed5\u7d44\u307f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>STARTTLS\u3068\u306f<\/h2>\n<p>\u30e1\u30fc\u30eb\u306e\u9001\u53d7\u4fe1\u306b\u306f\u3001\u9001\u4fe1\u7528\u306eSMTP\u30b5\u30fc\u30d0\u30fc\u3068\u53d7\u4fe1\u7528\u306ePOP\u30b5\u30fc\u30d0\u30fc\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>STARTTLS\u306fSSL\u30fbTLS\u306e\u4ed5\u7d44\u307f\u3092\u4e0a\u8a18\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u9593\u306b\u5fdc\u7528\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u300cSSL\uff08Secure Sockets Layer\uff09\u300d\u3084\u300cTLS\uff08Transport Layers Security\uff09\u300d\u306f\u3001STARTTLS\u3068\u540c\u3058\u304f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u95a2\u3059\u308b\u7528\u8a9e\u306b\u306a\u308b\u306e\u3067\u3001\u6b21\u306e\u9805\u76ee\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>STARTTLS\u3092\u6d3b\u7528\u3057\u30c7\u30fc\u30bf\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30fc\u30eb\u306e\u6539\u3056\u3093\u306a\u3069\u3092\u9632\u6b62\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb\u9001\u53d7\u4fe1\u306e\u4ed5\u7d44\u307f\u306b\u3064\u3044\u3066\u306f<a href=\"https:\/\/blastmail.jp\/blog\/mail-delivery\/send-and-receive-mail\">\u3010\u521d\u5fc3\u8005\u5411\u3051\u3011\u30e1\u30fc\u30eb\u9001\u53d7\u4fe1\u306e\u4ed5\u7d44\u307f\u306b\u3064\u3044\u3066\u89e3\u8aac\uff01SMTP\u3001POP\u3001IMAP\u3001DNS\u3068\u306f\uff1f<\/a>\u3067\u3055\u3089\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>SSL\u30fbTLS\u3068\u306f<\/h2>\n<p>\u5148\u8ff0\u306e\u69d8\u306bSSL\u3068TLS\u306f\u30cd\u30c3\u30c8\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3059\u308b\u6280\u8853\u3067\u3001\u540d\u524d\u3053\u305d\u9055\u3044\u307e\u3059\u304c\u4e21\u8005\u306f\u540c\u3058\u6280\u8853\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30e1\u30fc\u30eb\u3060\u3051\u3067\u306a\u304f\u3001<strong>\u30a6\u30a7\u30d6\u3092\u4f7f\u3063\u305f\u901a\u4fe1\u5168\u822c\u3092\u6697\u53f7\u5316\u3057\u3066\u3044\u308b<\/strong>\u3053\u3068\u3082\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>SSL\u304c\u30d0\u30fc\u30b8\u30e7\u30f3\u30a2\u30c3\u30d7\u3057\u3066TLS\u3068\u306a\u3063\u305f\u306b\u3082\u95a2\u308f\u3089\u305a\u3001\u5143\u3005\u306eSSL\u3068\u3044\u3046\u547c\u3073\u65b9\u304c\u5b9a\u7740\u3057\u3066\u3057\u307e\u3063\u305f\u305f\u3081\u306b\u3001\u4e21\u65b9\u306e\u540d\u524d\u3067\u547c\u3070\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u610f\u5473\u306f\u540c\u3058\u3067\u3059\u3002<\/p>\n<h2>STARTTLS\u306a\u3069\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3092\u3057\u3066\u3044\u306a\u3044\u3068\u2026\u2026<\/h2>\n<p>STARTTLS\u3084SSL\u306a\u3069\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3092\u3057\u3066\u3044\u306a\u304b\u3063\u305f\u5834\u5408\u3001<strong>\u30c7\u30fc\u30bf\u306e\u6539\u3056\u3093\u3084\u500b\u4eba\u60c5\u5831\u306e\u6d41\u51fa<\/strong>\u306a\u3069\u306b\u767a\u5c55\u3059\u308b\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305f\u304f\u3055\u3093\u306e\u4e8b\u4f8b\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u65e5\u672c\u822a\u7a7a\uff08JAL\uff09\u304c\u793e\u7528\u306e\u30e1\u30fc\u30eb\u3092\u7b2c\u4e09\u8005\u306b\u4ecb\u5165\u3055\u308c\u308b\u300c<strong>\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb<\/strong>\u300d\u306e\u88ab\u5bb3\u306b\u906d\u3044\u30013\u5104\u5186\u4ee5\u4e0a\u3082\u306e\u304a\u91d1\u3092\u9a19\u3057\u53d6\u3089\u308c\u305f\u4e8b\u4ef6\u306f\u8a18\u61b6\u306b\u65b0\u3057\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u4f1a\u793e\u306e\u4fe1\u7528\u3092\u5b88\u308b\u305f\u3081\u306b\u3082\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306f\u78ba\u5b9f\u306b\u884c\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>STARTTLS\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/h2>\n<p>\u3053\u3053\u304b\u3089\u306fSTARTTLS\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h3>\u5c02\u7528\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u7528\u610f\u3057\u306a\u304f\u3066\u826f\u3044<\/h3>\n<p>STARTTLS\u306f\u3001<strong>\u5c02\u7528\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u4f7f\u308f\u305a\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u304c\u3067\u304d\u308b<\/strong>\u65b9\u5f0f\u3067\u3059\u3002<\/p>\n<p>\u7279\u5b9a\u306ePC\u3084\u30b9\u30de\u30db\u306a\u3069\u3092\u7279\u5b9a\u3059\u308b\u300cIP\u30a2\u30c9\u30ec\u30b9\u300d\u306f\u30a6\u30a7\u30d6\u4e0a\u306e\u4f4f\u6240\u306b\u55a9\u3048\u3089\u308c\u307e\u3059\u304c\u3001<strong>\u30dd\u30fc\u30c8\u756a\u53f7\u306f\u3001\u90e8\u5c4b\u756a\u53f7\u3068\u3044\u3048\u308b\u5f79\u5272<\/strong>\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>PC\u3084\u30b9\u30de\u30db\u306b\u9001\u3089\u308c\u3066\u304d\u305f\u30c7\u30fc\u30bf\u3092\u3001\u6a5f\u5668\u5185\u306e\u3069\u306e\u30b7\u30b9\u30c6\u30e0\u306b\u5c4a\u3051\u308c\u3070\u826f\u3044\u306e\u304b\u3092\u5224\u5225\u3057\u3066\u3044\u308b\u306e\u304c\u30dd\u30fc\u30c8\u756a\u53f7\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3063\u3066\u3042\u306a\u305f\u306e\u30b9\u30de\u30db\u306b\u30e1\u30fc\u30eb\u306e\u30c7\u30fc\u30bf\u304c\u9001\u3089\u308c\u3066\u304d\u305f\u3068\u3057\u307e\u3057\u3087\u3046\u3002<br 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