{"id":4332,"date":"2020-07-28T10:01:17","date_gmt":"2020-07-28T01:01:17","guid":{"rendered":"https:\/\/blastmail.jp\/blog\/?p=4332"},"modified":"2026-08-04T11:47:21","modified_gmt":"2026-08-04T02:47:21","slug":"starttls-mailsecurity","status":"publish","type":"post","link":"https:\/\/blastmail.jp\/blog\/spam\/starttls-mailsecurity","title":{"rendered":"STARTTLS\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u30fbSSL\/TLS\u3068\u306e\u9055\u3044\u30fb\u30e1\u30ea\u30c3\u30c8\u307e\u3067\u308f\u304b\u308a\u3084\u3059\u304f\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><strong>STARTTLS\u306f\u3001\u30e1\u30fc\u30eb\u3092\u9001\u308b\u3068\u304d\u306e\u901a\u4fe1\u3092\u3001\u9014\u4e2d\u304b\u3089\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u3048\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/strong>\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u306b\u306f\u300cSMTP\u300d\u3068\u3044\u3046\u901a\u4fe1\u306e\u6c7a\u307e\u308a\u3054\u3068\u304c\u4f7f\u308f\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u307e\u307e\u3067\u306f\u5185\u5bb9\u304c\u6697\u53f7\u5316\u3055\u308c\u305a\u3001\u914d\u9054\u306e\u9014\u4e2d\u3067\u7b2c\u4e09\u8005\u306b\u306e\u305e\u304d\u898b\u3089\u308c\u305f\u308a\u66f8\u304d\u63db\u3048\u3089\u308c\u305f\u308a\u3059\u308b\u304a\u305d\u308c\u304c\u3042\u308a\u307e\u3059\u3002STARTTLS\u306f\u3053\u306e\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3057\u3001\u508d\u53d7\u306e\u30ea\u30b9\u30af\u3092\u4e0b\u3052\u307e\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001STARTTLS\u304c\u4f55\u3092\u3059\u308b\u4ed5\u7d44\u307f\u306a\u306e\u304b\u3092\u3001\u5c02\u9580\u7528\u8a9e\u3092\u304b\u307f\u304f\u3060\u304d\u306a\u304c\u3089\u89e3\u8aac\u3057\u307e\u3059\u3002\u4ed5\u7d44\u307f\u3084\u30dd\u30fc\u30c8\u756a\u53f7\u3001SSL\/TLS\u30fbSMTPS\u3068\u306e\u9055\u3044\u3001\u30e1\u30ea\u30c3\u30c8\u3068\u9650\u754c\u3001\u8a2d\u5b9a\u30fb\u78ba\u8a8d\u65b9\u6cd5\u307e\u3067\u9806\u306b\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/blastmail.jp\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2023\/01\/bm_banner_big_mailsystem_1200x628.png\" alt=\"blastmail\u306e\u30d0\u30ca\u30fc\" width=\"1200\" height=\"629\" class=\"alignnone wp-image-19829 size-full\" \/><\/a><\/p>\n<h2>STARTTLS\u3068\u306f<\/h2>\n<p>STARTTLS\uff08\u30b9\u30bf\u30fc\u30c8\u30c6\u30a3\u30fc\u30a8\u30eb\u30a8\u30b9\uff09\u3068\u306f\u3001<strong>\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u901a\u4fe1\u3092\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\u3078\u9014\u4e2d\u304b\u3089\u5207\u308a\u66ff\u3048\u308b<\/strong>\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002\u540d\u524d\u306f\u300cSTART\u300d\u3068\u300cTLS\u300d\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u3082\u306e\u3067\u3001\u901a\u4fe1\u3092\u59cb\u3081\u305f\u3042\u3068\u306bTLS\uff08\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3059\u308b\u6280\u8853\uff09\u3078\u79fb\u884c\u3059\u308b\u3001\u3068\u3044\u3046\u52d5\u4f5c\u3092\u305d\u306e\u307e\u307e\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u524d\u63d0\u3068\u306a\u308b\u8a00\u8449\u3092\u6574\u7406\u3057\u307e\u3059\u3002\u30e1\u30fc\u30eb\u3092\u9001\u308b\u3068\u304d\u306b\u306f<strong>SMTP<\/strong>\u3068\u3044\u3046\u901a\u4fe1\u306e\u6c7a\u307e\u308a\u3054\u3068\uff08\u30d7\u30ed\u30c8\u30b3\u30eb\uff09\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002\u6a19\u6e96\u306eSMTP\u3067\u306f\u3001\u3084\u308a\u53d6\u308a\u304c<strong>\u5e73\u6587<\/strong>\u3001\u3064\u307e\u308a\u6697\u53f7\u5316\u3055\u308c\u305a\u306b\u305d\u306e\u307e\u307e\u8aad\u3081\u308b\u72b6\u614b\u3067\u9001\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u5e73\u6587\u306e\u901a\u4fe1\u3092\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\u306b\u5207\u308a\u66ff\u3048\u308b\u306e\u304cSTARTTLS\u306e\u5f79\u5272\u3067\u3059\u3002<\/p>\n<p>\u30a4\u30e1\u30fc\u30b8\u3068\u3057\u3066\u306f\u3001\u96fb\u8a71\u3067\u666e\u901a\u306b\u8a71\u3057\u59cb\u3081\u305f\u3042\u3068\u306b\u300c\u3053\u3053\u304b\u3089\u5185\u5bc6\u306b\u8a71\u3057\u307e\u3057\u3087\u3046\u300d\u3068\u5408\u56f3\u3057\u3001\u305d\u308c\u4ee5\u964d\u3092\u7b2c\u4e09\u8005\u306b\u306f\u610f\u5473\u306e\u5206\u304b\u3089\u306a\u3044\u6697\u53f7\u3067\u3084\u308a\u53d6\u308a\u3059\u308b\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\u6700\u521d\u306f\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u3067\u59cb\u307e\u308a\u3001\u9014\u4e2d\u304b\u3089\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u308f\u308b\u3001\u3068\u3044\u3046\u70b9\u304cSTARTTLS\u306e\u7279\u5fb4\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u30e1\u30fc\u30eb\u306f\u3001\u306f\u304c\u304d\u306e\u3088\u3046\u306b\u914d\u9054\u306e\u9014\u4e2d\u3067\u5185\u5bb9\u3092\u8aad\u307e\u308c\u308b\u304a\u305d\u308c\u304c\u3042\u308a\u307e\u3059\u3002STARTTLS\u306f\u3053\u306e\u7d4c\u8def\uff08\u30e1\u30fc\u30eb\u304c\u901a\u308b\u9053\u3059\u3058\uff09\u3092\u6697\u53f7\u5316\u3057\u3066\u3001\u76d7\u307f\u898b\u3084\u66f8\u304d\u63db\u3048\u3092\u9632\u304e\u3084\u3059\u304f\u3057\u307e\u3059\u3002<\/p>\n<h2>STARTTLS\u304c\u5fc5\u8981\u306a\u7406\u7531<\/h2>\n<p>\u305d\u306e\u307e\u307e\u306eSMTP\u306f\u5e73\u6587\u3067\u901a\u4fe1\u3055\u308c\u308b\u305f\u3081\u3001\u6697\u53f7\u5316\u3057\u306a\u3044\u307e\u307e\u3067\u306f\u901a\u4fe1\u306e\u5b89\u5168\u6027\u306b\u4e0d\u5b89\u304c\u6b8b\u308a\u307e\u3059\u3002STARTTLS\u304c\u6c42\u3081\u3089\u308c\u308b\u7406\u7531\u30922\u3064\u306e\u89b3\u70b9\u3067\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u76d7\u8074\u30fb\u6539\u3056\u3093\u306e\u30ea\u30b9\u30af<\/h3>\n<p>\u6697\u53f7\u5316\u3057\u3066\u3044\u306a\u3044\u30e1\u30fc\u30eb\u306f\u3001\u9001\u4fe1\u5143\u304b\u3089\u53d7\u4fe1\u5148\u3078\u5c4a\u304f\u307e\u3067\u306e\u7d4c\u8def\u306e\u9014\u4e2d\u3067\u3001\u5185\u5bb9\u3092\u7b2c\u4e09\u8005\u306b\u8aad\u307f\u53d6\u3089\u308c\u308b\u304a\u305d\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u53d6\u5f15\u60c5\u5831\u3084\u500b\u4eba\u60c5\u5831\u3092\u542b\u3080\u30e1\u30fc\u30eb\u304c\u8aad\u307f\u53d6\u3089\u308c\u308c\u3070\u3001<strong>\u60c5\u5831\u6f0f\u6d29\u3084\u4fe1\u7528\u306e\u4f4e\u4e0b<\/strong>\u306b\u3064\u306a\u304c\u308a\u304b\u306d\u307e\u305b\u3093\u3002STARTTLS\u3067\u7d4c\u8def\u3092\u6697\u53f7\u5316\u3059\u308b\u3053\u3068\u306f\u3001\u3053\u3046\u3057\u305f\u30ea\u30b9\u30af\u3092\u4e0b\u3052\u308b\u57fa\u672c\u7684\u306a\u5bfe\u7b56\u3067\u3059\u3002<\/p>\n<h3>Gmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3067\u306e\u5fc5\u9808\u5316<\/h3>\n<p>\u7d4c\u8def\u306e\u6697\u53f7\u5316\u306f\u3001\u3044\u307e\u3084\u4efb\u610f\u306e\u5bfe\u7b56\u3067\u306f\u306a\u304f\u306a\u308a\u3064\u3064\u3042\u308a\u307e\u3059\u3002Google\u306f2024\u5e742\u6708\u4ee5\u964d\u3001Gmail\u5b9b\u3066\u306b\u30e1\u30fc\u30eb\u3092\u9001\u308b\u3059\u3079\u3066\u306e\u9001\u4fe1\u8005\u306b\u5bfe\u3057\u3001<a href=\"https:\/\/support.google.com\/a\/answer\/81126?hl=ja\" target=\"_blank\" rel=\"noopener\">\u30e1\u30fc\u30eb\u9001\u4fe1\u8005\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3<\/a>\u306e\u306a\u304b\u3067TLS\u63a5\u7d9a\uff08\uff1d\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\uff09\u306e\u4f7f\u7528\u3092\u6c42\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306eTLS\u63a5\u7d9a\u306f\u3001SMTP\u306bSTARTTLS\u306e\u6a5f\u80fd\u3092\u52a0\u3048\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3055\u308c\u307e\u3059\u3002\u8981\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u3001\u30e1\u30fc\u30eb\u304c\u62d2\u5426\u3055\u308c\u305f\u308a\u8ff7\u60d1\u30e1\u30fc\u30eb\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306e\u5168\u4f53\u50cf\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n  <div class=\"blogcard\">\n  <a href=\"\/blog\/spam\/gmail-guideline-202402\">\n   <div class=\"blogcard_thumbnail\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2023\/11\/Gmail_guide.png\" alt=\"\u30102026\u5e74\u7248\u3011Gmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u5b8c\u5168\u30ac\u30a4\u30c9\uff5cSPF\u30fbDKIM\u30fbDMARC\u30685,000\u901a\u30eb\u30fc\u30eb\u3092\u89e3\u8aac\" width=\"90\" height=\"47\" \/><\/div>\n   <div class=\"blogcard_content\">\n    <div class=\"blogcard_title\">\u30102026\u5e74\u7248\u3011Gmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u5b8c\u5168\u30ac\u30a4\u30c9\uff5cSPF\u30fbDKIM\u30fbDMARC\u30685,000\u901a\u30eb\u30fc\u30eb\u3092\u89e3\u8aac<\/div>\n    <div class=\"blogcard_excerpt\">Gmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3068\u306f\u3001\u300cGmail\u306b\u30e1\u30fc\u30eb\u3092\u5c4a\u3051\u305f\u3044\u306a\u3089\u3001\u9001\u4fe1\u5074\u306f\u3053\u306e\u30eb\u30fc\u30eb\u3092\u5b88\u3063\u3066\u304f\u3060\u3055\u3044\u300d\u3068Google\u304c\u5b9a\u3081\u305f\u8981\u4ef6\u306e\u3053\u3068\u3067\u3059\u3002\u6b63\u5f0f\u540d\u2026<\/div>\n   <\/div>\n   <div class=\"clear\"><\/div>\n  <\/a>\n  <\/div>\n<h2>STARTTLS\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>STARTTLS\u306f\u3001\u5e73\u6587\u3067\u59cb\u307e\u3063\u305f\u901a\u4fe1\u306e\u9014\u4e2d\u3067\u6697\u53f7\u5316\u3078\u5207\u308a\u66ff\u3048\u307e\u3059\u3002<\/p>\n<h3>\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u308f\u308b\u6d41\u308c<\/h3>\n<p>STARTTLS\u3067\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u6d41\u308c\u3067\u5e73\u6587\u306e\u901a\u4fe1\u304b\u3089\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\u3078\u79fb\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li>\u30e1\u30fc\u30eb\u3092\u9001\u308b\u5074\u304c\u3001\u76f8\u624b\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u63a5\u7d9a\u3059\u308b<\/li>\n<li>\u76f8\u624b\u304cSTARTTLS\uff08\u6697\u53f7\u5316\u3078\u306e\u5207\u308a\u66ff\u3048\uff09\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<li>\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u3001\u6697\u53f7\u5316\u3092\u59cb\u3081\u308b\u5408\u56f3\u3092\u9001\u308b<\/li>\n<li>\u4e21\u8005\u3067\u6697\u53f7\u5316\u306e\u6e96\u5099\u3092\u6574\u3048\u3001\u4ee5\u964d\u306e\u3084\u308a\u53d6\u308a\u3092\u6697\u53f7\u5316\u3059\u308b<\/li>\n<\/ul>\n<\/div>\n<p>\u3053\u306e\u300c\u6697\u53f7\u5316\u3092\u59cb\u3081\u308b\u5408\u56f3\u300d\u304c\u3001\u305d\u306e\u540d\u306e\u901a\u308a <span style=\"background: #f2f2f2; padding: .1em .4em; border-radius: 3px; font-family: monospace; font-size: .95em;\">STARTTLS<\/span> \u3068\u3044\u3046\u30b3\u30de\u30f3\u30c9\u3067\u3059\u3002\u3053\u308c\u3092\u9001\u3063\u305f\u3042\u3068\u3001\u53cc\u65b9\u3067\u6697\u53f7\u5316\u306e\u8a2d\u5b9a\uff08TLS\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\uff1d\u6697\u53f7\u5316\u901a\u4fe1\u3092\u59cb\u3081\u308b\u305f\u3081\u306e\u624b\u7d9a\u304d\uff09\u3092\u884c\u3044\u3001\u305d\u3053\u304b\u3089\u5148\u304c\u6697\u53f7\u5316\u3055\u308c\u307e\u3059\u3002<strong>\u6700\u521d\u306e\u3084\u308a\u53d6\u308a\u306f\u5e73\u6587\u3067\u3001\u305d\u306e\u3042\u3068\u306b\u6697\u53f7\u5316\u304c\u59cb\u307e\u308b<\/strong>\u3068\u3044\u3046\u9806\u5e8f\u304c\u3001STARTTLS\u306e\u52d5\u4f5c\u306e\u8981\u70b9\u3067\u3059\u3002<\/p>\n<h3>STARTTLS\u3067\u4f7f\u308f\u308c\u308b\u30dd\u30fc\u30c8\u756a\u53f7<\/h3>\n<p>\u30dd\u30fc\u30c8\u3068\u306f\u3001\u901a\u4fe1\u306e\u51fa\u5165\u308a\u53e3\u306e\u3053\u3068\u3067\u3059\u3002\u4f4f\u6240\uff08IP\u30a2\u30c9\u30ec\u30b9\uff09\u306b\u5bfe\u3059\u308b\u300c\u90e8\u5c4b\u756a\u53f7\u300d\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3001\u5c4a\u3044\u305f\u30c7\u30fc\u30bf\u3092\u6a5f\u5668\u5185\u306e\u3069\u306e\u30b7\u30b9\u30c6\u30e0\u306b\u6e21\u3059\u304b\u3092\u898b\u5206\u3051\u308b\u5f79\u5272\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>STARTTLS\u306f\u3001\u6697\u53f7\u5316\u306e\u305f\u3081\u306e<strong>\u5c02\u7528\u306e\u51fa\u5165\u308a\u53e3\u3092\u65b0\u3057\u304f\u7528\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093<\/strong>\u3002\u30e1\u30fc\u30eb\u9001\u4fe1\u3067\u5f93\u6765\u304b\u3089\u4f7f\u308f\u308c\u3066\u304d\u305f<strong>25\u756a<\/strong>\u3084<strong>587\u756a<\/strong>\u3068\u3044\u3063\u305f\u30dd\u30fc\u30c8\u3092\u3001\u305d\u306e\u307e\u307e\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u3048\u3066\u4f7f\u3048\u307e\u3059\u3002\u3053\u306e\u300c\u65e2\u5b58\u306e\u30dd\u30fc\u30c8\u3092\u6d41\u7528\u3067\u304d\u308b\u300d\u70b9\u306f\u3001\u6b21\u306b\u8aac\u660e\u3059\u308bSMTPS\u3068\u306e\u5927\u304d\u306a\u9055\u3044\u3067\u3059\u3002<\/p>\n<h2>SSL\/TLS\u30fbSMTPS\u3068\u306e\u9055\u3044<\/h2>\n<p>STARTTLS\u3092\u7406\u89e3\u3059\u308b\u3046\u3048\u3067\u95a2\u308f\u308a\u304c\u6df1\u3044\u306e\u304c\u3001SSL\/TLS\u3084SMTPS\u3068\u3044\u3046\u8a00\u8449\u3067\u3059\u3002\u305d\u308c\u305e\u308c\u3068\u306e\u95a2\u4fc2\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n<h3>SSL\u3068TLS\u306e\u95a2\u4fc2<\/h3>\n<p>SSL\uff08Secure Sockets Layer\uff09\u3068TLS\uff08Transport Layer Security\uff09\u306f\u3001\u3069\u3061\u3089\u3082\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3059\u308b\u305f\u3081\u306e\u6280\u8853\u3067\u3059\u3002TLS\u306fSSL\u306e\u5f8c\u7d99\u3068\u3057\u3066\u4f5c\u3089\u308c\u305f\u3082\u306e\u3067\u3001STARTTLS\u306f\u3053\u306eTLS\u3092\u4f7f\u3063\u3066\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001<strong>SSL\/TLS\u304c\u6697\u53f7\u5316\u306e\u65b9\u5f0f\u3001STARTTLS\u304c\u305d\u308c\u3092\u5e73\u6587\u306e\u901a\u4fe1\u306b\u9069\u7528\u3059\u308b\u305f\u3081\u306e\u624b\u9806<\/strong>\u3001\u3068\u3044\u3046\u95a2\u4fc2\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001SSL\u3084\u521d\u671f\u306eTLS\uff08TLS 1.0\uff0f1.1\uff09\u306f\u5b89\u5168\u6027\u306e\u554f\u984c\u304c\u6307\u6458\u3055\u308c\u3001\u73fe\u5728\u306f\u5229\u7528\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u5b89\u5168\u6027\u306e\u89b3\u70b9\u304b\u3089\u306f\u3001\u3088\u308a\u65b0\u3057\u3044TLS 1.2\u4ee5\u964d\u3067\u306e\u901a\u4fe1\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>STARTTLS\u3068SMTPS\uff08465\u756a\uff09\u306e\u9055\u3044<\/h3>\n<p>SMTPS\u3082\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u304c\u3001STARTTLS\u3068\u306f<strong>\u6697\u53f7\u5316\u3092\u59cb\u3081\u308b\u30bf\u30a4\u30df\u30f3\u30b0<\/strong>\u304c\u7570\u306a\u308a\u307e\u3059\u3002STARTTLS\u304c\u5e73\u6587\u3067\u59cb\u3081\u3066\u304b\u3089\u9014\u4e2d\u3067\u6697\u53f7\u5316\u3078\u5207\u308a\u66ff\u3048\u308b\u306e\u306b\u5bfe\u3057\u3001SMTPS\u306f\u63a5\u7d9a\u3057\u305f<strong>\u6700\u521d\u304b\u3089<\/strong>\u6697\u53f7\u5316\u3092\u884c\u3044\u3001\u305d\u306e\u305f\u3081\u306e\u5c02\u7528\u30dd\u30fc\u30c8\uff08465\u756a\uff09\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<div class=\"su-table su-table-alternate\">\n<table>\n<tbody>\n<tr>\n<th>\u9805\u76ee<\/th>\n<th>STARTTLS<\/th>\n<th>SMTPS\uff08SSL\/TLS\uff09<\/th>\n<\/tr>\n<tr>\n<td>\u6697\u53f7\u5316\u306e\u958b\u59cb<\/td>\n<td>\u63a5\u7d9a\u5f8c\u3001\u9014\u4e2d\u304b\u3089\u5207\u308a\u66ff\u3048\u308b<\/td>\n<td>\u63a5\u7d9a\u3057\u305f\u6700\u521d\u304b\u3089\u6697\u53f7\u5316<\/td>\n<\/tr>\n<tr>\n<td>\u4e3b\u306a\u30dd\u30fc\u30c8<\/td>\n<td>25\u756a\u30fb587\u756a\uff08\u65e2\u5b58\u306e\u30dd\u30fc\u30c8\u3092\u5229\u7528\uff09<\/td>\n<td>465\u756a\uff08\u5c02\u7528\u30dd\u30fc\u30c8\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u59cb\u3081\u65b9<\/td>\n<td>\u5e73\u6587\u3067\u59cb\u3081\u3001\u6697\u53f7\u5316\u3078\u5207\u308a\u66ff\u3048\u308b<\/td>\n<td>\u6700\u521d\u304b\u3089\u6697\u53f7\u5316\u3055\u308c\u305f\u72b6\u614b\u3067\u63a5\u7d9a\u3059\u308b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>STARTTLS\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u9650\u754c<\/h2>\n<p>STARTTLS\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u9650\u754c\u306f\u3001\u3044\u305a\u308c\u3082\u300c\u76f8\u624b\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u6697\u53f7\u5316\u3057\u3001\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u5e73\u6587\u3067\u9001\u308b\u300d\u3068\u3044\u3046\u6027\u8cea\u304b\u3089\u751f\u307e\u308c\u307e\u3059\u3002\u4e21\u8005\u306f\u540c\u3058\u6027\u8cea\u306e\u8868\u3068\u88cf\u306e\u95a2\u4fc2\u306b\u3042\u308b\u305f\u3081\u3001\u3042\u308f\u305b\u3066\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30ea\u30c3\u30c8\uff1a\u5c0e\u5165\u3057\u3084\u3059\u304f\u3001\u76f8\u624b\u3092\u9078\u3070\u306a\u3044<\/h3>\n<p>STARTTLS\u306f\u3001\u6697\u53f7\u5316\u306e\u305f\u3081\u306e\u5c02\u7528\u30dd\u30fc\u30c8\u3092\u65b0\u3057\u304f\u7528\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u524d\u8ff0\u306e\u3068\u304a\u308a25\u756a\u3084587\u756a\u3068\u3044\u3063\u305f<strong>\u65e2\u5b58\u306e\u30dd\u30fc\u30c8\u3092\u305d\u306e\u307e\u307e\u4f7f\u3063\u3066<\/strong>\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u3048\u3089\u308c\u308b\u305f\u3081\u3001\u8a2d\u5b9a\u3084\u74b0\u5883\u5909\u66f4\u306e\u8ca0\u62c5\u304c\u5c0f\u3055\u304f\u6e08\u307f\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u76f8\u624b\u304c\u6697\u53f7\u5316\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u6697\u53f7\u5316\u3057\u3001\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u5e73\u6587\u3067\u9001\u308a\u307e\u3059\u3002\u3053\u306e\u67d4\u8edf\u3055\u306e\u304a\u304b\u3052\u3067\u3001<strong>\u76f8\u624b\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u6697\u53f7\u5316\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3067\u3082\u3001\u30e1\u30fc\u30eb\u81ea\u4f53\u306f\u5c4a\u304d\u307e\u3059<\/strong>\u3002\u3055\u307e\u3056\u307e\u306a\u76f8\u624b\u3068\u3084\u308a\u53d6\u308a\u3059\u308b\u5b9f\u969b\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u3067\u3001\u901a\u4fe1\u3092\u6b62\u3081\u305a\u306b\u6697\u53f7\u5316\u3092\u8a66\u307f\u3089\u308c\u308b\u70b9\u306f\u5b9f\u7528\u7684\u3067\u3059\u3002<\/p>\n<h3>\u9650\u754c\uff1a\u6697\u53f7\u5316\u304c\u4fdd\u8a3c\u3055\u308c\u308b\u308f\u3051\u3067\u306f\u306a\u3044<\/h3>\n<p>\u300c\u76f8\u624b\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u304f\u3066\u3082\u9001\u308c\u308b\u300d\u3068\u3044\u3046\u67d4\u8edf\u3055\u306f\u3001\u88cf\u3092\u8fd4\u3059\u3068<strong>\u76f8\u624b\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u5e73\u6587\u306e\u307e\u307e\u9001\u3089\u308c\u308b<\/strong>\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u9001\u308b\u5074\u304c\u6697\u53f7\u5316\u3092\u671b\u3093\u3067\u3044\u3066\u3082\u3001\u76f8\u624b\u6b21\u7b2c\u3067\u5e73\u6587\u306b\u306a\u308a\u5f97\u308b\u70b9\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u901a\u4fe1\u306e\u6700\u521d\u306e\u90e8\u5206\u304c\u5e73\u6587\u3067\u3042\u308b\u3053\u3068\u3092\u60aa\u7528\u3057\u305f\u653b\u6483\u3082\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u653b\u6483\u8005\u304c\u901a\u4fe1\u306e\u9014\u4e2d\u306b\u5272\u308a\u8fbc\u307f\u3001\u6697\u53f7\u5316\u3078\u306e\u5207\u308a\u66ff\u3048\u3092\u59a8\u3052\u3066\u3001\u5e73\u6587\u306e\u307e\u307e\u901a\u4fe1\u3055\u305b\u3066\u3057\u307e\u3046\u624b\u53e3\u3067\u3059\u3002\u3053\u308c\u306f<strong>\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u653b\u6483<\/strong>\uff08\u6697\u53f7\u5316\u306e\u30ec\u30d9\u30eb\u3092\u7121\u7406\u3084\u308a\u4e0b\u3052\u308b\u653b\u6483\uff09\u3068\u547c\u3070\u308c\u3001STARTTLS\u5358\u4f53\u3067\u306f\u3053\u3046\u3057\u305f\u653b\u6483\u3092\u5b8c\u5168\u306b\u306f\u9632\u3052\u307e\u305b\u3093\u3002<\/p>\n<h2>STARTTLS\u306e\u9650\u754c\u3092\u88dc\u3046\u6280\u8853<\/h2>\n<p>STARTTLS\u306e\u300c\u76f8\u624b\u6b21\u7b2c\u3067\u5e73\u6587\u306b\u306a\u308b\u300d\u3068\u3044\u3046\u5f31\u70b9\u3092\u88dc\u3044\u3001\u6697\u53f7\u5316\u3092\u78ba\u5b9f\u306b\u3059\u308b\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3082\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a2\u3064\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>MTA-STS\u3067\u6697\u53f7\u5316\u3092\u5fc5\u9808\u306b\u3059\u308b<\/h3>\n<p><strong>MTA-STS<\/strong>\u306f\u3001\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u308b\u5074\u304c\u300c\u3053\u306e\u30c9\u30e1\u30a4\u30f3\u5b9b\u3066\u306f\u6697\u53f7\u5316\u3092\u5fc5\u9808\u306b\u3059\u308b\u300d\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3092\u516c\u958b\u3057\u3066\u304a\u304f\u4ed5\u7d44\u307f\u3067\u3059\u3002\u9001\u308b\u5074\u306f\u3053\u306e\u30eb\u30fc\u30eb\u3092\u78ba\u8a8d\u3057\u3001\u6697\u53f7\u5316\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u9001\u4fe1\u3057\u306a\u3044\u3001\u3068\u3044\u3046\u52d5\u4f5c\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u610f\u56f3\u305b\u305a\u5e73\u6587\u3067\u9001\u3089\u308c\u3066\u3057\u307e\u3046\u30ea\u30b9\u30af\u3092\u4e0b\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<h3>DANE\u3067\u63a5\u7d9a\u5148\u306e\u6b63\u3057\u3055\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n<p><strong>DANE<\/strong>\u306f\u3001DNS\uff08\u30c9\u30e1\u30a4\u30f3\u540d\u3068\u30b5\u30fc\u30d0\u30fc\u3092\u7d50\u3073\u3064\u3051\u308b\u4ed5\u7d44\u307f\uff09\u3092\u5229\u7528\u3057\u3066\u3001\u6697\u53f7\u5316\u306b\u4f7f\u3046\u8a3c\u660e\u66f8\u304c\u6b63\u3057\u3044\u3082\u306e\u304b\u3092\u78ba\u8a8d\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u6280\u8853\u3067\u3059\u3002MTA-STS\u3068\u540c\u3058\u304f\u3001STARTTLS\u306e\u300c\u3067\u304d\u308c\u3070\u6697\u53f7\u5316\u3059\u308b\u300d\u3092\u300c\u6697\u53f7\u5316\u3067\u304d\u306a\u3051\u308c\u3070\u9001\u3089\u306a\u3044\u300d\u3078\u3068\u5f15\u304d\u4e0a\u3052\u308b\u5f79\u5272\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n<h2>STARTTLS\u306e\u8a2d\u5b9a\u30fb\u78ba\u8a8d\u65b9\u6cd5<\/h2>\n<p>\u3053\u3053\u3067\u306f\u30e1\u30fc\u30eb\u3092\u9001\u308b\u5074\uff08\u914d\u4fe1\u62c5\u5f53\u8005\uff09\u306e\u8996\u70b9\u3067\u3001STARTTLS\uff08TLS\u63a5\u7d9a\uff09\u304c\u4f7f\u3048\u308b\u72b6\u614b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3092\u6574\u7406\u3057\u307e\u3059\u3002\u78ba\u8a8d\u306e\u5bfe\u8c61\u306f\u81ea\u793e\u306e\u9001\u4fe1\u74b0\u5883\u3067\u3042\u308a\u3001\u53d7\u4fe1\u8005\u5074\u306e\u64cd\u4f5c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3>\u9001\u4fe1\u5074\u306e\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n<p>\u307e\u305a\u78ba\u8a8d\u3057\u305f\u3044\u306e\u306f\u3001\u81ea\u793e\u306e\u9001\u4fe1\u74b0\u5883\uff08\u914d\u4fe1\u30b5\u30fc\u30d0\u30fc\u3084\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\uff09\u3067STARTTLS\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3067\u3059\u3002\u5e02\u8ca9\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u6a19\u6e96\u3067\u6709\u52b9\u306a\u3053\u3068\u304c\u591a\u3044\u4e00\u65b9\u3001<strong>\u81ea\u793e\u3067\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3092\u69cb\u7bc9\u3057\u3066\u3044\u308b\u5834\u5408<\/strong>\u306f\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u3053\u3068\u3082\u3042\u308b\u305f\u3081\u3001\u9001\u4fe1\u6642\u306b\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\u304c\u4f7f\u308f\u308c\u308b\u8a2d\u5b9a\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u304c\u6697\u53f7\u5316\u3055\u308c\u3066\u5c4a\u3044\u305f\u304b\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n<p>\u5b9f\u969b\u306b\u9001\u3063\u305f\u30e1\u30fc\u30eb\u304c\u6697\u53f7\u5316\u3055\u308c\u3066\u5c4a\u3044\u305f\u304b\u306f\u3001\u53d7\u3051\u53d6\u3063\u305f\u30e1\u30fc\u30eb\u5074\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070Gmail\u3067\u306f\u3001\u6697\u53f7\u5316\u3055\u308c\u305a\u306b\u5c4a\u3044\u305f\u30e1\u30fc\u30eb\u306b\u9375\u306e\u8b66\u544a\u30a2\u30a4\u30b3\u30f3\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u53d7\u4fe1\u3057\u305f\u30e1\u30fc\u30eb\u306e\u8a73\u7d30\u60c5\u5831\u304b\u3089\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\u3067\u53d7\u4fe1\u3055\u308c\u305f\u304b\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u9001\u4fe1\u5074\u306eTLS\u8a2d\u5b9a\u306e\u5177\u4f53\u7684\u306a\u624b\u9806\u3084\u3001Gmail\u30fbOutlook\u3067\u306e\u78ba\u8a8d\u624b\u9806\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n  <div class=\"blogcard\">\n  <a href=\"\/blog\/mail-delivery\/tls-send\">\n   <div class=\"blogcard_thumbnail\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2024\/02\/tls-send-1.png\" alt=\"\u30e1\u30fc\u30eb\u9001\u4fe1\u306eTLS\u8a2d\u5b9a\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u304b\u3089Gmail\u30fbOutlook\u3067\u306e\u78ba\u8a8d\u65b9\u6cd5\u307e\u3067\u89e3\u8aac\" width=\"90\" height=\"51\" \/><\/div>\n   <div class=\"blogcard_content\">\n    <div class=\"blogcard_title\">\u30e1\u30fc\u30eb\u9001\u4fe1\u306eTLS\u8a2d\u5b9a\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u304b\u3089Gmail\u30fbOutlook\u3067\u306e\u78ba\u8a8d\u65b9\u6cd5\u307e\u3067\u89e3\u8aac<\/div>\n    <div class=\"blogcard_excerpt\">\u30d3\u30b8\u30cd\u30b9\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3068\u3057\u3066TLS\u8a2d\u5b9a\u304c\u5fc5\u9808\u3068\u8a00\u308f\u308c\u3066\u3082\u3001\u5177\u4f53\u7684\u306b\u4f55\u3092\u3059\u308c\u3070\u3088\u3044\u306e\u304b\u5206\u304b\u3089\u305a\u304a\u56f0\u308a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304b\u3002\u7279\u306b\u8fd1\u5e74\u306fGoog\u2026<\/div>\n   <\/div>\n   <div class=\"clear\"><\/div>\n  <\/a>\n  <\/div>\n<h2>\u30e1\u30fc\u30eb\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3059\u308b\u306a\u3089\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u6d3b\u7528\u3059\u308b<\/h2>\n<p>STARTTLS\u304c\u5bfe\u7b56\u3067\u304d\u308b\u306e\u306f\u76d7\u8074\u30fb\u6539\u3056\u3093\u3067\u3001\u5dee\u51fa\u4eba\u306e<strong>\u306a\u308a\u3059\u307e\u3057<\/strong>\uff08\u9001\u4fe1\u5143\u3092\u507d\u3063\u3066\u9001\u3089\u308c\u308b\u30e1\u30fc\u30eb\uff09\u306f\u9632\u3052\u307e\u305b\u3093\u3002\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u306b\u306f\u3001SPF\u30fbDKIM\u30fbDMARC\u3068\u3044\u3063\u305f\u5225\u306e\u4ed5\u7d44\u307f\uff08\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\uff09\u304c\u5fc5\u8981\u3067\u3059\u3002\u4ed5\u7d44\u307f\u3068\u8a2d\u5b9a\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n  <div class=\"blogcard\">\n  <a href=\"\/blog\/no-delivery\/identification\">\n   <div class=\"blogcard_thumbnail\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2025\/07\/WEBCAS\u306e\u30b3\u30d4\u30fc.png\" alt=\"\u3010\u30e1\u30fc\u30eb\u306e\u8eab\u5206\u8a3c\u3011SPF\u30fbDKIM\u30fbDMARC\u3067\u300c\u306a\u308a\u3059\u307e\u3057\u300d\u3092\u9632\u304e\u3001\u30e1\u30fc\u30eb\u3092\u78ba\u5b9f\u306b\u5c4a\u3051\u308b\u65b9\u6cd5\" width=\"90\" height=\"47\" \/><\/div>\n   <div class=\"blogcard_content\">\n    <div class=\"blogcard_title\">\u3010\u30e1\u30fc\u30eb\u306e\u8eab\u5206\u8a3c\u3011SPF\u30fbDKIM\u30fbDMARC\u3067\u300c\u306a\u308a\u3059\u307e\u3057\u300d\u3092\u9632\u304e\u3001\u30e1\u30fc\u30eb\u3092\u78ba\u5b9f\u306b\u5c4a\u3051\u308b\u65b9\u6cd5<\/div>\n    <div class=\"blogcard_excerpt\">\u300c\u8ff7\u60d1\u30e1\u30fc\u30eb\u3058\u3083\u306a\u3044\u306e\u306b\u3001\u306a\u305c\u304b\u30e1\u30fc\u30eb\u304c\u5c4a\u304b\u306a\u3044..\u3002\u300d \u300c\u304a\u5ba2\u69d8\u306b\u9001\u3063\u305f\u5927\u4e8b\u306a\u30e1\u30fc\u30eb\u304c\u3001\u8ff7\u60d1\u30e1\u30fc\u30eb\u30d5\u30a9\u30eb\u30c0\u306b\u5165\u3063\u3066\u3057\u307e\u3046..\u3002\u300d \u3053\u3093\u306a\u60a9\u307f\u3092\u2026<\/div>\n   <\/div>\n   <div class=\"clear\"><\/div>\n  <\/a>\n  <\/div>\n<p>\u6697\u53f7\u5316\u30fb\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u30fb\u5927\u91cf\u914d\u4fe1\u306e\u904b\u7528\u3092\u500b\u5225\u306b\u6574\u3048\u308b\u306e\u306f\u8ca0\u62c5\u304c\u5927\u304d\u3044\u305f\u3081\u3001\u3053\u308c\u3089\u306b\u6a19\u6e96\u3067\u5bfe\u5fdc\u3057\u305f\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/h3>\n<p>\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u5229\u7528\u3059\u308b\u3068\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3068\u914d\u4fe1\u696d\u52d9\u3092\u4e00\u3064\u306e\u57fa\u76e4\u3067\u307e\u3068\u3081\u3066\u52b9\u7387\u5316\u3067\u304d\u307e\u3059\u3002\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<div class=\"list04\">\n<ul>\n<li>\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\uff08TLS\uff0fSTARTTLS\uff09\u306b\u6a19\u6e96\u5bfe\u5fdc\u3057\u3001\u8a2d\u5b9a\u306e\u624b\u9593\u3092\u6291\u3048\u3089\u308c\u308b<\/li>\n<li>SPF\u30fbDKIM\u30fbDMARC\u306a\u3069\u306e\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u306b\u5bfe\u5fdc\u3057\u3084\u3059\u3044<\/li>\n<li>\u5927\u91cf\u306e\u30e1\u30fc\u30eb\u3067\u3082\u5c4a\u304d\u3084\u3059\u3044\u914d\u4fe1\u57fa\u76e4\u3092\u5229\u7528\u3067\u304d\u308b<\/li>\n<li>\u958b\u5c01\u7387\u3084\u30af\u30ea\u30c3\u30af\u7387\u306a\u3069\u306e\u52b9\u679c\u6e2c\u5b9a\u3067\u914d\u4fe1\u3092\u6539\u5584\u3067\u304d\u308b<\/li>\n<\/ul>\n<\/div>\n<p>\u6697\u53f7\u5316\u3084\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u306e\u8a2d\u5b9a\u3092\u500b\u5225\u306b\u69cb\u7bc9\u30fb\u7dad\u6301\u3059\u308b\u8ca0\u62c5\u3092\u6291\u3048\u3064\u3064\u3001\u30e1\u30fc\u30eb\u914d\u4fe1\u696d\u52d9\u305d\u306e\u3082\u306e\u306e\u52b9\u7387\u5316\u306b\u3082\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<h2>\u304a\u3059\u3059\u3081\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u300c\u30d6\u30e9\u30b9\u30c8\u30e1\u30fc\u30eb\u300d<\/h2>\n<p><a href=\"https:\/\/blastmail.jp\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2024\/07\/blastmail-top.jpg\" alt=\"\u30d6\u30e9\u30b9\u30c8\u30e1\u30fc\u30eb\u306e\u30ad\u30e3\u30c3\u30c1\u753b\u50cf\" width=\"1200\" height=\"630\" class=\"alignnone wp-image-15955 size-full\" \/><\/a><\/p>\n<p>\u30d6\u30e9\u30b9\u30c8\u30e1\u30fc\u30eb\uff08blastmail\uff09\u306f\u300115\u5e74\u9023\u7d9a\u3067\u5c0e\u5165\u793e\u6570\u30b7\u30a7\u30a2No.1\uff08\u203b\uff09\u3092\u7372\u5f97\u3057\u3066\u3044\u308b\u65e5\u672c\u6700\u5927\u7d1a\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u3059\u300227,000\u793e\u4ee5\u4e0a\u306e\u5c0e\u5165\u5b9f\u7e3e\u304c\u3042\u308a\u3001\u5c02\u9580\u77e5\u8b58\u304c\u306a\u304f\u3066\u3082\u76f4\u611f\u7684\u306b\u64cd\u4f5c\u3067\u304d\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u7ba1\u7406\u753b\u9762\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>TLS\uff08STARTTLS\uff09\u306b\u6a19\u6e96\u5bfe\u5fdc<\/strong>\uff1a\u30e1\u30fc\u30eb\u914d\u4fe1\u6642\u306e\u901a\u4fe1\u3092\u6697\u53f7\u5316\u3057\u3001\u7d4c\u8def\u4e0a\u306e\u76d7\u8074\u30fb\u6539\u3056\u3093\u306e\u30ea\u30b9\u30af\u3092\u6291\u3048\u307e\u3059<\/li>\n<li><strong>\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u3078\u306e\u5bfe\u5fdc<\/strong>\uff1aSPF\u30fbDKIM\u306b\u5bfe\u5fdc\u3057\u3001Gmail\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306b\u6cbf\u3063\u305f\u904b\u7528\u304c\u3067\u304d\u307e\u3059\uff08DKIM\u306fStandard\u30d7\u30e9\u30f3\u4ee5\u4e0a\uff09<\/li>\n<li><strong>\u52b9\u679c\u6e2c\u5b9a<\/strong>\uff1a\u958b\u5c01\u7387\u30fb\u30af\u30ea\u30c3\u30af\u7387\u30fb\u30a8\u30e9\u30fc\u30ab\u30a6\u30f3\u30c8\u3092\u78ba\u8a8d\u3067\u304d\u3001\u6b21\u306e\u65bd\u7b56\u306b\u6d3b\u304b\u305b\u307e\u3059<\/li>\n<li><strong>\u30d5\u30a3\u30eb\u30bf\u914d\u4fe1\uff08\u30bb\u30b0\u30e1\u30f3\u30c8\u914d\u4fe1\uff09<\/strong>\uff1a\u8aad\u8005\u306e\u5c5e\u6027\u3067\u30b0\u30eb\u30fc\u30d7\u3092\u4f5c\u308a\u3001\u5bfe\u8c61\u3092\u7d5e\u3063\u3066\u914d\u4fe1\u3067\u304d\u307e\u3059<\/li>\n<\/ul>\n<p>\u6697\u53f7\u5316\u3084\u8a8d\u8a3c\u3078\u306e\u5bfe\u5fdc\u3068\u3001\u76f4\u611f\u7684\u306b\u4f7f\u3048\u308b\u64cd\u4f5c\u6027\u3092\u4e21\u7acb\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u306f\u3058\u3081\u3066\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306b\u53d6\u308a\u7d44\u3080\u4f01\u696d\u306b\u3082\u6271\u3044\u3084\u3059\u3044\u30b7\u30b9\u30c6\u30e0\u3067\u3059\u3002\u307e\u305a\u306f\u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb\u3067\u64cd\u4f5c\u611f\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u516c\u5f0f\u30b5\u30a4\u30c8\uff1a<a href=\"https:\/\/blastmail.jp\/\" target=\"_blank\" rel=\"noopener\">\u30b7\u30a7\u30a21\u4f4d\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u300c\u30d6\u30e9\u30b9\u30c8\u30e1\u30fc\u30eb\u300d<\/a><\/p>\n<div class=\"su-button-center\"><a href=\"https:\/\/blastmail.jp\/order\/input\" class=\"su-button su-button-style-flat event_bnr\" style=\"color:#FFFFFF;background-color:#c12620;border-color:#9b1f1a;border-radius:5px\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color:#FFFFFF;padding:0px 34px;font-size:25px;line-height:50px;border-color:#d46863;border-radius:5px;text-shadow:none\"> \u30d6\u30e9\u30b9\u30c8\u30e1\u30fc\u30eb\u3092\u7121\u6599\u3067\u8a66\u3059 &gt;<\/span><\/a><\/div>\n<p>\u203b\u30df\u30c3\u30afIT\u30ea\u30dd\u30fc\u30c82025\u5e748\u6708\u53f7\u300c\u30af\u30e9\u30a6\u30c9\u578be\u30e1\u30fc\u30eb\u4e00\u6589\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u306e\u5e02\u5834\u52d5\u5411\u3068\u4e2d\u671f\u4e88\u6e2c\uff08\u58f2\u4e0a\u9ad8\/\u30a2\u30af\u30c6\u30a3\u30d6\u6cd5\u4eba\u9867\u5ba2\u6570\uff09\u300d\u3088\u308a<\/p>\n<h2>\u304a\u3059\u3059\u3081\u306e\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u300cblastengine\u300d<\/h2>\n<p><a href=\"https:\/\/blastengine.jp\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/blastmail.jp\/blog\/wp-content\/uploads\/2025\/10\/blastengine.jpg\" alt=\"blastengine\u306e\u30a2\u30a4\u30ad\u30e3\u30c3\u30c1\u753b\u50cf\" width=\"1303\" height=\"590\" class=\"alignnone wp-image-19575 size-full\" \/><\/a><\/p>\n<p>blastengine\uff08\u30d6\u30e9\u30b9\u30c8\u30a8\u30f3\u30b8\u30f3\uff09\u306f\u3001\u304a\u5ba2\u69d8\u306e\u30b7\u30b9\u30c6\u30e0\u3068SMTP\u30ea\u30ec\u30fc\u3084API\u3067\u9023\u643a\u3057\u3001\u4e00\u6589\u914d\u4fe1\u3084\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3092\u9ad8\u901f\u306b\u9001\u4fe1\u3067\u304d\u308b\u30e1\u30fc\u30eb\u914d\u4fe1\u30b5\u30fc\u30d3\u30b9\u3067\u3059\u3002\u904b\u7528\u30fb\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3092\u30d6\u30e9\u30b9\u30c8\u30a8\u30f3\u30b8\u30f3\u5074\u3067\u884c\u3046\u305f\u3081\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u306e\u8ca0\u62c5\u304b\u3089\u89e3\u653e\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>SPF\/DKIM\/DMARC\u30fbTLS\u5bfe\u5fdc<\/strong>\uff1a\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u3068\u7d4c\u8def\u306e\u6697\u53f7\u5316\u306b\u6a19\u6e96\u5bfe\u5fdc\u3057\u3001\u306a\u308a\u3059\u307e\u3057\u30fb\u76d7\u8074\u306e\u30ea\u30b9\u30af\u3092\u6291\u3048\u307e\u3059<\/li>\n<li><strong>API\u9023\u643a\u30fbSMTP\u30ea\u30ec\u30fc<\/strong>\uff1a\u65e2\u5b58\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u7d44\u307f\u8fbc\u307f\u304c\u5bb9\u6613\u3067\u3001\u6700\u77ed\u5f53\u65e5\u304b\u3089\u5229\u7528\u3092\u958b\u59cb\u3067\u304d\u307e\u3059<\/li>\n<li><strong>99%\u4ee5\u4e0a\u306e\u9ad8\u3044\u5230\u9054\u7387<\/strong>\uff1a\u56fd\u5185\u30ad\u30e3\u30ea\u30a2\u30fbISP\u3078\u306e\u500b\u5225\u9001\u4fe1\u30ed\u30b8\u30c3\u30af\u3067\u78ba\u5b9f\u306b\u5c4a\u3051\u307e\u3059<\/li>\n<li><strong>\u30d0\u30a6\u30f3\u30b9\u30e1\u30fc\u30eb\u81ea\u52d5\u5bfe\u5fdc<\/strong>\uff1a\u30a8\u30e9\u30fc\u30e1\u30fc\u30eb\u7ba1\u7406\u3092\u81ea\u52d5\u5316\u3057\u3001\u904b\u7528\u8ca0\u8377\u3092\u6291\u3048\u307e\u3059<\/li>\n<\/ul>\n<p>\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u3084\u6697\u53f7\u5316\u306b\u6a19\u6e96\u5bfe\u5fdc\u3057\u305f\u57fa\u76e4\u3092\u3001\u30b7\u30b9\u30c6\u30e0\u9023\u643a\u3067\u78ba\u5b9f\u306b\u5229\u7528\u3057\u305f\u3044\u4f01\u696d\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5165\u529b\u306e\u307f\u3067\u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u30d6\u30e9\u30b9\u30c8\u30a8\u30f3\u30b8\u30f3\u516c\u5f0f\u30b5\u30a4\u30c8\uff1a<a href=\"https:\/\/blastengine.jp\/\" target=\"_blank\" rel=\"noopener\">https:\/\/blastengine.jp\/<\/a><\/p>\n<div class=\"su-button-center\"><a href=\"https:\/\/app.engn.jp\/be\/order\/request-form\" class=\"su-button su-button-style-flat event_bnr\" style=\"color:#FFFFFF;background-color:#c12620;border-color:#9b1f1a;border-radius:5px\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color:#FFFFFF;padding:0px 34px;font-size:25px;line-height:50px;border-color:#d46863;border-radius:5px;text-shadow:none\"> blastengine\u3092\u7121\u6599\u3067\u8a66\u3059 &gt;<\/span><\/a><\/div>\n<div class=\"blog-faq\"><h2 class=\"blog-faq__title\">FAQ<\/h2><dl class=\"blog-faq__list\">\n<dt class=\"blog-faq__question\">Q\uff1aSTARTTLS\u3068SMTPS\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/dt><dd class=\"blog-faq__answer\">A\uff1a\u6697\u53f7\u5316\u3092\u59cb\u3081\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u7570\u306a\u308a\u307e\u3059\u3002<strong>STARTTLS\u306f\u5e73\u6587\u3067\u63a5\u7d9a\u3057\u3066\u304b\u3089\u9014\u4e2d\u3067\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u3048\u308b<\/strong>\u65b9\u5f0f\u3067\u300125\u756a\u30fb587\u756a\u306a\u3069\u306e\u65e2\u5b58\u306e\u30dd\u30fc\u30c8\u3092\u4f7f\u3044\u307e\u3059\u3002\u4e00\u65b9SMTPS\u306f\u63a5\u7d9a\u3057\u305f\u6700\u521d\u304b\u3089\u6697\u53f7\u5316\u3092\u884c\u3044\u3001\u5c02\u7528\u306e465\u756a\u30dd\u30fc\u30c8\u3092\u4f7f\u3044\u307e\u3059\u3002<\/dd>\n<dt class=\"blog-faq__question\">Q\uff1aSTARTTLS\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u30e1\u30fc\u30eb\u306f\u5fc5\u305a\u6697\u53f7\u5316\u3055\u308c\u307e\u3059\u304b\uff1f<\/dt><dd class=\"blog-faq__answer\">A\uff1a\u5fc5\u305a\u3057\u3082\u6697\u53f7\u5316\u3055\u308c\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002STARTTLS\u306f<strong>\u9001\u308b\u5074\u3068\u53d7\u3051\u53d6\u308b\u5074\u306e\u53cc\u65b9\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u5834\u5408\u306e\u307f\u6697\u53f7\u5316<\/strong>\u3055\u308c\u3001\u76f8\u624b\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u5e73\u6587\u3067\u9001\u4fe1\u3055\u308c\u307e\u3059\u3002\u6697\u53f7\u5316\u3092\u5fc5\u9808\u306b\u3057\u305f\u3044\u5834\u5408\u306f\u3001MTA-STS\u306a\u3069\u306e\u4ed5\u7d44\u307f\u3092\u4f75\u7528\u3057\u307e\u3059\u3002<\/dd>\n<dt class=\"blog-faq__question\">Q\uff1aSTARTTLS\u3067\u306a\u308a\u3059\u307e\u3057\u30e1\u30fc\u30eb\u306f\u9632\u3052\u307e\u3059\u304b\uff1f<\/dt><dd class=\"blog-faq__answer\">A\uff1a\u9632\u3052\u307e\u305b\u3093\u3002STARTTLS\u304c\u5bfe\u7b56\u3059\u308b\u306e\u306f<strong>\u76d7\u8074\u30fb\u6539\u3056\u3093<\/strong>\u3067\u3001\u5dee\u51fa\u4eba\u306e\u306a\u308a\u3059\u307e\u3057\u306f\u5bfe\u8c61\u5916\u3067\u3059\u3002\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u306b\u306f\u3001SPF\u30fbDKIM\u30fbDMARC\u3068\u3044\u3063\u305f\u9001\u4fe1\u30c9\u30e1\u30a4\u30f3\u8a8d\u8a3c\u3092\u5229\u7528\u3057\u307e\u3059\u3002<\/dd>\n<dt class=\"blog-faq__question\">Q\uff1aGmail\u5b9b\u3066\u306e\u9001\u4fe1\u3067STARTTLS\u306f\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/dt><dd class=\"blog-faq__answer\">A\uff1a\u5fc5\u8981\u3067\u3059\u3002Google\u306f2024\u5e742\u6708\u4ee5\u964d\u3001Gmail\u5b9b\u3066\u306b\u9001\u308b\u3059\u3079\u3066\u306e\u9001\u4fe1\u8005\u306b<strong>\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\uff08TLS\u63a5\u7d9a\uff09<\/strong>\u3092\u6c42\u3081\u3066\u304a\u308a\u3001\u3053\u308c\u306fSTARTTLS\u306b\u3088\u3063\u3066\u5b9f\u73fe\u3055\u308c\u307e\u3059\u3002\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u3068\u30e1\u30fc\u30eb\u304c\u62d2\u5426\u30fb\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/dd>\n<\/dl><\/div>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>STARTTLS\u306f\u3001\u5e73\u6587\u3067\u59cb\u307e\u3063\u305f\u30e1\u30fc\u30eb\u306e\u901a\u4fe1\u3092\u3001\u9014\u4e2d\u304b\u3089\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u3048\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u300c\u76f8\u624b\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u308c\u3070\u6697\u53f7\u5316\u3059\u308b\u300d\u3068\u3044\u3046\u6027\u8cea\u304b\u3089\u3001\u65e2\u5b58\u306e\u30dd\u30fc\u30c8\u3067\u5c0e\u5165\u3057\u3084\u3059\u304f\u76f8\u624b\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u304f\u3066\u3082\u30e1\u30fc\u30eb\u306f\u5c4a\u304f\u4e00\u65b9\u3001\u76f8\u624b\u6b21\u7b2c\u3067\u5e73\u6587\u306b\u306a\u308a\u3001\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u653b\u6483\u306e\u4f59\u5730\u3082\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5f31\u70b9\u3092\u88dc\u3046MTA-STS\u3084DANE\u3001\u306a\u308a\u3059\u307e\u3057\u3092\u9632\u3050SPF\u30fbDKIM\u30fbDMARC\u3001\u30e1\u30fc\u30eb\u672c\u6587\u305d\u306e\u3082\u306e\u3092\u5b88\u308bS\/MIME\u306a\u3069\u306f\u3001\u305d\u308c\u305e\u308c\u5b88\u5099\u7bc4\u56f2\u304c\u7570\u306a\u308a\u307e\u3059\u3002STARTTLS\u3068\u5f79\u5272\u3092\u5206\u3051\u3066\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u3001\u5b89\u5168\u306a\u30e1\u30fc\u30eb\u904b\u7528\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<p>Google\u306e\u9001\u4fe1\u8005\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3067\u6697\u53f7\u5316\u3055\u308c\u305f\u901a\u4fe1\u304c\u6c42\u3081\u3089\u308c\u308b\u306a\u3069\u3001\u7d4c\u8def\u306e\u6697\u53f7\u5316\u306f\u57fa\u672c\u306e\u8981\u4ef6\u306b\u306a\u308a\u3064\u3064\u3042\u308a\u307e\u3059\u3002\u6697\u53f7\u5316\u3084\u306a\u308a\u3059\u307e\u3057\u5bfe\u7b56\u306b\u6a19\u6e96\u5bfe\u5fdc\u3057\u305f\u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8a2d\u5b9a\u3068\u904b\u7528\u306e\u8ca0\u62c5\u3092\u6291\u3048\u306a\u304c\u3089\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3092\u6574\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>STARTTLS\u306f\u3001\u30e1\u30fc\u30eb\u3092\u9001\u308b\u3068\u304d\u306e\u901a\u4fe1\u3092\u3001\u9014\u4e2d\u304b\u3089\u6697\u53f7\u5316\u306b\u5207\u308a\u66ff\u3048\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u306b\u306f&#8230;<\/p>\n","protected":false},"author":8,"featured_media":4333,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-4332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spam"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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property=\"og:image:width\" content=\"680\" \/>\n\t\t<meta property=\"og:image:height\" content=\"481\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-07-28T01:01:17+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-08-04T02:47:21+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:site\" content=\"@blastmail\" \/>\n\t\t<meta name=\"twitter:title\" content=\"STARTTLS\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u30fbSSL\/TLS\u3068\u306e\u9055\u3044\u30fb\u30e1\u30ea\u30c3\u30c8\u307e\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac | \u30e1\u30fc\u30eb\u914d\u4fe1\u30b7\u30b9\u30c6\u30e0\u300cblastmail\u300dOffical Blog\" \/>\n\t\t<meta name=\"twitter:description\" 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