{"id":12945,"date":"2026-05-22T11:30:04","date_gmt":"2026-05-22T02:30:04","guid":{"rendered":"https:\/\/sendgrid.kke.co.jp\/blog\/?p=12945"},"modified":"2026-05-22T11:30:41","modified_gmt":"2026-05-22T02:30:41","slug":"%e3%83%9d%e3%83%bc%e3%83%88465%e3%81%a8587%e3%81%ae%e9%81%95%e3%81%84%e3%81%a8%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/sendgrid.kke.co.jp\/blog\/?p=12945","title":{"rendered":"\u30dd\u30fc\u30c8587\u3068465\u306e\u9055\u3044\u3068\u306f\uff1f\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u304b\u89e3\u8aac\uff01"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/05\/20260522_blog.png\" alt=\"\u30dd\u30fc\u30c8587\u3068465\u306e\u9055\u3044\u3068\u306f\uff1f\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u304b\u89e3\u8aac\uff01\" width=\"1200\" height=\"738\" class=\"aligncenter size-full wp-image-20800\" srcset=\"https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/05\/20260522_blog.png 1200w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/05\/20260522_blog-300x185.png 300w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/05\/20260522_blog-1024x630.png 1024w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/05\/20260522_blog-768x472.png 768w, https:\/\/sendgrid.kke.co.jp\/blog\/wp\/wp-content\/uploads\/2026\/05\/20260522_blog-225x139.png 225w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<blockquote>\n<p>\u3053\u306e\u8a18\u4e8b\u306f <a href=\"https:\/\/www.twilio.com\/en-us\/blog\/insights\/whats-the-difference-between-ports-465-and-587\" target=\"_blank\">SMTP Port 587 vs 465: Which Port Should You Use?<\/a> \u306e\u6284\u8a33\u3067\u3059\u3002<\/p>\n<\/blockquote>\n<p>SMTP\u8a2d\u5b9a\u3067\u30dd\u30fc\u30c8587\u3068\u30dd\u30fc\u30c8465\u306e\u3069\u3061\u3089\u3092\u4f7f\u3048\u3070\u3044\u3044\u304b\u60a9\u3093\u3060\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\u3002\u30dd\u30fc\u30c8\u306e\u9078\u629e\u3092\u9593\u9055\u3048\u308b\u3068\u3001\u8a8d\u8a3c\u30a8\u30e9\u30fc\u3084\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u5931\u6557\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u8106\u5f31\u6027\u7b49\u306e\u30c8\u30e9\u30d6\u30eb\u304c\u8d77\u304d\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002SMTP\u30dd\u30fc\u30c8\u5468\u308a\u306e\u3084\u3084\u3053\u3057\u3044\u8a71\u3092\u6574\u7406\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u7d50\u8ad6\uff1a\u8ff7\u3063\u305f\u3089\u307e\u305a\u306f\u30dd\u30fc\u30c8587<\/h3>\n<p>\u30dd\u30fc\u30c8587\u3092\u5229\u7528\u3059\u308b\u306e\u304c\u591a\u304f\u306e\u5834\u5408\u306b\u6700\u5584\u306e\u9078\u629e\u80a2\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u5c02\u7528\u30dd\u30fc\u30c8\u3068\u3057\u3066\u5e83\u304f\u666e\u53ca\u3057\u3066\u3044\u3066\u4e92\u63db\u6027\u304c\u6700\u3082\u9ad8\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u30dd\u30fc\u30c8465\u3082\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u3067\u512a\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u6b74\u53f2\u7684\u7d4c\u7def\u306e\u8907\u96d1\u3055\u3082\u3042\u308a\u3001\u73fe\u5728\u306f\u30dd\u30fc\u30c8587\u306e\u65b9\u304c\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30dd\u30fc\u30c8587\u304c\u63a8\u5968\u3055\u308c\u308b\u30b7\u30fc\u30f3<\/h3>\n<p>\u30dd\u30fc\u30c8587\u306fSTARTTLS\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<a href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=12756\" rel=\"noopener\" target=\"_blank\">STARTTLS<\/a>\u3068\u306f\u3001\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u63a5\u7d9a\u304b\u3089\u958b\u59cb\u3057\u3001\u9014\u4e2d\u3067TLS\u306b\u3088\u308b\u6697\u53f7\u5316\u901a\u4fe1\u306b\u5207\u308a\u66ff\u3048\u308b\u63a5\u7d9a\u65b9\u5f0f\u306e\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u305f\u3081\u3001\u3055\u307e\u3056\u307e\u306a\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u3068\u306e\u4e92\u63db\u6027\u3092\u4fdd\u3061\u3084\u3059\u3044\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3092\u306f\u3058\u3081\u3001\u69d8\u3005\u306a\u30b7\u30fc\u30f3\u3067\u30dd\u30fc\u30c8587\u306e\u5229\u7528\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\uff08Outlook\u3001Thunderbird\u7b49\uff09\u306e\u9001\u4fe1\u8a2d\u5b9a<\/li>\n<li>\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u9001\u4fe1\u8a2d\u5b9a<\/li>\n<li>\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u7b49\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8a2d\u5b9a\u304c\u3055\u308c\u305f\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u304b\u3089\u306e\u9001\u4fe1<\/li>\n<\/ul>\n<p>Twilio SendGrid\u3082\u542b\u3081\u3001\u4e3b\u8981\u306a\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u306e\u591a\u304f\u306f\u30dd\u30fc\u30c8587\u306e\u5229\u7528\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002\u30dd\u30fc\u30c8587\u306f\u8a8d\u8a3c\u4ed8\u304d\u30e1\u30fc\u30eb\u9001\u4fe1\u306e\u6a19\u6e96\u7684\u306a\u30dd\u30fc\u30c8\u3067\u3042\u308a\u3001STARTTLS\u306b\u3088\u308b\u6697\u53f7\u5316\u901a\u4fe1\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u5229\u7528\u3055\u308c\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<h3>\u30dd\u30fc\u30c8465\u304c\u63a8\u5968\u3055\u308c\u308b\u30b7\u30fc\u30f3<\/h3>\n<p>\u3067\u306f\u3001\u30dd\u30fc\u30c8465\u306f\u3069\u3093\u306a\u5834\u5408\u306b\u5229\u7528\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u3002<br \/>\n\u30dd\u30fc\u30c8465\u3067\u306f\u3001\u6700\u521d\u304b\u3089TLS\u3067\u6697\u53f7\u5316\u3055\u308c\u305f\u72b6\u614b\u3067\u63a5\u7d9a\u304c\u59cb\u307e\u308a\u307e\u3059\uff08\u6697\u9ed9\u7684TLS\u3068\u547c\u3073\u307e\u3059\uff09\u3002\u5e38\u306b\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u70b9\u3067\u306f\u5206\u304b\u308a\u3084\u3059\u304f\u5b89\u5168\u306a\u8a2d\u8a08\u3067\u3059\u304c\u3001\u67d4\u8edf\u6027\u304c\u4f4e\u3044\u305f\u3081\u306b\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u30a8\u30e9\u30fc\u3067\u7d42\u308f\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u306a\u3089\u30dd\u30fc\u30c8465\u306e\u5229\u7528\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084ISP\u304c\u30dd\u30fc\u30c8587\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b<\/li>\n<li>\u4ee5\u524d\u304b\u3089\u30dd\u30fc\u30c8465\u3092\u5229\u7528\u3057\u3066\u3044\u3066\u554f\u984c\u306a\u304f\u30e1\u30fc\u30eb\u3092\u9001\u308c\u3066\u3044\u308b<\/li>\n<li>\u4e92\u63db\u6027\u3092\u72a0\u7272\u306b\u3057\u3066\u3082\u3001\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u63a5\u7d9a\u306f\u8a31\u53ef\u3057\u305f\u304f\u306a\u3044<\/li>\n<\/ul>\n<p>\u30dd\u30fc\u30c8465\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u305d\u306e\u6271\u3044\u304c\u4e8c\u8ee2\u4e09\u8ee2\u3057\u3066\u3044\u308b\u7d4c\u7def\u3082\u77e5\u3063\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<br \/>\n1998\u5e74\u306bSTARTTLS\u304c\u767b\u5834\u3057\u305f\u3053\u3068\u3067\u3001\u6697\u9ed9\u7684TLS\u3092\u4f7f\u3046\u30dd\u30fc\u30c8465\u306f\u6a19\u6e96\u7684\u306a\u6271\u3044\u3067\u306f\u306a\u304f\u306a\u308a\u30012001\u5e74\u306b\u306f\u30e1\u30fc\u30eb\u3068\u306f\u7121\u95a2\u4fc2\u306a\u30b5\u30fc\u30d3\u30b9\u306b\u5272\u308a\u5f53\u3066\u76f4\u3055\u308c\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u30dd\u30fc\u30c8465\u3067\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u306f\u65e2\u306b\u5e83\u304f\u666e\u53ca\u3057\u3066\u304a\u308a\u3001\u6b63\u5f0f\u306a\u6a19\u6e96\u3067\u306f\u306a\u3044\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u5e83\u304f\u5229\u7528\u3055\u308c\u7d9a\u3051\u308b\u72b6\u614b\u304c\u9577\u304f\u7d9a\u304d\u307e\u3057\u305f\u3002\u305d\u3057\u30662018\u5e74\u3001\u6697\u9ed9\u7684TLS\u65b9\u5f0f\u304c\u518d\u8a55\u4fa1\u3055\u308c\u3001\u30dd\u30fc\u30c8465\u306f\u30e1\u30fc\u30eb\u9001\u4fe1\u30dd\u30fc\u30c8\u3068\u3057\u3066\u6b63\u5f0f\u306b\u518d\u767b\u9332\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<h3>\u30dd\u30fc\u30c8587\u3068\u30dd\u30fc\u30c8465\u306e\u6bd4\u8f03<\/h3>\n<p>\u3053\u308c\u307e\u3067\u7d39\u4ecb\u3057\u305f\u3088\u3046\u306b\u30012\u3064\u306e\u30dd\u30fc\u30c8\u306e\u9055\u3044\u306f\u63a5\u7d9a\u306e\u6697\u53f7\u5316\u306e\u9055\u3044\u3067\u3059\u3002<\/p>\n<p><strong>\u30dd\u30fc\u30c8587\uff08STARTTLS\uff09<\/strong><\/p>\n<ul>\n<li>\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u3067SMTP\u63a5\u7d9a\u3092\u958b\u59cb\u3057\u3001\u305d\u306e\u5f8cSTARTTLS\u306b\u3088\u3063\u3066\u6697\u53f7\u5316\u901a\u4fe1\u306b\u5207\u308a\u66ff\u3048\u308b<\/li>\n<li>\u305d\u306e\u5f8c\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u9593\u3067\u5408\u610f\u3055\u308c\u305f\u6697\u53f7\u5316\u65b9\u5f0f\u3067\u5b89\u5168\u306b\u901a\u4fe1\u3059\u308b<\/li>\n<li>\u8a2d\u5b9a\u306b\u3088\u3063\u3066\u306f\u3001\u6697\u53f7\u5316\u63a5\u7d9a\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u5e73\u6587\u3067\u901a\u4fe1\u3059\u308b\u3053\u3068\u3082\u3042\u308b<\/li>\n<\/ul>\n<p><strong>\u30dd\u30fc\u30c8465\uff08\u6697\u9ed9\u7684TLS\uff09<\/strong><\/p>\n<ul>\n<li>\u6700\u521d\u304b\u3089TLS\u306b\u3088\u308b\u6697\u53f7\u5316\u901a\u4fe1\u3067SMTP\u63a5\u7d9a\u3092\u884c\u3046<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u3067TLS\u30d0\u30fc\u30b8\u30e7\u30f3\u3084\u6697\u53f7\u5316\u65b9\u5f0f\u304c\u4e00\u81f4\u3057\u306a\u304b\u3063\u305f\u308a\u3001\u30b5\u30fc\u30d0\u8a3c\u660e\u66f8\u306e\u671f\u9650\u304c\u5207\u308c\u3066\u3044\u305f\u308a\u3059\u308b\u3068\u63a5\u7d9a\u304c\u3067\u304d\u306a\u3044<\/li>\n<\/ul>\n<p>\u3064\u307e\u308a\u3001\u30dd\u30fc\u30c8587\uff08STARTTLS\uff09\u3067\u306f\u3001\u6697\u53f7\u5316\u63a5\u7d9a\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u3067\u3082\u8a2d\u5b9a\u306b\u3088\u3063\u3066\u306f\u30e1\u30fc\u30eb\u9001\u4fe1\u3092\u7d99\u7d9a\u3067\u304d\u307e\u3059\u3002\u4e00\u65b9\u3067\u3001\u30dd\u30fc\u30c8465\uff08\u6697\u9ed9\u7684TLS\uff09\u3067\u306f\u3001\u6697\u53f7\u5316\u63a5\u7d9a\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u30e1\u30fc\u30eb\u9001\u4fe1\u306f\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30dd\u30fc\u30c825\u3068\u30dd\u30fc\u30c82525<\/h3>\n<p>SMTP\u8a2d\u5b9a\u306b\u3064\u3044\u3066\u8abf\u3079\u3066\u3044\u308b\u3068\u3001\u30dd\u30fc\u30c8587\u3068\u30dd\u30fc\u30c8465\u306e\u4ed6\u306b\u3082\u3001\u30dd\u30fc\u30c825\u3084\u30dd\u30fc\u30c82525\u304c\u767b\u5834\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30dd\u30fc\u30c825\u306f\u3001\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u9001\u4fe1\u3067\u306f\u306a\u304f\u3001\u4e3b\u306b\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u9593\u901a\u4fe1\uff08<a href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=636\" rel=\"noopener\" target=\"_blank\">SMTP\u30ea\u30ec\u30fc<\/a>\uff09\u306e\u305f\u3081\u306e\u30dd\u30fc\u30c8\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u8a8d\u8a3c\u3092\u524d\u63d0\u3068\u3057\u306a\u3044\u8a2d\u8a08\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u30b9\u30d1\u30e0\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u60aa\u7528\u3055\u308c\u308b\u3053\u3068\u3082\u591a\u304f\u3001\u307b\u3068\u3093\u3069\u306eISP\u306f\u30dd\u30fc\u30c825\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u5229\u7528\u53ef\u80fd\u3067\u3042\u3063\u3066\u3082\u3001\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u306e\u9001\u4fe1\u306b\u306f\u5229\u7528\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30dd\u30fc\u30c82525\u306f\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\u7528\u306b\u516c\u5f0f\u306b\u6a19\u6e96\u5316\u3055\u308c\u305f\u30dd\u30fc\u30c8\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30dd\u30fc\u30c825\u306e\u30d6\u30ed\u30c3\u30af\u304c\u5e83\u307e\u3063\u3066\u3044\u304f\u969b\u306b\u3001\u30dd\u30fc\u30c825\u304c\u4f7f\u3048\u306a\u3044\u5834\u5408\u306e\u4ee3\u66ff\u30dd\u30fc\u30c8\u3068\u3057\u3066\u3001\u5404\u30d7\u30ed\u30d0\u30a4\u30c0\u304c\u975e\u516c\u5f0f\u306b\u5229\u7528\u3057\u59cb\u3081\u307e\u3057\u305f\u3002\u73fe\u5728\u306f\u3001\u30dd\u30fc\u30c8587\u304c\u5229\u7528\u3067\u304d\u306a\u3044\u5834\u5408\u306e\u4ee3\u66ff\u30dd\u30fc\u30c8\u3068\u3057\u3066\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u30b1\u30fc\u30b9\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002<\/p>\n<h3>SMTP\u30dd\u30fc\u30c8\u306e\u6bd4\u8f03<\/h3>\n<p>\u305d\u308c\u305e\u308c\u306e\u30dd\u30fc\u30c8\u306e\u7279\u5fb4\u3092\u8868\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u7279\u5fb4\u3084\u5229\u7528\u30b7\u30fc\u30f3\u3092\u77e5\u3063\u3066\u304a\u3051\u3070\u3001\u3069\u306e\u30dd\u30fc\u30c8\u3092\u4f7f\u3046\u3079\u304d\u304b\u306e\u691c\u8a0e\u306b\u5f79\u7acb\u3064\u3067\u3057\u3087\u3046\u3002<\/p>\n<table>\n<tr>\n<th><strong>\u30dd\u30fc\u30c8<\/strong><\/th>\n<th><strong>\u7528\u9014<\/strong><\/th>\n<th><strong>\u8a8d\u8a3c<\/strong><\/th>\n<th><strong>\u6697\u53f7\u5316<\/strong><\/th>\n<th><strong>\u5229\u7528\u30b7\u30fc\u30f3<\/strong><\/th>\n<\/tr>\n<tr>\n<td>587<\/td>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1<\/td>\n<td>\u5fc5\u9808<\/td>\n<td>STARTTLS<\/td>\n<td>\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u306e\u4e00\u822c\u7684\u306a\u9001\u4fe1<\/td>\n<\/tr>\n<tr>\n<td>465<\/td>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1<\/td>\n<td>\u5fc5\u9808<\/td>\n<td>\u6697\u9ed9\u7684TLS<\/td>\n<td>\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u9001\u4fe1\u3084\u5e38\u6642TLS\u63a5\u7d9a\u3092\u524d\u63d0\u3068\u3059\u308b\u9001\u4fe1<\/td>\n<\/tr>\n<tr>\n<td>25<\/td>\n<td>\u30b5\u30fc\u30d0\u9593\u30ea\u30ec\u30fc<\/td>\n<td>\u901a\u5e38\u4e0d\u8981<\/td>\n<td>\u4efb\u610f<\/td>\n<td>\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u9001\u4fe1\u3067\u306f\u975e\u63a8\u5968<\/td>\n<\/tr>\n<tr>\n<td>2525\u3000<\/td>\n<td>\u975e\u516c\u5f0f\u4ee3\u66ff\u30dd\u30fc\u30c8<\/td>\n<td>\u30b5\u30fc\u30d3\u30b9\u306b\u3088\u308b<\/td>\n<td>\u30b5\u30fc\u30d3\u30b9\u306b\u3088\u308b<\/td>\n<td>587\/465\u304c\u5229\u7528\u3067\u304d\u306a\u3044\u74b0\u5883<\/td>\n<\/tr>\n<\/table>\n<h3>\u307e\u3068\u3081<\/h3>\n<p>\u65b0\u3057\u304fSMTP\u8a2d\u5b9a\u3092\u3059\u308b\u3068\u304d\u306f\u30dd\u30fc\u30c8587\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002\u30dd\u30fc\u30c8587\u306f\u30e1\u30fc\u30eb\u9001\u4fe1\u5c02\u7528\u306e\u30dd\u30fc\u30c8\u3067\u3001\u5e83\u304f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30dd\u30fc\u30c8587\u3067\u4e92\u63db\u6027\u306e\u554f\u984c\u304c\u8d77\u304d\u305f\u5834\u5408\u3084\u7279\u5225\u306a\u610f\u56f3\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u3001\u30dd\u30fc\u30c8465\u3082\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u3067\u306f\u3001\u30dd\u30fc\u30c825\u306f\u907f\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u3088\u304f\u3042\u308b\u8cea\u554f<\/h3>\n<p><strong>Q\uff1a\u6700\u3082\u5b89\u5168\u306aSMTP\u30dd\u30fc\u30c8\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u30dd\u30fc\u30c8465\u3068\u30dd\u30fc\u30c8587\u3067\u3059\u3002STARTTLS\u306b\u306f\u300c\u65e5\u548c\u898bTLS\u300d\u3068\u300c\u5f37\u5236TLS\u300d\u306e2\u3064\u306e\u904b\u7528\u30dd\u30ea\u30b7\u30fc\u304c\u3042\u308a\u3001\u5f37\u5236TLS\u3067\u9069\u5207\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u30dd\u30fc\u30c8587\u306f\u30dd\u30fc\u30c8465\u3068\u540c\u3058\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ec\u30d9\u30eb\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002<br \/>\nSTARTTLS\u306e\u8a73\u7d30\u306f\u3001<a href=\"https:\/\/sendgrid.kke.co.jp\/blog\/?p=12756\" rel=\"noopener\" target=\"_blank\">\u3053\u3061\u3089<\/a>\u306e\u8a18\u4e8b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><strong>Q\uff1a\u306a\u305c\u30dd\u30fc\u30c8587\u3088\u308a\u3082\u30dd\u30fc\u30c8465\u304c\u63a8\u5968\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u53e4\u3044\u6642\u4ee3\u306e\u65b9\u91dd\u3092\u524d\u63d0\u3068\u3057\u3066\u3044\u308b\u5834\u5408\u3084\u3001\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9\u30c6\u30e0\u5411\u3051\u306e\u8a2d\u5b9a\u3092\u6271\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u3001\u30dd\u30fc\u30c8465\u304c\u63a8\u5968\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u4e92\u63db\u6027\u30e1\u30ea\u30c3\u30c8\u3088\u308a\u3082\u65e5\u548c\u898bTLS\u306b\u5bfe\u3059\u308b\u653b\u6483\u3078\u306e\u5099\u3048\u3092\u91cd\u8996\u3059\u308b\u7acb\u5834\u304b\u3089\u3001\u30dd\u30fc\u30c8465\u3092\u52e7\u3081\u3066\u3044\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><strong>Q\uff1a\u30dd\u30fc\u30c825\u3092\u4f7f\u3063\u3066\u30e1\u30fc\u30eb\u3092\u9001\u3063\u3066\u3082\u3044\u3044\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u30dd\u30fc\u30c825\u306f\u3001\u30b5\u30fc\u30d0\u9593SMTP\u30ea\u30ec\u30fc\u306e\u305f\u3081\u306e\u30dd\u30fc\u30c8\u3067\u3059\u3002\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u306e\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u30dd\u30fc\u30c825\u3092\u4f7f\u3046\u306e\u306f\u63a8\u5968\u3067\u304d\u307e\u305b\u3093\u3002\u30dd\u30fc\u30c8587\u307e\u305f\u306f\u30dd\u30fc\u30c8465\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>Q\uff1a\u5168\u3066\u306eSMTP\u30dd\u30fc\u30c8\u304c\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u6642\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u591a\u304f\u306e\u30b5\u30fc\u30d3\u30b9\u3067\u4ee3\u66ff\u30dd\u30fc\u30c8\u3068\u3057\u3066\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u30dd\u30fc\u30c82525\u3092\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002SMTP\u3092\u3084\u3081\u3066\u3001<a href=\"https:\/\/sendgrid.kke.co.jp\/about\/email-api\/\" rel=\"noopener\" target=\"_blank\">SendGrid<\/a>\u306e\u3088\u3046\u306aWeb API\u30d9\u30fc\u30b9\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u306e\u3082\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p><strong>Q\uff1a\u30e1\u30fc\u30eb\u9001\u4fe1\u3068\u30e1\u30fc\u30eb\u53d7\u4fe1\u3067\u306f\u3001\u4f7f\u3046\u30dd\u30fc\u30c8\u306f\u7570\u306a\u308a\u307e\u3059\u304b\uff1f<\/strong><\/p>\n<p>\u7570\u306a\u308a\u307e\u3059\u3002\u30e1\u30fc\u30eb\u9001\u4fe1\u3067\u306f\u30dd\u30fc\u30c8587\u3001465\u300125\u30012525\u304c\u4f7f\u7528\u3055\u308c\u3001\u30e1\u30fc\u30eb\u53d7\u4fe1\u3067\u306f\u30dd\u30fc\u30c8110\u3001995\uff08POP3\uff09\u3084143\u3001993\uff08IMAP\uff09\u306a\u3069\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u306f SMTP Port 587 vs 465: Which Port Should You Use? 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