{"id":10708,"date":"2025-03-17T10:06:39","date_gmt":"2025-03-17T01:06:39","guid":{"rendered":"https:\/\/www.k-in.co.jp\/niwakan\/?p=10708"},"modified":"2025-03-17T10:06:39","modified_gmt":"2025-03-17T01:06:39","slug":"tls-is-required-but-was-not-offered-by-host","status":"publish","type":"post","link":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/","title":{"rendered":"TLS is required, but was not offered by host"},"content":{"rendered":"<p>k-in\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089Gmail\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u306e\u3067\u3001\u4ed6\u306e\u4eba\u306e\u3068\u3053\u308d\u306b\u3082\u9001\u3063\u3066\u307f\u305f\u3002<br \/>\n\u3059\u308b\u3068Mail Delivery System\u304b\u3089\u8ee2\u9001\u3067\u304d\u306a\u304b\u3063\u305f\u3068\u2026\u2026\u3042\u308c\u3063\uff1f<br \/>\n<!--more--><\/p>\n<p>\u5185\u5bb9\u7684\u306b\u306f\u3053\u3046\u3067\u3042\u308b\u3002<\/p>\n<div style=\"background: #F2EAD4; padding: 15px; border: 0px solid #F2EAD4; border-radius: 10px; word-break: break-all;\">This is the mail system at host mail.k-in.co.jp.<\/p>\n<p>I&#8217;m sorry to have to inform you that your message could not<br \/>\nbe delivered to one or more recipients. It&#8217;s attached below.<\/p>\n<p>For further assistance, please send mail to postmaster.<\/p>\n<p>If you do so, please include this problem report. You can<br \/>\ndelete your own text from the attached returned message.<\/p>\n<p>                  The mail system<\/p>\n<p><sample@examle.jp>: TLS is required, but was not offered by host<br \/>\n   mail.example.jp[xxx.xxx.xxx.xxx]<\/div>\n<p>Google\u3055\u3093\u306b\u7ffb\u8a33\u3092\u983c\u307f\u307e\u3059\u3002<\/p>\n<div style=\"background: #F2EAD4; padding: 15px; border: 0px solid #F2EAD4; border-radius: 10px; word-break: break-all;\">\u3053\u308c\u306f\u30db\u30b9\u30c8 mail.k-in.co.jp \u306e\u30e1\u30fc\u30eb \u30b7\u30b9\u30c6\u30e0\u3067\u3059\u3002<\/p>\n<p>\u7533\u3057\u8a33\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092 1 \u4eba\u4ee5\u4e0a\u306e\u53d7\u4fe1\u8005\u306b\u914d\u4fe1\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002 \u4ee5\u4e0b\u306b\u6dfb\u4ed8\u3057\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u30b5\u30dd\u30fc\u30c8\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001postmaster \u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u305d\u306e\u5834\u5408\u306f\u3001\u3053\u306e\u554f\u984c\u30ec\u30dd\u30fc\u30c8\u3092\u542b\u3081\u3066\u304f\u3060\u3055\u3044\u3002 \u6dfb\u4ed8\u3055\u308c\u305f\u8fd4\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8\u304b\u3089\u81ea\u5206\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u524a\u9664\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30fc\u30eb \u30b7\u30b9\u30c6\u30e0<\/p>\n<p><sample@examle.jp>: TLS \u304c\u5fc5\u8981\u3067\u3059\u304c\u3001\u30db\u30b9\u30c8 mail.example.jp[xxx.xxx.xxx.xxx] \u3067\u306f\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u305b\u3093<\/div>\n<p>\u4f55\u3060\u304b\u306a\uff1f<\/p>\n<p>\u3084\u306f\u308aGoogle\u3055\u3093\u306b\u554f\u3046\u3068\u3001\u300e<a href=\"https:\/\/blog.treedown.net\/entry\/2021\/07\/13\/003000\">TLS is required\u3067SMTP\u30b5\u30fc\u30d0\u304c\u9001\u4fe1\u3067\u304d\u306a\u304f\u306a\u308b<\/a>\u300f\u3068\u540c\u3058\u72b6\u6cc1\u306e\u65b9\u304c\u304a\u308a\u3001\u89e3\u6c7a\u3055\u308c\u3066\u3044\u305f\u3088\u3046\u306a\u306e\u3067\u540c\u69d8\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u5909\u66f4\u5185\u5bb9\u3068\u3057\u3066\u306f\u3001postfix\u306emain.cf\u5185\u306e\u300esmtp_tls_security_level = encrypt\u300f\u3001\u3053\u306e<strong>encrypt<\/strong>\u3092<strong>any<\/strong>\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u3057\u305f\u3002<br \/>\n\u3055\u3066\u3001\u6b64\u308c\u3067\u66ab\u304f\u69d8\u5b50\u3092\u898b\u3088\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>k-in\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089Gmail\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u306e\u3067\u3001\u4ed6\u306e\u4eba\u306e\u3068\u3053\u308d\u306b\u3082\u9001\u3063\u3066\u307f\u305f\u3002 \u3059\u308b\u3068Mail Delivery System\u304b\u3089\u8ee2\u9001\u3067\u304d\u306a\u304b\u3063\u305f\u3068\u2026\u2026\u3042\u308c\u3063\uff1f<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[115],"tags":[176,175,148],"class_list":["post-10708","post","type-post","status-publish","format-standard","hentry","category-software","tag-mail","tag-postfix","tag-server"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TLS is required, but was not offered by host - \u306b\u308f\u7ba1<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TLS is required, but was not offered by host - \u306b\u308f\u7ba1\" \/>\n<meta property=\"og:description\" content=\"k-in\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089Gmail\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u306e\u3067\u3001\u4ed6\u306e\u4eba\u306e\u3068\u3053\u308d\u306b\u3082\u9001\u3063\u3066\u307f\u305f\u3002 \u3059\u308b\u3068Mail Delivery System\u304b\u3089\u8ee2\u9001\u3067\u304d\u306a\u304b\u3063\u305f\u3068\u2026\u2026\u3042\u308c\u3063\uff1f\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/\" \/>\n<meta property=\"og:site_name\" content=\"\u306b\u308f\u7ba1\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-17T01:06:39+00:00\" \/>\n<meta name=\"author\" content=\"foopa\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"foopa\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/\"},\"author\":{\"name\":\"foopa\",\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/#\\\/schema\\\/person\\\/f391e5f7ead613c234758df1c63e76cb\"},\"headline\":\"TLS is required, but was not offered by host\",\"datePublished\":\"2025-03-17T01:06:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/\"},\"wordCount\":125,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/#\\\/schema\\\/person\\\/f391e5f7ead613c234758df1c63e76cb\"},\"keywords\":[\"Mail\",\"Postfix\",\"Server\"],\"articleSection\":[\"\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\"],\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/\",\"url\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/\",\"name\":\"TLS is required, but was not offered by host - \u306b\u308f\u7ba1\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/#website\"},\"datePublished\":\"2025-03-17T01:06:39+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/2025\\\/03\\\/10708\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u30db\u30fc\u30e0\",\"item\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"TLS is required, but was not offered by host\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/#website\",\"url\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/\",\"name\":\"\u306b\u308f\u7ba1\",\"description\":\"\u52d5\u3044\u3066\u3044\u307e\u3059\u3002\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/#\\\/schema\\\/person\\\/f391e5f7ead613c234758df1c63e76cb\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ja\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/#\\\/schema\\\/person\\\/f391e5f7ead613c234758df1c63e76cb\",\"name\":\"foopa\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\\\/\\\/i0.wp.com\\\/www.k-in.co.jp\\\/niwakan\\\/wp-content\\\/uploads\\\/2020\\\/01\\\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1\",\"url\":\"https:\\\/\\\/i0.wp.com\\\/www.k-in.co.jp\\\/niwakan\\\/wp-content\\\/uploads\\\/2020\\\/01\\\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1\",\"contentUrl\":\"https:\\\/\\\/i0.wp.com\\\/www.k-in.co.jp\\\/niwakan\\\/wp-content\\\/uploads\\\/2020\\\/01\\\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1\",\"width\":250,\"height\":250,\"caption\":\"foopa\"},\"logo\":{\"@id\":\"https:\\\/\\\/i0.wp.com\\\/www.k-in.co.jp\\\/niwakan\\\/wp-content\\\/uploads\\\/2020\\\/01\\\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1\"},\"url\":\"https:\\\/\\\/www.k-in.co.jp\\\/niwakan\\\/archives\\\/author\\\/foopa\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"TLS is required, but was not offered by host - \u306b\u308f\u7ba1","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/","og_locale":"ja_JP","og_type":"article","og_title":"TLS is required, but was not offered by host - \u306b\u308f\u7ba1","og_description":"k-in\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089Gmail\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u306e\u3067\u3001\u4ed6\u306e\u4eba\u306e\u3068\u3053\u308d\u306b\u3082\u9001\u3063\u3066\u307f\u305f\u3002 \u3059\u308b\u3068Mail Delivery System\u304b\u3089\u8ee2\u9001\u3067\u304d\u306a\u304b\u3063\u305f\u3068\u2026\u2026\u3042\u308c\u3063\uff1f","og_url":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/","og_site_name":"\u306b\u308f\u7ba1","article_published_time":"2025-03-17T01:06:39+00:00","author":"foopa","twitter_card":"summary_large_image","twitter_misc":{"\u57f7\u7b46\u8005":"foopa","\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593":"1\u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/#article","isPartOf":{"@id":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/"},"author":{"name":"foopa","@id":"https:\/\/www.k-in.co.jp\/niwakan\/#\/schema\/person\/f391e5f7ead613c234758df1c63e76cb"},"headline":"TLS is required, but was not offered by host","datePublished":"2025-03-17T01:06:39+00:00","mainEntityOfPage":{"@id":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/"},"wordCount":125,"commentCount":0,"publisher":{"@id":"https:\/\/www.k-in.co.jp\/niwakan\/#\/schema\/person\/f391e5f7ead613c234758df1c63e76cb"},"keywords":["Mail","Postfix","Server"],"articleSection":["\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2"],"inLanguage":"ja","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/","url":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/","name":"TLS is required, but was not offered by host - \u306b\u308f\u7ba1","isPartOf":{"@id":"https:\/\/www.k-in.co.jp\/niwakan\/#website"},"datePublished":"2025-03-17T01:06:39+00:00","breadcrumb":{"@id":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/2025\/03\/10708\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u30db\u30fc\u30e0","item":"https:\/\/www.k-in.co.jp\/niwakan\/"},{"@type":"ListItem","position":2,"name":"TLS is required, but was not offered by host"}]},{"@type":"WebSite","@id":"https:\/\/www.k-in.co.jp\/niwakan\/#website","url":"https:\/\/www.k-in.co.jp\/niwakan\/","name":"\u306b\u308f\u7ba1","description":"\u52d5\u3044\u3066\u3044\u307e\u3059\u3002","publisher":{"@id":"https:\/\/www.k-in.co.jp\/niwakan\/#\/schema\/person\/f391e5f7ead613c234758df1c63e76cb"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.k-in.co.jp\/niwakan\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ja"},{"@type":["Person","Organization"],"@id":"https:\/\/www.k-in.co.jp\/niwakan\/#\/schema\/person\/f391e5f7ead613c234758df1c63e76cb","name":"foopa","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/i0.wp.com\/www.k-in.co.jp\/niwakan\/wp-content\/uploads\/2020\/01\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1","url":"https:\/\/i0.wp.com\/www.k-in.co.jp\/niwakan\/wp-content\/uploads\/2020\/01\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1","contentUrl":"https:\/\/i0.wp.com\/www.k-in.co.jp\/niwakan\/wp-content\/uploads\/2020\/01\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1","width":250,"height":250,"caption":"foopa"},"logo":{"@id":"https:\/\/i0.wp.com\/www.k-in.co.jp\/niwakan\/wp-content\/uploads\/2020\/01\/cropped-fe09cc738fa0d92fa2f2dea62be32c82-2-1.png?fit=250%2C250&ssl=1"},"url":"https:\/\/www.k-in.co.jp\/niwakan\/archives\/author\/foopa\/"}]}},"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/posts\/10708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/comments?post=10708"}],"version-history":[{"count":0,"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/posts\/10708\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/media?parent=10708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/categories?post=10708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.k-in.co.jp\/niwakan\/wp-json\/wp\/v2\/tags?post=10708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}