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<h3><a href="/article/net-chinese-dns-service-failed/">雜念-網路中文 Net-chinese 的DNS 服務有問題</a></h3>
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<span class="date moment">2017-07-07</span>
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<p>昨天為了要測試Nginx Reverse Proxy 去網路中文改了dns，今天發現都過一天了還沒有更新。</p>
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<p>然後昨天有user反應寄給廠商的信件被退信，退信原因是 <code>550 Sender verify failed</code> 本來想說應該是對方email Server的問題。
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但是今天早上換成另外一家廠商的信件因為這原因被退信，一次有可能是誤會，連續兩三次，就有鬼了。</p>
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<p>於是開始檢查相關的設定，一開始先想到是postfix，但是我沒有更改postfix的任何設定，這兩天只有去網路中文的dns設定新增兩筆、修改一筆DNS的 A Record，而且還沒生效，懷疑是不是這邊有問題。所以一筆一筆A Record查，查了幾個都ok，正想說大概不是這邊的問題了吧。結果就發現我的MX 指定的 A Record解不出來！？改用在日本的VPS去解也是一樣，果然就是這邊出狀況了。</p>
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<p>於是一筆一筆檢查，發現就是昨天新增修改的紀錄，還有這筆MX Record的指向有問題，馬上跟網路中文反應，客服小姐經過一番測試之後，說會跟工程師反應，然後聯絡我，經過大概一個小時之後，就可以正常解析了，不過我還是沒接到工程師的電話來解釋原因。</p>
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<p>就在打這篇的同時，網路中文的客服打電話來通知正常了，但是也不知道為什麼會有這問題，我請她轉告工程師，告訴我原因，再來等看看會不會有答案好了。</p>
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<p>##<strong>更新</strong></p>
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<p>以下是客服來信內容</p>
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<pre><code>您好：
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工程師回應：
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不是
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pam 因為被設定成系統字，所以設定下去後，剛好紀錄順序排在
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nopam 下面的
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scm
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wm
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都會不回應。
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謝謝
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</code></pre>
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