身為QA人員，有時候也要測試所謂的信件傳送功能，這一週就遇到一種情況是要查看收到的信之所以會delay是不是在背後有什麼原因？最簡單的做法就是看背後一層一層傳遞信件的mail relay server 時間戳記，若某一台server所紀錄收到訊息與前一台server收到的信息的時間相差太大，那就代表在這兩台Server之間發生了delay，底下是邏輯上送信的示意圖：
接著，想要知道信件傳遞經過那些mail server，就必需從email header去查看，以下分兩種，一種是OutLook的查看信件表頭方式，一種是Googlemail。
- Outlook
- 打開信件
- 點選Ribbon選單的FILE(檔案)
- 點取Properities(內容)
- 在Proprtities中便可以看到Internet headers(網路標頭)，該內容就是我們要的網頁表頭。
- Google mail
是常見的web mail，那麼在web mail中又該如何查看信件標頭呢?答案很簡單，就是選取要查看的mail後，找出他的”原始內容”就可以了。
A. 選取gmail中要看的mail
- 點選mail內容右邊的功能選單鈕
- 點取”顯示原始郵件”
- 新開啟的頁面最下方將會顯示mail header
Mail Header的內容是可以自由複製的文字，我們可以把他copy出來存成文字檔再分析內容，其中由文件由下而上便可以看到信件的mail relay server的傳遞路徑與時間：
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2017年8月19日星期六 5:35 PM
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