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你必須先在mailgun中設定好自有的網域，這樣你才能在gmail中設定用mailgun的自有網域寄信...
首先在gmail中，如下圖①來新增一個寄信用的電子郵件地址。
②之處的xxx@你的網域是你已經在mailgun中已設定過了。
登入你的mailgun複製如下圖紅色123中的資訊，再轉貼至剛剛的gmail新增寄信地址的對應欄位。
收信，它會寄到剛剛設定的email地址中，例我此處是「info@0800happy.com」，將信中驗證碼填入如下圖的位置即可完成。
以後在gmail中不管是要寫或回信，就可以選擇寄件人是剛剛你設好的那個自有網域的信箱了。
這篇算是一點重點筆記，並不是對mailgun郵件服務的從0開始申請的教學，mailgun的申請在網路上有很多，以後有機會也來寫一篇介紹。
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