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郵件未能送出(退信)

請參考以下退信原因

 

原因
描述 
沒有找到該收件者
550-5.1.1 The email account that you tried to reach does not exist. 
於帳戶設定內沒有點選「我的(SMTP)伺服器需要驗証」
relay not permitted, authentication required
收件者信箱已滿
Recipient's mailbox is full, message returned to sender.
超過每日限發電郵之上限
Unrouteable address
對方郵箱已滿
Quota exceeded
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