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寄信時看到「5.3.1 Bad recipient address syntax」訊息？

寄信時看到「5.3.1 Bad recipient address syntax (RCPT TO: <略…>)」這類訊息，表示您寄信的收件人地址的格式錯誤，導致SMTP 伺服器拒收，以下為常見的錯誤案例：.

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