hi bigtedy:
「任正信」？
關於 smtp response 550：
550 - The requested command failed because the user's mailbox was unavailable (for example because it was not found, or because the command was rejected for policy reasons).
所以可能是收件者無此人，或被 smtp 主機拒絕而被退信。循此原因除錯看看。
另外，如果想要更多幫忙，你應該提供更多資訊，例如你全域設定裡的電子郵件設定值。
lss
