550 unknown user (in reply to RCPT TO command).

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• 英语翻译This is the Postfix program at host bjd.com.cn.I'm sorry to have to inform you that the message returnedbelow could not be delivered to one or more destinations.For further assistance,please send mail to If you do so,please include this problem report.You candelete your own text from the message returned below.The Postfix program:user unknown.Command output:/usr/local/bin/maildrop:Invalid user specified.
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