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

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

550 unknown user (in reply to RCPT TO command).
RCPT TO - 这个电邮发给谁.这是SMTP电邮里的命令
550 -- 550型 错误
unknown user -- 用户名错
in reply to RCPT TO command -- 在回复 RCPT TO 命令的时候.
也就是接收端“无此用户”.邮址@号前面的东西打错了.