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(in reply to RCPT TO command).

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(in reply to RCPT TO command).
(in reply to RCPT TO command).
RCPT 用于
标识邮件的收件人；以 RCPT TO: 的形式使用
IN REPLY TO就是回复
COMMAND是命令,指挥
意思是In reply to RCPT TO command -- 在回复 RCPT TO 命令的时候.
可能是接收端“无此用户”.很可能是你邮址@号前面的东西打错了.
(in reply to RCPT TO command). 550 unknown user (in reply to RCPT TO command). 550 the rcpt account is invalid (in reply to RCPT TO command 请问英语高手in reply to和reply to smtp error ,rcpt to:550 unknown to have nothing to say in reply in reply to 与 in response reply to和reply in的用法和区别,急 In reply to 的中文意思 A Letter in Reply to a Friend reply with reply to 区别～ huangjianqiang1986@163.cm SMTP error,RCPT TO:550 Domain does