550 the rcpt account is invalid (in reply to RCPT TO command)来自E-MIAL的退信是什么意思呢?

550 the rcpt account is invalid (in reply to RCPT TO command)来自E-MIAL的退信是什么意思呢? 英语翻译host gmail-smtp-in.l.google.com[209.85.143.114] said:550 5.2.1 The email account that you tried to reach is disabled.u12si3127416tia.3 (in reply to RCPT TO command). 503 RCPT account isn't a local account me at MTA 无法发送邮件, 550 unknown user (in reply to RCPT TO command). “wdlysgs@126.com SMTP error,RCPT TO:550 Invalid post to the account ceiling of the account balance account account account account account His conduct was ------to the police.A.account to B.account for C.account of D.account fro smtp error ,rcpt to:550 unknown 邮件总是被退回 系统退信后显示 我该怎样才可以发邮件 said:550 5.1.1 No such user (in reply to RCPT TO command).我不懂这些英文 qiangqiang5168@126.com SMTP error,RCPT TO:550 Invalid User我在发邮时被退回,出现这样的字样, the balance of the bank account Please enter the email account啥意思