我的邮件被退回,请问原因啊
This message is generated by COREMAIL email system.
I'm sorry to have to inform you that the message returned
你发送到xxx21@naver.com的邮件由于以下原因被退回 :xxx@naver.com SMTP error, RCPT TO: 550 5.1.1 No such user <xxx21@naver.com>
参考答案:找不到用户,邮件地址错误!