Unknown user: user@soner.com.uk
RCPT TO generated following response:
550-Verification failed for <hen@line.com>
550-It appears that the DNS operator for chinaoffice.biz
550-has installed an invalid MX record with an IP address
550-instead of a domain name on the right hand side.
550 Sender verify failed
这个是我发邮件给hen@line.com但系统返回一条这样的错误信息。请帮忙看看,谁遇到过这样的问题。谢谢!