Mail delivery failed : returning message to sender

Sat Sep 7 01:50:00 UTC 2019

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to all of its recipients.
This is a permanent error. The following address(es) failed:

  31365474 at qq.com
    host m2w-in1.ctmail.com [209.67.128.24]
    SMTP error from remote mail server after RCPT TO:<31365474 at qq.com>:
    501 This system is not configured to relay mail to <31365474 at qq.com> for 216.163.188.208
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