Mail delivery failed : returning message to sender
Mail Delivery System
Mailer-Daemon at mail2world-inbound-0912.c09.cynet
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 [188.8.131.52]
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 184.108.40.206
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