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
    host []
    SMTP error from remote mail server after RCPT TO:<31365474 at>:
    501 This system is not configured to relay mail to <31365474 at> for
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