Subject: Mail delivery failed: returning message to sender
From: Mail Delivery System <[email-masked]>
To: [email-masked]
Date: Mon, 26 Aug 2024 09:30:30 +0000

This message was created automatically by mail delivery software.

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

  [email-masked]
    host freemx1.sinamail.sina.com.cn [49.7.36.189]
    SMTP error from remote mail server after DATA:
    554 Rejected due to the sending MTA's poor reputation. Please refer http://mail.sina.com.cn/help2/rwmail.html. p=ca1-554 185.202.113.248