Subject: Mail delivery failed: returning message to sender

From: Mail Delivery System <[email-masked]>
Date: Fri, 19 Dec 2025 04:42:14 -0800

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 mailcluster.loopia.se [2a02:250:0:48::13]
    SMTP error from remote mail server after end of data:
    554 5.7.1 Spam message rejected