Subject: Mail delivery failed: returning message to sender

From: Mail Delivery System <[email-masked]>
Date: Wed, 03 Sep 2025 23:19:48 -0700

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 mimer-nu.mail.protection.outlook.com [52.101.73.15]
    SMTP error from remote mail server after sending data block:
    554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [AM4PEPF00027A5E.eurprd04.prod.outlook.com 2025-09-04T06:19:48.384Z 08DDE75A7F7F64FC]