Subject: Mail delivery failed: returning message to sender

From: Mail Delivery System <[email-masked]>
Date: Tue, 14 Oct 2025 01:31:12 -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 [52.101.73.19]
    SMTP error from remote mail server after sending data block:
    554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [AMS1EPF0000004C.eurprd04.prod.outlook.com 2025-10-14T08:31:12.622Z 08DE080753E64AF1]