Subject: Mail delivery failed: returning message to sender

From: Mail Delivery System <[email-masked]>
Date: Thu, 15 Jan 2026 03:12:36 -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 esem-se.mail.protection.outlook.com [52.101.73.1]
    SMTP error from remote mail server after RCPT TO:<[email-masked]>:
    550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [AM3PEPF00009B9D.eurprd04.prod.outlook.com 2026-01-15T11:12:36.511Z 08DE4E6FA59228A2]