Subject: Delivery Status Notification (Failure)

From: "Mail Delivery System" <[email-masked]>
Date: 13 Jan 2026 08:02:33 +0100

The following message to <[email-masked]> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [DU6PEPF0000B61F.eurprd02.prod.outlook.com 2026-01-13T07:02:35.239Z 08DE5263B1521E39]'