Subject: Delivery Status Notification (Failure)

From: "Mail Delivery System" <[email-masked]>
Date: 14 Oct 2025 10:31:56 +0200

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 [DU2PEPF00028D0D.eurprd03.prod.outlook.com 2025-10-14T08:31:56.384Z 08DE0A330F94DE1D]'