Subject: Delivery Status Notification (Failure)

From: "Mail Delivery System" <[email-masked]>
Date: 04 Sep 2025 08:14:20 +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 [DU2PEPF00028CFE.eurprd03.prod.outlook.com 2025-09-04T06:14:20.117Z 08DDE75EAF431FFF]'

Subject: =?utf-8?q?=5