Subject: Delivery Status Notification (Failure)

From: "Mail Delivery System" <[email-masked]>
Date: 19 Sep 2025 14:50:26 +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 [DB3PEPF00008860.eurprd02.prod.outlook.com 2025-09-19T12:50:27.066Z 08DDF4597F7830FB]'