Subject: Delivery Status Notification (Failure)

From: "Mail Delivery System" <[email-masked]>
Date: 18 Aug 2025 08:24:47 +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 [DB1PEPF000509FF.eurprd03.prod.outlook.com 2025-08-18T06:24:48.141Z 08DDDC26C0A796A1]'

Subject: =?utf-8?b?W0JVTEtdIEzDpHIgZGlnIGtsaW1hdGJlcsOka25pbmcgZ