Subject: Delivery Status Notification (Failure)
From: "Mail Delivery System" <[email-masked]>
To: [email-masked]
Date: 26 Oct 2022 15:27:22 +0200

The following message to <[email-masked]> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error [email-masked] unknown user account'