Subject: Mail Delivery Failure

From: Mail Delivery System <[email-masked]>
Date: Thu, 08 Jan 2026 07:02:43 +0000

This is the mail delivery agent at Symantec Email Security.cloud.

I was unable to deliver your message to the following addresses:

[email-masked]

Reason: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [DU2PEPF0001E9C1.eurprd03.prod.outlook.com 2026-01-08T07:02:43.338Z 08DE4E7715F4BD9F]

The message subject was: Kurs om tappvattensystem - energieffektivisering och legionella
The message date was: Thu, 08 Jan 2026 08:02:28 +0100
The message identifier was: 3B/73-28178-2965F596
The message reference was: server-8.tower-850.messagelabs.com!1767855761!51601!1

Please do not reply to this email as it is sent from an unattended mailbox.
Contact your email administrator if you need more information, or
instructions for resolving this issue.