Subject: Mail Delivery Failure

From: Mail Delivery System <[email-masked]>
Date: Thu, 08 Jan 2026 07:01:01 +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 [DB5PEPF00014B93.eurprd02.prod.outlook.com 2026-01-08T07:01:01.319Z 08DE4E5A63F33EC0]

The message subject was: Kurs om tappvattensystem - energieffektivisering och legionella
The message date was: Thu, 08 Jan 2026 08:00:59 +0100
The message identifier was: 46/9A-28432-D265F596
The message reference was: server-4.tower-837.messagelabs.com!1767855659!37849!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.