Subject: Mail Delivery Failure

From: Mail Delivery System <[email-masked]>
Date: Thu, 08 Jan 2026 07:01:02 +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 [DB1PEPF0003922D.eurprd03.prod.outlook.com 2026-01-08T07:01:02.740Z 08DE4E7BA71BAC95]

The message subject was: Kurs om tappvattensystem - energieffektivisering och legionella
The message date was: Thu, 08 Jan 2026 08:01:00 +0100
The message identifier was: E6/09-30126-E265F596
The message reference was: server-6.tower-830.messagelabs.com!1767855660!42027!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.