Subject: Mail Delivery Failure

From: Mail Delivery System <[email-masked]>
Date: Tue, 13 Jan 2026 07:03:03 +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 [DU6PEPF0000B620.eurprd02.prod.outlook.com 2026-01-13T07:03:03.171Z 08DE4E3F09B0FF0B]

The message subject was: Lär dig hantera dagsljuskraven i Boverkets nya byggregler
The message date was: Tue, 13 Jan 2026 08:02:58 +0100
The message identifier was: 22/A3-17649-62EE5696
The message reference was: server-5.tower-878.messagelabs.com!1768287780!53245!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.