Subject: Mail Delivery Failure

From: Mail Delivery System <[email-masked]>
Date: Thu, 15 Jan 2026 11:12:16 +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 [DB3PEPF0000885B.eurprd02.prod.outlook.com 2026-01-15T11:12:16.632Z 08DE4E6B34FE45D9]

The message subject was: Lär dig energieffektivisera byggnadens installationssystem
The message date was: Thu, 15 Jan 2026 12:11:57 +0100
The message identifier was: 71/BA-28538-09BC8696
The message reference was: server-2.tower-872.messagelabs.com!1768475524!8808!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.