Subject: Mail Delivery Failure

From: Mail Delivery System <[email-masked]>
Date: Thu, 15 Jan 2026 11:12:06 +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 [DU2PEPF00028D0E.eurprd03.prod.outlook.com 2026-01-15T11:12:06.487Z 08DE4E7B64061697]

The message subject was: Lär dig energieffektivisera byggnadens installationssystem
The message date was: Thu, 15 Jan 2026 12:11:56 +0100
The message identifier was: 6B/E4-30758-68BC8696
The message reference was: server-12.tower-850.messagelabs.com!1768475524!94395!1

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