Subject: Undeliverable: Kurs om hur energiförluster minskas i VVC- och tappvattensystem

From: <[email-masked]>
Date: Sun, 7 Dec 2025 07:10:21 +0000

[https://products.office.com/en-us/CMSImages/Office365Logo_Orange.png?version=b8d100a9-0a8b-8e6a-88e1-ef488fee0470]
Your message to [email-masked] couldn't be delivered.
mats.sjoberg wasn't found at alab.com.
19812_4840_840322_bo. . .       Office 365      mats.sjoberg
Action Required                 Recipient
Unknown To address

How to Fix It
The address might be misspelled or might not exist. Try one or more of the following:

  *   Retype the recipient's address, then resend the message - If you're using Outlook, open this non-delivery report message and click Send Again from the menu or ribbon. In Outlook on the web, select this message, and then click the "To send this message again, click here." link located just above the message preview window. In the To or Cc line, delete and then retype the entire recipient's address (ignore any address suggestions). After typing the complete address, click Send to resend the message. If you're using an email program other than Outlook or Outlook on the web, follow its standard way for resending a message. Just be sure to delete and retype the recipient's entire address before resending it.
  *   Remove the recipient from the recipient Auto-Complete List, then resend the message - If you're using Outlook or Outlook on the web, follow the steps in the "Remove the recipient from the recipient Auto-Complete List" section of this article<https://go.microsoft.com/fwlink/?LinkId=532972>. Then resend the message. Be sure to delete and retype the recipient's entire address before clicking Send.
  *   Contact the recipient by some other means, (by phone, for example) to confirm you're using the right address. Ask them if they've set up an email forwarding rule that could be forwarding your message to an incorrect address.

If the problem continues, ask the recipient to tell their email admin about the problem, and give them the error (and the name of the server that reported it) shown below. It's likely that only the recipient's email admin can fix this problem.

Was this helpful? Send feedback to Microsoft<https://go.microsoft.com/fwlink/p/?LinkID=717197>.
________________________________

More Info for Email Admins
Status code: 550 5.4.1

This error occurred because a message was sent to an email address hosted by Office 365, but the address doesn't exist in the receiving organization's Office 365 directory. Directory Based Edge Blocking (DBEB) is enabled for alab.com, and DBEB rejects messages addressed to recipients who don't exist in the receiving organization's Office 365 directory. This error is reported by the recipient domain's email server, but most often it can be fixed by the person who sent the message. If the steps in the How to Fix It section above don't fix the problem, and you're the email admin for the recipient, try one or more of the following:

Check that the email address exists and is correct - Confirm that the recipient address exists in your Office 365 directory, is correct, and is accepting messages.

Synchronize your directories - Make sure directory synchronization is working correctly, and that the recipient's email address exists in both Office 365 and in your on-premises directory.

Check for errant forwarding rules - Check for forwarding rules for the original recipient that might be trying to forward the message to an invalid address. Forwarding can be set up by an admin via mail flow rules or mailbox forwarding address settings, or by the recipient via the Forwarding or Inbox Rules features.

Make sure the recipient has a valid license - Make sure the recipient has an Office 365 license assigned to them. The recipient's email admin can use the Office 365 admin center to assign a license to them (Users > Active Users > Select the recipient > Assigned License > Edit).

Make sure that mail flow settings and MX records are correct - Misconfigured mail flow or MX record settings can cause this error. Check your Office 365 mail flow settings to make sure your domain and any mail flow connectors are set up correctly. Also, work with your domain registrar to make sure the MX records for your domain are set up correctly.

For more information and additional tips to fix this issue, see this article<https://go.microsoft.com/fwlink/?LinkId=532972>.

Original Message Details
Created Date:   12/7/2025 7:10:19 AM
Sender Address: [email-masked]
Recipient Address:      [email-masked]
Subject:        Kurs om hur energiförluster minskas i VVC- och tappvattensystem

Error Details
Error:  550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [AMS0EPF000001AE.eurprd05.prod.outlook.com 2025-12-07T07:10:21.028Z 08DE2E68A28F5F25]
Message rejected by:    AMS0EPF000001AE.mail.protection.outlook.com

Notification Details
Sent by:        DU0PR09MB8141.eurprd09.prod.outlook.com

Message Hops
HOP     TIME (UTC)      FROM    TO      WITH    RELAY TIME
1       12/7/2025
7:10:19 AM      [127.0.0.1]     post.nuhet.se   SMTP    *
2       12/7/2025
7:10:19 AM              post.nuhet.se           *
3       12/7/2025
7:10:19 AM      post.nuhet.se   DB1PEPF00039232.mail.protection.outlook.com     Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384)   *
4       12/7/2025
7:10:12 AM      DB1PEPF00039232.eurprd03.prod.outlook.com       DU7PR01CA0037.outlook.office365.com     Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384)   *
5       12/7/2025
7:10:19 AM      DU7PR01CA0037.eurprd01.prod.exchangelabs.com    DU0PR09MB8141.eurprd09.prod.outlook.com Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384)    7 sec

Original Message Headers

From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Reply-To: [email-masked]
Subject: Kurs om hur energiförluster minskas i VVC- och
 tappvattensystem
Date: Sun, 07 Dec 2025 08:10:19 +0100
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Subject: Kurs om hur energiförluster minskas i VVC- och tappvattensystem
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Date: Sun, 07 Dec 2025 08:10:19 +0100

Legionella och energiförluster i tappvattensystemKurs om hur energiförluster minskas i VVC- och tappvattensystem 
samt hur man förebygger och hanterar utbrott av legionella.