Subject: Undeliverable: Kurs om hur man minskar klimatavtrycket i ROT-projekt

From: <[email-masked]>
Date: Thu, 16 Oct 2025 10:09:51 +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.
Security or policy settings at naijbygg.se have rejected your message.
19812_4824_809458_bo. . .       Office 365      naijbygg.se
Sender          Action Required
Security or policy violation

How to Fix It
The recipient's email server won't accept your message because it appears to violate their security or policy settings. Check the Reported error below to see if you can determine why it was blocked. Then try one or more of the following:

  *   If the error mentions SPF, DKIM, or DMARC issues, forward this message to your email admin for assistance.
  *   The recipient's email server might suspect that your message is spam. Follow the guidance in this article: E-mailing Best Practices for Senders<https://aka.ms/EmailingBestPractices>. Then resend your message.
  *   If the error suggests your message is too large, try to reduce the size of your attachment. If that isn't possible, place the file on a publicly accessible cloud storage location, like OneDrive. Then add a link to the file in your message, and resend the message.
  *   Contact the recipient (by phone, for example) and tell them to ask their email admin to add you or your email domain to their allowed senders list.

If the problem continues, forward this message to your email admin. If you're an email admin, refer to the More Info for Email Admins section below.

Was this helpful? Send feedback to Microsoft<https://go.microsoft.com/fwlink/?LinkId=525928>.
________________________________

More Info for Email Admins
Status code: 550 5.7.1

This error occurs when the recipient's domain has security or policy settings that reject the sender's message. However, we were unable to determine the specific setting that's causing this rejection. Usually the error is reported by an email server outside of Office 365. Common issues include the following: the receiving server suspects the message is malicious or spam; the Sender Policy Framework (SPF) record for post.nuhet.se is incorrectly configured or doesn't exist; or the message includes an attachment larger than the receiving server will accept. Try one or more of the following:

Review the reported error - Check the Reported error shown below to help determine what the issue might be. For example, if the issue is related to an SPF failure, the reported error will usually include the acronym "SPF" or the phrase "Sender Policy Framework."

Correctly configure your SPF records - If you're the sender's email admin, make sure your domain's SPF records at your domain registrar are properly configured. Office 365 supports only one SPF record (a TXT record that defines SPF) for your domain. Include the following domain name: spf.protection.outlook.com. If you have a hybrid configuration (some mailboxes in the cloud and some mailboxes on premises) or if you're an Exchange Online Protection standalone customer, add the outbound IP address of your on-premises servers to the TXT record. To learn how, see Customize an SPF record to validate outbound email sent from your domain<https://technet.microsoft.com/library/dn789058(v=exchg.150).aspx> and External Domain Name System records for Office 365<https://support.office.com/article/External-Domain-Name-System-records-for-Office-365-c0531a6f-9e25-4f2d-ad0e-a70bfef09ac0#BKMK_SPFrecords>.

Unable to relay - If the Reported error indicates a problem with relaying (e.g. "unable to relay"), then the email server that reported the error likely isn't set up correctly to receive and relay messages from the sender's domain. This server will usually be one of your on-premises servers in a hybrid environment, a smart host email service that you're trying to route messages through, or possibly even an email hosting service you used in the past yet still have mail flow settings pointing to (e.g. your MX record at your domain registrar still points to your previous email service provider). Check Error reported by shown below to determine what domain, service, or server is reporting the error. The email server needs to be configured to either accept messages from anonymous users or to include the sending domain or IP in its list of authenticated senders. On an Exchange server, you can set this up in the server's receive connector. If it's a smart host managed by another service or partner, contact the service or partner to configure their servers to accept and relay messages from your senders. Also, work with your domain registrar to make sure your MX records are properly configured.

Contact the recipient's email admin - For some scenarios, you can fix the issue by contacting the email admin at the recipient domain to ask them to add the sender's email address or your domain to their allowed senders list, or to relax the setting that's causing the rejection.

For more information and tips for fixing this issue, see Fix email delivery issues for error code 5.7.1 in Office 365<https://go.microsoft.com/fwlink/?LinkId=389365>.

Original Message Details
Created Date:   10/16/2025 10:08:57 AM
Sender Address: [email-masked]
Recipient Address:      [email-masked]
Subject:        Kurs om hur man minskar klimatavtrycket i ROT-projekt

Error Details
Error:  550 5.7.1 XGEMAIL_0011 Command rejected
Message rejected by:    mf-inbound-eu-central-1.prod.hydra.sophos.com

Notification Details
Sent by:        MM0P280MB1074.SWEP280.PROD.OUTLOOK.COM

Message Hops
HOP     TIME (UTC)      FROM    TO      WITH    RELAY TIME
1       10/16/2025
10:08:57 AM     [127.0.0.1]     post.nuhet.se   SMTP    *
2       10/16/2025
10:08:57 AM             post.nuhet.se           *
3       10/16/2025
10:09:30 AM     post.nuhet.se   DB5PEPF00014B98.mail.protection.outlook.com     Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384)   33 sec
4       10/16/2025
10:10:10 AM     DB5PEPF00014B98.eurprd02.prod.outlook.com       DUZPR01CA0278.outlook.office365.com     Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384)   40 sec
5       10/16/2025
10:09:31 AM     DUZPR01CA0278.eurprd01.prod.exchangelabs.com    MM0P280MB1074.SWEP280.PROD.OUTLOOK.COM  Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384)    *

Original Message Headers

From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Reply-To: [email-masked]
Subject: Kurs om hur man minskar klimatavtrycket i ROT-projekt
Date: Thu, 16 Oct 2025 12:08:57 +0200
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Subject: Kurs om hur man minskar klimatavtrycket i ROT-projekt
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Date: Thu, 16 Oct 2025 12:08:57 +0200

Klimatpåverkan vid ROT-projektKurs om klimatpåverkan vid ROT-projekt med fokus på hyresgäst- och lokalanpassning – beräkningsmetodik, 
tillämpning och åtgärder för minskat klimatavtryck.