Subject: Undeliverable: Lär dig energieffektivisera byggnadens installationssystem

From: <[email-masked]>
Date: Tue, 7 Oct 2025 06:04:07 +0000

Delivery has failed to these recipients or groups:

[email-masked]<mailto:[email-masked]>
Your message wasn't delivered. Despite repeated attempts to deliver your message, a connection to the remote server couldn't be made.

Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that your email system is unable to connecto their email system. Give them the error details shown below. It's likely that the recipient's email admin is the only one who can fix this problem.

For more information and tips to fix this issue see this article: https://go.microsoft.com/fwlink/?LinkId=389361.

Diagnostic information for administrators:

Generating server: MM0P280MB0630.SWEP280.PROD.OUTLOOK.COM
Receiving server: MM0P280MB0630.SWEP280.PROD.OUTLOOK.COM

[email-masked]
10/7/2025 6:04:07 AM - Server at MM0P280MB0630.SWEP280.PROD.OUTLOOK.COM returned '550 5.4.317 Message expired, cannot connect to remote server(SubjectMismatch. Expected Subject: *.byggtjanst.se. Presented Subject: CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US. Thumbprint: F2882262EDFEB841F332A84FD8FBB1B06BBFC393.)'
10/7/2025 5:54:07 AM - Server at byggtjanst.se (52.101.73.19) returned '450 4.4.317 Cannot establish session with remote server [Message=SubjectMismatch. Expected Subject: *.byggtjanst.se. Presented Subject: CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US. Thumbprint: F2882262EDFEB841F332A84FD8FBB1B06BBFC393.] [LastAttemptedServerName=byggtjanst.se] [LastAttemptedIP=52.101.73.19:25] [SmtpSecurity=-1;-1] [MM1PEPF00001514.SWEP280.PROD.OUTLOOK.COM 2025-10-07T05:54:07.567Z 08DE0521AD58AEA7](SubjectMismatch. Expected Subject: *.byggtjanst.se. Presented Subject: CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US. Thumbprint: F2882262EDFEB841F332A84FD8FBB1B06BBFC393.)'

Original message headers:

From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Reply-To: [email-masked]
Subject: Lär dig energieffektivisera byggnadens
 installationssystem
Date: Mon, 06 Oct 2025 08:01:29 +0200
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Subject: Lär dig energieffektivisera byggnadens installationssystem
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Date: Mon, 06 Oct 2025 08:01:29 +0200

Installationsteknisk energieffektiviseringKurs om hur man driftoptimerar och energieffektiviserar byggnader 
med installationstekniska åtgärder.