Subject: Undeliverable: Installationstekniska åtgärder som sparar energi – gå kursen!

From: <[email-masked]>
Date: Fri, 19 Sep 2025 12:44:33 +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: GV3P280MB0873.SWEP280.PROD.OUTLOOK.COM
Receiving server: GV3P280MB0873.SWEP280.PROD.OUTLOOK.COM

[email-masked]
9/19/2025 12:44:33 PM - Server at GV3P280MB0873.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.)'
9/19/2025 12:36:58 PM - Server at byggtjanst.se (52.101.73.26) 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=52.101.73.26:25] [SmtpSecurity=-1;-1] [GV2PEPF00000019.SWEP280.PROD.OUTLOOK.COM 2025-09-19T12:36:59.074Z 08DDF70A8E1FD7B6](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: Installationstekniska =?utf-8?Q?=C3=A5tg=C3=A4rder?= som sparar
 energi =?utf-8?Q?=E2=80=93_g=C3=A5?= kursen!
Date: Thu, 18 Sep 2025 12:10:47 +0200
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Subject: Installationstekniska åtgärder som sparar energi – gå kursen!
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Date: Thu, 18 Sep 2025 12:10:47 +0200

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