Subject: Undeliverable: Lär dig hantera dagsljuskraven i Boverkets nya byggregler

From: <[email-masked]>
Date: Wed, 14 Jan 2026 07:05:57 +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: MM0P280MB0008.SWEP280.PROD.OUTLOOK.COM
Receiving server: MM0P280MB0008.SWEP280.PROD.OUTLOOK.COM

[email-masked]
1/14/2026 7:05:57 AM - Server at MM0P280MB0008.SWEP280.PROD.OUTLOOK.COM returned '550 5.4.317 Message expired, cannot connect to remote server(451 5.7.3 STARTTLS is required to send mail)'
1/14/2026 6:55:57 AM - Server at synk.fargelanda.se (194.17.154.25) returned '450 4.4.317 Cannot establish session with remote server [Message=451 5.7.3 STARTTLS is required to send mail] [LastAttemptedServerName=synk.fargelanda.se] [LastAttemptedIP=194.17.154.25:25] [SmtpSecurity=-2;-2] [MM1PEPF00001517.SWEP280.PROD.OUTLOOK.COM 2026-01-14T06:55:57.107Z 08DE4E5B07BDBA57](451 5.7.3 STARTTLS is required to send mail)'

Original message headers:

From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Reply-To: [email-masked]
Subject: Lär dig hantera dagsljuskraven i Boverkets nya
 byggregler
Date: Tue, 13 Jan 2026 08:03:40 +0100
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Subject: Lär dig hantera dagsljuskraven i Boverkets nya byggregler
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Date: Tue, 13 Jan 2026 08:03:40 +0100

Dagsljuskraven i Boverkets nya byggreglerKurs om hur man hanterar de nya kraven på dagsljus i byggnader och 
vad de innebär för tillsyn, byggnadsutformning och användbarhet.