Subject: Undeliverable: Kurs om tappvattensystem - energieffektivisering och legionella

From: <[email-masked]>
Date: Thu, 8 Jan 2026 07:01:58 +0000

DB1PEPF000509F1.mail.protection.outlook.com rejected your message to the following email addresses:

[email-masked]<mailto:[email-masked]>
Your message couldn't be delivered because there is a partner connector configured that matched the message's recipient domain. The connector had either the RestrictDomainsToIPAddresses or RestrictDomainsToCertificate set.
For more information about this issue, see DSN code 5.7.1 in Exchange Online - Office 365<https://go.microsoft.com/fwlink/?LinkId=389365>.

DB1PEPF000509F1.mail.protection.outlook.com gave this error:
TenantInboundAttribution; Rejecting. Recipient has a partner connector with RestrictDomainsToIPAddresses or RestrictDomainsToCertificate set. Connector ID: 07e5b628-4478-4c6a-aa87-bfe372b53273. [DB1PEPF000509F1.eurprd03.prod.outlook.com 2026-01-08T07:01:58.877Z 08DE4E44CAB64C85]

Diagnostic information for administrators:

Generating server: GV3P280MB0855.SWEP280.PROD.OUTLOOK.COM

[email-masked]
DB1PEPF000509F1.mail.protection.outlook.com
Remote server returned '550 5.7.51 TenantInboundAttribution; Rejecting. Recipient has a partner connector with RestrictDomainsToIPAddresses or RestrictDomainsToCertificate set. Connector ID: 07e5b628-4478-4c6a-aa87-bfe372b53273. [DB1PEPF000509F1.eurprd03.prod.outlook.com 2026-01-08T07:01:58.877Z 08DE4E44CAB64C85]'

Original message headers:

Authentication-Results-Original: in41o.electric.net;    iprev=pass
 (post.nuhet.se) smtp.remote-ip=85.118.203.81;  spf=pass
 smtp.mailfrom=post.nuhet.se;   dmarc=skipped
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Reply-To: [email-masked]
Subject: Kurs om tappvattensystem - energieffektivisering och legionella
Date: Thu, 08 Jan 2026 08:01:41 +0100
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Subject: Kurs om tappvattensystem - energieffektivisering och legionella
From: Svensk Energiutbildning <[email-masked]>
To: [email-masked]
Date: Thu, 08 Jan 2026 08:01:41 +0100

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