Delivery has failed to these recipients or groups:

j.tangermann@hfk-bremen.de
 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: DU5PR08MB10776.eurprd08.prod.outlook.com
Receiving server: DU5PR08MB10776.eurprd08.prod.outlook.com

j.tangermann@hfk-bremen.de
7/6/2025 11:03:02 PM - Server at DU5PR08MB10776.eurprd08.prod.outlook.com returned '550 5.4.317 Message expired, cannot connect to remote server(SubjectMismatch Expected Subject: mail.hfk-bremen.de. Presented Subject: CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US. Thumbprint: B19C121E37CD29D820D740BF19A6E464F3D29250.)'
7/6/2025 10:53:02 PM - Server at hfk-bremen.de (52.101.73.6) returned '450 4.4.317 Cannot connect to remote server [Message=SubjectMismatch Expected Subject: mail.hfk-bremen.de. Presented Subject: CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US. Thumbprint: B19C121E37CD29D820D740BF19A6E464F3D29250.] [LastAttemptedServerName=hfk-bremen.de] [LastAttemptedIP=52.101.73.6:25] [SmtpSecurity=-1;-1] [PA1PEPF000F091D.eurprd04.prod.outlook.com 2025-07-06T22:53:02.813Z 08DDB69AA74C04C8](SubjectMismatch Expected Subject: mail.hfk-bremen.de. Presented Subject: CN=mail.protection.outlook.com, O=Microsoft Corporation, L=Redmond, S=Washington, C=US. Thumbprint: B19C121E37CD29D820D740BF19A6E464F3D29250.)'

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Date: Sun, 6 Jul 2025 12:57:34 +0200
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