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e.froehlich@cbs.de
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Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their domain isn't properly registered at their domain registrar. 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.







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Generating server: PA1PPF442736232.eurprd02.prod.outlook.com

e.froehlich@cbs.de
Remote server returned '550 5.4.310 DNS domain mx1.cbs.de,mx2.cbs.de does not exist [Message=InfoDomainNonexistent] [LastAttemptedServerName=mx1.cbs.de,mx2.cbs.de] [DB1PEPF00052755.eurprd03.prod.outlook.com 2025-07-06T10:59:10.325Z 08DDBB635E62492D]'

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