Office 365 – Can not receive mails with ownen Mail Domain

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After working with some test accounts in Microsoft Office 365 I realized I could not send mails to my own domain. In the Office 365 control panel everything looked right and the domain was active. I also added the mail addresses to the user accounts.

The error I got back was:

Final-Recipient: rfc822;[email protected] Action: failed Status: 5.4.1 Diagnostic-Code: smtp;550 5.4.1 Relay Access Denied

After creating a support ticket with the Microsoft Office 365 the support called me and checked my account. Now the problem was I already added the domain to another Office 356 account. So the Forefront had the domain added as duplicated domain.

 Office 365 Forefront

 You can check the status of your domains in Forefront by clicking on the Exchange Online Administration (Manage) like on the Overview site. Now you can click

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Now on your Exchange Online Management page click on Mail Control on the left site.

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On the right site you can click on Configure IP safelisting, perimeter message tracing, and e-mail policies.

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Now in the Domain tap you can check if you have a domain entry whichs starts with “duplicated…..”. If you have a entry like that you have to open a support ticket and the Forefront Online Team will remove the entry from your Account and you have to add the Domain again.

By the way this was the first time I used the Microsoft Support for Office 365 and it was a really good experience. Microsoft really offers a great Service here with fast and qualified support.