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Remove custom domain checklist

SenhorDolas 1,271 Reputation points
2021-08-13T11:36:46.183+00:00

Hi
I am on hybrid setup here and I need to remove a secondary domain (not required anymore).
In EOP my default domain is contoso.com and Online is contoso365.onmicrosoft.com
The domain to remove is contosohats.com (in EOP is authoritive)
I have removed and placed on hold all mailboxes/secondary SMTP and DL's with smtp: contosohats.com
The DNS is set to Azure (MX records, TXT and CNAME for Autodiscovery)

To remove the domain contosohats.com is it as simple as delete from EOP, Online, Azure > Custom domain names?
Are there any considerations I should be aware of?
Will the mailboxes archived/held still be able to be searched in?

Thanks M

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. SenhorDolas 1,271 Reputation points
    2021-08-16T11:55:44.947+00:00

    @Xzsssss
    Thanks for coming back to me.
    I was wondering if there are any other tasks associated with deleting a custom domain.
    If I have covered them all then thanks for your help.

    1 person found this answer helpful.
  2. Xzsssss 8,861 Reputation points Microsoft Vendor
    2021-08-16T01:31:31.99+00:00

    Hi @SenhorDolas ,

    Please set one of the other domains as the default domain. So you could directly delete the contosohats.com domain, you can delete it in M365 Admin Center.

    Will the mailboxes archived/held still be able to be searched in?

    Yes if you changed the default domain to the existing ones.

    Best regards,
    Lou

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