Removing a custom domain or trusted email domain
If you no longer need a custom domain or trusted email domain, you can remove it.
Before you begin
If you remove a custom domain, your end users will no longer be able to access applications or other resources using the custom domain name. If you remove a trusted email domain, you will no longer be able to send email messages from the trusted domain.
Steps
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Go to Settings > Domains.
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Locate the custom domain or trusted email domain that you want to remove.
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For the appropriate entry, click Remove.
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In the confirmation message, click Remove.