Log on to the enterprise mailbox management page.
Click Domain Management > Change Domain Name and follow the prompts.
If you want to keep your original domain name and add a new one to use as a mailbox suffix, you can add a domain alias. For more information, see How to add multiple domains and domain aliases.
If the issue persists, click Feedback in the lower-right corner of this document. Describe the issue and provide your email address so we can contact you.
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