Yes, you will need to add the domain you want to use via the control panel.
Please follow the steps listed below to add a domain:
1. Login into the Control Panel and click on ‘Advanced Administration’.
2. Click on ‘Company Info’.
3. Check ‘Enable Exchange’ and enter the new domain and click on ‘Add Domain’.
4. Click on the ‘Update’ button at the bottom of the page. This new domain will be available in the ‘Drop Down List’ when you try to add a new user or open ‘User Info’.
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