If you have multiple domain names linked to your cPanel account as 'alias' domains, you can ensure they are all redirected to the main account domain by enabling the following within cPanel...
- Login to cPanel
- Go to 'Nginx Cluster Control' section and select 'CLOUDNS'
- Select the domain you wish to enable the protection for from the dropdown list and click 'Configure'
- Select 'Application Settings'
- Enable the 'redirect_aliases' option
- Click 'Submit'