Update your DNS to redirect the chosen aliased URL (e.g.:
customercase.comusing a CNAME record.
Ensure that you have correctly specified your subdomain mapping to Customer Case. The record should look like:
Wait until the registrar propagates the new DNS address
feedback 14400 IN CNAME customercase.com
Each registrar has its own method of adding CNAME records. It may take several hours for your DNS changes to take effect.
Setting Custom Domain Name