How do you edit the inbound Support email address used by customers to create incidents by sending emails to: this address?

Hi Brian,

Thanks again for your asisstance.  We are not wanting to edit the service name which in turn, renames the name of the email box.  We want to rename the domain name component after the @.

For example, we have a support email address which is: client@clientsupport.assist.com and we would like to rename it to client@companyrequests.assist.com ?  So how would we rename the domain name component of the email address? 
The service name component before the @ symbol will remain the same.

regards,

Jim