Custom email labelling

Custom email labelling

New to zoho. I know how to add a user for a specific domain and create a custom email account.
One email created: sales@domainname.com

An email was sent to another mail account and saw it listed in that inbox with other mail
Actual result of inbox listing: Sales
Expected result of inbox listing: Domainname Sales

I checked for email labeling but found nothing?
How can the actual result be changed to an expected one?