Set up an automation rule under Admin > Workflows > Automations > Ticket creation tab > New rule to add a specific tag when a particular email address is in cc of the ticket.


Conditions: 

In Ticket > If Ticket CC > is > sara@acmecorp.com


Actions: 

Add tag > CC_tag


Go to the Tickets list page, filter out tickets with tag 'CC_tag', to display all tickets with that particular email address in CC.