Departments & Email
Departments route tickets to teams. Email accounts (when enabled) pull mail into tickets so customers can write to a mailbox instead of only using the portal.
Departments
Open Departments (email-accounts permission). Create departments that match how you staff support (Billing, Technical).
Mailbox fetch
Connect department mailboxes when department email fetch is on the plan. Keep credentials in the product, not in tickets. Test with a throwaway address before you publish a public support email.