The Company email is the email address where all billing communication will be emailed. To update it, go to your Team > Billing > Invoices > Edit billing information.
Note: This action can only be performed by a team member who has the Billing role or the Super Admin role. If no one in your Postman team has either the Billing or the Super Admin role, have the Admin assign the Billing role to themselves or another team member from the Manage Team page.