These options are controlled on the billings tab of each file, defaults are set in the System File Default Tab
Emailing Invoices
When Emailing invoices through either the Debtor Invoice Manager or from the Financial Tab within a matter, Contacts can be added to the Email Options section of the Billing tab that have the Invoices will now be listed
Emailing Reminder Notices
The same option will also occur when emailing reminder notices through the Reminder Notice List section of FilePro