By default, notifications for all activity (donations, volunteer signups, registrations, etc.) will go to the Admin of the Flipcause account.
Users with the proper permissions for your Flipcause account can change the Admin for your account by going to Settings > Profile & Login Settings > Your Profile.
You can also control the notification settings per campaign by going to Campaigns > Edit This Campaign > Receipt Settings > Internal Notification Settings and add the emails you wish to be notified to the list, separated by a comma.
Every email you add to the notifications for the campaign will then receive emails whenever activity takes place.