Every month your account is allowed so many emails to be sent once your artwork is created. At the beginning of the next month your account is refreshed and ready to send out emails again. If you have a 2k, 20k, or 100k list NAIO Labs will schedule your email campaign for you in advance so you can rest assured that your campaign will automatically run itself. Therefore, if you have a limit of 100,000 emails per month and your list is 20,000; you can send out your email flyer 5 times that month. And of course if you are in need of sending more emails, NAIO Labs will make it happen. Once you have reached your email limit, NAIO simply charges a per email sent fee, ranging from $0.001 - $0.005