If you want to check which of your customers will receive a reminder for your appointment, you can use the reminder overview.
Overall Overview
In the "Appointment confirmations & reminders" module you will find an overview that shows you how many of your appointments in the last and next 7 days contained a reminder.

Detailed Overview
In addition to the pie charts, the number of appointments without a reminder is linked. By clicking on the blue link you will get to the detailed overview.
In the detailed overview of upcoming appointments, you can quickly and easily set the checkboxes for missing reminders.
