When does a reminder email go out?

Reminder emails do NOT go out by default. To turn on reminder emails, add a reminder email message first. However, once a reminder email is added, we do additional checks to prevent sending unnecessary reminder emails. In particular, we do NOT send a reminder email if one of these conditions is true:

• User's email is blank
• Measurement is present
• Reminder email has already been sent
• Registration has not been completed (registration_completed_at flag is not set)
• If user has an appointment and the appointment has passed
• Event has "limit_reminder_email_to_appointments" set to true (see below)

 If the above is false, then a reminder email will go out.