It's possible to setup email reminders when your invoices are overdue.

From the Revenues page, in the list, you will find the quick action "Send reminder" when hovering an overdue invoice.

From the Settings page, select "Invoice reminders".

It's possible to pick the number of days after the invoice becomes overdue, to send the email automatically (you can send several reminders).

You can also edit the email template, and add variable information such as invoice number, client name, invoice amount, invoice due date.