Click on Invoice and Payments from main menu.

Select a single or multiple checkboxes, to send a copy of the Unpaid Invoices to the customer.

Enter the remarks and click on "Send Invoice". (Remarks are optional)

Click on any record should load corresponding lease details(Centralized Lease Page)

After the click you will see a pop-up with email status as success, however if there is no email available you would find the status as failed.