Step 1: ADDA Admin >> Dashboard >> Income Tracker >> Notifications.
Step 2: Scroll down and Check the checkbox for “Send a Flat's Open Invoices by email as and when posted” & "Send Receipts by email as and when posted".
Step 3: Save Changes.
PS: If you want to verify the invoices before sending as you are generating the invoices for the first time, do not enable this.
You can send the invoice after the verification by following the below link: