Payment Receipts can be emailed either at the time of receiving payment or retrospectively via the Customer Overview screen.
Email Receipt when entering a payment
From the Receive Payment screen, click the Save & Receipt button locate towards the bottom-right.
Click the Email button located at the top-right to email the customer.
Email Receipt retrospectively
Go to the Sales/Hire > Customer Overview screen.
Click the Reports tab.
Click the Receipt sub-heading to expand this section.
Choose a payment from the Search for Payment dropdown, then click Preview.
Click the Email button located at the top-right to email the customer.