Facilty to ask for delivery and read receipts after emailing invoices, payslips etc... Merged

Reckon one urgently needs a facility to ask for delivery and read receipts after emailing invoices to customers. There appears to be issues with customers not receiving invoices sent from reckon one and according to the system the email has been sent. After this there is no way of checking that the email gets delivered or read. After the due dates and invoices have not been paid it is then necessary to phone the customer to ask the problem. We then find that they have not received it. This then creates extensive work load to print out invoices then scan them and resend via a system that has read receipt facility. It appears that some businesses have very high security for emails and the emails from reckon one go straight into spam and others just simply can not find them at all.

** Similar requests have been made for payslips so bundling with this idea - Admin.