1. Open the Invoices menu.
2. In the Invoices module, select the Settings -> Account settings menu.
3. Open the Invoice sending section.
4. Configure the Invoice sending settings.
5. For Sending an invoice by e-mail set the new content E-mail subject.
6. For Sending an invoice by e-mail, set your own e-mail template and change the content of the message.
7. For Sending an invoice by e-mail select Attach PDF.
8. For Unpaid invoice set the new content E-mail subject.
9. For Unpaid invoice, set your own e-mail template and change the content of the message.
10. For Unpaid invoice select Attach PDF.
11. For Unpaid invoice set Automatic reminders settings in order to send email about unpaid invoices automatically.
12. Configure the E-mail Footer.
13. Save changes.
