Hi
I use MYOB essentials and an essential item has been missed. Its not often that I do this but I find it more with older people that they do not have email and I have to create and print an invoice and hand write the envelope or use Excel where I have a printing template setup.
When you press print on the invoice you should have the option to print an envelope which would also print the return addrerss and logo on the front of it.
"Printing envelopes from with in an invoice"