Although Intuit see to think their branding is more important that our own you can send invoices with their branding on the email. You have to see to send email with PDF attached it should then attached the invoice as a pdf to a blank email.

btw don't even thinking about asking why you can't put your company logos on statement or purchase orders, becauser you can't. Don't even ask for it as they even admitted it's been on eof the most requested features for YEARS and they've still not fixed the problem.