this is terrible, i can't believe that i was able to send invoices using my company email last year, and ever since this year update I can't.

I expended 2.5 hours trying to make this email issue work with your (QB) customer service, and we were never able to make it work.  I work with my email provider, and we couldn't make work either.

I notice that when I email my customer from QB, the first thing it comes up is QB company name, and the sender is "Intuit E-Commerce service".   I didn't authorized QB to represent my company to my customers.

And the bottom of the email, QB advertise, 

this is not the correct way to make business.