This problem has been going on since February - so many posts I can't keep count.  Works one day and the next you get a page full of delivery errors. 

You don't know which email failed the one to your customer or the copy you send yourself. 

Customers are not paying because they haven't received email and others have received multiple copies.  

Its unbelievable that a company as large as Intuit has not fixed this problem when it has been on going for 6 months. 

So many posts on this issue I can't keep track of them all yet still not fixed.