Here’s an example of how your customer will see the email.
1) WHEN CUSTOMER RECEIVE EMAIL
a) From: Your Company Name
b) Subject: Invoice Number …. from Your Company Name
2) WHEN THEY OPEN THE EMAIL. THEY WILL SEE.
a) from: Your Company Name
<quickbooks@notification.intuit.com>
THIS, THERE IS NO WAY TO CHANGE IT.
b) reply-to: your email address
c) to: customer email address
d) cc: your email address (if you’ve selected email me a copy under messages settings under gear)
e) date: Sat, Feb 18, 2017, at 8:06 AM (format)
f) subject: Invoice I-20207 from Your Company Name
g) mailed-by: e.notification.intuit.com
h) signed-by: notification.intuit.com
This sample example is from Gmail.