Good day, cbcservice1514.
You can update the email address from each of the company files Account and Settings one at a time. I'll walk you through the steps below:
- Go to the Gear icon.
- Choose Account and Settings.
- Click the Company tab.
- From the Contact info section, update the email address from the Company email field.
- Click Save, then Done.
I've got some article that might help you with sending invoices and estimates in QuickBooks Online (QBO):
The Community is always open for any queries you may have. Wish you all the best of luck.