Hello there, Carolyn1.

The email address under Manage Your Account in the My Account section is used for your QuickBooks account. This is not the information used when you email invoices or estimates to your customers. 

You'll want to update the email address in the preferences instead. But, before doing so, let's make sure that your QuickBooks Desktop is updated to the latest release.

Then, follow these steps:

1. Click Edit located at the top, and select Preferences.
2. In the Preferences window, click Send Forms on the left panel.
3. Click the Add button, and then add the email address.
4. Choose the Email Provider, and select OK.
5. Once done, click OK again.

Here's a sample screenshot for reference:

If you're getting the same result, please contact our Customer Care Team to further check the settings.

Here's how you can reach out to us:

1. Click Help located at the top.
2. Choose QuickBooks Desktop Help.
3. Enter a brief description of your issue and click Continue.
4. You can choose Message an Agent or Talk to a Specialist.

Don't hesitate to visit us here if you have other questions or concerns. Thanks.