I appreciate you for trying the steps shared by my colleagues, ddiguru1.

After you've upgraded your file, the system will use the default settings. We'll have to set up your email again. I'll show you how:

1. Click QuickBooks, and then select Preferences.
2. Select the Email icon.
3. In the Send Emails Using section, select Custom.
4. Select the + button.
5. Add an account name, and then add the settings from your email provider.

Once set up, you'll find the email address listed in the From field of your message and choose an account from there.

Afterward, let's try to check if you're now able to send an email.

Feel free to browse this article if you want to customize the sales form before sending it: Use and customize form templates.

There you have it, ddiguru1. Stay safe!