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Welcome to the Community, cwagner898.
You've come to the right place for assistance with QuickBooks. I'd be glad to help out with setting up your company email to send invoices.
This would need to be done through your Yahoo account. I recommend giving the following steps a try:
1. Login into your Yahoo account as the administrator.
2. Go to your Yahoo Account Security page.
3. Turn on the two-step verification and allow apps that use less secure sign in features.
4. Go back into QuickBooks and email yourself a test invoice.
The following article offers additional details on this process: https://quickbooks.intuit.com/learn-support/en-us/manage-passwords/fix-webmail-password-issues-in-qu....
Please let me know if this works for you. I'm only a post or comment away if you have any other questions.