I'd like to help and make sure you can send an invoice through email in your QuickBooks Desktop (QDBT). Can you specify what email provider you're using or any error message you receive? Additional details are appreciated.
In the meantime, let's perform some troubleshooting steps to isolate this. To start, let's make sure that your QBDT is updated to the latest release. Here's how:
Go to the Help menu and click Update QuickBooksDesktop.
On the Options tab, click Mark All, then Save.
Go to the Update Now tab and mark the Reset Update box and click Get Updates.
Once done, close and reopen your QBDT, then create a test invoice and send it to your email to double-check. If the issue persists, you can check this great article for further guidance: Error: QuickBooks is unable to send your email to Outlook
You might also want to check this article for reference in case you want to customize your invoice in QBDT: Use and customize form templates
Let me know if you have other concerns or questions. You're always welcome to post in the Community anytime.
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