Thank you for reaching out to us, TS34.

I'll be glad to help you with sending emailing invoices.

To clarify, did you receive any error messages when trying to send those invoices? Also, may I know what's your email provider? Any additional details will be much appreciated.

Let's perform some troubleshooting steps that can help us isolate this. To start off, make sure that your QBDT is updated to the latest version. Here's how:

1. Go to the Help menu

2. Select the Update QuickBooks Desktop on the drop-down.
3. Go to the Options tab,

4. Click Mark All, then Save.
5. Click Update Now.

6  Select the Reset Update tab.

7 .Click Get Updates.

Once done, kindly close and reopen QuickBooks Desktop. For more details, you can also check this article: Update QuickBooks Desktop to the latest release.

 Create a test invoice and resend it to your email to double-check. If the issue persists, check out this article for further guidance: Connect your email to QuickBooks Desktop

You can also check on this article: Fix Error: Could not connect to the email server for more information about emailing invoices.

We're always here in the Community to help if you have other questions related to Emailing invoices in QuickBooks. Stay safe!