Good to see you here in the Community, agrozier.

Let me lend a helping hand with sending invoices via email in QuickBooks Desktop.

There are a few possible reasons why this is happening:

• The email preference being set incorrectly.
• A damaged QuickBooks installation.
• Domain admin was blocked.
• Account security settings from your email provider.

To better isolate the issue, as an initial step, let's make sure your QuickBooks Desktop software is in its latest release.  Once done, you can check the web mail's settings in the preferences.

Here's how:

1. At the top menu bar, click Edit.
2. Choose Preferences.
3. Click Send Forms on the left panel.
4. Under My Preferences tab, select the email account you're using.
5. Click Edit.
6. Mark the SSL box, or just select Default.
7. In the Server Name field, make sure the server name matches your email provider's settings.

You can check out these recommended articles for more details:

• Set up an email service.
• Error: Could not connect to the email server.
• Update to the latest release of QuickBooks Desktop.

Should you need more help with sending invoices via email, please let me know. I'm more than willing to lend a hand.