We can perform some troubleshooting to fix the issue you're having with webmail authorization, James. 

Firstly, let's update QuickBooks to the latest release to ensure that everything is up-to-date.

Here’s how:

1. Go to the Update to the Latest Release page.
2. Select your QuickBooks product and version, then click Search.
3. Click the Get the latest updates link, then Save/Save File to download the update.
4. When the download completes, double-click to install the update. You may need to restart Windows after the installation finishes.

After updating QuickBooks, let's check the settings in the webmail preferences by following these steps:

1. Go to the Edit menu and select Preferences.
2. On the left pane, select Send Forms.
3. Under My Preferences, select the email account you are using and click Edit.
4. In the Edit Email Info screen, go to the SMTP Server Details section and set the server name and port to your email provider settings.

Additionally, please refer to this article to see the list of SMTP servers and Ports: Set up email service.

Moreover, you can check out this article once you encounter any error messages when sending invoices: Could not connect to the email server.

If you need to record an invoice payment, please refer to this article for guidance: Record an invoice payment.

Let me know if you require additional help with the webmail authorization or QuickBooks. Stay safe.