Suddenly I can't send emails through QuickBooks. It says I may not be connected to the Internet (I am). It says I may be using the wrong password (I'm not). What's up?

Hi there, @hawkmasonry.

Thank you for sharing this with me. Let's update your QuickBooks Desktop (QBDT) software to the latest release to isolate this issue. Outdated QBDT program causes unusual behavior and affects your working progress. Thus, updating it fixes the issues right away. Let me guide you how. Let me guide you how.

To update your QBDT software:

1. Go to the Help menu.
2. Select Update QuickBooks Desktop.
3. Go to the Update Now tab. 
4. Select Get Updates to start the download.
5. When the download finishes, restart QuickBooks.
6. Accept the option to install the new release when prompted.

Here's an article you can read for more details and troubleshooting steps: Fix webmail password issues in QuickBooks Desktop.

Let me also add this great resource that you can use for future guidance. This can guide you in personalizing your invoice and make it unique: Use and customize form templates.

You're always welcome to post in the Community whenever you have other queries. I'm always here to help anytime. Keep safe!