I appreciate all the efforts you've exhausted just to get this working, lbulmer.

Currently, we have an open investigation about this email issue. Rest assured, our engineers are actively working to get this rectified as soon as possible. 

For now, I'd recommend getting in touch with our Customer Care Team so your account details will be added to the list of affected users. Here's how to connect with us:

1. Open QuickBooks.
2. Go to the Help menu, then select QuickBooks Desktop Help.
3. Enter any keyword, then press Enter.
4. Click Contact Us at the bottom.
5. Enter "Changes in the body of the email when sending through Outlook in Quickbooks Desktop is not reflecting in the received email." in the description box.
6. Select Let's talk or Continue, then choose Start a chat or Get a callback.

Once you're in, please provide this investigation number to our representative for a faster transaction: INV-58175.

In the meantime, you'll want to consider setting up webmail in QuickBooks company. You can utilize this option in sending the transactions that require a manual edit prior to emailing.

I'm also adding these articles to help resolve common template issues in QBDT:

• Fix custom email template issues
• Fix issues when you use and customize templates

Don't hesitate to visit us again here if you have any other concerns or follow-up questions. The Community always has your back.