Thank you for bringing up your concern regarding the inability to edit the email that accompanies your invoices in QuickBooks, sierra.  We understand the importance of having control over the email content to maintain a professional appearance for your invoices.

I'd recommend sending feedback directly to our Product Development team. Doing so helps us improve your experience and the features of the program. 

Here's how:

1. Go to the Help menu and then select Send Feedback Online.
2. Choose Product Suggestion.
3. Add the type of feedback.
4. Type in your feature suggestion.
5. Once done, click Send Feedback.

For your visual reference, I've attached some screenshots below.

You can visit our QuickBooks Product Updates website at any time to stay informed about any updates to our program. 

Keep your post coming if you need further assistance with your emailed invoices. I'm always here to help. Have a good one.