Thanks for checking in on this thread. I can see this is an important feature to you and I can appreciate how being able to send a single email with information for multiple transactions within it would be great for not only you, but your customers.
At QuickBooks, our goal is to constantly develop the program to meet the needs of business owners and I'm happy to share that the ability to send multiple transactions in a single email was added as a feature to the 2020 version of the program! Here are the steps for how it's done.
I pulled those instructions from the Email sales forms in QuickBooks Desktop article. Feel free to bookmark that one if you find it helpful.
Your feedback works, so please never hesitate to submit your ideas to us by going to the Help menu in QuickBooks Desktop and choosing Send Feedback Online.
Let me know if you have questions!