Thanks for clarifying your concern, @shueck. I understand that you wanted to use the business email instead of the personal email account. 

As an additional insight, QuickBooks will only depend on what is being set as the default email account from Outlook. 

You can find the best explanation in this article as to where Outlook finds and uses your personal email address: Change the account used to send email messages. 

I'd suggest you follow the steps in that article to change your default email account to your preferred business email account. Then, check the box to Always use the default account when composing new messages so QuickBooks will follow it. 

Regarding your concern @RSWarehousing, you'll need to add another email account to add the From button manually. Please refer to this topic: Why is the From button is missing? from the same article I shared above.

Let me know if you have additional questions. I'd be delighted to assist you some more.