This solved the issue. Thanks. A bit more info to help others:
Open Outlook Desktop
Select FILE
select ACCOUNT SETTING dropdown
select ACCOUNT SETTINGS from the list - a popup screen should appear
There multiple tabs: Email, Data Files, RSS Feeds, SharePoint Lists, Internet Calendars, Published Calendars, Address Book - Select the second tab Data Files
Choose the email address you want Quickbooks to send from as default.
Select the "Set as Default" button above the list.
Close
Then test the forms email in Quickbooks. It should default to the selected account. The default Data Files account can change when you remove and/or add a new email account. Hope this helps some. It helped me solve this issue!
