I support your position here, @Ptaylor1.

Generally, QuickBooks can change the default email by setting it up in the Preferences page. It seems, you've already tried the steps provided by my colleagues on this thread.

Since I won't be able to pull up your account and navigate in a public forum, I'd suggest reaching out to our QuickBooks Team. This way, they can check this further and escalate the issue to the appropriate channel. 

I'll be keeping an eye out for your response and look forward to getting this resolved for you. Take care.