Hello, @rlambert0412.

I understand that having the purchasing email and bill pay email to a vendor would be of great convenience for you and your business. However, it's currently unavailable in QuickBooks Online.

With this, I recommend sending feedback to our product engineers. This way, they can consider adding this feature in future updates.

Here's how:
 

1. Click the Gear icon in the upper-right corner.
2. Select Feedback under Profile.
3. Share your feedback.
4. Click Next to submit.

Additionally, you can read through this article related to Bill Pay: Learn about QuickBooks Bill Pay

 
Let me know if you have further questions about tracking your expenses. I'm just a reply away. Keep safe!