Hello @BlakeTaylor,
As of the moment, there isn't an integrated way of your customizing your emails in QuickBooks.
In the meantime, consider contacting the support of your bill provider. From there, a specialist can help you customize the format and content of your emails when sending bills to your vendors.
For other methods of expenses that you can enter for all purchases you made to your vendors, here's an article you can read for the steps: What is the difference between bills, checks, and expenses?
If there's anything else that I can you with, please let me know by leaving a comment below. I'll be here to lend a hand.
