Thank you for posting here in the Community, coastalkellie.

Allow me to share how you can email a bill payment details in QuickBooks Online.

The option to email a bill payment information directly to a vendor is currently unavailable in QuickBooks Online. We can, however, save a PDF file of the bill payment and include the remittance details in the Memo field so that you can manually email it to your vendor.

Before that, make sure you recorded a bill payment, you can use this as reference: Enter and manage bills and bill payments in QuickBooks Online.

After that, add the payment remittance info and save it as a PDF.

Like this:

1. Go to Get paid & pay or Expense menu, then Vendors.
2. Click the vendor's name.
3. Select to open the bill payment, then enter the remittance details in the Memo field.
4. Once done, click on Print at the bottom.
   
    
5. Hit the Download icon to save a PDF file.
   

Alternatively, you can look for any third-party application that can be integrated with QuickBooks Online.

Please let me know if you require any additional assistance or have any questions about bills or payments. Have a great day!