Hi there, @ben8.
Good to see you here in the QuickBooks Community. Allow me to provide some information about a collection letter.
Currently, QuickBooks Online (QBO) doesn't have an option to import a collection letter and print/mail it using the customer's batch icon. I can see how this feature would be beneficial to your business, I encourage you to send feedback directly to our Product Developer for future updates.
Here's how you can send feedback:
- Click the Gear Icon.
- Select Feedback.
- Click Next and choose Feedback under Category option.
- Select Save.
For future reference, you can check these articles: How to email or print an invoice.
Please know that your always welcome to post if you have any other questions. Wishing you and your business continued success.