What do you need to include in your donation acknowledgment letter? What are the requirements for donation acknowledgment?How do you write a basic donor acknowledgment letter? A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution. This file provides various templates for acknowledging charitable donations. It includes sample texts for different donation amounts and types. How to fill out the Massachusetts All-Purpose Acknowledgment Form? 1. Identify the county where notarization will occur. 2. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes.