What do you need to include in your donation acknowledgment letter? A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution.They present an opportunity to thank donors in a. What to include in donor acknowledgment letters? Want to learn how to write and structure donor acknowledgment letters? Check out these tips and sample letters to make a greater impact. You will need to indicate that your gift is to support the Bexar County VMA Scholarship Fund, or indicate account number 04-33058 in the "Gift Fund Number" box. Here's what nonprofits need to know.