This guide offers tips for writing acknowledgement letters to families for donations made in memory of a loved one. What do you need to include in your donation acknowledgment letter?How does your nonprofit acknowledge memorial gifts? Take a look at what makes a good thank you letter for a donation or use one of our provided templates to help get you started. A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution. Thank you for choosing to support Breakthrough T1D (formerly JDRF) to honor the memory of your loved one.