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?A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution. This guide will cover everything from nonprofit memorial donation thank you letters to keeping track of memorial donations and how to notify families. Thank you so much for your donation in memory of John Smith. 1. Personalize the message. Just like any well-written donor thank you letter, your memorial donation gratitude notes should be personalized to each donor. Check out our gift acknowledgement selection for the very best in unique or custom, handmade pieces from our digital prints shops.