What do you need to include in your donation acknowledgment letter? This guide offers tips for writing acknowledgement letters to families for donations made in memory of a loved one.1. Personalize the message. Just like any well-written donor thank you letter, your memorial donation gratitude notes should be personalized to each donor. Your letter doesn't need to be long. However, donors like to be thanked, and they want to know something about you personally as well as your educational goals. A donation acknowledgment letter is a type of donor letter that you send to donors to document their charitable gifts and donations. In-Kind Donation Form. Donor Name (Company or Individual). Please indicate the name of the individual(s) or family you wish to honor.