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?Donor Address (to receive your donation acknowledgement receipt). When you make a donation in honor of someone, it can take up to four weeks for your tribute notification letter to arrive in your gift recipient's mailbox. Pay tribute to loved ones or make memorial donations. Make a donation in someone's name and Komen will mail a tribute card to them about the donation. This guide will cover everything from nonprofit memorial donation thank you letters to keeping track of memorial donations and how to notify families.