First, to begin the letter, start with a warm greeting and mention your sponsor's name. Don't jump right into the letter.Nonprofit sponsorships are common but the correct way to provide acknowledgements for nonprofit event sponsorship is not well understood. What do you need to include in your donation acknowledgment letter? It is my great pleasure to acknowledge your magnificent Hewlett-matched pledge to the University, and to the Graduate School of Public Policy in particular. For requests for a proclamation or ceremonial letter, please contact a member of the Board of Commissioners to request their sponsorship. We intend to acknowledge you for your sponsorship at the event's opening and closing ceremonies, ensuring your brand is promoted prominently. Gift acknowledgement letters are important for two reasons. First, they provide proof so donors can claim a U.S. tax exemption.