On the _______day of ______ in the year_____, before me, the undersigned notary public, personally appeared. Your acknowledgment receipt should contain the names of the issuing party and the person receiving the document.What do you need to include in your donation acknowledgment letter? I can confirm that we have received your email, and I wanted to acknowledge receipt. Thank you for sending me the (invoice, report, etc.). How do you fill out an acknowledgment letter? How do you fill out an acknowledgment letter? There is no official IRS form that the exempt organization has to complete. When does the nonprofit need to send the written acknowledgment letter to donors? RE: County of Suffolk v.