(Personalized Seal). Thank you for you interest in the University of Texas Health Science Center at Houston. Sincerely,. Name. Title. Enclosure.Fill out, sign, and affix your official seal to the Notary certificate. The wording requirements for acknowledgment certificates vary from state to state. A good donor acknowledgment letter is both a transaction record and a donor engagement opportunity. Here's how to write one. Check out our letter of acknowledgement template selection for the very best in unique or custom, handmade pieces from our templates shops. An acknowledgment receipt is a written document that confirms the receipt of goods, services, payments, or documents. An Acknowledgment of Paternity (AOP) is a legal document that allows parents who aren't married to establish legal paternity. (Name): We are acknowledging receipt of your application on (date of receipt).