This document provides guidelines for writing an acknowledgement letter. An acknowledgement letter recognizes someone's efforts or contributions.In his letter acknowledging my congratulations on his appointment he expressed the fear that I might think up some defence. Times, Sunday Times. (2011). We'll show you how with 5 acknowledgment email reply samples and a completely customizable template. An application acknowledgment letter is a business letter that employers may send to job candidates to inform them of the status of their job application. Explore the importance of acknowledgment letters in professional communication. Use our free template to acknowledge the receipt of emails, calls, or letters. Acknowledgment Letter. The manual is available in portable document format (PDF) as a complete book and as individual sections and handbooks.