This document provides guidelines for writing an acknowledgement letter. An acknowledgement letter recognizes someone's efforts or contributions.A letter that you receive from someone, telling you that something you have sent to them has arrived. Explore the importance of acknowledgment letters in professional communication. Use our free template to acknowledge the receipt of emails, calls, or letters. We have to acknowledge that something is wrong with the system. Belatedly, the government has acknowledged the problem. We highly recommend that you complete your FAFSA no later than May 1st for the fall semester and no later than October 1st for the spring semester. Use a Microsoft Word letter template. Populate your acknowledgment letter template with LGL gift acknowledgment merge fields.