I can confirm that we have received your email, and I wanted to acknowledge receipt. Thank you for sending me the (invoice, report, etc.).Explore the importance of acknowledgment letters in professional communication. Use our free template to acknowledge the receipt of emails, calls, or letters. Sign and print your name below on this acknowledgement sheet. Received by: Signature. Date. What do you need to include in your donation acknowledgment letter? File your complaint. This is the preferred method of filing. The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes.