Learn how to write effective fundraising letters that inspire more support from donors. Explore best practices and templates in this comprehensive guide.Donation Form: Complete the online donation form here. This form lets us know when you are ready send us your letters. Thank you in advance for your understanding and cooperation. We look forward to learning more about your non-profit's fundraising goals. Operation Gratitude sends thousands of handwritten letters of appreciation, love and support to military and frontline responders. Please have your credit card ready when you call. Fill out our secure online donation form. Mail a check to: North Texas Food Bank PO Box 676204.