An employee appreciation or thank you letter is a formal message from an employer that recognizes the former's contribution to the company they work for. I'm writing to express my thanks for your prompt and resourceful handling of my financial issues.42 customer thank you card ideas to show your appreciation. Thank you for all that you do. You and your team's incredible work has made a huge difference to our life's and I am extremely grateful. A simple letter of appreciation to a great member of your staff for their efforts will help them feel encouraged and motivate them to keep putting in hard work. Be brief, warm, and sincere. Postcards may be used for short notes. Operation Gratitude proudly partners with volunteers and donors to provide care packages to say thank you to all who serve. Dear Hiring Manager,.