In the upper left-hand corner, write the employee's first and last name, their address, city, state, zip code, phone number and email. 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.Your hard work, expertise, and ability to overcome challenges were instrumental in its success. Thank you for your dedication to excellence. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). Virtual Backgrounds. Follow CalHR's social media web pages for monthly posts and prompts to promote employee engagement. Your employees work hard. Use our employee appreciation letter templates to thank your employees for their effort.