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. Learn how to write an employee appreciation letter with these templates and examples.Download the template for free (PDF or Word). Learn how to use an effective letter of appreciation to show your gratitude for job opportunities, job search referrals, and other kindnesses. A thankyou letter is a typed or written note that expresses your words of gratitude to somebody for some reason. Your hard work is showing in the high quality of your output. We appreciate all you do! A thankyou letter provides an excellent opportunity to show gratitude for someone's time and effort. They also present you, the sender, in a positive light. Davis Staffing, a leading staffing agency in Chicago, provides four tips on how best to say "thank you" after a job interview.