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). Your employees work hard. Use our employee appreciation letter templates to thank your employees for their effort. 5 Employee appreciation letter best practices 1) Be timely. San Bernardino County Employees' Summer Picnic brought together nearly 10000 people from 42 departments for an unforgettable day of fun. Write a formal thank you letter to employees for excellent job with appreciation letter for good performance. Example template for job well done letter. The Department of Children and Family Services is seeking an Assistant Director who will assist with administering the operations of the department.