Below you'll find a sample resignation letter informing the employer that the employee is resigning due to a new job opportunity. Formal Resignation Letter Sample.I am writing to formally notify you of my resignation from my position at PQR. Use an attractive header with your personal contact info, include the recipient's name, company and address, and include the date. I want to thank you for providing me with this opportunity three years ago. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters.