In this article, we discuss what to include in a professional resignation letter and we share examples of resignation letters you can use for reference. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples.Below is a sample union resignation letter. You should check your union's constitution and bylaws to see if it is specific to whom a resignation must be sent. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. Basic Resignation Letter Sample. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. My resignation is effective immediately. A thank you to your employer Thank your employer for the opportunity to work with them. A written resignation is a formal notice to your department and the University that you are ending your employment relationship with the University.