Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. 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. Looking to resign from your job? Learn how to write a professional and respectful two weeks' notice email with our helpful templates and tips. In this article, we discuss why you should send a board resignation letter and the steps you can take to write one. We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company. "Learn the essential steps and tips for writing a professional two weeks notice resignation letter. "The format in which you formally resign will vary from company to company. A resignation letter is a form that gives notice to an entity or organization of an employee's intent to quit their job.