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.Use an attractive header with your personal contact info, include the recipient's name, company and address, and include the date. The best time to resign is at the end of the day, and on a Monday or Tuesday. The end of the day timing is for your benefit. Get tips on how to leave your company the right way. Sales Recruiters Chicago discusses the proper way to resign from a job. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. Below you'll find a sample resignation letter informing the employer that the employee is resigning due to a new job opportunity. Fill in the blanks and you'll be able to bid adieu to your current job in a way that's nothing but professional, polished, and respectful.