Mail Resignation Letter Template is a written notice of intention to leave a job. How to write a resignation letter that's effective immediately?I am writing this letter to inform you of my decision to resign as a Board member of Center for Kids Ltd. , effective immediately. Use one of our resignation letter templates. Looking to resign with a 24 Hours Notice Resignation Letter? Use our resignation letter template for notice-period roles. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. Please consider this letter as my formal notice of resignation, effective as of January 1, 2051.