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. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience.Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. Use a formal business format for the actual letter itself. Notify your manager in person before you submit your formal resignation letter. It must include the current date, the last day of employment, notification of resignation, and a formal sign-off. The form may be mailed to P.O. Box 13697, Austin, Texas. I want to assure you of my gratitude for a rewarding professional association during my tenure with ABC Company.