Add contact details, company name, and date. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips.Dear (Supervisor's Name),. Craft a concise, professional resignation letter. Learn how to gracefully communicate your departure without oversharing details. A resignation letter is a written notice to your employer stating your intent to resign. Your resignation email's subject line should say your name and that you're resigning. You've finally decided to take the plunge and resign from your current job. Congrats! A resignation letter is a formal written notice stating your intention to leave your job. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience.