It's a short, formal, and friendly letter that announces you're leaving the company and your current role. We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company.Please accept this message as my formal notice of resignation. I am fortunate to have received a long awaited opportunity that I cannot pass up. The Resignation of Officer letter takes just a few minutes to complete, and gives you the chance to explain why you're leaving - or not. Leaving a job isn't easy.