Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Please accept this letter as a notice of my resignation.How to write a resignation letter that's effective immediately? Your resignation letter should be brief and to the point. You don't need to include lengthy explanations about why you are resigning. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Resignation letters are professional courtesies that extend your professionalism, even in the last days of current employment. What is a No Notice Resignation Letter? Retirement or resignation from the district.