This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. Use this resignation letter example to inform your employer that you need to resign immediately and will not be able to give two weeks' notice.Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. This article will guide you through creating an effective notice letter, helping you leave on good terms and with confidence. I wish the board and the company continued success and offer my support in ensuring a smooth transition. Sincerely,. My resignation is effective immediately. Use a business letter format: Since an Immediate Resignation Letter is formal, you need to use official business formatting.