It's time to quit the job, and you're not giving two weeks' notice. Here's how to politely write a resignation letter, effective immediately.Resignation letter example. There's no need to sugarcoat or get creative initially; just state the position you're resigning from and the effective date. The letter should be a factual statement of departure, without emotion, anger, threats, or reasons for leaving. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. Explore readymade resignation letter templates tailored for different situations, learn about its essential components, and do and don'ts. The answer is it is legal. There is no law that prohibits them from not hiring you in the future because you quit. The best reason to give, i have found, is something along the lines of, “Thank you very much for giving me this opportunity.