How to write a resignation letter that's effective immediately? 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. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). You'll receive a letter from the Office of. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. What is a No Notice Resignation Letter?