You want to give at least a two weeks' notice. I need to prioritize my health, so I am resigning immediately." Expression of gratitude. Start with the facts and be direct. Please accept this letter as notification that I am resigning from my position with ABCD Company on September 15. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Looking to resign with a Resignation Letter No Notice? Use our resignation letter template for notice-period roles. 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.