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.Please accept this letter as a notice of my resignation. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. Looking to resign with a 24 Hours Notice Resignation Letter? Use our resignation letter template for notice-period roles. How to Write an Immediate Letter of Resignation? How to write a resignation letter that's effective immediately? Sample resignation letter.