How to write a resignation letter that's effective immediately? How to Write an Immediate Letter of Resignation?Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). Company Name Address Dear Sir, I, hereby, tender my resignation from the post of Sales Representative of the firm with immediate effect. I am writing to inform you that I will be resigning from my current position, X at X, effective immediately. Please accept this letter as formal notice.