How to write a resignation letter that's effective immediately? Example 1: This is to notify you that I would like to resign from my position as (your post) effective immediately from tomorrow.This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. Use one of our resignation letter templates. I am writing to inform you about my immediate resignation from your company. (For example, "I regret to inform you that I will be resigning from my position, effective immediately.