How to write a resignation letter that's effective immediately? Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template.In this article, we explain what a resignation letter is, why they're important, provide steps for writing it, and give you a template and examples. In this article, we cover everything you need to know about writing a resignation letter without notice and provide an example to get you started. I am writing to formally resign from my position as a Marketing intern at Green Leaf Energy. I have thoroughly enjoyed my time at the company. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). I am writing to announce my resignation, effective in 24 hours.