How to write a resignation letter that's effective immediately? 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.Use a one week notice letter template to inform your current employer that you plan to resign within seven days. How to Write an Immediate Letter of Resignation (4 steps). I apologize for the short notice. I've enjoyed working on the customer service team and have learned much during my tenure with the company. Bro just hand a basic resignation letter in and tell your direct line manager what you think of him. They don't care neither should you. Discover Pinterest's best ideas and inspiration for Short notice resignation letter. Get inspired and try out new things.