How to write a resignation letter that's effective immediately? Create an Immediate Resignation Letter without a notice period using our free printable templates.Resign with a professionally designed document. I'm sorry to leave without notice. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. Resignation Letter No Notice. Customize any of these resignation letters in minutes using our free AI-powered resignation letter builder.. The contact data of the employee, such as cell phone number, address, email address, full legal name. Unless you have an employment contract that requires that the company give you 30 days notice, then no. My resignation is effective immediately.