Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. How to write a resignation letter that's effective immediately?Download Pennsylvania Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Dear (HR Manager's Name),. Start with a formal greeting: Address your letter to your immediate supervisor or manager. What is a No Notice Resignation Letter? Please accept this letter as my formal resignation. Today will be my last day of work. It may be in your contract you have to give a certain time of notice, so you should check it out.