Download Pennsylvania Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. How to write a resignation letter that's effective immediately?Dear (HR Manager's Name),. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. The amount of notice you should give before leaving your job depends on your employment contract, company policy, and the industry you work in. In this article, we describe how to write a sales resignation letter and provide a template and example to simplify your resignation process. Please accept this letter as my formal resignation. Today will be my last day of work. You should never sign a resignation letter under duress. (For example, "I regret to inform you that I will be resigning from my position, effective immediately.