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?Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Dear (HR Manager's Name),. If you were fired, don't sign a resignation letter. When resigning without notice, your letter should state clearly that the resignation will be effective immediately. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. You should never sign a resignation letter under duress. Although an immediate resignation usually puts employers in a bind, they typically accept these forms of resignation.